X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=bip39-standalone.html;h=8c2c6a4ed4b21f80a215f85965bad5b503fed824;hb=f128bd58c49a64e2f9232c6cdd9dd7c3cf815b64;hp=d3a8d339f6f7ae3bbfb570b0f617a9320edea910;hpb=f1e5d48491562ae58926467da4e4c4b81b62a0f3;p=perso%2FImmae%2FProjets%2FCryptomonnaies%2FBIP39.git

diff --git a/bip39-standalone.html b/bip39-standalone.html
index d3a8d33..8c2c6a4 100644
--- a/bip39-standalone.html
+++ b/bip39-standalone.html
@@ -118,7 +118,7 @@
         <div class="container">
 
             <h1 class="text-center">Mnemonic Code Converter</h1>
-            <p class="version">v0.1.1</p>
+            <p class="version">v0.2.2</p>
             <hr>
             <div class="row">
                 <div class="col-md-12">
@@ -280,11 +280,14 @@
                 <div class="col-md-12">
                     <h2>Derivation Path</h2>
                     <ul class="derivation-type nav nav-tabs" role="tablist">
+                        <li id="bip32-tab">
+                            <a href="#bip32" role="tab" data-toggle="tab">BIP32</a>
+                        </li>
                         <li id="bip44-tab" class="active">
                             <a href="#bip44" role="tab" data-toggle="tab">BIP44</a>
                         </li>
-                        <li id="bip32-tab">
-                            <a href="#bip32" role="tab" data-toggle="tab">BIP32</a>
+                        <li id="bip49-tab">
+                            <a href="#bip49" role="tab" data-toggle="tab">BIP49</a>
                         </li>
                     </ul>
                     <div class="derivation-type tab-content">
@@ -303,7 +306,7 @@
                                         <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#purpose" target="_blank" data-translate>Purpose</a>
                                     </label>
                                     <div class="col-sm-10">
-                                        <input id="purpose" type="text" class="purpose form-control" value="44">
+                                        <input id="purpose" type="text" class="purpose form-control" value="44" readonly>
                                     </div>
                                 </div>
                                 <div class="form-group">
@@ -311,7 +314,7 @@
                                         <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#registered-coin-types" target="_blank" data-translate>Coin</a>
                                     </label>
                                     <div class="col-sm-10">
-                                        <input id="coin" type="text" class="coin form-control" value="0">
+                                        <input id="coin" type="text" class="coin form-control" value="0" readonly>
                                     </div>
                                 </div>
                                 <div class="form-group">
@@ -439,6 +442,96 @@
                                 </div>
                             </form>
                         </div>
+                        <div id="bip49" class="tab-pane">
+                            <form class="form-horizontal" role="form">
+                                <br>
+                                <div class="unavailable hidden">
+                                    <div class="form-group">
+                                        <div class="col-sm-2"></div>
+                                        <div class="col-sm-10">
+                                            <p data-translate>BIP49 is unavailable for this coin.</p>
+                                        </div>
+                                    </div>
+                                </div>
+                                <div class="available">
+                                    <div class="col-sm-2"></div>
+                                    <div class="col-sm-10">
+                                        <p data-translate-html>
+                                            For more info see the
+                                            <a href="https://github.com/bitcoin/bips/blob/master/bip-0049.mediawiki" target="_blank">BIP49 spec</a>.
+                                        </p>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="purpose" class="col-sm-2 control-label">
+                                            <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#purpose" target="_blank" data-translate>Purpose</a>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <input id="purpose" type="text" class="purpose form-control" value="49" readonly>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="coin" class="col-sm-2 control-label">
+                                            <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#registered-coin-types" target="_blank" data-translate>Coin</a>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <input id="coin" type="text" class="coin form-control" value="0" readonly>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="account" class="col-sm-2 control-label">
+                                            <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#account" target="_blank" data-translate>Account</a>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <input id="account" type="text" class="account form-control" value="0">
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="change" class="col-sm-2 control-label">
+                                            <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#change" target="_blank" data-translate>External / Internal</a>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <input id="change" type="text" class="change form-control" value="0">
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label class="col-sm-2 control-label">
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <p data-translate>The account extended keys can be used for importing to most BIP49 compatible wallets.</p>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="account-xprv" class="col-sm-2 control-label">
+                                            <span data-translate>Account Extended Private Key</span>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <textarea id="account-xprv" type="text" class="account-xprv form-control" readonly data-show-qr></textarea>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="account-xpub" class="col-sm-2 control-label">
+                                            <span data-translate>Account Extended Public Key</span>
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <textarea id="account-xpub" type="text" class="account-xpub form-control" readonly data-show-qr></textarea>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label class="col-sm-2 control-label">
+                                        </label>
+                                        <div class="col-sm-10">
+                                            <p data-translate>The BIP32 derivation path and extended keys are the basis for the derived addresses.</p>
+                                        </div>
+                                    </div>
+                                    <div class="form-group">
+                                        <label for="bip49-path" class="col-sm-2 control-label" data-translate>BIP32 Derivation Path</label>
+                                        <div class="col-sm-10">
+                                            <input id="bip49-path" type="text" class="path form-control" value="m/49'/0'/0'/0" readonly="readonly">
+                                        </div>
+                                    </div>
+                                </div>
+                            </form>
+                        </div>
                     </div>
                     <form class="form-horizontal" role="form">
                         <div class="form-group">
@@ -7182,2820 +7275,1630 @@ correctLevel:2,background:"#ffffff",foreground:"#000000"},h);return this.each(fu
 j=Math.ceil((f+1)*b)-Math.floor(f*b);d.fillRect(Math.round(i*b),Math.round(f*e),g,j)}}else{a=new o(h.typeNumber,h.correctLevel);a.addData(h.text);a.make();c=r("<table></table>").css("width",h.width+"px").css("height",h.height+"px").css("border","0px").css("border-collapse","collapse").css("background-color",h.background);d=h.width/a.getModuleCount();b=h.height/a.getModuleCount();for(e=0;e<a.getModuleCount();e++){f=r("<tr></tr>").css("height",b+"px").appendTo(c);for(i=0;i<a.getModuleCount();i++)r("<td></td>").css("width",
 d+"px").css("background-color",a.isDark(e,i)?h.foreground:h.background).appendTo(f)}}a=c;$(a).appendTo(this)})}})($);
 </script>
-        <script>(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.bitcoin = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
-// (public) Constructor
-function BigInteger(a, b, c) {
-  if (!(this instanceof BigInteger))
-    return new BigInteger(a, b, c)
-
-  if (a != null) {
-    if ("number" == typeof a) this.fromNumber(a, b, c)
-    else if (b == null && "string" != typeof a) this.fromString(a, 256)
-    else this.fromString(a, b)
-  }
-}
+        <script>(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.bitcoinjs = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+(function (global){
+'use strict';
 
-var proto = BigInteger.prototype
+// compare and isBuffer taken from https://github.com/feross/buffer/blob/680e9e5e488f22aac27599a57dc844a6315928dd/index.js
+// original notice:
 
-// duck-typed isBigInteger
-proto.__bigi = require('../package.json').version
-BigInteger.isBigInteger = function (obj, check_ver) {
-  return obj && obj.__bigi && (!check_ver || obj.__bigi === proto.__bigi)
-}
+/*!
+ * The buffer module from node.js, for the browser.
+ *
+ * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
+ * @license  MIT
+ */
+function compare(a, b) {
+  if (a === b) {
+    return 0;
+  }
 
-// Bits per digit
-var dbits
+  var x = a.length;
+  var y = b.length;
 
-// am: Compute w_j += (x*this_i), propagate carries,
-// c is initial carry, returns final carry.
-// c < 3*dvalue, x < 2*dvalue, this_i < dvalue
-// We need to select the fastest one that works in this environment.
+  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
+    if (a[i] !== b[i]) {
+      x = a[i];
+      y = b[i];
+      break;
+    }
+  }
 
-// am1: use a single mult and divide to get the high bits,
-// max digit bits should be 26 because
-// max internal value = 2*dvalue^2-2*dvalue (< 2^53)
-function am1(i, x, w, j, c, n) {
-  while (--n >= 0) {
-    var v = x * this[i++] + w[j] + c
-    c = Math.floor(v / 0x4000000)
-    w[j++] = v & 0x3ffffff
+  if (x < y) {
+    return -1;
   }
-  return c
-}
-// am2 avoids a big mult-and-extract completely.
-// Max digit bits should be <= 30 because we do bitwise ops
-// on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)
-function am2(i, x, w, j, c, n) {
-  var xl = x & 0x7fff,
-    xh = x >> 15
-  while (--n >= 0) {
-    var l = this[i] & 0x7fff
-    var h = this[i++] >> 15
-    var m = xh * l + h * xl
-    l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff)
-    c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30)
-    w[j++] = l & 0x3fffffff
+  if (y < x) {
+    return 1;
   }
-  return c
+  return 0;
 }
-// Alternately, set max digit bits to 28 since some
-// browsers slow down when dealing with 32-bit numbers.
-function am3(i, x, w, j, c, n) {
-  var xl = x & 0x3fff,
-    xh = x >> 14
-  while (--n >= 0) {
-    var l = this[i] & 0x3fff
-    var h = this[i++] >> 14
-    var m = xh * l + h * xl
-    l = xl * l + ((m & 0x3fff) << 14) + w[j] + c
-    c = (l >> 28) + (m >> 14) + xh * h
-    w[j++] = l & 0xfffffff
+function isBuffer(b) {
+  if (global.Buffer && typeof global.Buffer.isBuffer === 'function') {
+    return global.Buffer.isBuffer(b);
   }
-  return c
+  return !!(b != null && b._isBuffer);
 }
 
-// wtf?
-BigInteger.prototype.am = am1
-dbits = 26
-
-BigInteger.prototype.DB = dbits
-BigInteger.prototype.DM = ((1 << dbits) - 1)
-var DV = BigInteger.prototype.DV = (1 << dbits)
-
-var BI_FP = 52
-BigInteger.prototype.FV = Math.pow(2, BI_FP)
-BigInteger.prototype.F1 = BI_FP - dbits
-BigInteger.prototype.F2 = 2 * dbits - BI_FP
+// based on node assert, original notice:
 
-// Digit conversions
-var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz"
-var BI_RC = new Array()
-var rr, vv
-rr = "0".charCodeAt(0)
-for (vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv
-rr = "a".charCodeAt(0)
-for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv
-rr = "A".charCodeAt(0)
-for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv
+// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
+//
+// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
+//
+// Originally from narwhal.js (http://narwhaljs.org)
+// Copyright (c) 2009 Thomas Robinson <280north.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the 'Software'), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-function int2char(n) {
-  return BI_RM.charAt(n)
+var util = require('util/');
+var hasOwn = Object.prototype.hasOwnProperty;
+var pSlice = Array.prototype.slice;
+var functionsHaveNames = (function () {
+  return function foo() {}.name === 'foo';
+}());
+function pToString (obj) {
+  return Object.prototype.toString.call(obj);
 }
-
-function intAt(s, i) {
-  var c = BI_RC[s.charCodeAt(i)]
-  return (c == null) ? -1 : c
+function isView(arrbuf) {
+  if (isBuffer(arrbuf)) {
+    return false;
+  }
+  if (typeof global.ArrayBuffer !== 'function') {
+    return false;
+  }
+  if (typeof ArrayBuffer.isView === 'function') {
+    return ArrayBuffer.isView(arrbuf);
+  }
+  if (!arrbuf) {
+    return false;
+  }
+  if (arrbuf instanceof DataView) {
+    return true;
+  }
+  if (arrbuf.buffer && arrbuf.buffer instanceof ArrayBuffer) {
+    return true;
+  }
+  return false;
 }
+// 1. The assert module provides functions that throw
+// AssertionError's when particular conditions are not met. The
+// assert module must conform to the following interface.
 
-// (protected) copy this to r
-function bnpCopyTo(r) {
-  for (var i = this.t - 1; i >= 0; --i) r[i] = this[i]
-  r.t = this.t
-  r.s = this.s
-}
+var assert = module.exports = ok;
 
-// (protected) set from integer value x, -DV <= x < DV
-function bnpFromInt(x) {
-  this.t = 1
-  this.s = (x < 0) ? -1 : 0
-  if (x > 0) this[0] = x
-  else if (x < -1) this[0] = x + DV
-  else this.t = 0
-}
+// 2. The AssertionError is defined in assert.
+// new assert.AssertionError({ message: message,
+//                             actual: actual,
+//                             expected: expected })
 
-// return bigint initialized to value
-function nbv(i) {
-  var r = new BigInteger()
-  r.fromInt(i)
-  return r
+var regex = /\s*function\s+([^\(\s]*)\s*/;
+// based on https://github.com/ljharb/function.prototype.name/blob/adeeeec8bfcc6068b187d7d9fb3d5bb1d3a30899/implementation.js
+function getName(func) {
+  if (!util.isFunction(func)) {
+    return;
+  }
+  if (functionsHaveNames) {
+    return func.name;
+  }
+  var str = func.toString();
+  var match = str.match(regex);
+  return match && match[1];
 }
+assert.AssertionError = function AssertionError(options) {
+  this.name = 'AssertionError';
+  this.actual = options.actual;
+  this.expected = options.expected;
+  this.operator = options.operator;
+  if (options.message) {
+    this.message = options.message;
+    this.generatedMessage = false;
+  } else {
+    this.message = getMessage(this);
+    this.generatedMessage = true;
+  }
+  var stackStartFunction = options.stackStartFunction || fail;
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this, stackStartFunction);
+  } else {
+    // non v8 browsers so we can have a stacktrace
+    var err = new Error();
+    if (err.stack) {
+      var out = err.stack;
 
-// (protected) set from string and radix
-function bnpFromString(s, b) {
-  var self = this
+      // try to strip useless frames
+      var fn_name = getName(stackStartFunction);
+      var idx = out.indexOf('\n' + fn_name);
+      if (idx >= 0) {
+        // once we have located the function frame
+        // we need to strip out everything before it (and its line)
+        var next_line = out.indexOf('\n', idx + 1);
+        out = out.substring(next_line + 1);
+      }
 
-  var k
-  if (b == 16) k = 4
-  else if (b == 8) k = 3
-  else if (b == 256) k = 8; // byte array
-  else if (b == 2) k = 1
-  else if (b == 32) k = 5
-  else if (b == 4) k = 2
-  else {
-    self.fromRadix(s, b)
-    return
-  }
-  self.t = 0
-  self.s = 0
-  var i = s.length,
-    mi = false,
-    sh = 0
-  while (--i >= 0) {
-    var x = (k == 8) ? s[i] & 0xff : intAt(s, i)
-    if (x < 0) {
-      if (s.charAt(i) == "-") mi = true
-      continue
+      this.stack = out;
     }
-    mi = false
-    if (sh == 0)
-      self[self.t++] = x
-    else if (sh + k > self.DB) {
-      self[self.t - 1] |= (x & ((1 << (self.DB - sh)) - 1)) << sh
-      self[self.t++] = (x >> (self.DB - sh))
-    } else
-      self[self.t - 1] |= x << sh
-    sh += k
-    if (sh >= self.DB) sh -= self.DB
-  }
-  if (k == 8 && (s[0] & 0x80) != 0) {
-    self.s = -1
-    if (sh > 0) self[self.t - 1] |= ((1 << (self.DB - sh)) - 1) << sh
   }
-  self.clamp()
-  if (mi) BigInteger.ZERO.subTo(self, self)
-}
+};
 
-// (protected) clamp off excess high words
-function bnpClamp() {
-  var c = this.s & this.DM
-  while (this.t > 0 && this[this.t - 1] == c)--this.t
-}
+// assert.AssertionError instanceof Error
+util.inherits(assert.AssertionError, Error);
 
-// (public) return string representation in given radix
-function bnToString(b) {
-  var self = this
-  if (self.s < 0) return "-" + self.negate()
-    .toString(b)
-  var k
-  if (b == 16) k = 4
-  else if (b == 8) k = 3
-  else if (b == 2) k = 1
-  else if (b == 32) k = 5
-  else if (b == 4) k = 2
-  else return self.toRadix(b)
-  var km = (1 << k) - 1,
-    d, m = false,
-    r = "",
-    i = self.t
-  var p = self.DB - (i * self.DB) % k
-  if (i-- > 0) {
-    if (p < self.DB && (d = self[i] >> p) > 0) {
-      m = true
-      r = int2char(d)
-    }
-    while (i >= 0) {
-      if (p < k) {
-        d = (self[i] & ((1 << p) - 1)) << (k - p)
-        d |= self[--i] >> (p += self.DB - k)
-      } else {
-        d = (self[i] >> (p -= k)) & km
-        if (p <= 0) {
-          p += self.DB
-          --i
-        }
-      }
-      if (d > 0) m = true
-      if (m) r += int2char(d)
-    }
+function truncate(s, n) {
+  if (typeof s === 'string') {
+    return s.length < n ? s : s.slice(0, n);
+  } else {
+    return s;
   }
-  return m ? r : "0"
 }
-
-// (public) -this
-function bnNegate() {
-  var r = new BigInteger()
-  BigInteger.ZERO.subTo(this, r)
-  return r
+function inspect(something) {
+  if (functionsHaveNames || !util.isFunction(something)) {
+    return util.inspect(something);
+  }
+  var rawname = getName(something);
+  var name = rawname ? ': ' + rawname : '';
+  return '[Function' +  name + ']';
 }
-
-// (public) |this|
-function bnAbs() {
-  return (this.s < 0) ? this.negate() : this
+function getMessage(self) {
+  return truncate(inspect(self.actual), 128) + ' ' +
+         self.operator + ' ' +
+         truncate(inspect(self.expected), 128);
 }
 
-// (public) return + if this > a, - if this < a, 0 if equal
-function bnCompareTo(a) {
-  var r = this.s - a.s
-  if (r != 0) return r
-  var i = this.t
-  r = i - a.t
-  if (r != 0) return (this.s < 0) ? -r : r
-  while (--i >= 0)
-    if ((r = this[i] - a[i]) != 0) return r
-  return 0
-}
+// At present only the three keys mentioned above are used and
+// understood by the spec. Implementations or sub modules can pass
+// other keys to the AssertionError's constructor - they will be
+// ignored.
 
-// returns bit length of the integer x
-function nbits(x) {
-  var r = 1,
-    t
-  if ((t = x >>> 16) != 0) {
-    x = t
-    r += 16
-  }
-  if ((t = x >> 8) != 0) {
-    x = t
-    r += 8
-  }
-  if ((t = x >> 4) != 0) {
-    x = t
-    r += 4
-  }
-  if ((t = x >> 2) != 0) {
-    x = t
-    r += 2
-  }
-  if ((t = x >> 1) != 0) {
-    x = t
-    r += 1
-  }
-  return r
-}
+// 3. All of the following functions must throw an AssertionError
+// when a corresponding condition is not met, with a message that
+// may be undefined if not provided.  All assertion methods provide
+// both the actual and expected values to the assertion error for
+// display purposes.
 
-// (public) return the number of bits in "this"
-function bnBitLength() {
-  if (this.t <= 0) return 0
-  return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ (this.s & this.DM))
+function fail(actual, expected, message, operator, stackStartFunction) {
+  throw new assert.AssertionError({
+    message: message,
+    actual: actual,
+    expected: expected,
+    operator: operator,
+    stackStartFunction: stackStartFunction
+  });
 }
 
-// (public) return the number of bytes in "this"
-function bnByteLength() {
-  return this.bitLength() >> 3
-}
+// EXTENSION! allows for well behaved errors defined elsewhere.
+assert.fail = fail;
 
-// (protected) r = this << n*DB
-function bnpDLShiftTo(n, r) {
-  var i
-  for (i = this.t - 1; i >= 0; --i) r[i + n] = this[i]
-  for (i = n - 1; i >= 0; --i) r[i] = 0
-  r.t = this.t + n
-  r.s = this.s
-}
+// 4. Pure assertion tests whether a value is truthy, as determined
+// by !!guard.
+// assert.ok(guard, message_opt);
+// This statement is equivalent to assert.equal(true, !!guard,
+// message_opt);. To test strictly for the value true, use
+// assert.strictEqual(true, guard, message_opt);.
 
-// (protected) r = this >> n*DB
-function bnpDRShiftTo(n, r) {
-  for (var i = n; i < this.t; ++i) r[i - n] = this[i]
-  r.t = Math.max(this.t - n, 0)
-  r.s = this.s
+function ok(value, message) {
+  if (!value) fail(value, true, message, '==', assert.ok);
 }
+assert.ok = ok;
 
-// (protected) r = this << n
-function bnpLShiftTo(n, r) {
-  var self = this
-  var bs = n % self.DB
-  var cbs = self.DB - bs
-  var bm = (1 << cbs) - 1
-  var ds = Math.floor(n / self.DB),
-    c = (self.s << bs) & self.DM,
-    i
-  for (i = self.t - 1; i >= 0; --i) {
-    r[i + ds + 1] = (self[i] >> cbs) | c
-    c = (self[i] & bm) << bs
+// 5. The equality assertion tests shallow, coercive equality with
+// ==.
+// assert.equal(actual, expected, message_opt);
+
+assert.equal = function equal(actual, expected, message) {
+  if (actual != expected) fail(actual, expected, message, '==', assert.equal);
+};
+
+// 6. The non-equality assertion tests for whether two objects are not equal
+// with != assert.notEqual(actual, expected, message_opt);
+
+assert.notEqual = function notEqual(actual, expected, message) {
+  if (actual == expected) {
+    fail(actual, expected, message, '!=', assert.notEqual);
   }
-  for (i = ds - 1; i >= 0; --i) r[i] = 0
-  r[ds] = c
-  r.t = self.t + ds + 1
-  r.s = self.s
-  r.clamp()
-}
+};
 
-// (protected) r = this >> n
-function bnpRShiftTo(n, r) {
-  var self = this
-  r.s = self.s
-  var ds = Math.floor(n / self.DB)
-  if (ds >= self.t) {
-    r.t = 0
-    return
+// 7. The equivalence assertion tests a deep equality relation.
+// assert.deepEqual(actual, expected, message_opt);
+
+assert.deepEqual = function deepEqual(actual, expected, message) {
+  if (!_deepEqual(actual, expected, false)) {
+    fail(actual, expected, message, 'deepEqual', assert.deepEqual);
   }
-  var bs = n % self.DB
-  var cbs = self.DB - bs
-  var bm = (1 << bs) - 1
-  r[0] = self[ds] >> bs
-  for (var i = ds + 1; i < self.t; ++i) {
-    r[i - ds - 1] |= (self[i] & bm) << cbs
-    r[i - ds] = self[i] >> bs
-  }
-  if (bs > 0) r[self.t - ds - 1] |= (self.s & bm) << cbs
-  r.t = self.t - ds
-  r.clamp()
-}
+};
 
-// (protected) r = this - a
-function bnpSubTo(a, r) {
-  var self = this
-  var i = 0,
-    c = 0,
-    m = Math.min(a.t, self.t)
-  while (i < m) {
-    c += self[i] - a[i]
-    r[i++] = c & self.DM
-    c >>= self.DB
+assert.deepStrictEqual = function deepStrictEqual(actual, expected, message) {
+  if (!_deepEqual(actual, expected, true)) {
+    fail(actual, expected, message, 'deepStrictEqual', assert.deepStrictEqual);
   }
-  if (a.t < self.t) {
-    c -= a.s
-    while (i < self.t) {
-      c += self[i]
-      r[i++] = c & self.DM
-      c >>= self.DB
-    }
-    c += self.s
+};
+
+function _deepEqual(actual, expected, strict, memos) {
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+  } else if (isBuffer(actual) && isBuffer(expected)) {
+    return compare(actual, expected) === 0;
+
+  // 7.2. If the expected value is a Date object, the actual value is
+  // equivalent if it is also a Date object that refers to the same time.
+  } else if (util.isDate(actual) && util.isDate(expected)) {
+    return actual.getTime() === expected.getTime();
+
+  // 7.3 If the expected value is a RegExp object, the actual value is
+  // equivalent if it is also a RegExp object with the same source and
+  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
+  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
+    return actual.source === expected.source &&
+           actual.global === expected.global &&
+           actual.multiline === expected.multiline &&
+           actual.lastIndex === expected.lastIndex &&
+           actual.ignoreCase === expected.ignoreCase;
+
+  // 7.4. Other pairs that do not both pass typeof value == 'object',
+  // equivalence is determined by ==.
+  } else if ((actual === null || typeof actual !== 'object') &&
+             (expected === null || typeof expected !== 'object')) {
+    return strict ? actual === expected : actual == expected;
+
+  // If both values are instances of typed arrays, wrap their underlying
+  // ArrayBuffers in a Buffer each to increase performance
+  // This optimization requires the arrays to have the same type as checked by
+  // Object.prototype.toString (aka pToString). Never perform binary
+  // comparisons for Float*Arrays, though, since e.g. +0 === -0 but their
+  // bit patterns are not identical.
+  } else if (isView(actual) && isView(expected) &&
+             pToString(actual) === pToString(expected) &&
+             !(actual instanceof Float32Array ||
+               actual instanceof Float64Array)) {
+    return compare(new Uint8Array(actual.buffer),
+                   new Uint8Array(expected.buffer)) === 0;
+
+  // 7.5 For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else if (isBuffer(actual) !== isBuffer(expected)) {
+    return false;
   } else {
-    c += self.s
-    while (i < a.t) {
-      c -= a[i]
-      r[i++] = c & self.DM
-      c >>= self.DB
+    memos = memos || {actual: [], expected: []};
+
+    var actualIndex = memos.actual.indexOf(actual);
+    if (actualIndex !== -1) {
+      if (actualIndex === memos.expected.indexOf(expected)) {
+        return true;
+      }
     }
-    c -= a.s
+
+    memos.actual.push(actual);
+    memos.expected.push(expected);
+
+    return objEquiv(actual, expected, strict, memos);
   }
-  r.s = (c < 0) ? -1 : 0
-  if (c < -1) r[i++] = self.DV + c
-  else if (c > 0) r[i++] = c
-  r.t = i
-  r.clamp()
 }
 
-// (protected) r = this * a, r != this,a (HAC 14.12)
-// "this" should be the larger one if appropriate.
-function bnpMultiplyTo(a, r) {
-  var x = this.abs(),
-    y = a.abs()
-  var i = x.t
-  r.t = i + y.t
-  while (--i >= 0) r[i] = 0
-  for (i = 0; i < y.t; ++i) r[i + x.t] = x.am(0, y[i], r, i, 0, x.t)
-  r.s = 0
-  r.clamp()
-  if (this.s != a.s) BigInteger.ZERO.subTo(r, r)
+function isArguments(object) {
+  return Object.prototype.toString.call(object) == '[object Arguments]';
 }
 
-// (protected) r = this^2, r != this (HAC 14.16)
-function bnpSquareTo(r) {
-  var x = this.abs()
-  var i = r.t = 2 * x.t
-  while (--i >= 0) r[i] = 0
-  for (i = 0; i < x.t - 1; ++i) {
-    var c = x.am(i, x[i], r, 2 * i, 0, 1)
-    if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) {
-      r[i + x.t] -= x.DV
-      r[i + x.t + 1] = 1
-    }
+function objEquiv(a, b, strict, actualVisitedObjects) {
+  if (a === null || a === undefined || b === null || b === undefined)
+    return false;
+  // if one is a primitive, the other must be same
+  if (util.isPrimitive(a) || util.isPrimitive(b))
+    return a === b;
+  if (strict && Object.getPrototypeOf(a) !== Object.getPrototypeOf(b))
+    return false;
+  var aIsArgs = isArguments(a);
+  var bIsArgs = isArguments(b);
+  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
+    return false;
+  if (aIsArgs) {
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return _deepEqual(a, b, strict);
   }
-  if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1)
-  r.s = 0
-  r.clamp()
+  var ka = objectKeys(a);
+  var kb = objectKeys(b);
+  var key, i;
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length !== kb.length)
+    return false;
+  //the same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  //~~~cheap key test
+  for (i = ka.length - 1; i >= 0; i--) {
+    if (ka[i] !== kb[i])
+      return false;
+  }
+  //equivalent values for every corresponding key, and
+  //~~~possibly expensive deep test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!_deepEqual(a[key], b[key], strict, actualVisitedObjects))
+      return false;
+  }
+  return true;
 }
 
-// (protected) divide this by m, quotient and remainder to q, r (HAC 14.20)
-// r != q, this != m.  q or r may be null.
-function bnpDivRemTo(m, q, r) {
-  var self = this
-  var pm = m.abs()
-  if (pm.t <= 0) return
-  var pt = self.abs()
-  if (pt.t < pm.t) {
-    if (q != null) q.fromInt(0)
-    if (r != null) self.copyTo(r)
-    return
+// 8. The non-equivalence assertion tests for any deep inequality.
+// assert.notDeepEqual(actual, expected, message_opt);
+
+assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
+  if (_deepEqual(actual, expected, false)) {
+    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
   }
-  if (r == null) r = new BigInteger()
-  var y = new BigInteger(),
-    ts = self.s,
-    ms = m.s
-  var nsh = self.DB - nbits(pm[pm.t - 1]); // normalize modulus
-  if (nsh > 0) {
-    pm.lShiftTo(nsh, y)
-    pt.lShiftTo(nsh, r)
-  } else {
-    pm.copyTo(y)
-    pt.copyTo(r)
+};
+
+assert.notDeepStrictEqual = notDeepStrictEqual;
+function notDeepStrictEqual(actual, expected, message) {
+  if (_deepEqual(actual, expected, true)) {
+    fail(actual, expected, message, 'notDeepStrictEqual', notDeepStrictEqual);
   }
-  var ys = y.t
-  var y0 = y[ys - 1]
-  if (y0 == 0) return
-  var yt = y0 * (1 << self.F1) + ((ys > 1) ? y[ys - 2] >> self.F2 : 0)
-  var d1 = self.FV / yt,
-    d2 = (1 << self.F1) / yt,
-    e = 1 << self.F2
-  var i = r.t,
-    j = i - ys,
-    t = (q == null) ? new BigInteger() : q
-  y.dlShiftTo(j, t)
-  if (r.compareTo(t) >= 0) {
-    r[r.t++] = 1
-    r.subTo(t, r)
+}
+
+
+// 9. The strict equality assertion tests strict equality, as determined by ===.
+// assert.strictEqual(actual, expected, message_opt);
+
+assert.strictEqual = function strictEqual(actual, expected, message) {
+  if (actual !== expected) {
+    fail(actual, expected, message, '===', assert.strictEqual);
   }
-  BigInteger.ONE.dlShiftTo(ys, t)
-  t.subTo(y, y); // "negative" y so we can replace sub with am later
-  while (y.t < ys) y[y.t++] = 0
-  while (--j >= 0) {
-    // Estimate quotient digit
-    var qd = (r[--i] == y0) ? self.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2)
-    if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) { // Try it out
-      y.dlShiftTo(j, t)
-      r.subTo(t, r)
-      while (r[i] < --qd) r.subTo(t, r)
+};
+
+// 10. The strict non-equality assertion tests for strict inequality, as
+// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);
+
+assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
+  if (actual === expected) {
+    fail(actual, expected, message, '!==', assert.notStrictEqual);
+  }
+};
+
+function expectedException(actual, expected) {
+  if (!actual || !expected) {
+    return false;
+  }
+
+  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
+    return expected.test(actual);
+  }
+
+  try {
+    if (actual instanceof expected) {
+      return true;
     }
+  } catch (e) {
+    // Ignore.  The instanceof check doesn't work for arrow functions.
   }
-  if (q != null) {
-    r.drShiftTo(ys, q)
-    if (ts != ms) BigInteger.ZERO.subTo(q, q)
+
+  if (Error.isPrototypeOf(expected)) {
+    return false;
   }
-  r.t = ys
-  r.clamp()
-  if (nsh > 0) r.rShiftTo(nsh, r); // Denormalize remainder
-  if (ts < 0) BigInteger.ZERO.subTo(r, r)
-}
 
-// (public) this mod a
-function bnMod(a) {
-  var r = new BigInteger()
-  this.abs()
-    .divRemTo(a, null, r)
-  if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r)
-  return r
+  return expected.call({}, actual) === true;
 }
 
-// Modular reduction using "classic" algorithm
-function Classic(m) {
-  this.m = m
+function _tryBlock(block) {
+  var error;
+  try {
+    block();
+  } catch (e) {
+    error = e;
+  }
+  return error;
 }
 
-function cConvert(x) {
-  if (x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m)
-  else return x
-}
+function _throws(shouldThrow, block, expected, message) {
+  var actual;
 
-function cRevert(x) {
-  return x
-}
+  if (typeof block !== 'function') {
+    throw new TypeError('"block" argument must be a function');
+  }
 
-function cReduce(x) {
-  x.divRemTo(this.m, null, x)
-}
+  if (typeof expected === 'string') {
+    message = expected;
+    expected = null;
+  }
 
-function cMulTo(x, y, r) {
-  x.multiplyTo(y, r)
-  this.reduce(r)
-}
+  actual = _tryBlock(block);
 
-function cSqrTo(x, r) {
-  x.squareTo(r)
-  this.reduce(r)
-}
+  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
+            (message ? ' ' + message : '.');
 
-Classic.prototype.convert = cConvert
-Classic.prototype.revert = cRevert
-Classic.prototype.reduce = cReduce
-Classic.prototype.mulTo = cMulTo
-Classic.prototype.sqrTo = cSqrTo
+  if (shouldThrow && !actual) {
+    fail(actual, expected, 'Missing expected exception' + message);
+  }
 
-// (protected) return "-1/this % 2^DB"; useful for Mont. reduction
-// justification:
-//         xy == 1 (mod m)
-//         xy =  1+km
-//   xy(2-xy) = (1+km)(1-km)
-// x[y(2-xy)] = 1-k^2m^2
-// x[y(2-xy)] == 1 (mod m^2)
-// if y is 1/x mod m, then y(2-xy) is 1/x mod m^2
-// should reduce x and y(2-xy) by m^2 at each step to keep size bounded.
-// JS multiply "overflows" differently from C/C++, so care is needed here.
-function bnpInvDigit() {
-  if (this.t < 1) return 0
-  var x = this[0]
-  if ((x & 1) == 0) return 0
-  var y = x & 3; // y == 1/x mod 2^2
-  y = (y * (2 - (x & 0xf) * y)) & 0xf; // y == 1/x mod 2^4
-  y = (y * (2 - (x & 0xff) * y)) & 0xff; // y == 1/x mod 2^8
-  y = (y * (2 - (((x & 0xffff) * y) & 0xffff))) & 0xffff; // y == 1/x mod 2^16
-  // last step - calculate inverse mod DV directly
-  // assumes 16 < DB <= 32 and assumes ability to handle 48-bit ints
-  y = (y * (2 - x * y % this.DV)) % this.DV; // y == 1/x mod 2^dbits
-  // we really want the negative inverse, and -DV < y < DV
-  return (y > 0) ? this.DV - y : -y
-}
+  var userProvidedMessage = typeof message === 'string';
+  var isUnwantedException = !shouldThrow && util.isError(actual);
+  var isUnexpectedException = !shouldThrow && actual && !expected;
 
-// Montgomery reduction
-function Montgomery(m) {
-  this.m = m
-  this.mp = m.invDigit()
-  this.mpl = this.mp & 0x7fff
-  this.mph = this.mp >> 15
-  this.um = (1 << (m.DB - 15)) - 1
-  this.mt2 = 2 * m.t
-}
+  if ((isUnwantedException &&
+      userProvidedMessage &&
+      expectedException(actual, expected)) ||
+      isUnexpectedException) {
+    fail(actual, expected, 'Got unwanted exception' + message);
+  }
 
-// xR mod m
-function montConvert(x) {
-  var r = new BigInteger()
-  x.abs()
-    .dlShiftTo(this.m.t, r)
-  r.divRemTo(this.m, null, r)
-  if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r)
-  return r
+  if ((shouldThrow && actual && expected &&
+      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
+    throw actual;
+  }
 }
 
-// x/R mod m
-function montRevert(x) {
-  var r = new BigInteger()
-  x.copyTo(r)
-  this.reduce(r)
-  return r
-}
+// 11. Expected to throw an error:
+// assert.throws(block, Error_opt, message_opt);
 
-// x = x/R mod m (HAC 14.32)
-function montReduce(x) {
-  while (x.t <= this.mt2) // pad x so am has enough room later
-    x[x.t++] = 0
-  for (var i = 0; i < this.m.t; ++i) {
-    // faster way of calculating u0 = x[i]*mp mod DV
-    var j = x[i] & 0x7fff
-    var u0 = (j * this.mpl + (((j * this.mph + (x[i] >> 15) * this.mpl) & this.um) << 15)) & x.DM
-    // use am to combine the multiply-shift-add into one call
-    j = i + this.m.t
-    x[j] += this.m.am(0, u0, x, i, 0, this.m.t)
-    // propagate carry
-    while (x[j] >= x.DV) {
-      x[j] -= x.DV
-      x[++j]++
-    }
+assert.throws = function(block, /*optional*/error, /*optional*/message) {
+  _throws(true, block, error, message);
+};
+
+// EXTENSION! This is annoying to write outside this module.
+assert.doesNotThrow = function(block, /*optional*/error, /*optional*/message) {
+  _throws(false, block, error, message);
+};
+
+assert.ifError = function(err) { if (err) throw err; };
+
+var objectKeys = Object.keys || function (obj) {
+  var keys = [];
+  for (var key in obj) {
+    if (hasOwn.call(obj, key)) keys.push(key);
   }
-  x.clamp()
-  x.drShiftTo(this.m.t, x)
-  if (x.compareTo(this.m) >= 0) x.subTo(this.m, x)
-}
+  return keys;
+};
 
-// r = "x^2/R mod m"; x != r
-function montSqrTo(x, r) {
-  x.squareTo(r)
-  this.reduce(r)
-}
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"util/":32}],2:[function(require,module,exports){
+'use strict'
 
-// r = "xy/R mod m"; x,y != r
-function montMulTo(x, y, r) {
-  x.multiplyTo(y, r)
-  this.reduce(r)
-}
+exports.byteLength = byteLength
+exports.toByteArray = toByteArray
+exports.fromByteArray = fromByteArray
 
-Montgomery.prototype.convert = montConvert
-Montgomery.prototype.revert = montRevert
-Montgomery.prototype.reduce = montReduce
-Montgomery.prototype.mulTo = montMulTo
-Montgomery.prototype.sqrTo = montSqrTo
+var lookup = []
+var revLookup = []
+var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
 
-// (protected) true iff this is even
-function bnpIsEven() {
-  return ((this.t > 0) ? (this[0] & 1) : this.s) == 0
+var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+for (var i = 0, len = code.length; i < len; ++i) {
+  lookup[i] = code[i]
+  revLookup[code.charCodeAt(i)] = i
 }
 
-// (protected) this^e, e < 2^32, doing sqr and mul with "r" (HAC 14.79)
-function bnpExp(e, z) {
-  if (e > 0xffffffff || e < 1) return BigInteger.ONE
-  var r = new BigInteger(),
-    r2 = new BigInteger(),
-    g = z.convert(this),
-    i = nbits(e) - 1
-  g.copyTo(r)
-  while (--i >= 0) {
-    z.sqrTo(r, r2)
-    if ((e & (1 << i)) > 0) z.mulTo(r2, g, r)
-    else {
-      var t = r
-      r = r2
-      r2 = t
-    }
+revLookup['-'.charCodeAt(0)] = 62
+revLookup['_'.charCodeAt(0)] = 63
+
+function placeHoldersCount (b64) {
+  var len = b64.length
+  if (len % 4 > 0) {
+    throw new Error('Invalid string. Length must be a multiple of 4')
   }
-  return z.revert(r)
+
+  // the number of equal signs (place holders)
+  // if there are two placeholders, than the two characters before it
+  // represent one byte
+  // if there is only one, then the three characters before it represent 2 bytes
+  // this is just a cheap hack to not do indexOf twice
+  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
 }
 
-// (public) this^e % m, 0 <= e < 2^32
-function bnModPowInt(e, m) {
-  var z
-  if (e < 256 || m.isEven()) z = new Classic(m)
-  else z = new Montgomery(m)
-  return this.exp(e, z)
+function byteLength (b64) {
+  // base64 is 4/3 + up to two characters of the original data
+  return (b64.length * 3 / 4) - placeHoldersCount(b64)
 }
 
-// protected
-proto.copyTo = bnpCopyTo
-proto.fromInt = bnpFromInt
-proto.fromString = bnpFromString
-proto.clamp = bnpClamp
-proto.dlShiftTo = bnpDLShiftTo
-proto.drShiftTo = bnpDRShiftTo
-proto.lShiftTo = bnpLShiftTo
-proto.rShiftTo = bnpRShiftTo
-proto.subTo = bnpSubTo
-proto.multiplyTo = bnpMultiplyTo
-proto.squareTo = bnpSquareTo
-proto.divRemTo = bnpDivRemTo
-proto.invDigit = bnpInvDigit
-proto.isEven = bnpIsEven
-proto.exp = bnpExp
+function toByteArray (b64) {
+  var i, l, tmp, placeHolders, arr
+  var len = b64.length
+  placeHolders = placeHoldersCount(b64)
 
-// public
-proto.toString = bnToString
-proto.negate = bnNegate
-proto.abs = bnAbs
-proto.compareTo = bnCompareTo
-proto.bitLength = bnBitLength
-proto.byteLength = bnByteLength
-proto.mod = bnMod
-proto.modPowInt = bnModPowInt
+  arr = new Arr((len * 3 / 4) - placeHolders)
 
-// (public)
-function bnClone() {
-  var r = new BigInteger()
-  this.copyTo(r)
-  return r
-}
+  // if there are placeholders, only get up to the last complete 4 chars
+  l = placeHolders > 0 ? len - 4 : len
 
-// (public) return value as integer
-function bnIntValue() {
-  if (this.s < 0) {
-    if (this.t == 1) return this[0] - this.DV
-    else if (this.t == 0) return -1
-  } else if (this.t == 1) return this[0]
-  else if (this.t == 0) return 0
-  // assumes 16 < DB < 32
-  return ((this[1] & ((1 << (32 - this.DB)) - 1)) << this.DB) | this[0]
-}
+  var L = 0
 
-// (public) return value as byte
-function bnByteValue() {
-  return (this.t == 0) ? this.s : (this[0] << 24) >> 24
-}
+  for (i = 0; i < l; i += 4) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
+    arr[L++] = (tmp >> 16) & 0xFF
+    arr[L++] = (tmp >> 8) & 0xFF
+    arr[L++] = tmp & 0xFF
+  }
 
-// (public) return value as short (assumes DB>=16)
-function bnShortValue() {
-  return (this.t == 0) ? this.s : (this[0] << 16) >> 16
-}
+  if (placeHolders === 2) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
+    arr[L++] = tmp & 0xFF
+  } else if (placeHolders === 1) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
+    arr[L++] = (tmp >> 8) & 0xFF
+    arr[L++] = tmp & 0xFF
+  }
 
-// (protected) return x s.t. r^x < DV
-function bnpChunkSize(r) {
-  return Math.floor(Math.LN2 * this.DB / Math.log(r))
+  return arr
 }
 
-// (public) 0 if this == 0, 1 if this > 0
-function bnSigNum() {
-  if (this.s < 0) return -1
-  else if (this.t <= 0 || (this.t == 1 && this[0] <= 0)) return 0
-  else return 1
+function tripletToBase64 (num) {
+  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
 }
 
-// (protected) convert to radix string
-function bnpToRadix(b) {
-  if (b == null) b = 10
-  if (this.signum() == 0 || b < 2 || b > 36) return "0"
-  var cs = this.chunkSize(b)
-  var a = Math.pow(b, cs)
-  var d = nbv(a),
-    y = new BigInteger(),
-    z = new BigInteger(),
-    r = ""
-  this.divRemTo(d, y, z)
-  while (y.signum() > 0) {
-    r = (a + z.intValue())
-      .toString(b)
-      .substr(1) + r
-    y.divRemTo(d, y, z)
+function encodeChunk (uint8, start, end) {
+  var tmp
+  var output = []
+  for (var i = start; i < end; i += 3) {
+    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
+    output.push(tripletToBase64(tmp))
   }
-  return z.intValue()
-    .toString(b) + r
+  return output.join('')
 }
 
-// (protected) convert from radix string
-function bnpFromRadix(s, b) {
-  var self = this
-  self.fromInt(0)
-  if (b == null) b = 10
-  var cs = self.chunkSize(b)
-  var d = Math.pow(b, cs),
-    mi = false,
-    j = 0,
-    w = 0
-  for (var i = 0; i < s.length; ++i) {
-    var x = intAt(s, i)
-    if (x < 0) {
-      if (s.charAt(i) == "-" && self.signum() == 0) mi = true
-      continue
-    }
-    w = b * w + x
-    if (++j >= cs) {
-      self.dMultiply(d)
-      self.dAddOffset(w, 0)
-      j = 0
-      w = 0
-    }
-  }
-  if (j > 0) {
-    self.dMultiply(Math.pow(b, j))
-    self.dAddOffset(w, 0)
-  }
-  if (mi) BigInteger.ZERO.subTo(self, self)
-}
+function fromByteArray (uint8) {
+  var tmp
+  var len = uint8.length
+  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
+  var output = ''
+  var parts = []
+  var maxChunkLength = 16383 // must be multiple of 3
 
-// (protected) alternate constructor
-function bnpFromNumber(a, b, c) {
-  var self = this
-  if ("number" == typeof b) {
-    // new BigInteger(int,int,RNG)
-    if (a < 2) self.fromInt(1)
-    else {
-      self.fromNumber(a, c)
-      if (!self.testBit(a - 1)) // force MSB set
-        self.bitwiseTo(BigInteger.ONE.shiftLeft(a - 1), op_or, self)
-      if (self.isEven()) self.dAddOffset(1, 0); // force odd
-      while (!self.isProbablePrime(b)) {
-        self.dAddOffset(2, 0)
-        if (self.bitLength() > a) self.subTo(BigInteger.ONE.shiftLeft(a - 1), self)
-      }
-    }
-  } else {
-    // new BigInteger(int,RNG)
-    var x = new Array(),
-      t = a & 7
-    x.length = (a >> 3) + 1
-    b.nextBytes(x)
-    if (t > 0) x[0] &= ((1 << t) - 1)
-    else x[0] = 0
-    self.fromString(x, 256)
+  // go through the array every three bytes, we'll deal with trailing stuff later
+  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
   }
-}
 
-// (public) convert to bigendian byte array
-function bnToByteArray() {
-  var self = this
-  var i = self.t,
-    r = new Array()
-  r[0] = self.s
-  var p = self.DB - (i * self.DB) % 8,
-    d, k = 0
-  if (i-- > 0) {
-    if (p < self.DB && (d = self[i] >> p) != (self.s & self.DM) >> p)
-      r[k++] = d | (self.s << (self.DB - p))
-    while (i >= 0) {
-      if (p < 8) {
-        d = (self[i] & ((1 << p) - 1)) << (8 - p)
-        d |= self[--i] >> (p += self.DB - 8)
-      } else {
-        d = (self[i] >> (p -= 8)) & 0xff
-        if (p <= 0) {
-          p += self.DB
-          --i
-        }
-      }
-      if ((d & 0x80) != 0) d |= -256
-      if (k === 0 && (self.s & 0x80) != (d & 0x80))++k
-      if (k > 0 || d != self.s) r[k++] = d
-    }
+  // pad the end with zeros, but make sure to not forget the extra bytes
+  if (extraBytes === 1) {
+    tmp = uint8[len - 1]
+    output += lookup[tmp >> 2]
+    output += lookup[(tmp << 4) & 0x3F]
+    output += '=='
+  } else if (extraBytes === 2) {
+    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
+    output += lookup[tmp >> 10]
+    output += lookup[(tmp >> 4) & 0x3F]
+    output += lookup[(tmp << 2) & 0x3F]
+    output += '='
   }
-  return r
-}
 
-function bnEquals(a) {
-  return (this.compareTo(a) == 0)
-}
+  parts.push(output)
 
-function bnMin(a) {
-  return (this.compareTo(a) < 0) ? this : a
+  return parts.join('')
 }
 
-function bnMax(a) {
-  return (this.compareTo(a) > 0) ? this : a
-}
+},{}],3:[function(require,module,exports){
 
-// (protected) r = this op a (bitwise)
-function bnpBitwiseTo(a, op, r) {
-  var self = this
-  var i, f, m = Math.min(a.t, self.t)
-  for (i = 0; i < m; ++i) r[i] = op(self[i], a[i])
-  if (a.t < self.t) {
-    f = a.s & self.DM
-    for (i = m; i < self.t; ++i) r[i] = op(self[i], f)
-    r.t = self.t
-  } else {
-    f = self.s & self.DM
-    for (i = m; i < a.t; ++i) r[i] = op(f, a[i])
-    r.t = a.t
-  }
-  r.s = op(self.s, a.s)
-  r.clamp()
-}
+},{}],4:[function(require,module,exports){
+/*!
+ * The buffer module from node.js, for the browser.
+ *
+ * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
+ * @license  MIT
+ */
+/* eslint-disable no-proto */
 
-// (public) this & a
-function op_and(x, y) {
-  return x & y
-}
+'use strict'
 
-function bnAnd(a) {
-  var r = new BigInteger()
-  this.bitwiseTo(a, op_and, r)
-  return r
-}
+var base64 = require('base64-js')
+var ieee754 = require('ieee754')
 
-// (public) this | a
-function op_or(x, y) {
-  return x | y
-}
+exports.Buffer = Buffer
+exports.SlowBuffer = SlowBuffer
+exports.INSPECT_MAX_BYTES = 50
 
-function bnOr(a) {
-  var r = new BigInteger()
-  this.bitwiseTo(a, op_or, r)
-  return r
-}
+var K_MAX_LENGTH = 0x7fffffff
+exports.kMaxLength = K_MAX_LENGTH
 
-// (public) this ^ a
-function op_xor(x, y) {
-  return x ^ y
-}
+/**
+ * If `Buffer.TYPED_ARRAY_SUPPORT`:
+ *   === true    Use Uint8Array implementation (fastest)
+ *   === false   Print warning and recommend using `buffer` v4.x which has an Object
+ *               implementation (most compatible, even IE6)
+ *
+ * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
+ * Opera 11.6+, iOS 4.2+.
+ *
+ * We report that the browser does not support typed arrays if the are not subclassable
+ * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
+ * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
+ * for __proto__ and has a buggy typed array implementation.
+ */
+Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
 
-function bnXor(a) {
-  var r = new BigInteger()
-  this.bitwiseTo(a, op_xor, r)
-  return r
+if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
+    typeof console.error === 'function') {
+  console.error(
+    'This browser lacks typed array (Uint8Array) support which is required by ' +
+    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
+  )
 }
 
-// (public) this & ~a
-function op_andnot(x, y) {
-  return x & ~y
+function typedArraySupport () {
+  // Can typed array instances can be augmented?
+  try {
+    var arr = new Uint8Array(1)
+    arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
+    return arr.foo() === 42
+  } catch (e) {
+    return false
+  }
 }
 
-function bnAndNot(a) {
-  var r = new BigInteger()
-  this.bitwiseTo(a, op_andnot, r)
-  return r
+function createBuffer (length) {
+  if (length > K_MAX_LENGTH) {
+    throw new RangeError('Invalid typed array length')
+  }
+  // Return an augmented `Uint8Array` instance
+  var buf = new Uint8Array(length)
+  buf.__proto__ = Buffer.prototype
+  return buf
 }
 
-// (public) ~this
-function bnNot() {
-  var r = new BigInteger()
-  for (var i = 0; i < this.t; ++i) r[i] = this.DM & ~this[i]
-  r.t = this.t
-  r.s = ~this.s
-  return r
-}
+/**
+ * The Buffer constructor returns instances of `Uint8Array` that have their
+ * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
+ * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
+ * and the `Uint8Array` methods. Square bracket notation works as expected -- it
+ * returns a single octet.
+ *
+ * The `Uint8Array` prototype remains unmodified.
+ */
 
-// (public) this << n
-function bnShiftLeft(n) {
-  var r = new BigInteger()
-  if (n < 0) this.rShiftTo(-n, r)
-  else this.lShiftTo(n, r)
-  return r
+function Buffer (arg, encodingOrOffset, length) {
+  // Common case.
+  if (typeof arg === 'number') {
+    if (typeof encodingOrOffset === 'string') {
+      throw new Error(
+        'If encoding is specified then the first argument must be a string'
+      )
+    }
+    return allocUnsafe(arg)
+  }
+  return from(arg, encodingOrOffset, length)
 }
 
-// (public) this >> n
-function bnShiftRight(n) {
-  var r = new BigInteger()
-  if (n < 0) this.lShiftTo(-n, r)
-  else this.rShiftTo(n, r)
-  return r
+// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
+if (typeof Symbol !== 'undefined' && Symbol.species &&
+    Buffer[Symbol.species] === Buffer) {
+  Object.defineProperty(Buffer, Symbol.species, {
+    value: null,
+    configurable: true,
+    enumerable: false,
+    writable: false
+  })
 }
 
-// return index of lowest 1-bit in x, x < 2^31
-function lbit(x) {
-  if (x == 0) return -1
-  var r = 0
-  if ((x & 0xffff) == 0) {
-    x >>= 16
-    r += 16
-  }
-  if ((x & 0xff) == 0) {
-    x >>= 8
-    r += 8
+Buffer.poolSize = 8192 // not used by this implementation
+
+function from (value, encodingOrOffset, length) {
+  if (typeof value === 'number') {
+    throw new TypeError('"value" argument must not be a number')
   }
-  if ((x & 0xf) == 0) {
-    x >>= 4
-    r += 4
+
+  if (value instanceof ArrayBuffer) {
+    return fromArrayBuffer(value, encodingOrOffset, length)
   }
-  if ((x & 3) == 0) {
-    x >>= 2
-    r += 2
+
+  if (typeof value === 'string') {
+    return fromString(value, encodingOrOffset)
   }
-  if ((x & 1) == 0)++r
-  return r
-}
 
-// (public) returns index of lowest 1-bit (or -1 if none)
-function bnGetLowestSetBit() {
-  for (var i = 0; i < this.t; ++i)
-    if (this[i] != 0) return i * this.DB + lbit(this[i])
-  if (this.s < 0) return this.t * this.DB
-  return -1
+  return fromObject(value)
 }
 
-// return number of 1 bits in x
-function cbit(x) {
-  var r = 0
-  while (x != 0) {
-    x &= x - 1
-    ++r
-  }
-  return r
+/**
+ * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
+ * if value is a number.
+ * Buffer.from(str[, encoding])
+ * Buffer.from(array)
+ * Buffer.from(buffer)
+ * Buffer.from(arrayBuffer[, byteOffset[, length]])
+ **/
+Buffer.from = function (value, encodingOrOffset, length) {
+  return from(value, encodingOrOffset, length)
 }
 
-// (public) return number of set bits
-function bnBitCount() {
-  var r = 0,
-    x = this.s & this.DM
-  for (var i = 0; i < this.t; ++i) r += cbit(this[i] ^ x)
-  return r
-}
+// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
+// https://github.com/feross/buffer/pull/148
+Buffer.prototype.__proto__ = Uint8Array.prototype
+Buffer.__proto__ = Uint8Array
 
-// (public) true iff nth bit is set
-function bnTestBit(n) {
-  var j = Math.floor(n / this.DB)
-  if (j >= this.t) return (this.s != 0)
-  return ((this[j] & (1 << (n % this.DB))) != 0)
+function assertSize (size) {
+  if (typeof size !== 'number') {
+    throw new TypeError('"size" argument must be a number')
+  } else if (size < 0) {
+    throw new RangeError('"size" argument must not be negative')
+  }
 }
 
-// (protected) this op (1<<n)
-function bnpChangeBit(n, op) {
-  var r = BigInteger.ONE.shiftLeft(n)
-  this.bitwiseTo(r, op, r)
-  return r
+function alloc (size, fill, encoding) {
+  assertSize(size)
+  if (size <= 0) {
+    return createBuffer(size)
+  }
+  if (fill !== undefined) {
+    // Only pay attention to encoding if it's a string. This
+    // prevents accidentally sending in a number that would
+    // be interpretted as a start offset.
+    return typeof encoding === 'string'
+      ? createBuffer(size).fill(fill, encoding)
+      : createBuffer(size).fill(fill)
+  }
+  return createBuffer(size)
 }
 
-// (public) this | (1<<n)
-function bnSetBit(n) {
-  return this.changeBit(n, op_or)
+/**
+ * Creates a new filled Buffer instance.
+ * alloc(size[, fill[, encoding]])
+ **/
+Buffer.alloc = function (size, fill, encoding) {
+  return alloc(size, fill, encoding)
 }
 
-// (public) this & ~(1<<n)
-function bnClearBit(n) {
-  return this.changeBit(n, op_andnot)
+function allocUnsafe (size) {
+  assertSize(size)
+  return createBuffer(size < 0 ? 0 : checked(size) | 0)
 }
 
-// (public) this ^ (1<<n)
-function bnFlipBit(n) {
-  return this.changeBit(n, op_xor)
+/**
+ * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
+ * */
+Buffer.allocUnsafe = function (size) {
+  return allocUnsafe(size)
+}
+/**
+ * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
+ */
+Buffer.allocUnsafeSlow = function (size) {
+  return allocUnsafe(size)
 }
 
-// (protected) r = this + a
-function bnpAddTo(a, r) {
-  var self = this
+function fromString (string, encoding) {
+  if (typeof encoding !== 'string' || encoding === '') {
+    encoding = 'utf8'
+  }
 
-  var i = 0,
-    c = 0,
-    m = Math.min(a.t, self.t)
-  while (i < m) {
-    c += self[i] + a[i]
-    r[i++] = c & self.DM
-    c >>= self.DB
+  if (!Buffer.isEncoding(encoding)) {
+    throw new TypeError('"encoding" must be a valid string encoding')
   }
-  if (a.t < self.t) {
-    c += a.s
-    while (i < self.t) {
-      c += self[i]
-      r[i++] = c & self.DM
-      c >>= self.DB
-    }
-    c += self.s
-  } else {
-    c += self.s
-    while (i < a.t) {
-      c += a[i]
-      r[i++] = c & self.DM
-      c >>= self.DB
-    }
-    c += a.s
-  }
-  r.s = (c < 0) ? -1 : 0
-  if (c > 0) r[i++] = c
-  else if (c < -1) r[i++] = self.DV + c
-  r.t = i
-  r.clamp()
-}
-
-// (public) this + a
-function bnAdd(a) {
-  var r = new BigInteger()
-  this.addTo(a, r)
-  return r
-}
 
-// (public) this - a
-function bnSubtract(a) {
-  var r = new BigInteger()
-  this.subTo(a, r)
-  return r
-}
+  var length = byteLength(string, encoding) | 0
+  var buf = createBuffer(length)
 
-// (public) this * a
-function bnMultiply(a) {
-  var r = new BigInteger()
-  this.multiplyTo(a, r)
-  return r
-}
+  var actual = buf.write(string, encoding)
 
-// (public) this^2
-function bnSquare() {
-  var r = new BigInteger()
-  this.squareTo(r)
-  return r
-}
+  if (actual !== length) {
+    // Writing a hex string, for example, that contains invalid characters will
+    // cause everything after the first invalid character to be ignored. (e.g.
+    // 'abxxcd' will be treated as 'ab')
+    buf = buf.slice(0, actual)
+  }
 
-// (public) this / a
-function bnDivide(a) {
-  var r = new BigInteger()
-  this.divRemTo(a, r, null)
-  return r
+  return buf
 }
 
-// (public) this % a
-function bnRemainder(a) {
-  var r = new BigInteger()
-  this.divRemTo(a, null, r)
-  return r
+function fromArrayLike (array) {
+  var length = array.length < 0 ? 0 : checked(array.length) | 0
+  var buf = createBuffer(length)
+  for (var i = 0; i < length; i += 1) {
+    buf[i] = array[i] & 255
+  }
+  return buf
 }
 
-// (public) [this/a,this%a]
-function bnDivideAndRemainder(a) {
-  var q = new BigInteger(),
-    r = new BigInteger()
-  this.divRemTo(a, q, r)
-  return new Array(q, r)
-}
+function fromArrayBuffer (array, byteOffset, length) {
+  if (byteOffset < 0 || array.byteLength < byteOffset) {
+    throw new RangeError('\'offset\' is out of bounds')
+  }
 
-// (protected) this *= n, this >= 0, 1 < n < DV
-function bnpDMultiply(n) {
-  this[this.t] = this.am(0, n - 1, this, 0, 0, this.t)
-  ++this.t
-  this.clamp()
-}
+  if (array.byteLength < byteOffset + (length || 0)) {
+    throw new RangeError('\'length\' is out of bounds')
+  }
 
-// (protected) this += n << w words, this >= 0
-function bnpDAddOffset(n, w) {
-  if (n == 0) return
-  while (this.t <= w) this[this.t++] = 0
-  this[w] += n
-  while (this[w] >= this.DV) {
-    this[w] -= this.DV
-    if (++w >= this.t) this[this.t++] = 0
-    ++this[w]
+  var buf
+  if (byteOffset === undefined && length === undefined) {
+    buf = new Uint8Array(array)
+  } else if (length === undefined) {
+    buf = new Uint8Array(array, byteOffset)
+  } else {
+    buf = new Uint8Array(array, byteOffset, length)
   }
+
+  // Return an augmented `Uint8Array` instance
+  buf.__proto__ = Buffer.prototype
+  return buf
 }
 
-// A "null" reducer
-function NullExp() {}
+function fromObject (obj) {
+  if (Buffer.isBuffer(obj)) {
+    var len = checked(obj.length) | 0
+    var buf = createBuffer(len)
 
-function nNop(x) {
-  return x
-}
+    if (buf.length === 0) {
+      return buf
+    }
 
-function nMulTo(x, y, r) {
-  x.multiplyTo(y, r)
-}
+    obj.copy(buf, 0, 0, len)
+    return buf
+  }
 
-function nSqrTo(x, r) {
-  x.squareTo(r)
-}
+  if (obj) {
+    if (isArrayBufferView(obj) || 'length' in obj) {
+      if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
+        return createBuffer(0)
+      }
+      return fromArrayLike(obj)
+    }
 
-NullExp.prototype.convert = nNop
-NullExp.prototype.revert = nNop
-NullExp.prototype.mulTo = nMulTo
-NullExp.prototype.sqrTo = nSqrTo
+    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
+      return fromArrayLike(obj.data)
+    }
+  }
 
-// (public) this^e
-function bnPow(e) {
-  return this.exp(e, new NullExp())
+  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
 }
 
-// (protected) r = lower n words of "this * a", a.t <= n
-// "this" should be the larger one if appropriate.
-function bnpMultiplyLowerTo(a, n, r) {
-  var i = Math.min(this.t + a.t, n)
-  r.s = 0; // assumes a,this >= 0
-  r.t = i
-  while (i > 0) r[--i] = 0
-  var j
-  for (j = r.t - this.t; i < j; ++i) r[i + this.t] = this.am(0, a[i], r, i, 0, this.t)
-  for (j = Math.min(a.t, n); i < j; ++i) this.am(0, a[i], r, i, 0, n - i)
-  r.clamp()
+function checked (length) {
+  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
+  // length is NaN (which is otherwise coerced to zero.)
+  if (length >= K_MAX_LENGTH) {
+    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
+                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
+  }
+  return length | 0
 }
 
-// (protected) r = "this * a" without lower n words, n > 0
-// "this" should be the larger one if appropriate.
-function bnpMultiplyUpperTo(a, n, r) {
-  --n
-  var i = r.t = this.t + a.t - n
-  r.s = 0; // assumes a,this >= 0
-  while (--i >= 0) r[i] = 0
-  for (i = Math.max(n - this.t, 0); i < a.t; ++i)
-    r[this.t + i - n] = this.am(n - i, a[i], r, 0, 0, this.t + i - n)
-  r.clamp()
-  r.drShiftTo(1, r)
+function SlowBuffer (length) {
+  if (+length != length) { // eslint-disable-line eqeqeq
+    length = 0
+  }
+  return Buffer.alloc(+length)
 }
 
-// Barrett modular reduction
-function Barrett(m) {
-  // setup Barrett
-  this.r2 = new BigInteger()
-  this.q3 = new BigInteger()
-  BigInteger.ONE.dlShiftTo(2 * m.t, this.r2)
-  this.mu = this.r2.divide(m)
-  this.m = m
+Buffer.isBuffer = function isBuffer (b) {
+  return b != null && b._isBuffer === true
 }
 
-function barrettConvert(x) {
-  if (x.s < 0 || x.t > 2 * this.m.t) return x.mod(this.m)
-  else if (x.compareTo(this.m) < 0) return x
-  else {
-    var r = new BigInteger()
-    x.copyTo(r)
-    this.reduce(r)
-    return r
+Buffer.compare = function compare (a, b) {
+  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
+    throw new TypeError('Arguments must be Buffers')
   }
-}
 
-function barrettRevert(x) {
-  return x
-}
+  if (a === b) return 0
 
-// x = x mod m (HAC 14.42)
-function barrettReduce(x) {
-  var self = this
-  x.drShiftTo(self.m.t - 1, self.r2)
-  if (x.t > self.m.t + 1) {
-    x.t = self.m.t + 1
-    x.clamp()
+  var x = a.length
+  var y = b.length
+
+  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
+    if (a[i] !== b[i]) {
+      x = a[i]
+      y = b[i]
+      break
+    }
   }
-  self.mu.multiplyUpperTo(self.r2, self.m.t + 1, self.q3)
-  self.m.multiplyLowerTo(self.q3, self.m.t + 1, self.r2)
-  while (x.compareTo(self.r2) < 0) x.dAddOffset(1, self.m.t + 1)
-  x.subTo(self.r2, x)
-  while (x.compareTo(self.m) >= 0) x.subTo(self.m, x)
-}
 
-// r = x^2 mod m; x != r
-function barrettSqrTo(x, r) {
-  x.squareTo(r)
-  this.reduce(r)
+  if (x < y) return -1
+  if (y < x) return 1
+  return 0
 }
 
-// r = x*y mod m; x,y != r
-function barrettMulTo(x, y, r) {
-  x.multiplyTo(y, r)
-  this.reduce(r)
+Buffer.isEncoding = function isEncoding (encoding) {
+  switch (String(encoding).toLowerCase()) {
+    case 'hex':
+    case 'utf8':
+    case 'utf-8':
+    case 'ascii':
+    case 'latin1':
+    case 'binary':
+    case 'base64':
+    case 'ucs2':
+    case 'ucs-2':
+    case 'utf16le':
+    case 'utf-16le':
+      return true
+    default:
+      return false
+  }
 }
 
-Barrett.prototype.convert = barrettConvert
-Barrett.prototype.revert = barrettRevert
-Barrett.prototype.reduce = barrettReduce
-Barrett.prototype.mulTo = barrettMulTo
-Barrett.prototype.sqrTo = barrettSqrTo
-
-// (public) this^e % m (HAC 14.85)
-function bnModPow(e, m) {
-  var i = e.bitLength(),
-    k, r = nbv(1),
-    z
-  if (i <= 0) return r
-  else if (i < 18) k = 1
-  else if (i < 48) k = 3
-  else if (i < 144) k = 4
-  else if (i < 768) k = 5
-  else k = 6
-  if (i < 8)
-    z = new Classic(m)
-  else if (m.isEven())
-    z = new Barrett(m)
-  else
-    z = new Montgomery(m)
-
-  // precomputation
-  var g = new Array(),
-    n = 3,
-    k1 = k - 1,
-    km = (1 << k) - 1
-  g[1] = z.convert(this)
-  if (k > 1) {
-    var g2 = new BigInteger()
-    z.sqrTo(g[1], g2)
-    while (n <= km) {
-      g[n] = new BigInteger()
-      z.mulTo(g2, g[n - 2], g[n])
-      n += 2
-    }
+Buffer.concat = function concat (list, length) {
+  if (!Array.isArray(list)) {
+    throw new TypeError('"list" argument must be an Array of Buffers')
   }
 
-  var j = e.t - 1,
-    w, is1 = true,
-    r2 = new BigInteger(),
-    t
-  i = nbits(e[j]) - 1
-  while (j >= 0) {
-    if (i >= k1) w = (e[j] >> (i - k1)) & km
-    else {
-      w = (e[j] & ((1 << (i + 1)) - 1)) << (k1 - i)
-      if (j > 0) w |= e[j - 1] >> (this.DB + i - k1)
-    }
+  if (list.length === 0) {
+    return Buffer.alloc(0)
+  }
 
-    n = k
-    while ((w & 1) == 0) {
-      w >>= 1
-      --n
-    }
-    if ((i -= n) < 0) {
-      i += this.DB
-      --j
-    }
-    if (is1) { // ret == 1, don't bother squaring or multiplying it
-      g[w].copyTo(r)
-      is1 = false
-    } else {
-      while (n > 1) {
-        z.sqrTo(r, r2)
-        z.sqrTo(r2, r)
-        n -= 2
-      }
-      if (n > 0) z.sqrTo(r, r2)
-      else {
-        t = r
-        r = r2
-        r2 = t
-      }
-      z.mulTo(r2, g[w], r)
+  var i
+  if (length === undefined) {
+    length = 0
+    for (i = 0; i < list.length; ++i) {
+      length += list[i].length
     }
+  }
 
-    while (j >= 0 && (e[j] & (1 << i)) == 0) {
-      z.sqrTo(r, r2)
-      t = r
-      r = r2
-      r2 = t
-      if (--i < 0) {
-        i = this.DB - 1
-        --j
-      }
+  var buffer = Buffer.allocUnsafe(length)
+  var pos = 0
+  for (i = 0; i < list.length; ++i) {
+    var buf = list[i]
+    if (!Buffer.isBuffer(buf)) {
+      throw new TypeError('"list" argument must be an Array of Buffers')
     }
+    buf.copy(buffer, pos)
+    pos += buf.length
   }
-  return z.revert(r)
+  return buffer
 }
 
-// (public) gcd(this,a) (HAC 14.54)
-function bnGCD(a) {
-  var x = (this.s < 0) ? this.negate() : this.clone()
-  var y = (a.s < 0) ? a.negate() : a.clone()
-  if (x.compareTo(y) < 0) {
-    var t = x
-    x = y
-    y = t
+function byteLength (string, encoding) {
+  if (Buffer.isBuffer(string)) {
+    return string.length
   }
-  var i = x.getLowestSetBit(),
-    g = y.getLowestSetBit()
-  if (g < 0) return x
-  if (i < g) g = i
-  if (g > 0) {
-    x.rShiftTo(g, x)
-    y.rShiftTo(g, y)
+  if (isArrayBufferView(string) || string instanceof ArrayBuffer) {
+    return string.byteLength
   }
-  while (x.signum() > 0) {
-    if ((i = x.getLowestSetBit()) > 0) x.rShiftTo(i, x)
-    if ((i = y.getLowestSetBit()) > 0) y.rShiftTo(i, y)
-    if (x.compareTo(y) >= 0) {
-      x.subTo(y, x)
-      x.rShiftTo(1, x)
-    } else {
-      y.subTo(x, y)
-      y.rShiftTo(1, y)
-    }
+  if (typeof string !== 'string') {
+    string = '' + string
   }
-  if (g > 0) y.lShiftTo(g, y)
-  return y
-}
 
-// (protected) this % n, n < 2^26
-function bnpModInt(n) {
-  if (n <= 0) return 0
-  var d = this.DV % n,
-    r = (this.s < 0) ? n - 1 : 0
-  if (this.t > 0)
-    if (d == 0) r = this[0] % n
-    else
-      for (var i = this.t - 1; i >= 0; --i) r = (d * r + this[i]) % n
-  return r
-}
+  var len = string.length
+  if (len === 0) return 0
 
-// (public) 1/this % m (HAC 14.61)
-function bnModInverse(m) {
-  var ac = m.isEven()
-  if ((this.isEven() && ac) || m.signum() == 0) return BigInteger.ZERO
-  var u = m.clone(),
-    v = this.clone()
-  var a = nbv(1),
-    b = nbv(0),
-    c = nbv(0),
-    d = nbv(1)
-  while (u.signum() != 0) {
-    while (u.isEven()) {
-      u.rShiftTo(1, u)
-      if (ac) {
-        if (!a.isEven() || !b.isEven()) {
-          a.addTo(this, a)
-          b.subTo(m, b)
-        }
-        a.rShiftTo(1, a)
-      } else if (!b.isEven()) b.subTo(m, b)
-      b.rShiftTo(1, b)
-    }
-    while (v.isEven()) {
-      v.rShiftTo(1, v)
-      if (ac) {
-        if (!c.isEven() || !d.isEven()) {
-          c.addTo(this, c)
-          d.subTo(m, d)
-        }
-        c.rShiftTo(1, c)
-      } else if (!d.isEven()) d.subTo(m, d)
-      d.rShiftTo(1, d)
-    }
-    if (u.compareTo(v) >= 0) {
-      u.subTo(v, u)
-      if (ac) a.subTo(c, a)
-      b.subTo(d, b)
-    } else {
-      v.subTo(u, v)
-      if (ac) c.subTo(a, c)
-      d.subTo(b, d)
+  // Use a for loop to avoid recursion
+  var loweredCase = false
+  for (;;) {
+    switch (encoding) {
+      case 'ascii':
+      case 'latin1':
+      case 'binary':
+        return len
+      case 'utf8':
+      case 'utf-8':
+      case undefined:
+        return utf8ToBytes(string).length
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return len * 2
+      case 'hex':
+        return len >>> 1
+      case 'base64':
+        return base64ToBytes(string).length
+      default:
+        if (loweredCase) return utf8ToBytes(string).length // assume utf8
+        encoding = ('' + encoding).toLowerCase()
+        loweredCase = true
     }
   }
-  if (v.compareTo(BigInteger.ONE) != 0) return BigInteger.ZERO
-  if (d.compareTo(m) >= 0) return d.subtract(m)
-  if (d.signum() < 0) d.addTo(m, d)
-  else return d
-  if (d.signum() < 0) return d.add(m)
-  else return d
 }
+Buffer.byteLength = byteLength
 
-var lowprimes = [
-  2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
-  73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
-  157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233,
-  239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317,
-  331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419,
-  421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
-  509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607,
-  613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
-  709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811,
-  821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911,
-  919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
-]
+function slowToString (encoding, start, end) {
+  var loweredCase = false
 
-var lplim = (1 << 26) / lowprimes[lowprimes.length - 1]
+  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
+  // property of a typed array.
 
-// (public) test primality with certainty >= 1-.5^t
-function bnIsProbablePrime(t) {
-  var i, x = this.abs()
-  if (x.t == 1 && x[0] <= lowprimes[lowprimes.length - 1]) {
-    for (i = 0; i < lowprimes.length; ++i)
-      if (x[0] == lowprimes[i]) return true
-    return false
-  }
-  if (x.isEven()) return false
-  i = 1
-  while (i < lowprimes.length) {
-    var m = lowprimes[i],
-      j = i + 1
-    while (j < lowprimes.length && m < lplim) m *= lowprimes[j++]
-    m = x.modInt(m)
-    while (i < j) if (m % lowprimes[i++] == 0) return false
+  // This behaves neither like String nor Uint8Array in that we set start/end
+  // to their upper/lower bounds if the value passed is out of range.
+  // undefined is handled specially as per ECMA-262 6th Edition,
+  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
+  if (start === undefined || start < 0) {
+    start = 0
   }
-  return x.millerRabin(t)
-}
-
-// (protected) true if probably prime (HAC 4.24, Miller-Rabin)
-function bnpMillerRabin(t) {
-  var n1 = this.subtract(BigInteger.ONE)
-  var k = n1.getLowestSetBit()
-  if (k <= 0) return false
-  var r = n1.shiftRight(k)
-  t = (t + 1) >> 1
-  if (t > lowprimes.length) t = lowprimes.length
-  var a = new BigInteger(null)
-  var j, bases = []
-  for (var i = 0; i < t; ++i) {
-    for (;;) {
-      j = lowprimes[Math.floor(Math.random() * lowprimes.length)]
-      if (bases.indexOf(j) == -1) break
-    }
-    bases.push(j)
-    a.fromInt(j)
-    var y = a.modPow(r, this)
-    if (y.compareTo(BigInteger.ONE) != 0 && y.compareTo(n1) != 0) {
-      var j = 1
-      while (j++ < k && y.compareTo(n1) != 0) {
-        y = y.modPowInt(2, this)
-        if (y.compareTo(BigInteger.ONE) == 0) return false
-      }
-      if (y.compareTo(n1) != 0) return false
-    }
+  // Return early if start > this.length. Done here to prevent potential uint32
+  // coercion fail below.
+  if (start > this.length) {
+    return ''
   }
-  return true
-}
-
-// protected
-proto.chunkSize = bnpChunkSize
-proto.toRadix = bnpToRadix
-proto.fromRadix = bnpFromRadix
-proto.fromNumber = bnpFromNumber
-proto.bitwiseTo = bnpBitwiseTo
-proto.changeBit = bnpChangeBit
-proto.addTo = bnpAddTo
-proto.dMultiply = bnpDMultiply
-proto.dAddOffset = bnpDAddOffset
-proto.multiplyLowerTo = bnpMultiplyLowerTo
-proto.multiplyUpperTo = bnpMultiplyUpperTo
-proto.modInt = bnpModInt
-proto.millerRabin = bnpMillerRabin
 
-// public
-proto.clone = bnClone
-proto.intValue = bnIntValue
-proto.byteValue = bnByteValue
-proto.shortValue = bnShortValue
-proto.signum = bnSigNum
-proto.toByteArray = bnToByteArray
-proto.equals = bnEquals
-proto.min = bnMin
-proto.max = bnMax
-proto.and = bnAnd
-proto.or = bnOr
-proto.xor = bnXor
-proto.andNot = bnAndNot
-proto.not = bnNot
-proto.shiftLeft = bnShiftLeft
-proto.shiftRight = bnShiftRight
-proto.getLowestSetBit = bnGetLowestSetBit
-proto.bitCount = bnBitCount
-proto.testBit = bnTestBit
-proto.setBit = bnSetBit
-proto.clearBit = bnClearBit
-proto.flipBit = bnFlipBit
-proto.add = bnAdd
-proto.subtract = bnSubtract
-proto.multiply = bnMultiply
-proto.divide = bnDivide
-proto.remainder = bnRemainder
-proto.divideAndRemainder = bnDivideAndRemainder
-proto.modPow = bnModPow
-proto.modInverse = bnModInverse
-proto.pow = bnPow
-proto.gcd = bnGCD
-proto.isProbablePrime = bnIsProbablePrime
+  if (end === undefined || end > this.length) {
+    end = this.length
+  }
 
-// JSBN-specific extension
-proto.square = bnSquare
+  if (end <= 0) {
+    return ''
+  }
 
-// constants
-BigInteger.ZERO = nbv(0)
-BigInteger.ONE = nbv(1)
-BigInteger.valueOf = nbv
+  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
+  end >>>= 0
+  start >>>= 0
 
-module.exports = BigInteger
+  if (end <= start) {
+    return ''
+  }
 
-},{"../package.json":4}],2:[function(require,module,exports){
-(function (Buffer){
-// FIXME: Kind of a weird way to throw exceptions, consider removing
-var assert = require('assert')
-var BigInteger = require('./bigi')
+  if (!encoding) encoding = 'utf8'
 
-/**
- * Turns a byte array into a big integer.
- *
- * This function will interpret a byte array as a big integer in big
- * endian notation.
- */
-BigInteger.fromByteArrayUnsigned = function(byteArray) {
-  // BigInteger expects a DER integer conformant byte array
-  if (byteArray[0] & 0x80) {
-    return new BigInteger([0].concat(byteArray))
-  }
+  while (true) {
+    switch (encoding) {
+      case 'hex':
+        return hexSlice(this, start, end)
 
-  return new BigInteger(byteArray)
-}
+      case 'utf8':
+      case 'utf-8':
+        return utf8Slice(this, start, end)
 
-/**
- * Returns a byte array representation of the big integer.
- *
- * This returns the absolute of the contained value in big endian
- * form. A value of zero results in an empty array.
- */
-BigInteger.prototype.toByteArrayUnsigned = function() {
-  var byteArray = this.toByteArray()
-  return byteArray[0] === 0 ? byteArray.slice(1) : byteArray
-}
+      case 'ascii':
+        return asciiSlice(this, start, end)
 
-BigInteger.fromDERInteger = function(byteArray) {
-  return new BigInteger(byteArray)
-}
+      case 'latin1':
+      case 'binary':
+        return latin1Slice(this, start, end)
 
-/*
- * Converts BigInteger to a DER integer representation.
- *
- * The format for this value uses the most significant bit as a sign
- * bit.  If the most significant bit is already set and the integer is
- * positive, a 0x00 is prepended.
- *
- * Examples:
- *
- *      0 =>     0x00
- *      1 =>     0x01
- *     -1 =>     0xff
- *    127 =>     0x7f
- *   -127 =>     0x81
- *    128 =>   0x0080
- *   -128 =>     0x80
- *    255 =>   0x00ff
- *   -255 =>   0xff01
- *  16300 =>   0x3fac
- * -16300 =>   0xc054
- *  62300 => 0x00f35c
- * -62300 => 0xff0ca4
-*/
-BigInteger.prototype.toDERInteger = BigInteger.prototype.toByteArray
+      case 'base64':
+        return base64Slice(this, start, end)
 
-BigInteger.fromBuffer = function(buffer) {
-  // BigInteger expects a DER integer conformant byte array
-  if (buffer[0] & 0x80) {
-    var byteArray = Array.prototype.slice.call(buffer)
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return utf16leSlice(this, start, end)
 
-    return new BigInteger([0].concat(byteArray))
+      default:
+        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
+        encoding = (encoding + '').toLowerCase()
+        loweredCase = true
+    }
   }
-
-  return new BigInteger(buffer)
 }
 
-BigInteger.fromHex = function(hex) {
-  if (hex === '') return BigInteger.ZERO
+// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
+// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
+// reliably in a browserify context because there could be multiple different
+// copies of the 'buffer' package in use. This method works even for Buffer
+// instances that were created from another copy of the `buffer` package.
+// See: https://github.com/feross/buffer/issues/154
+Buffer.prototype._isBuffer = true
 
-  assert.equal(hex, hex.match(/^[A-Fa-f0-9]+/), 'Invalid hex string')
-  assert.equal(hex.length % 2, 0, 'Incomplete hex')
-  return new BigInteger(hex, 16)
+function swap (b, n, m) {
+  var i = b[n]
+  b[n] = b[m]
+  b[m] = i
 }
 
-BigInteger.prototype.toBuffer = function(size) {
-  var byteArray = this.toByteArrayUnsigned()
-  var zeros = []
-
-  var padding = size - byteArray.length
-  while (zeros.length < padding) zeros.push(0)
-
-  return new Buffer(zeros.concat(byteArray))
+Buffer.prototype.swap16 = function swap16 () {
+  var len = this.length
+  if (len % 2 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 16-bits')
+  }
+  for (var i = 0; i < len; i += 2) {
+    swap(this, i, i + 1)
+  }
+  return this
 }
 
-BigInteger.prototype.toHex = function(size) {
-  return this.toBuffer(size).toString('hex')
+Buffer.prototype.swap32 = function swap32 () {
+  var len = this.length
+  if (len % 4 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 32-bits')
+  }
+  for (var i = 0; i < len; i += 4) {
+    swap(this, i, i + 3)
+    swap(this, i + 1, i + 2)
+  }
+  return this
 }
 
-}).call(this,require("buffer").Buffer)
-},{"./bigi":1,"assert":5,"buffer":7}],3:[function(require,module,exports){
-var BigInteger = require('./bigi')
-
-//addons
-require('./convert')
-
-module.exports = BigInteger
-},{"./bigi":1,"./convert":2}],4:[function(require,module,exports){
-module.exports={
-  "name": "bigi",
-  "version": "1.4.0",
-  "description": "Big integers.",
-  "keywords": [
-    "cryptography",
-    "math",
-    "bitcoin",
-    "arbitrary",
-    "precision",
-    "arithmetic",
-    "big",
-    "integer",
-    "int",
-    "number",
-    "biginteger",
-    "bigint",
-    "bignumber",
-    "decimal",
-    "float"
-  ],
-  "devDependencies": {
-    "mocha": "^1.20.1",
-    "jshint": "^2.5.1",
-    "coveralls": "^2.10.0",
-    "istanbul": "^0.2.11"
-  },
-  "repository": {
-    "url": "https://github.com/cryptocoinjs/bigi",
-    "type": "git"
-  },
-  "main": "./lib/index.js",
-  "scripts": {
-    "test": "_mocha -- test/*.js",
-    "jshint": "jshint --config jshint.json lib/*.js ; true",
-    "unit": "mocha",
-    "coverage": "istanbul cover ./node_modules/.bin/_mocha -- --reporter list test/*.js",
-    "coveralls": "npm run-script coverage && node ./node_modules/.bin/coveralls < coverage/lcov.info"
-  },
-  "dependencies": {},
-  "testling": {
-    "files": "test/*.js",
-    "harness": "mocha",
-    "browsers": [
-      "ie/9..latest",
-      "firefox/latest",
-      "chrome/latest",
-      "safari/6.0..latest",
-      "iphone/6.0..latest",
-      "android-browser/4.2..latest"
-    ]
-  },
-  "bugs": {
-    "url": "https://github.com/cryptocoinjs/bigi/issues"
-  },
-  "homepage": "https://github.com/cryptocoinjs/bigi",
-  "_id": "bigi@1.4.0",
-  "dist": {
-    "shasum": "90ac1aeac0a531216463bdb58f42c1e05c8407ac",
-    "tarball": "http://registry.npmjs.org/bigi/-/bigi-1.4.0.tgz"
-  },
-  "_from": "bigi@^1.4.0",
-  "_npmVersion": "1.4.3",
-  "_npmUser": {
-    "name": "jp",
-    "email": "jprichardson@gmail.com"
-  },
-  "maintainers": [
-    {
-      "name": "jp",
-      "email": "jprichardson@gmail.com"
-    },
-    {
-      "name": "midnightlightning",
-      "email": "boydb@midnightdesign.ws"
-    },
-    {
-      "name": "sidazhang",
-      "email": "sidazhang89@gmail.com"
-    },
-    {
-      "name": "nadav",
-      "email": "npm@shesek.info"
-    }
-  ],
-  "directories": {},
-  "_shasum": "90ac1aeac0a531216463bdb58f42c1e05c8407ac",
-  "_resolved": "https://registry.npmjs.org/bigi/-/bigi-1.4.0.tgz"
+Buffer.prototype.swap64 = function swap64 () {
+  var len = this.length
+  if (len % 8 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 64-bits')
+  }
+  for (var i = 0; i < len; i += 8) {
+    swap(this, i, i + 7)
+    swap(this, i + 1, i + 6)
+    swap(this, i + 2, i + 5)
+    swap(this, i + 3, i + 4)
+  }
+  return this
 }
 
-},{}],5:[function(require,module,exports){
-// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
-//
-// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
-//
-// Originally from narwhal.js (http://narwhaljs.org)
-// Copyright (c) 2009 Thomas Robinson <280north.com>
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the 'Software'), to
-// deal in the Software without restriction, including without limitation the
-// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-// sell copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// when used in node, this will actually load the util module we depend on
-// versus loading the builtin util module as happens otherwise
-// this is a bug in node module loading as far as I am concerned
-var util = require('util/');
-
-var pSlice = Array.prototype.slice;
-var hasOwn = Object.prototype.hasOwnProperty;
-
-// 1. The assert module provides functions that throw
-// AssertionError's when particular conditions are not met. The
-// assert module must conform to the following interface.
-
-var assert = module.exports = ok;
+Buffer.prototype.toString = function toString () {
+  var length = this.length
+  if (length === 0) return ''
+  if (arguments.length === 0) return utf8Slice(this, 0, length)
+  return slowToString.apply(this, arguments)
+}
 
-// 2. The AssertionError is defined in assert.
-// new assert.AssertionError({ message: message,
-//                             actual: actual,
-//                             expected: expected })
+Buffer.prototype.equals = function equals (b) {
+  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
+  if (this === b) return true
+  return Buffer.compare(this, b) === 0
+}
 
-assert.AssertionError = function AssertionError(options) {
-  this.name = 'AssertionError';
-  this.actual = options.actual;
-  this.expected = options.expected;
-  this.operator = options.operator;
-  if (options.message) {
-    this.message = options.message;
-    this.generatedMessage = false;
-  } else {
-    this.message = getMessage(this);
-    this.generatedMessage = true;
+Buffer.prototype.inspect = function inspect () {
+  var str = ''
+  var max = exports.INSPECT_MAX_BYTES
+  if (this.length > 0) {
+    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
+    if (this.length > max) str += ' ... '
   }
-  var stackStartFunction = options.stackStartFunction || fail;
+  return '<Buffer ' + str + '>'
+}
 
-  if (Error.captureStackTrace) {
-    Error.captureStackTrace(this, stackStartFunction);
+Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
+  if (!Buffer.isBuffer(target)) {
+    throw new TypeError('Argument must be a Buffer')
   }
-  else {
-    // non v8 browsers so we can have a stacktrace
-    var err = new Error();
-    if (err.stack) {
-      var out = err.stack;
-
-      // try to strip useless frames
-      var fn_name = stackStartFunction.name;
-      var idx = out.indexOf('\n' + fn_name);
-      if (idx >= 0) {
-        // once we have located the function frame
-        // we need to strip out everything before it (and its line)
-        var next_line = out.indexOf('\n', idx + 1);
-        out = out.substring(next_line + 1);
-      }
 
-      this.stack = out;
-    }
+  if (start === undefined) {
+    start = 0
   }
-};
-
-// assert.AssertionError instanceof Error
-util.inherits(assert.AssertionError, Error);
-
-function replacer(key, value) {
-  if (util.isUndefined(value)) {
-    return '' + value;
+  if (end === undefined) {
+    end = target ? target.length : 0
   }
-  if (util.isNumber(value) && !isFinite(value)) {
-    return value.toString();
+  if (thisStart === undefined) {
+    thisStart = 0
   }
-  if (util.isFunction(value) || util.isRegExp(value)) {
-    return value.toString();
+  if (thisEnd === undefined) {
+    thisEnd = this.length
   }
-  return value;
-}
 
-function truncate(s, n) {
-  if (util.isString(s)) {
-    return s.length < n ? s : s.slice(0, n);
-  } else {
-    return s;
+  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
+    throw new RangeError('out of range index')
   }
-}
 
-function getMessage(self) {
-  return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
-         self.operator + ' ' +
-         truncate(JSON.stringify(self.expected, replacer), 128);
-}
+  if (thisStart >= thisEnd && start >= end) {
+    return 0
+  }
+  if (thisStart >= thisEnd) {
+    return -1
+  }
+  if (start >= end) {
+    return 1
+  }
 
-// At present only the three keys mentioned above are used and
-// understood by the spec. Implementations or sub modules can pass
-// other keys to the AssertionError's constructor - they will be
-// ignored.
+  start >>>= 0
+  end >>>= 0
+  thisStart >>>= 0
+  thisEnd >>>= 0
 
-// 3. All of the following functions must throw an AssertionError
-// when a corresponding condition is not met, with a message that
-// may be undefined if not provided.  All assertion methods provide
-// both the actual and expected values to the assertion error for
-// display purposes.
+  if (this === target) return 0
 
-function fail(actual, expected, message, operator, stackStartFunction) {
-  throw new assert.AssertionError({
-    message: message,
-    actual: actual,
-    expected: expected,
-    operator: operator,
-    stackStartFunction: stackStartFunction
-  });
-}
+  var x = thisEnd - thisStart
+  var y = end - start
+  var len = Math.min(x, y)
 
-// EXTENSION! allows for well behaved errors defined elsewhere.
-assert.fail = fail;
+  var thisCopy = this.slice(thisStart, thisEnd)
+  var targetCopy = target.slice(start, end)
 
-// 4. Pure assertion tests whether a value is truthy, as determined
-// by !!guard.
-// assert.ok(guard, message_opt);
-// This statement is equivalent to assert.equal(true, !!guard,
-// message_opt);. To test strictly for the value true, use
-// assert.strictEqual(true, guard, message_opt);.
+  for (var i = 0; i < len; ++i) {
+    if (thisCopy[i] !== targetCopy[i]) {
+      x = thisCopy[i]
+      y = targetCopy[i]
+      break
+    }
+  }
 
-function ok(value, message) {
-  if (!value) fail(value, true, message, '==', assert.ok);
+  if (x < y) return -1
+  if (y < x) return 1
+  return 0
 }
-assert.ok = ok;
 
-// 5. The equality assertion tests shallow, coercive equality with
-// ==.
-// assert.equal(actual, expected, message_opt);
+// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
+// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
+//
+// Arguments:
+// - buffer - a Buffer to search
+// - val - a string, Buffer, or number
+// - byteOffset - an index into `buffer`; will be clamped to an int32
+// - encoding - an optional encoding, relevant is val is a string
+// - dir - true for indexOf, false for lastIndexOf
+function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
+  // Empty buffer means no match
+  if (buffer.length === 0) return -1
 
-assert.equal = function equal(actual, expected, message) {
-  if (actual != expected) fail(actual, expected, message, '==', assert.equal);
-};
-
-// 6. The non-equality assertion tests for whether two objects are not equal
-// with != assert.notEqual(actual, expected, message_opt);
-
-assert.notEqual = function notEqual(actual, expected, message) {
-  if (actual == expected) {
-    fail(actual, expected, message, '!=', assert.notEqual);
+  // Normalize byteOffset
+  if (typeof byteOffset === 'string') {
+    encoding = byteOffset
+    byteOffset = 0
+  } else if (byteOffset > 0x7fffffff) {
+    byteOffset = 0x7fffffff
+  } else if (byteOffset < -0x80000000) {
+    byteOffset = -0x80000000
   }
-};
-
-// 7. The equivalence assertion tests a deep equality relation.
-// assert.deepEqual(actual, expected, message_opt);
-
-assert.deepEqual = function deepEqual(actual, expected, message) {
-  if (!_deepEqual(actual, expected)) {
-    fail(actual, expected, message, 'deepEqual', assert.deepEqual);
+  byteOffset = +byteOffset  // Coerce to Number.
+  if (numberIsNaN(byteOffset)) {
+    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
+    byteOffset = dir ? 0 : (buffer.length - 1)
   }
-};
 
-function _deepEqual(actual, expected) {
-  // 7.1. All identical values are equivalent, as determined by ===.
-  if (actual === expected) {
-    return true;
+  // Normalize byteOffset: negative offsets start from the end of the buffer
+  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
+  if (byteOffset >= buffer.length) {
+    if (dir) return -1
+    else byteOffset = buffer.length - 1
+  } else if (byteOffset < 0) {
+    if (dir) byteOffset = 0
+    else return -1
+  }
 
-  } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
-    if (actual.length != expected.length) return false;
+  // Normalize val
+  if (typeof val === 'string') {
+    val = Buffer.from(val, encoding)
+  }
 
-    for (var i = 0; i < actual.length; i++) {
-      if (actual[i] !== expected[i]) return false;
+  // Finally, search either indexOf (if dir is true) or lastIndexOf
+  if (Buffer.isBuffer(val)) {
+    // Special case: looking for empty string/buffer always fails
+    if (val.length === 0) {
+      return -1
     }
-
-    return true;
-
-  // 7.2. If the expected value is a Date object, the actual value is
-  // equivalent if it is also a Date object that refers to the same time.
-  } else if (util.isDate(actual) && util.isDate(expected)) {
-    return actual.getTime() === expected.getTime();
-
-  // 7.3 If the expected value is a RegExp object, the actual value is
-  // equivalent if it is also a RegExp object with the same source and
-  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
-  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
-    return actual.source === expected.source &&
-           actual.global === expected.global &&
-           actual.multiline === expected.multiline &&
-           actual.lastIndex === expected.lastIndex &&
-           actual.ignoreCase === expected.ignoreCase;
-
-  // 7.4. Other pairs that do not both pass typeof value == 'object',
-  // equivalence is determined by ==.
-  } else if (!util.isObject(actual) && !util.isObject(expected)) {
-    return actual == expected;
-
-  // 7.5 For all other Object pairs, including Array objects, equivalence is
-  // determined by having the same number of owned properties (as verified
-  // with Object.prototype.hasOwnProperty.call), the same set of keys
-  // (although not necessarily the same order), equivalent values for every
-  // corresponding key, and an identical 'prototype' property. Note: this
-  // accounts for both named and indexed properties on Arrays.
-  } else {
-    return objEquiv(actual, expected);
+    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
+  } else if (typeof val === 'number') {
+    val = val & 0xFF // Search for a byte value [0-255]
+    if (typeof Uint8Array.prototype.indexOf === 'function') {
+      if (dir) {
+        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
+      } else {
+        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
+      }
+    }
+    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
   }
-}
-
-function isArguments(object) {
-  return Object.prototype.toString.call(object) == '[object Arguments]';
-}
 
-function objEquiv(a, b) {
-  if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
-    return false;
-  // an identical 'prototype' property.
-  if (a.prototype !== b.prototype) return false;
-  // if one is a primitive, the other must be same
-  if (util.isPrimitive(a) || util.isPrimitive(b)) {
-    return a === b;
-  }
-  var aIsArgs = isArguments(a),
-      bIsArgs = isArguments(b);
-  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
-    return false;
-  if (aIsArgs) {
-    a = pSlice.call(a);
-    b = pSlice.call(b);
-    return _deepEqual(a, b);
-  }
-  var ka = objectKeys(a),
-      kb = objectKeys(b),
-      key, i;
-  // having the same number of owned properties (keys incorporates
-  // hasOwnProperty)
-  if (ka.length != kb.length)
-    return false;
-  //the same set of keys (although not necessarily the same order),
-  ka.sort();
-  kb.sort();
-  //~~~cheap key test
-  for (i = ka.length - 1; i >= 0; i--) {
-    if (ka[i] != kb[i])
-      return false;
-  }
-  //equivalent values for every corresponding key, and
-  //~~~possibly expensive deep test
-  for (i = ka.length - 1; i >= 0; i--) {
-    key = ka[i];
-    if (!_deepEqual(a[key], b[key])) return false;
-  }
-  return true;
+  throw new TypeError('val must be string, number or Buffer')
 }
 
-// 8. The non-equivalence assertion tests for any deep inequality.
-// assert.notDeepEqual(actual, expected, message_opt);
-
-assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
-  if (_deepEqual(actual, expected)) {
-    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
-  }
-};
-
-// 9. The strict equality assertion tests strict equality, as determined by ===.
-// assert.strictEqual(actual, expected, message_opt);
+function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
+  var indexSize = 1
+  var arrLength = arr.length
+  var valLength = val.length
 
-assert.strictEqual = function strictEqual(actual, expected, message) {
-  if (actual !== expected) {
-    fail(actual, expected, message, '===', assert.strictEqual);
+  if (encoding !== undefined) {
+    encoding = String(encoding).toLowerCase()
+    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
+        encoding === 'utf16le' || encoding === 'utf-16le') {
+      if (arr.length < 2 || val.length < 2) {
+        return -1
+      }
+      indexSize = 2
+      arrLength /= 2
+      valLength /= 2
+      byteOffset /= 2
+    }
   }
-};
 
-// 10. The strict non-equality assertion tests for strict inequality, as
-// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);
-
-assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
-  if (actual === expected) {
-    fail(actual, expected, message, '!==', assert.notStrictEqual);
+  function read (buf, i) {
+    if (indexSize === 1) {
+      return buf[i]
+    } else {
+      return buf.readUInt16BE(i * indexSize)
+    }
   }
-};
 
-function expectedException(actual, expected) {
-  if (!actual || !expected) {
-    return false;
+  var i
+  if (dir) {
+    var foundIndex = -1
+    for (i = byteOffset; i < arrLength; i++) {
+      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
+        if (foundIndex === -1) foundIndex = i
+        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
+      } else {
+        if (foundIndex !== -1) i -= i - foundIndex
+        foundIndex = -1
+      }
+    }
+  } else {
+    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
+    for (i = byteOffset; i >= 0; i--) {
+      var found = true
+      for (var j = 0; j < valLength; j++) {
+        if (read(arr, i + j) !== read(val, j)) {
+          found = false
+          break
+        }
+      }
+      if (found) return i
+    }
   }
 
-  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
-    return expected.test(actual);
-  } else if (actual instanceof expected) {
-    return true;
-  } else if (expected.call({}, actual) === true) {
-    return true;
-  }
+  return -1
+}
 
-  return false;
+Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
+  return this.indexOf(val, byteOffset, encoding) !== -1
 }
 
-function _throws(shouldThrow, block, expected, message) {
-  var actual;
+Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
+  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
+}
 
-  if (util.isString(expected)) {
-    message = expected;
-    expected = null;
-  }
+Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
+  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
+}
 
-  try {
-    block();
-  } catch (e) {
-    actual = e;
+function hexWrite (buf, string, offset, length) {
+  offset = Number(offset) || 0
+  var remaining = buf.length - offset
+  if (!length) {
+    length = remaining
+  } else {
+    length = Number(length)
+    if (length > remaining) {
+      length = remaining
+    }
   }
 
-  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
-            (message ? ' ' + message : '.');
+  // must be an even number of digits
+  var strLen = string.length
+  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
 
-  if (shouldThrow && !actual) {
-    fail(actual, expected, 'Missing expected exception' + message);
+  if (length > strLen / 2) {
+    length = strLen / 2
   }
-
-  if (!shouldThrow && expectedException(actual, expected)) {
-    fail(actual, expected, 'Got unwanted exception' + message);
+  for (var i = 0; i < length; ++i) {
+    var parsed = parseInt(string.substr(i * 2, 2), 16)
+    if (numberIsNaN(parsed)) return i
+    buf[offset + i] = parsed
   }
+  return i
+}
 
-  if ((shouldThrow && actual && expected &&
-      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
-    throw actual;
-  }
+function utf8Write (buf, string, offset, length) {
+  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
 }
 
-// 11. Expected to throw an error:
-// assert.throws(block, Error_opt, message_opt);
+function asciiWrite (buf, string, offset, length) {
+  return blitBuffer(asciiToBytes(string), buf, offset, length)
+}
 
-assert.throws = function(block, /*optional*/error, /*optional*/message) {
-  _throws.apply(this, [true].concat(pSlice.call(arguments)));
-};
+function latin1Write (buf, string, offset, length) {
+  return asciiWrite(buf, string, offset, length)
+}
 
-// EXTENSION! This is annoying to write outside this module.
-assert.doesNotThrow = function(block, /*optional*/message) {
-  _throws.apply(this, [false].concat(pSlice.call(arguments)));
-};
+function base64Write (buf, string, offset, length) {
+  return blitBuffer(base64ToBytes(string), buf, offset, length)
+}
 
-assert.ifError = function(err) { if (err) {throw err;}};
+function ucs2Write (buf, string, offset, length) {
+  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
+}
 
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    if (hasOwn.call(obj, key)) keys.push(key);
+Buffer.prototype.write = function write (string, offset, length, encoding) {
+  // Buffer#write(string)
+  if (offset === undefined) {
+    encoding = 'utf8'
+    length = this.length
+    offset = 0
+  // Buffer#write(string, encoding)
+  } else if (length === undefined && typeof offset === 'string') {
+    encoding = offset
+    length = this.length
+    offset = 0
+  // Buffer#write(string, offset[, length][, encoding])
+  } else if (isFinite(offset)) {
+    offset = offset >>> 0
+    if (isFinite(length)) {
+      length = length >>> 0
+      if (encoding === undefined) encoding = 'utf8'
+    } else {
+      encoding = length
+      length = undefined
+    }
+  } else {
+    throw new Error(
+      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
+    )
   }
-  return keys;
-};
-
-},{"util/":29}],6:[function(require,module,exports){
-
-},{}],7:[function(require,module,exports){
-/*!
- * The buffer module from node.js, for the browser.
- *
- * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
- * @license  MIT
- */
 
-var base64 = require('base64-js')
-var ieee754 = require('ieee754')
-var isArray = require('is-array')
+  var remaining = this.length - offset
+  if (length === undefined || length > remaining) length = remaining
 
-exports.Buffer = Buffer
-exports.SlowBuffer = SlowBuffer
-exports.INSPECT_MAX_BYTES = 50
-Buffer.poolSize = 8192 // not used by this implementation
+  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
+    throw new RangeError('Attempt to write outside buffer bounds')
+  }
 
-var rootParent = {}
+  if (!encoding) encoding = 'utf8'
 
-/**
- * If `Buffer.TYPED_ARRAY_SUPPORT`:
- *   === true    Use Uint8Array implementation (fastest)
- *   === false   Use Object implementation (most compatible, even IE6)
- *
- * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
- * Opera 11.6+, iOS 4.2+.
- *
- * Due to various browser bugs, sometimes the Object implementation will be used even
- * when the browser supports typed arrays.
- *
- * Note:
- *
- *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
- *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
- *
- *   - Safari 5-7 lacks support for changing the `Object.prototype.constructor` property
- *     on objects.
- *
- *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
- *
- *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
- *     incorrect length in some situations.
+  var loweredCase = false
+  for (;;) {
+    switch (encoding) {
+      case 'hex':
+        return hexWrite(this, string, offset, length)
 
- * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
- * get the Object implementation, which is slower but behaves correctly.
- */
-Buffer.TYPED_ARRAY_SUPPORT = (function () {
-  function Bar () {}
-  try {
-    var arr = new Uint8Array(1)
-    arr.foo = function () { return 42 }
-    arr.constructor = Bar
-    return arr.foo() === 42 && // typed array instances can be augmented
-        arr.constructor === Bar && // constructor can be set
-        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
-        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
-  } catch (e) {
-    return false
-  }
-})()
+      case 'utf8':
+      case 'utf-8':
+        return utf8Write(this, string, offset, length)
 
-function kMaxLength () {
-  return Buffer.TYPED_ARRAY_SUPPORT
-    ? 0x7fffffff
-    : 0x3fffffff
-}
+      case 'ascii':
+        return asciiWrite(this, string, offset, length)
 
-/**
- * Class: Buffer
- * =============
- *
- * The Buffer constructor returns instances of `Uint8Array` that are augmented
- * with function properties for all the node `Buffer` API functions. We use
- * `Uint8Array` so that square bracket notation works as expected -- it returns
- * a single octet.
- *
- * By augmenting the instances, we can avoid modifying the `Uint8Array`
- * prototype.
- */
-function Buffer (arg) {
-  if (!(this instanceof Buffer)) {
-    // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
-    if (arguments.length > 1) return new Buffer(arg, arguments[1])
-    return new Buffer(arg)
-  }
+      case 'latin1':
+      case 'binary':
+        return latin1Write(this, string, offset, length)
 
-  this.length = 0
-  this.parent = undefined
+      case 'base64':
+        // Warning: maxLength not taken into account in base64Write
+        return base64Write(this, string, offset, length)
 
-  // Common case.
-  if (typeof arg === 'number') {
-    return fromNumber(this, arg)
-  }
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return ucs2Write(this, string, offset, length)
 
-  // Slightly less common case.
-  if (typeof arg === 'string') {
-    return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
+      default:
+        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
+        encoding = ('' + encoding).toLowerCase()
+        loweredCase = true
+    }
   }
-
-  // Unusual.
-  return fromObject(this, arg)
 }
 
-function fromNumber (that, length) {
-  that = allocate(that, length < 0 ? 0 : checked(length) | 0)
-  if (!Buffer.TYPED_ARRAY_SUPPORT) {
-    for (var i = 0; i < length; i++) {
-      that[i] = 0
-    }
+Buffer.prototype.toJSON = function toJSON () {
+  return {
+    type: 'Buffer',
+    data: Array.prototype.slice.call(this._arr || this, 0)
   }
-  return that
 }
 
-function fromString (that, string, encoding) {
-  if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'
-
-  // Assumption: byteLength() return value is always < kMaxLength.
-  var length = byteLength(string, encoding) | 0
-  that = allocate(that, length)
-
-  that.write(string, encoding)
-  return that
+function base64Slice (buf, start, end) {
+  if (start === 0 && end === buf.length) {
+    return base64.fromByteArray(buf)
+  } else {
+    return base64.fromByteArray(buf.slice(start, end))
+  }
 }
 
-function fromObject (that, object) {
-  if (Buffer.isBuffer(object)) return fromBuffer(that, object)
+function utf8Slice (buf, start, end) {
+  end = Math.min(buf.length, end)
+  var res = []
 
-  if (isArray(object)) return fromArray(that, object)
+  var i = start
+  while (i < end) {
+    var firstByte = buf[i]
+    var codePoint = null
+    var bytesPerSequence = (firstByte > 0xEF) ? 4
+      : (firstByte > 0xDF) ? 3
+      : (firstByte > 0xBF) ? 2
+      : 1
 
-  if (object == null) {
-    throw new TypeError('must start with number, buffer, array or string')
-  }
+    if (i + bytesPerSequence <= end) {
+      var secondByte, thirdByte, fourthByte, tempCodePoint
 
-  if (typeof ArrayBuffer !== 'undefined') {
-    if (object.buffer instanceof ArrayBuffer) {
-      return fromTypedArray(that, object)
+      switch (bytesPerSequence) {
+        case 1:
+          if (firstByte < 0x80) {
+            codePoint = firstByte
+          }
+          break
+        case 2:
+          secondByte = buf[i + 1]
+          if ((secondByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
+            if (tempCodePoint > 0x7F) {
+              codePoint = tempCodePoint
+            }
+          }
+          break
+        case 3:
+          secondByte = buf[i + 1]
+          thirdByte = buf[i + 2]
+          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
+            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
+              codePoint = tempCodePoint
+            }
+          }
+          break
+        case 4:
+          secondByte = buf[i + 1]
+          thirdByte = buf[i + 2]
+          fourthByte = buf[i + 3]
+          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
+            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
+              codePoint = tempCodePoint
+            }
+          }
+      }
     }
-    if (object instanceof ArrayBuffer) {
-      return fromArrayBuffer(that, object)
+
+    if (codePoint === null) {
+      // we did not generate a valid codePoint so insert a
+      // replacement char (U+FFFD) and advance only 1 byte
+      codePoint = 0xFFFD
+      bytesPerSequence = 1
+    } else if (codePoint > 0xFFFF) {
+      // encode to utf16 (surrogate pair dance)
+      codePoint -= 0x10000
+      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
+      codePoint = 0xDC00 | codePoint & 0x3FF
     }
-  }
 
-  if (object.length) return fromArrayLike(that, object)
+    res.push(codePoint)
+    i += bytesPerSequence
+  }
 
-  return fromJsonObject(that, object)
+  return decodeCodePointsArray(res)
 }
 
-function fromBuffer (that, buffer) {
-  var length = checked(buffer.length) | 0
-  that = allocate(that, length)
-  buffer.copy(that, 0, 0, length)
-  return that
-}
+// Based on http://stackoverflow.com/a/22747272/680742, the browser with
+// the lowest limit is Chrome, with 0x10000 args.
+// We go 1 magnitude less, for safety
+var MAX_ARGUMENTS_LENGTH = 0x1000
 
-function fromArray (that, array) {
-  var length = checked(array.length) | 0
-  that = allocate(that, length)
-  for (var i = 0; i < length; i += 1) {
-    that[i] = array[i] & 255
+function decodeCodePointsArray (codePoints) {
+  var len = codePoints.length
+  if (len <= MAX_ARGUMENTS_LENGTH) {
+    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
   }
-  return that
-}
 
-// Duplicate of fromArray() to keep fromArray() monomorphic.
-function fromTypedArray (that, array) {
-  var length = checked(array.length) | 0
-  that = allocate(that, length)
-  // Truncating the elements is probably not what people expect from typed
-  // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
-  // of the old Buffer constructor.
-  for (var i = 0; i < length; i += 1) {
-    that[i] = array[i] & 255
+  // Decode in chunks to avoid "call stack size exceeded".
+  var res = ''
+  var i = 0
+  while (i < len) {
+    res += String.fromCharCode.apply(
+      String,
+      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
+    )
   }
-  return that
+  return res
 }
 
-function fromArrayBuffer (that, array) {
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    // Return an augmented `Uint8Array` instance, for best performance
-    array.byteLength
-    that = Buffer._augment(new Uint8Array(array))
-  } else {
-    // Fallback: Return an object instance of the Buffer class
-    that = fromTypedArray(that, new Uint8Array(array))
+function asciiSlice (buf, start, end) {
+  var ret = ''
+  end = Math.min(buf.length, end)
+
+  for (var i = start; i < end; ++i) {
+    ret += String.fromCharCode(buf[i] & 0x7F)
   }
-  return that
+  return ret
 }
 
-function fromArrayLike (that, array) {
-  var length = checked(array.length) | 0
-  that = allocate(that, length)
-  for (var i = 0; i < length; i += 1) {
-    that[i] = array[i] & 255
+function latin1Slice (buf, start, end) {
+  var ret = ''
+  end = Math.min(buf.length, end)
+
+  for (var i = start; i < end; ++i) {
+    ret += String.fromCharCode(buf[i])
   }
-  return that
+  return ret
 }
 
-// Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
-// Returns a zero-length buffer for inputs that don't conform to the spec.
-function fromJsonObject (that, object) {
-  var array
-  var length = 0
+function hexSlice (buf, start, end) {
+  var len = buf.length
 
-  if (object.type === 'Buffer' && isArray(object.data)) {
-    array = object.data
-    length = checked(array.length) | 0
-  }
-  that = allocate(that, length)
+  if (!start || start < 0) start = 0
+  if (!end || end < 0 || end > len) end = len
 
-  for (var i = 0; i < length; i += 1) {
-    that[i] = array[i] & 255
+  var out = ''
+  for (var i = start; i < end; ++i) {
+    out += toHex(buf[i])
   }
-  return that
+  return out
 }
 
-function allocate (that, length) {
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    // Return an augmented `Uint8Array` instance, for best performance
-    that = Buffer._augment(new Uint8Array(length))
-  } else {
-    // Fallback: Return an object instance of the Buffer class
-    that.length = length
-    that._isBuffer = true
+function utf16leSlice (buf, start, end) {
+  var bytes = buf.slice(start, end)
+  var res = ''
+  for (var i = 0; i < bytes.length; i += 2) {
+    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
   }
-
-  var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
-  if (fromPool) that.parent = rootParent
-
-  return that
-}
-
-function checked (length) {
-  // Note: cannot use `length < kMaxLength` here because that fails when
-  // length is NaN (which is otherwise coerced to zero.)
-  if (length >= kMaxLength()) {
-    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
-                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
-  }
-  return length | 0
-}
-
-function SlowBuffer (subject, encoding) {
-  if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)
-
-  var buf = new Buffer(subject, encoding)
-  delete buf.parent
-  return buf
-}
-
-Buffer.isBuffer = function isBuffer (b) {
-  return !!(b != null && b._isBuffer)
-}
-
-Buffer.compare = function compare (a, b) {
-  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
-    throw new TypeError('Arguments must be Buffers')
-  }
-
-  if (a === b) return 0
-
-  var x = a.length
-  var y = b.length
-
-  var i = 0
-  var len = Math.min(x, y)
-  while (i < len) {
-    if (a[i] !== b[i]) break
-
-    ++i
-  }
-
-  if (i !== len) {
-    x = a[i]
-    y = b[i]
-  }
-
-  if (x < y) return -1
-  if (y < x) return 1
-  return 0
-}
-
-Buffer.isEncoding = function isEncoding (encoding) {
-  switch (String(encoding).toLowerCase()) {
-    case 'hex':
-    case 'utf8':
-    case 'utf-8':
-    case 'ascii':
-    case 'binary':
-    case 'base64':
-    case 'raw':
-    case 'ucs2':
-    case 'ucs-2':
-    case 'utf16le':
-    case 'utf-16le':
-      return true
-    default:
-      return false
-  }
-}
-
-Buffer.concat = function concat (list, length) {
-  if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')
-
-  if (list.length === 0) {
-    return new Buffer(0)
-  }
-
-  var i
-  if (length === undefined) {
-    length = 0
-    for (i = 0; i < list.length; i++) {
-      length += list[i].length
-    }
-  }
-
-  var buf = new Buffer(length)
-  var pos = 0
-  for (i = 0; i < list.length; i++) {
-    var item = list[i]
-    item.copy(buf, pos)
-    pos += item.length
-  }
-  return buf
-}
-
-function byteLength (string, encoding) {
-  if (typeof string !== 'string') string = '' + string
-
-  var len = string.length
-  if (len === 0) return 0
-
-  // Use a for loop to avoid recursion
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'ascii':
-      case 'binary':
-      // Deprecated
-      case 'raw':
-      case 'raws':
-        return len
-      case 'utf8':
-      case 'utf-8':
-        return utf8ToBytes(string).length
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return len * 2
-      case 'hex':
-        return len >>> 1
-      case 'base64':
-        return base64ToBytes(string).length
-      default:
-        if (loweredCase) return utf8ToBytes(string).length // assume utf8
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-Buffer.byteLength = byteLength
-
-// pre-set for values that may exist in the future
-Buffer.prototype.length = undefined
-Buffer.prototype.parent = undefined
-
-function slowToString (encoding, start, end) {
-  var loweredCase = false
-
-  start = start | 0
-  end = end === undefined || end === Infinity ? this.length : end | 0
-
-  if (!encoding) encoding = 'utf8'
-  if (start < 0) start = 0
-  if (end > this.length) end = this.length
-  if (end <= start) return ''
-
-  while (true) {
-    switch (encoding) {
-      case 'hex':
-        return hexSlice(this, start, end)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Slice(this, start, end)
-
-      case 'ascii':
-        return asciiSlice(this, start, end)
-
-      case 'binary':
-        return binarySlice(this, start, end)
-
-      case 'base64':
-        return base64Slice(this, start, end)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return utf16leSlice(this, start, end)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = (encoding + '').toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-Buffer.prototype.toString = function toString () {
-  var length = this.length | 0
-  if (length === 0) return ''
-  if (arguments.length === 0) return utf8Slice(this, 0, length)
-  return slowToString.apply(this, arguments)
-}
-
-Buffer.prototype.equals = function equals (b) {
-  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-  if (this === b) return true
-  return Buffer.compare(this, b) === 0
-}
-
-Buffer.prototype.inspect = function inspect () {
-  var str = ''
-  var max = exports.INSPECT_MAX_BYTES
-  if (this.length > 0) {
-    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
-    if (this.length > max) str += ' ... '
-  }
-  return '<Buffer ' + str + '>'
-}
-
-Buffer.prototype.compare = function compare (b) {
-  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-  if (this === b) return 0
-  return Buffer.compare(this, b)
-}
-
-Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
-  if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
-  else if (byteOffset < -0x80000000) byteOffset = -0x80000000
-  byteOffset >>= 0
-
-  if (this.length === 0) return -1
-  if (byteOffset >= this.length) return -1
-
-  // Negative offsets start from the end of the buffer
-  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)
-
-  if (typeof val === 'string') {
-    if (val.length === 0) return -1 // special case: looking for empty string always fails
-    return String.prototype.indexOf.call(this, val, byteOffset)
-  }
-  if (Buffer.isBuffer(val)) {
-    return arrayIndexOf(this, val, byteOffset)
-  }
-  if (typeof val === 'number') {
-    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
-      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
-    }
-    return arrayIndexOf(this, [ val ], byteOffset)
-  }
-
-  function arrayIndexOf (arr, val, byteOffset) {
-    var foundIndex = -1
-    for (var i = 0; byteOffset + i < arr.length; i++) {
-      if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
-        if (foundIndex === -1) foundIndex = i
-        if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
-      } else {
-        foundIndex = -1
-      }
-    }
-    return -1
-  }
-
-  throw new TypeError('val must be string, number or Buffer')
-}
-
-// `get` is deprecated
-Buffer.prototype.get = function get (offset) {
-  console.log('.get() is deprecated. Access using array indexes instead.')
-  return this.readUInt8(offset)
-}
-
-// `set` is deprecated
-Buffer.prototype.set = function set (v, offset) {
-  console.log('.set() is deprecated. Access using array indexes instead.')
-  return this.writeUInt8(v, offset)
-}
-
-function hexWrite (buf, string, offset, length) {
-  offset = Number(offset) || 0
-  var remaining = buf.length - offset
-  if (!length) {
-    length = remaining
-  } else {
-    length = Number(length)
-    if (length > remaining) {
-      length = remaining
-    }
-  }
-
-  // must be an even number of digits
-  var strLen = string.length
-  if (strLen % 2 !== 0) throw new Error('Invalid hex string')
-
-  if (length > strLen / 2) {
-    length = strLen / 2
-  }
-  for (var i = 0; i < length; i++) {
-    var parsed = parseInt(string.substr(i * 2, 2), 16)
-    if (isNaN(parsed)) throw new Error('Invalid hex string')
-    buf[offset + i] = parsed
-  }
-  return i
-}
-
-function utf8Write (buf, string, offset, length) {
-  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-function asciiWrite (buf, string, offset, length) {
-  return blitBuffer(asciiToBytes(string), buf, offset, length)
-}
-
-function binaryWrite (buf, string, offset, length) {
-  return asciiWrite(buf, string, offset, length)
-}
-
-function base64Write (buf, string, offset, length) {
-  return blitBuffer(base64ToBytes(string), buf, offset, length)
-}
-
-function ucs2Write (buf, string, offset, length) {
-  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-Buffer.prototype.write = function write (string, offset, length, encoding) {
-  // Buffer#write(string)
-  if (offset === undefined) {
-    encoding = 'utf8'
-    length = this.length
-    offset = 0
-  // Buffer#write(string, encoding)
-  } else if (length === undefined && typeof offset === 'string') {
-    encoding = offset
-    length = this.length
-    offset = 0
-  // Buffer#write(string, offset[, length][, encoding])
-  } else if (isFinite(offset)) {
-    offset = offset | 0
-    if (isFinite(length)) {
-      length = length | 0
-      if (encoding === undefined) encoding = 'utf8'
-    } else {
-      encoding = length
-      length = undefined
-    }
-  // legacy write(string, encoding, offset, length) - remove in v0.13
-  } else {
-    var swap = encoding
-    encoding = offset
-    offset = length | 0
-    length = swap
-  }
-
-  var remaining = this.length - offset
-  if (length === undefined || length > remaining) length = remaining
-
-  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-    throw new RangeError('attempt to write outside buffer bounds')
-  }
-
-  if (!encoding) encoding = 'utf8'
-
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'hex':
-        return hexWrite(this, string, offset, length)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Write(this, string, offset, length)
-
-      case 'ascii':
-        return asciiWrite(this, string, offset, length)
-
-      case 'binary':
-        return binaryWrite(this, string, offset, length)
-
-      case 'base64':
-        // Warning: maxLength not taken into account in base64Write
-        return base64Write(this, string, offset, length)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return ucs2Write(this, string, offset, length)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-Buffer.prototype.toJSON = function toJSON () {
-  return {
-    type: 'Buffer',
-    data: Array.prototype.slice.call(this._arr || this, 0)
-  }
-}
-
-function base64Slice (buf, start, end) {
-  if (start === 0 && end === buf.length) {
-    return base64.fromByteArray(buf)
-  } else {
-    return base64.fromByteArray(buf.slice(start, end))
-  }
-}
-
-function utf8Slice (buf, start, end) {
-  end = Math.min(buf.length, end)
-  var firstByte
-  var secondByte
-  var thirdByte
-  var fourthByte
-  var bytesPerSequence
-  var tempCodePoint
-  var codePoint
-  var res = []
-  var i = start
-
-  for (; i < end; i += bytesPerSequence) {
-    firstByte = buf[i]
-    codePoint = 0xFFFD
-
-    if (firstByte > 0xEF) {
-      bytesPerSequence = 4
-    } else if (firstByte > 0xDF) {
-      bytesPerSequence = 3
-    } else if (firstByte > 0xBF) {
-      bytesPerSequence = 2
-    } else {
-      bytesPerSequence = 1
-    }
-
-    if (i + bytesPerSequence <= end) {
-      switch (bytesPerSequence) {
-        case 1:
-          if (firstByte < 0x80) {
-            codePoint = firstByte
-          }
-          break
-        case 2:
-          secondByte = buf[i + 1]
-          if ((secondByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
-            if (tempCodePoint > 0x7F) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 3:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
-            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 4:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          fourthByte = buf[i + 3]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
-            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
-              codePoint = tempCodePoint
-            }
-          }
-      }
-    }
-
-    if (codePoint === 0xFFFD) {
-      // we generated an invalid codePoint so make sure to only advance by 1 byte
-      bytesPerSequence = 1
-    } else if (codePoint > 0xFFFF) {
-      // encode to utf16 (surrogate pair dance)
-      codePoint -= 0x10000
-      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
-      codePoint = 0xDC00 | codePoint & 0x3FF
-    }
-
-    res.push(codePoint)
-  }
-
-  return String.fromCharCode.apply(String, res)
-}
-
-function asciiSlice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; i++) {
-    ret += String.fromCharCode(buf[i] & 0x7F)
-  }
-  return ret
-}
-
-function binarySlice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; i++) {
-    ret += String.fromCharCode(buf[i])
-  }
-  return ret
-}
-
-function hexSlice (buf, start, end) {
-  var len = buf.length
-
-  if (!start || start < 0) start = 0
-  if (!end || end < 0 || end > len) end = len
-
-  var out = ''
-  for (var i = start; i < end; i++) {
-    out += toHex(buf[i])
-  }
-  return out
-}
-
-function utf16leSlice (buf, start, end) {
-  var bytes = buf.slice(start, end)
-  var res = ''
-  for (var i = 0; i < bytes.length; i += 2) {
-    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
-  }
-  return res
+  return res
 }
 
 Buffer.prototype.slice = function slice (start, end) {
@@ -10019,19 +8922,9 @@ Buffer.prototype.slice = function slice (start, end) {
 
   if (end < start) end = start
 
-  var newBuf
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    newBuf = Buffer._augment(this.subarray(start, end))
-  } else {
-    var sliceLen = end - start
-    newBuf = new Buffer(sliceLen, undefined)
-    for (var i = 0; i < sliceLen; i++) {
-      newBuf[i] = this[i + start]
-    }
-  }
-
-  if (newBuf.length) newBuf.parent = this.parent || this
-
+  var newBuf = this.subarray(start, end)
+  // Return an augmented `Uint8Array` instance
+  newBuf.__proto__ = Buffer.prototype
   return newBuf
 }
 
@@ -10044,8 +8937,8 @@ function checkOffset (offset, ext, length) {
 }
 
 Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
-  offset = offset | 0
-  byteLength = byteLength | 0
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
   if (!noAssert) checkOffset(offset, byteLength, this.length)
 
   var val = this[offset]
@@ -10059,8 +8952,8 @@ Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert)
 }
 
 Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
-  offset = offset | 0
-  byteLength = byteLength | 0
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
   if (!noAssert) {
     checkOffset(offset, byteLength, this.length)
   }
@@ -10075,21 +8968,25 @@ Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert)
 }
 
 Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 1, this.length)
   return this[offset]
 }
 
 Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 2, this.length)
   return this[offset] | (this[offset + 1] << 8)
 }
 
 Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 2, this.length)
   return (this[offset] << 8) | this[offset + 1]
 }
 
 Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
 
   return ((this[offset]) |
@@ -10099,6 +8996,7 @@ Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
 }
 
 Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
 
   return (this[offset] * 0x1000000) +
@@ -10108,8 +9006,8 @@ Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
 }
 
 Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
-  offset = offset | 0
-  byteLength = byteLength | 0
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
   if (!noAssert) checkOffset(offset, byteLength, this.length)
 
   var val = this[offset]
@@ -10126,8 +9024,8 @@ Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
 }
 
 Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
-  offset = offset | 0
-  byteLength = byteLength | 0
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
   if (!noAssert) checkOffset(offset, byteLength, this.length)
 
   var i = byteLength
@@ -10144,24 +9042,28 @@ Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
 }
 
 Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 1, this.length)
   if (!(this[offset] & 0x80)) return (this[offset])
   return ((0xff - this[offset] + 1) * -1)
 }
 
 Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 2, this.length)
   var val = this[offset] | (this[offset + 1] << 8)
   return (val & 0x8000) ? val | 0xFFFF0000 : val
 }
 
 Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 2, this.length)
   var val = this[offset + 1] | (this[offset] << 8)
   return (val & 0x8000) ? val | 0xFFFF0000 : val
 }
 
 Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
 
   return (this[offset]) |
@@ -10171,6 +9073,7 @@ Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
 }
 
 Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
 
   return (this[offset] << 24) |
@@ -10180,36 +9083,43 @@ Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
 }
 
 Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
   return ieee754.read(this, offset, true, 23, 4)
 }
 
 Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 4, this.length)
   return ieee754.read(this, offset, false, 23, 4)
 }
 
 Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 8, this.length)
   return ieee754.read(this, offset, true, 52, 8)
 }
 
 Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
+  offset = offset >>> 0
   if (!noAssert) checkOffset(offset, 8, this.length)
   return ieee754.read(this, offset, false, 52, 8)
 }
 
 function checkInt (buf, value, offset, ext, max, min) {
-  if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
-  if (value > max || value < min) throw new RangeError('value is out of bounds')
-  if (offset + ext > buf.length) throw new RangeError('index out of range')
+  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
+  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
+  if (offset + ext > buf.length) throw new RangeError('Index out of range')
 }
 
 Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
   value = +value
-  offset = offset | 0
-  byteLength = byteLength | 0
-  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) {
+    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+    checkInt(this, value, offset, byteLength, maxBytes, 0)
+  }
 
   var mul = 1
   var i = 0
@@ -10223,9 +9133,12 @@ Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength,
 
 Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
   value = +value
-  offset = offset | 0
-  byteLength = byteLength | 0
-  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) {
+    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+    checkInt(this, value, offset, byteLength, maxBytes, 0)
+  }
 
   var i = byteLength - 1
   var mul = 1
@@ -10239,98 +9152,69 @@ Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength,
 
 Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
-  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
-  this[offset] = value
+  this[offset] = (value & 0xff)
   return offset + 1
 }
 
-function objectWriteUInt16 (buf, value, offset, littleEndian) {
-  if (value < 0) value = 0xffff + value + 1
-  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
-    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
-      (littleEndian ? i : 1 - i) * 8
-  }
-}
-
 Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = value
-    this[offset + 1] = (value >>> 8)
-  } else {
-    objectWriteUInt16(this, value, offset, true)
-  }
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
   return offset + 2
 }
 
 Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = (value >>> 8)
-    this[offset + 1] = value
-  } else {
-    objectWriteUInt16(this, value, offset, false)
-  }
+  this[offset] = (value >>> 8)
+  this[offset + 1] = (value & 0xff)
   return offset + 2
 }
 
-function objectWriteUInt32 (buf, value, offset, littleEndian) {
-  if (value < 0) value = 0xffffffff + value + 1
-  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
-    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
-  }
-}
-
 Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset + 3] = (value >>> 24)
-    this[offset + 2] = (value >>> 16)
-    this[offset + 1] = (value >>> 8)
-    this[offset] = value
-  } else {
-    objectWriteUInt32(this, value, offset, true)
-  }
+  this[offset + 3] = (value >>> 24)
+  this[offset + 2] = (value >>> 16)
+  this[offset + 1] = (value >>> 8)
+  this[offset] = (value & 0xff)
   return offset + 4
 }
 
 Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = (value >>> 24)
-    this[offset + 1] = (value >>> 16)
-    this[offset + 2] = (value >>> 8)
-    this[offset + 3] = value
-  } else {
-    objectWriteUInt32(this, value, offset, false)
-  }
+  this[offset] = (value >>> 24)
+  this[offset + 1] = (value >>> 16)
+  this[offset + 2] = (value >>> 8)
+  this[offset + 3] = (value & 0xff)
   return offset + 4
 }
 
 Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) {
-    var limit = Math.pow(2, 8 * byteLength - 1)
+    var limit = Math.pow(2, (8 * byteLength) - 1)
 
     checkInt(this, value, offset, byteLength, limit - 1, -limit)
   }
 
   var i = 0
   var mul = 1
-  var sub = value < 0 ? 1 : 0
+  var sub = 0
   this[offset] = value & 0xFF
   while (++i < byteLength && (mul *= 0x100)) {
+    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
+      sub = 1
+    }
     this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
   }
 
@@ -10339,18 +9223,21 @@ Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, no
 
 Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) {
-    var limit = Math.pow(2, 8 * byteLength - 1)
+    var limit = Math.pow(2, (8 * byteLength) - 1)
 
     checkInt(this, value, offset, byteLength, limit - 1, -limit)
   }
 
   var i = byteLength - 1
   var mul = 1
-  var sub = value < 0 ? 1 : 0
+  var sub = 0
   this[offset + i] = value & 0xFF
   while (--i >= 0 && (mul *= 0x100)) {
+    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
+      sub = 1
+    }
     this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
   }
 
@@ -10359,78 +9246,62 @@ Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, no
 
 Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
-  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
   if (value < 0) value = 0xff + value + 1
-  this[offset] = value
+  this[offset] = (value & 0xff)
   return offset + 1
 }
 
 Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = value
-    this[offset + 1] = (value >>> 8)
-  } else {
-    objectWriteUInt16(this, value, offset, true)
-  }
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
   return offset + 2
 }
 
 Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = (value >>> 8)
-    this[offset + 1] = value
-  } else {
-    objectWriteUInt16(this, value, offset, false)
-  }
+  this[offset] = (value >>> 8)
+  this[offset + 1] = (value & 0xff)
   return offset + 2
 }
 
 Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = value
-    this[offset + 1] = (value >>> 8)
-    this[offset + 2] = (value >>> 16)
-    this[offset + 3] = (value >>> 24)
-  } else {
-    objectWriteUInt32(this, value, offset, true)
-  }
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
+  this[offset + 2] = (value >>> 16)
+  this[offset + 3] = (value >>> 24)
   return offset + 4
 }
 
 Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
   value = +value
-  offset = offset | 0
+  offset = offset >>> 0
   if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
   if (value < 0) value = 0xffffffff + value + 1
-  if (Buffer.TYPED_ARRAY_SUPPORT) {
-    this[offset] = (value >>> 24)
-    this[offset + 1] = (value >>> 16)
-    this[offset + 2] = (value >>> 8)
-    this[offset + 3] = value
-  } else {
-    objectWriteUInt32(this, value, offset, false)
-  }
+  this[offset] = (value >>> 24)
+  this[offset + 1] = (value >>> 16)
+  this[offset + 2] = (value >>> 8)
+  this[offset + 3] = (value & 0xff)
   return offset + 4
 }
 
 function checkIEEE754 (buf, value, offset, ext, max, min) {
-  if (value > max || value < min) throw new RangeError('value is out of bounds')
-  if (offset + ext > buf.length) throw new RangeError('index out of range')
-  if (offset < 0) throw new RangeError('index out of range')
+  if (offset + ext > buf.length) throw new RangeError('Index out of range')
+  if (offset < 0) throw new RangeError('Index out of range')
 }
 
 function writeFloat (buf, value, offset, littleEndian, noAssert) {
+  value = +value
+  offset = offset >>> 0
   if (!noAssert) {
     checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
   }
@@ -10447,6 +9318,8 @@ Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert)
 }
 
 function writeDouble (buf, value, offset, littleEndian, noAssert) {
+  value = +value
+  offset = offset >>> 0
   if (!noAssert) {
     checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
   }
@@ -10492,148 +9365,96 @@ Buffer.prototype.copy = function copy (target, targetStart, start, end) {
 
   if (this === target && start < targetStart && targetStart < end) {
     // descending copy from end
-    for (i = len - 1; i >= 0; i--) {
+    for (i = len - 1; i >= 0; --i) {
       target[i + targetStart] = this[i + start]
     }
-  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
+  } else if (len < 1000) {
     // ascending copy from start
-    for (i = 0; i < len; i++) {
+    for (i = 0; i < len; ++i) {
       target[i + targetStart] = this[i + start]
     }
   } else {
-    target._set(this.subarray(start, start + len), targetStart)
+    Uint8Array.prototype.set.call(
+      target,
+      this.subarray(start, start + len),
+      targetStart
+    )
   }
 
   return len
 }
 
-// fill(value, start=0, end=buffer.length)
-Buffer.prototype.fill = function fill (value, start, end) {
-  if (!value) value = 0
-  if (!start) start = 0
-  if (!end) end = this.length
+// Usage:
+//    buffer.fill(number[, offset[, end]])
+//    buffer.fill(buffer[, offset[, end]])
+//    buffer.fill(string[, offset[, end]][, encoding])
+Buffer.prototype.fill = function fill (val, start, end, encoding) {
+  // Handle string cases:
+  if (typeof val === 'string') {
+    if (typeof start === 'string') {
+      encoding = start
+      start = 0
+      end = this.length
+    } else if (typeof end === 'string') {
+      encoding = end
+      end = this.length
+    }
+    if (val.length === 1) {
+      var code = val.charCodeAt(0)
+      if (code < 256) {
+        val = code
+      }
+    }
+    if (encoding !== undefined && typeof encoding !== 'string') {
+      throw new TypeError('encoding must be a string')
+    }
+    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
+      throw new TypeError('Unknown encoding: ' + encoding)
+    }
+  } else if (typeof val === 'number') {
+    val = val & 255
+  }
 
-  if (end < start) throw new RangeError('end < start')
+  // Invalid ranges are not set to a default, so can range check early.
+  if (start < 0 || this.length < start || this.length < end) {
+    throw new RangeError('Out of range index')
+  }
+
+  if (end <= start) {
+    return this
+  }
 
-  // Fill 0 bytes; we're done
-  if (end === start) return
-  if (this.length === 0) return
+  start = start >>> 0
+  end = end === undefined ? this.length : end >>> 0
 
-  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
-  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')
+  if (!val) val = 0
 
   var i
-  if (typeof value === 'number') {
-    for (i = start; i < end; i++) {
-      this[i] = value
+  if (typeof val === 'number') {
+    for (i = start; i < end; ++i) {
+      this[i] = val
     }
   } else {
-    var bytes = utf8ToBytes(value.toString())
+    var bytes = Buffer.isBuffer(val)
+      ? val
+      : new Buffer(val, encoding)
     var len = bytes.length
-    for (i = start; i < end; i++) {
-      this[i] = bytes[i % len]
+    for (i = 0; i < end - start; ++i) {
+      this[i + start] = bytes[i % len]
     }
   }
 
   return this
 }
 
-/**
- * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
- * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
- */
-Buffer.prototype.toArrayBuffer = function toArrayBuffer () {
-  if (typeof Uint8Array !== 'undefined') {
-    if (Buffer.TYPED_ARRAY_SUPPORT) {
-      return (new Buffer(this)).buffer
-    } else {
-      var buf = new Uint8Array(this.length)
-      for (var i = 0, len = buf.length; i < len; i += 1) {
-        buf[i] = this[i]
-      }
-      return buf.buffer
-    }
-  } else {
-    throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
-  }
-}
-
 // HELPER FUNCTIONS
 // ================
 
-var BP = Buffer.prototype
-
-/**
- * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
- */
-Buffer._augment = function _augment (arr) {
-  arr.constructor = Buffer
-  arr._isBuffer = true
-
-  // save reference to original Uint8Array set method before overwriting
-  arr._set = arr.set
-
-  // deprecated
-  arr.get = BP.get
-  arr.set = BP.set
-
-  arr.write = BP.write
-  arr.toString = BP.toString
-  arr.toLocaleString = BP.toString
-  arr.toJSON = BP.toJSON
-  arr.equals = BP.equals
-  arr.compare = BP.compare
-  arr.indexOf = BP.indexOf
-  arr.copy = BP.copy
-  arr.slice = BP.slice
-  arr.readUIntLE = BP.readUIntLE
-  arr.readUIntBE = BP.readUIntBE
-  arr.readUInt8 = BP.readUInt8
-  arr.readUInt16LE = BP.readUInt16LE
-  arr.readUInt16BE = BP.readUInt16BE
-  arr.readUInt32LE = BP.readUInt32LE
-  arr.readUInt32BE = BP.readUInt32BE
-  arr.readIntLE = BP.readIntLE
-  arr.readIntBE = BP.readIntBE
-  arr.readInt8 = BP.readInt8
-  arr.readInt16LE = BP.readInt16LE
-  arr.readInt16BE = BP.readInt16BE
-  arr.readInt32LE = BP.readInt32LE
-  arr.readInt32BE = BP.readInt32BE
-  arr.readFloatLE = BP.readFloatLE
-  arr.readFloatBE = BP.readFloatBE
-  arr.readDoubleLE = BP.readDoubleLE
-  arr.readDoubleBE = BP.readDoubleBE
-  arr.writeUInt8 = BP.writeUInt8
-  arr.writeUIntLE = BP.writeUIntLE
-  arr.writeUIntBE = BP.writeUIntBE
-  arr.writeUInt16LE = BP.writeUInt16LE
-  arr.writeUInt16BE = BP.writeUInt16BE
-  arr.writeUInt32LE = BP.writeUInt32LE
-  arr.writeUInt32BE = BP.writeUInt32BE
-  arr.writeIntLE = BP.writeIntLE
-  arr.writeIntBE = BP.writeIntBE
-  arr.writeInt8 = BP.writeInt8
-  arr.writeInt16LE = BP.writeInt16LE
-  arr.writeInt16BE = BP.writeInt16BE
-  arr.writeInt32LE = BP.writeInt32LE
-  arr.writeInt32BE = BP.writeInt32BE
-  arr.writeFloatLE = BP.writeFloatLE
-  arr.writeFloatBE = BP.writeFloatBE
-  arr.writeDoubleLE = BP.writeDoubleLE
-  arr.writeDoubleBE = BP.writeDoubleBE
-  arr.fill = BP.fill
-  arr.inspect = BP.inspect
-  arr.toArrayBuffer = BP.toArrayBuffer
-
-  return arr
-}
-
-var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
+var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
 
 function base64clean (str) {
   // Node strips out invalid characters like \n and \t from the string, base64-js does not
-  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
+  str = str.trim().replace(INVALID_BASE64_RE, '')
   // Node converts strings with length < 2 to ''
   if (str.length < 2) return ''
   // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
@@ -10643,11 +9464,6 @@ function base64clean (str) {
   return str
 }
 
-function stringtrim (str) {
-  if (str.trim) return str.trim()
-  return str.replace(/^\s+|\s+$/g, '')
-}
-
 function toHex (n) {
   if (n < 16) return '0' + n.toString(16)
   return n.toString(16)
@@ -10660,7 +9476,7 @@ function utf8ToBytes (string, units) {
   var leadSurrogate = null
   var bytes = []
 
-  for (var i = 0; i < length; i++) {
+  for (var i = 0; i < length; ++i) {
     codePoint = string.charCodeAt(i)
 
     // is surrogate component
@@ -10672,7 +9488,6 @@ function utf8ToBytes (string, units) {
           // unexpected trail
           if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
           continue
-
         } else if (i + 1 === length) {
           // unpaired lead
           if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
@@ -10693,8 +9508,7 @@ function utf8ToBytes (string, units) {
       }
 
       // valid surrogate pair
-      codePoint = leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00 | 0x10000
-
+      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
     } else if (leadSurrogate) {
       // valid bmp char, but last char was a lead
       if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
@@ -10737,7 +9551,7 @@ function utf8ToBytes (string, units) {
 
 function asciiToBytes (str) {
   var byteArray = []
-  for (var i = 0; i < str.length; i++) {
+  for (var i = 0; i < str.length; ++i) {
     // Node's code seems to be doing this and not & 0x7F..
     byteArray.push(str.charCodeAt(i) & 0xFF)
   }
@@ -10747,7 +9561,7 @@ function asciiToBytes (str) {
 function utf16leToBytes (str, units) {
   var c, hi, lo
   var byteArray = []
-  for (var i = 0; i < str.length; i++) {
+  for (var i = 0; i < str.length; ++i) {
     if ((units -= 2) < 0) break
 
     c = str.charCodeAt(i)
@@ -10765,261 +9579,134 @@ function base64ToBytes (str) {
 }
 
 function blitBuffer (src, dst, offset, length) {
-  for (var i = 0; i < length; i++) {
+  for (var i = 0; i < length; ++i) {
     if ((i + offset >= dst.length) || (i >= src.length)) break
     dst[i + offset] = src[i]
   }
   return i
 }
 
-},{"base64-js":8,"ieee754":9,"is-array":10}],8:[function(require,module,exports){
-var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
-
-;(function (exports) {
-	'use strict';
-
-  var Arr = (typeof Uint8Array !== 'undefined')
-    ? Uint8Array
-    : Array
-
-	var PLUS   = '+'.charCodeAt(0)
-	var SLASH  = '/'.charCodeAt(0)
-	var NUMBER = '0'.charCodeAt(0)
-	var LOWER  = 'a'.charCodeAt(0)
-	var UPPER  = 'A'.charCodeAt(0)
-	var PLUS_URL_SAFE = '-'.charCodeAt(0)
-	var SLASH_URL_SAFE = '_'.charCodeAt(0)
-
-	function decode (elt) {
-		var code = elt.charCodeAt(0)
-		if (code === PLUS ||
-		    code === PLUS_URL_SAFE)
-			return 62 // '+'
-		if (code === SLASH ||
-		    code === SLASH_URL_SAFE)
-			return 63 // '/'
-		if (code < NUMBER)
-			return -1 //no match
-		if (code < NUMBER + 10)
-			return code - NUMBER + 26 + 26
-		if (code < UPPER + 26)
-			return code - UPPER
-		if (code < LOWER + 26)
-			return code - LOWER + 26
-	}
-
-	function b64ToByteArray (b64) {
-		var i, j, l, tmp, placeHolders, arr
-
-		if (b64.length % 4 > 0) {
-			throw new Error('Invalid string. Length must be a multiple of 4')
-		}
-
-		// the number of equal signs (place holders)
-		// if there are two placeholders, than the two characters before it
-		// represent one byte
-		// if there is only one, then the three characters before it represent 2 bytes
-		// this is just a cheap hack to not do indexOf twice
-		var len = b64.length
-		placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0
-
-		// base64 is 4/3 + up to two characters of the original data
-		arr = new Arr(b64.length * 3 / 4 - placeHolders)
-
-		// if there are placeholders, only get up to the last complete 4 chars
-		l = placeHolders > 0 ? b64.length - 4 : b64.length
-
-		var L = 0
-
-		function push (v) {
-			arr[L++] = v
-		}
-
-		for (i = 0, j = 0; i < l; i += 4, j += 3) {
-			tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
-			push((tmp & 0xFF0000) >> 16)
-			push((tmp & 0xFF00) >> 8)
-			push(tmp & 0xFF)
-		}
-
-		if (placeHolders === 2) {
-			tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
-			push(tmp & 0xFF)
-		} else if (placeHolders === 1) {
-			tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
-			push((tmp >> 8) & 0xFF)
-			push(tmp & 0xFF)
-		}
-
-		return arr
-	}
-
-	function uint8ToBase64 (uint8) {
-		var i,
-			extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
-			output = "",
-			temp, length
-
-		function encode (num) {
-			return lookup.charAt(num)
-		}
-
-		function tripletToBase64 (num) {
-			return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
-		}
-
-		// go through the array every three bytes, we'll deal with trailing stuff later
-		for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
-			temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
-			output += tripletToBase64(temp)
-		}
-
-		// pad the end with zeros, but make sure to not forget the extra bytes
-		switch (extraBytes) {
-			case 1:
-				temp = uint8[uint8.length - 1]
-				output += encode(temp >> 2)
-				output += encode((temp << 4) & 0x3F)
-				output += '=='
-				break
-			case 2:
-				temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
-				output += encode(temp >> 10)
-				output += encode((temp >> 4) & 0x3F)
-				output += encode((temp << 2) & 0x3F)
-				output += '='
-				break
-		}
-
-		return output
-	}
-
-	exports.toByteArray = b64ToByteArray
-	exports.fromByteArray = uint8ToBase64
-}(typeof exports === 'undefined' ? (this.base64js = {}) : exports))
-
-},{}],9:[function(require,module,exports){
-exports.read = function (buffer, offset, isLE, mLen, nBytes) {
-  var e, m
-  var eLen = nBytes * 8 - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var nBits = -7
-  var i = isLE ? (nBytes - 1) : 0
-  var d = isLE ? -1 : 1
-  var s = buffer[offset + i]
+// Node 0.10 supports `ArrayBuffer` but lacks `ArrayBuffer.isView`
+function isArrayBufferView (obj) {
+  return (typeof ArrayBuffer.isView === 'function') && ArrayBuffer.isView(obj)
+}
 
-  i += d
+function numberIsNaN (obj) {
+  return obj !== obj // eslint-disable-line no-self-compare
+}
 
-  e = s & ((1 << (-nBits)) - 1)
-  s >>= (-nBits)
-  nBits += eLen
-  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+},{"base64-js":2,"ieee754":7}],5:[function(require,module,exports){
+(function (Buffer){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-  m = e & ((1 << (-nBits)) - 1)
-  e >>= (-nBits)
-  nBits += mLen
-  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
 
-  if (e === 0) {
-    e = 1 - eBias
-  } else if (e === eMax) {
-    return m ? NaN : ((s ? -1 : 1) * Infinity)
-  } else {
-    m = m + Math.pow(2, mLen)
-    e = e - eBias
+function isArray(arg) {
+  if (Array.isArray) {
+    return Array.isArray(arg);
   }
-  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
+  return objectToString(arg) === '[object Array]';
 }
+exports.isArray = isArray;
 
-exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
-  var e, m, c
-  var eLen = nBytes * 8 - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
-  var i = isLE ? 0 : (nBytes - 1)
-  var d = isLE ? 1 : -1
-  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
 
-  value = Math.abs(value)
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
 
-  if (isNaN(value) || value === Infinity) {
-    m = isNaN(value) ? 1 : 0
-    e = eMax
-  } else {
-    e = Math.floor(Math.log(value) / Math.LN2)
-    if (value * (c = Math.pow(2, -e)) < 1) {
-      e--
-      c *= 2
-    }
-    if (e + eBias >= 1) {
-      value += rt / c
-    } else {
-      value += rt * Math.pow(2, 1 - eBias)
-    }
-    if (value * c >= 2) {
-      e++
-      c /= 2
-    }
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
 
-    if (e + eBias >= eMax) {
-      m = 0
-      e = eMax
-    } else if (e + eBias >= 1) {
-      m = (value * c - 1) * Math.pow(2, mLen)
-      e = e + eBias
-    } else {
-      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
-      e = 0
-    }
-  }
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
 
-  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
 
-  e = (e << mLen) | m
-  eLen += mLen
-  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
 
-  buffer[offset + i - d] |= s * 128
+function isUndefined(arg) {
+  return arg === void 0;
 }
+exports.isUndefined = isUndefined;
 
-},{}],10:[function(require,module,exports){
+function isRegExp(re) {
+  return objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
 
-/**
- * isArray
- */
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
 
-var isArray = Array.isArray;
+function isDate(d) {
+  return objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
 
-/**
- * toString
- */
+function isError(e) {
+  return (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
 
-var str = Object.prototype.toString;
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
 
-/**
- * Whether or not the given `val`
- * is an array.
- *
- * example:
- *
- *        isArray([]);
- *        // > true
- *        isArray(arguments);
- *        // > false
- *        isArray('');
- *        // > false
- *
- * @param {mixed} val
- * @return {bool}
- */
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
 
-module.exports = isArray || function (val) {
-  return !! val && '[object Array]' == str.call(val);
-};
+exports.isBuffer = Buffer.isBuffer;
 
-},{}],11:[function(require,module,exports){
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
+}
+
+}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
+},{"../../is-buffer/index.js":9}],6:[function(require,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -11079,8 +9766,12 @@ EventEmitter.prototype.emit = function(type) {
       er = arguments[1];
       if (er instanceof Error) {
         throw er; // Unhandled 'error' event
+      } else {
+        // At least give some kind of context to the user
+        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
+        err.context = er;
+        throw err;
       }
-      throw TypeError('Uncaught, unspecified "error" event.');
     }
   }
 
@@ -11103,18 +9794,11 @@ EventEmitter.prototype.emit = function(type) {
         break;
       // slower
       default:
-        len = arguments.length;
-        args = new Array(len - 1);
-        for (i = 1; i < len; i++)
-          args[i - 1] = arguments[i];
+        args = Array.prototype.slice.call(arguments, 1);
         handler.apply(this, args);
     }
   } else if (isObject(handler)) {
-    len = arguments.length;
-    args = new Array(len - 1);
-    for (i = 1; i < len; i++)
-      args[i - 1] = arguments[i];
-
+    args = Array.prototype.slice.call(arguments, 1);
     listeners = handler.slice();
     len = listeners.length;
     for (i = 0; i < len; i++)
@@ -11152,7 +9836,6 @@ EventEmitter.prototype.addListener = function(type, listener) {
 
   // Check for listener leak
   if (isObject(this._events[type]) && !this._events[type].warned) {
-    var m;
     if (!isUndefined(this._maxListeners)) {
       m = this._maxListeners;
     } else {
@@ -11274,7 +9957,7 @@ EventEmitter.prototype.removeAllListeners = function(type) {
 
   if (isFunction(listeners)) {
     this.removeListener(type, listeners);
-  } else {
+  } else if (listeners) {
     // LIFO order
     while (listeners.length)
       this.removeListener(type, listeners[listeners.length - 1]);
@@ -11295,15 +9978,20 @@ EventEmitter.prototype.listeners = function(type) {
   return ret;
 };
 
+EventEmitter.prototype.listenerCount = function(type) {
+  if (this._events) {
+    var evlistener = this._events[type];
+
+    if (isFunction(evlistener))
+      return 1;
+    else if (evlistener)
+      return evlistener.length;
+  }
+  return 0;
+};
+
 EventEmitter.listenerCount = function(emitter, type) {
-  var ret;
-  if (!emitter._events || !emitter._events[type])
-    ret = 0;
-  else if (isFunction(emitter._events[type]))
-    ret = 1;
-  else
-    ret = emitter._events[type].length;
-  return ret;
+  return emitter.listenerCount(type);
 };
 
 function isFunction(arg) {
@@ -11322,7 +10010,93 @@ function isUndefined(arg) {
   return arg === void 0;
 }
 
-},{}],12:[function(require,module,exports){
+},{}],7:[function(require,module,exports){
+exports.read = function (buffer, offset, isLE, mLen, nBytes) {
+  var e, m
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var nBits = -7
+  var i = isLE ? (nBytes - 1) : 0
+  var d = isLE ? -1 : 1
+  var s = buffer[offset + i]
+
+  i += d
+
+  e = s & ((1 << (-nBits)) - 1)
+  s >>= (-nBits)
+  nBits += eLen
+  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  m = e & ((1 << (-nBits)) - 1)
+  e >>= (-nBits)
+  nBits += mLen
+  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  if (e === 0) {
+    e = 1 - eBias
+  } else if (e === eMax) {
+    return m ? NaN : ((s ? -1 : 1) * Infinity)
+  } else {
+    m = m + Math.pow(2, mLen)
+    e = e - eBias
+  }
+  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
+}
+
+exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
+  var e, m, c
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
+  var i = isLE ? 0 : (nBytes - 1)
+  var d = isLE ? 1 : -1
+  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
+
+  value = Math.abs(value)
+
+  if (isNaN(value) || value === Infinity) {
+    m = isNaN(value) ? 1 : 0
+    e = eMax
+  } else {
+    e = Math.floor(Math.log(value) / Math.LN2)
+    if (value * (c = Math.pow(2, -e)) < 1) {
+      e--
+      c *= 2
+    }
+    if (e + eBias >= 1) {
+      value += rt / c
+    } else {
+      value += rt * Math.pow(2, 1 - eBias)
+    }
+    if (value * c >= 2) {
+      e++
+      c /= 2
+    }
+
+    if (e + eBias >= eMax) {
+      m = 0
+      e = eMax
+    } else if (e + eBias >= 1) {
+      m = (value * c - 1) * Math.pow(2, mLen)
+      e = e + eBias
+    } else {
+      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
+      e = 0
+    }
+  }
+
+  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+
+  e = (e << mLen) | m
+  eLen += mLen
+  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+
+  buffer[offset + i - d] |= s * 128
+}
+
+},{}],8:[function(require,module,exports){
 if (typeof Object.create === 'function') {
   // implementation from standard node.js 'util' module
   module.exports = function inherits(ctor, superCtor) {
@@ -11347,70 +10121,233 @@ if (typeof Object.create === 'function') {
   }
 }
 
-},{}],13:[function(require,module,exports){
-module.exports = Array.isArray || function (arr) {
-  return Object.prototype.toString.call(arr) == '[object Array]';
-};
-
-},{}],14:[function(require,module,exports){
-// shim for using process in browser
-
-var process = module.exports = {};
-var queue = [];
-var draining = false;
-var currentQueue;
-var queueIndex = -1;
+},{}],9:[function(require,module,exports){
+/*!
+ * Determine if an object is a Buffer
+ *
+ * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
+ * @license  MIT
+ */
 
-function cleanUpNextTick() {
-    draining = false;
-    if (currentQueue.length) {
-        queue = currentQueue.concat(queue);
-    } else {
-        queueIndex = -1;
-    }
-    if (queue.length) {
-        drainQueue();
-    }
+// The _isBuffer check is for Safari 5-7 support, because it's missing
+// Object.prototype.constructor. Remove this eventually
+module.exports = function (obj) {
+  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
 }
 
-function drainQueue() {
-    if (draining) {
-        return;
-    }
-    var timeout = setTimeout(cleanUpNextTick);
-    draining = true;
+function isBuffer (obj) {
+  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
+}
 
-    var len = queue.length;
-    while(len) {
-        currentQueue = queue;
-        queue = [];
-        while (++queueIndex < len) {
-            currentQueue[queueIndex].run();
-        }
-        queueIndex = -1;
-        len = queue.length;
-    }
-    currentQueue = null;
-    draining = false;
-    clearTimeout(timeout);
+// For Node v0.10 support. Remove this eventually.
+function isSlowBuffer (obj) {
+  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
 }
 
-process.nextTick = function (fun) {
-    var args = new Array(arguments.length - 1);
-    if (arguments.length > 1) {
-        for (var i = 1; i < arguments.length; i++) {
-            args[i - 1] = arguments[i];
-        }
-    }
-    queue.push(new Item(fun, args));
-    if (queue.length === 1 && !draining) {
-        setTimeout(drainQueue, 0);
-    }
+},{}],10:[function(require,module,exports){
+var toString = {}.toString;
+
+module.exports = Array.isArray || function (arr) {
+  return toString.call(arr) == '[object Array]';
 };
 
-// v8 likes predictible objects
-function Item(fun, array) {
-    this.fun = fun;
+},{}],11:[function(require,module,exports){
+(function (process){
+'use strict';
+
+if (!process.version ||
+    process.version.indexOf('v0.') === 0 ||
+    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
+  module.exports = nextTick;
+} else {
+  module.exports = process.nextTick;
+}
+
+function nextTick(fn, arg1, arg2, arg3) {
+  if (typeof fn !== 'function') {
+    throw new TypeError('"callback" argument must be a function');
+  }
+  var len = arguments.length;
+  var args, i;
+  switch (len) {
+  case 0:
+  case 1:
+    return process.nextTick(fn);
+  case 2:
+    return process.nextTick(function afterTickOne() {
+      fn.call(null, arg1);
+    });
+  case 3:
+    return process.nextTick(function afterTickTwo() {
+      fn.call(null, arg1, arg2);
+    });
+  case 4:
+    return process.nextTick(function afterTickThree() {
+      fn.call(null, arg1, arg2, arg3);
+    });
+  default:
+    args = new Array(len - 1);
+    i = 0;
+    while (i < args.length) {
+      args[i++] = arguments[i];
+    }
+    return process.nextTick(function afterTick() {
+      fn.apply(null, args);
+    });
+  }
+}
+
+}).call(this,require('_process'))
+},{"_process":12}],12:[function(require,module,exports){
+// shim for using process in browser
+var process = module.exports = {};
+
+// cached from whatever global is present so that test runners that stub it
+// don't break things.  But we need to wrap it in a try catch in case it is
+// wrapped in strict mode code which doesn't define any globals.  It's inside a
+// function because try/catches deoptimize in certain engines.
+
+var cachedSetTimeout;
+var cachedClearTimeout;
+
+function defaultSetTimout() {
+    throw new Error('setTimeout has not been defined');
+}
+function defaultClearTimeout () {
+    throw new Error('clearTimeout has not been defined');
+}
+(function () {
+    try {
+        if (typeof setTimeout === 'function') {
+            cachedSetTimeout = setTimeout;
+        } else {
+            cachedSetTimeout = defaultSetTimout;
+        }
+    } catch (e) {
+        cachedSetTimeout = defaultSetTimout;
+    }
+    try {
+        if (typeof clearTimeout === 'function') {
+            cachedClearTimeout = clearTimeout;
+        } else {
+            cachedClearTimeout = defaultClearTimeout;
+        }
+    } catch (e) {
+        cachedClearTimeout = defaultClearTimeout;
+    }
+} ())
+function runTimeout(fun) {
+    if (cachedSetTimeout === setTimeout) {
+        //normal enviroments in sane situations
+        return setTimeout(fun, 0);
+    }
+    // if setTimeout wasn't available but was latter defined
+    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
+        cachedSetTimeout = setTimeout;
+        return setTimeout(fun, 0);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedSetTimeout(fun, 0);
+    } catch(e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
+            return cachedSetTimeout.call(null, fun, 0);
+        } catch(e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
+            return cachedSetTimeout.call(this, fun, 0);
+        }
+    }
+
+
+}
+function runClearTimeout(marker) {
+    if (cachedClearTimeout === clearTimeout) {
+        //normal enviroments in sane situations
+        return clearTimeout(marker);
+    }
+    // if clearTimeout wasn't available but was latter defined
+    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
+        cachedClearTimeout = clearTimeout;
+        return clearTimeout(marker);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedClearTimeout(marker);
+    } catch (e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
+            return cachedClearTimeout.call(null, marker);
+        } catch (e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
+            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
+            return cachedClearTimeout.call(this, marker);
+        }
+    }
+
+
+
+}
+var queue = [];
+var draining = false;
+var currentQueue;
+var queueIndex = -1;
+
+function cleanUpNextTick() {
+    if (!draining || !currentQueue) {
+        return;
+    }
+    draining = false;
+    if (currentQueue.length) {
+        queue = currentQueue.concat(queue);
+    } else {
+        queueIndex = -1;
+    }
+    if (queue.length) {
+        drainQueue();
+    }
+}
+
+function drainQueue() {
+    if (draining) {
+        return;
+    }
+    var timeout = runTimeout(cleanUpNextTick);
+    draining = true;
+
+    var len = queue.length;
+    while(len) {
+        currentQueue = queue;
+        queue = [];
+        while (++queueIndex < len) {
+            if (currentQueue) {
+                currentQueue[queueIndex].run();
+            }
+        }
+        queueIndex = -1;
+        len = queue.length;
+    }
+    currentQueue = null;
+    draining = false;
+    runClearTimeout(timeout);
+}
+
+process.nextTick = function (fun) {
+    var args = new Array(arguments.length - 1);
+    if (arguments.length > 1) {
+        for (var i = 1; i < arguments.length; i++) {
+            args[i - 1] = arguments[i];
+        }
+    }
+    queue.push(new Item(fun, args));
+    if (queue.length === 1 && !draining) {
+        runTimeout(drainQueue);
+    }
+};
+
+// v8 likes predictible objects
+function Item(fun, array) {
+    this.fun = fun;
     this.array = array;
 }
 Item.prototype.run = function () {
@@ -11432,23 +10369,25 @@ process.off = noop;
 process.removeListener = noop;
 process.removeAllListeners = noop;
 process.emit = noop;
+process.prependListener = noop;
+process.prependOnceListener = noop;
+
+process.listeners = function (name) { return [] }
 
 process.binding = function (name) {
     throw new Error('process.binding is not supported');
 };
 
-// TODO(shtylman)
 process.cwd = function () { return '/' };
 process.chdir = function (dir) {
     throw new Error('process.chdir is not supported');
 };
 process.umask = function() { return 0; };
 
-},{}],15:[function(require,module,exports){
-module.exports = require("./lib/_stream_duplex.js")
+},{}],13:[function(require,module,exports){
+module.exports = require('./lib/_stream_duplex.js');
 
-},{"./lib/_stream_duplex.js":16}],16:[function(require,module,exports){
-(function (process){
+},{"./lib/_stream_duplex.js":14}],14:[function(require,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -11475,16 +10414,23 @@ module.exports = require("./lib/_stream_duplex.js")
 // prototypally inherits from Readable, and then parasitically from
 // Writable.
 
-module.exports = Duplex;
+'use strict';
+
+/*<replacement>*/
+
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
 
 /*<replacement>*/
 var objectKeys = Object.keys || function (obj) {
   var keys = [];
-  for (var key in obj) keys.push(key);
-  return keys;
-}
+  for (var key in obj) {
+    keys.push(key);
+  }return keys;
+};
 /*</replacement>*/
 
+module.exports = Duplex;
 
 /*<replacement>*/
 var util = require('core-util-is');
@@ -11496,27 +10442,24 @@ var Writable = require('./_stream_writable');
 
 util.inherits(Duplex, Readable);
 
-forEach(objectKeys(Writable.prototype), function(method) {
-  if (!Duplex.prototype[method])
-    Duplex.prototype[method] = Writable.prototype[method];
-});
+var keys = objectKeys(Writable.prototype);
+for (var v = 0; v < keys.length; v++) {
+  var method = keys[v];
+  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
+}
 
 function Duplex(options) {
-  if (!(this instanceof Duplex))
-    return new Duplex(options);
+  if (!(this instanceof Duplex)) return new Duplex(options);
 
   Readable.call(this, options);
   Writable.call(this, options);
 
-  if (options && options.readable === false)
-    this.readable = false;
+  if (options && options.readable === false) this.readable = false;
 
-  if (options && options.writable === false)
-    this.writable = false;
+  if (options && options.writable === false) this.writable = false;
 
   this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false)
-    this.allowHalfOpen = false;
+  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
 
   this.once('end', onend);
 }
@@ -11525,22 +10468,51 @@ function Duplex(options) {
 function onend() {
   // if we allow half-open state, or if the writable side ended,
   // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended)
-    return;
+  if (this.allowHalfOpen || this._writableState.ended) return;
 
   // no more data can be written.
   // But allow more writes to happen in this tick.
-  process.nextTick(this.end.bind(this));
+  processNextTick(onEndNT, this);
+}
+
+function onEndNT(self) {
+  self.end();
 }
 
-function forEach (xs, f) {
+Object.defineProperty(Duplex.prototype, 'destroyed', {
+  get: function () {
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed && this._writableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._readableState.destroyed = value;
+    this._writableState.destroyed = value;
+  }
+});
+
+Duplex.prototype._destroy = function (err, cb) {
+  this.push(null);
+  this.end();
+
+  processNextTick(cb, err);
+};
+
+function forEach(xs, f) {
   for (var i = 0, l = xs.length; i < l; i++) {
     f(xs[i], i);
   }
 }
-
-}).call(this,require('_process'))
-},{"./_stream_readable":18,"./_stream_writable":20,"_process":14,"core-util-is":21,"inherits":12}],17:[function(require,module,exports){
+},{"./_stream_readable":16,"./_stream_writable":18,"core-util-is":5,"inherits":8,"process-nextick-args":11}],15:[function(require,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -11566,6 +10538,8 @@ function forEach (xs, f) {
 // basically just the most minimal sort of Transform stream.
 // Every written chunk gets output as-is.
 
+'use strict';
+
 module.exports = PassThrough;
 
 var Transform = require('./_stream_transform');
@@ -11578,18 +10552,16 @@ util.inherits = require('inherits');
 util.inherits(PassThrough, Transform);
 
 function PassThrough(options) {
-  if (!(this instanceof PassThrough))
-    return new PassThrough(options);
+  if (!(this instanceof PassThrough)) return new PassThrough(options);
 
   Transform.call(this, options);
 }
 
-PassThrough.prototype._transform = function(chunk, encoding, cb) {
+PassThrough.prototype._transform = function (chunk, encoding, cb) {
   cb(null, chunk);
 };
-
-},{"./_stream_transform":19,"core-util-is":21,"inherits":12}],18:[function(require,module,exports){
-(function (process){
+},{"./_stream_transform":17,"core-util-is":5,"inherits":8}],16:[function(require,module,exports){
+(function (process,global){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -11611,64 +10583,111 @@ PassThrough.prototype._transform = function(chunk, encoding, cb) {
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+'use strict';
+
+/*<replacement>*/
+
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
+
 module.exports = Readable;
 
 /*<replacement>*/
 var isArray = require('isarray');
 /*</replacement>*/
 
-
 /*<replacement>*/
-var Buffer = require('buffer').Buffer;
+var Duplex;
 /*</replacement>*/
 
 Readable.ReadableState = ReadableState;
 
+/*<replacement>*/
 var EE = require('events').EventEmitter;
 
-/*<replacement>*/
-if (!EE.listenerCount) EE.listenerCount = function(emitter, type) {
+var EElistenerCount = function (emitter, type) {
   return emitter.listeners(type).length;
 };
 /*</replacement>*/
 
-var Stream = require('stream');
+/*<replacement>*/
+var Stream = require('./internal/streams/stream');
+/*</replacement>*/
+
+// TODO(bmeurer): Change this back to const once hole checks are
+// properly optimized away early in Ignition+TurboFan.
+/*<replacement>*/
+var Buffer = require('safe-buffer').Buffer;
+var OurUint8Array = global.Uint8Array || function () {};
+function _uint8ArrayToBuffer(chunk) {
+  return Buffer.from(chunk);
+}
+function _isUint8Array(obj) {
+  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
+}
+/*</replacement>*/
 
 /*<replacement>*/
 var util = require('core-util-is');
 util.inherits = require('inherits');
 /*</replacement>*/
 
-var StringDecoder;
-
-
 /*<replacement>*/
-var debug = require('util');
-if (debug && debug.debuglog) {
-  debug = debug.debuglog('stream');
+var debugUtil = require('util');
+var debug = void 0;
+if (debugUtil && debugUtil.debuglog) {
+  debug = debugUtil.debuglog('stream');
 } else {
   debug = function () {};
 }
 /*</replacement>*/
 
+var BufferList = require('./internal/streams/BufferList');
+var destroyImpl = require('./internal/streams/destroy');
+var StringDecoder;
 
 util.inherits(Readable, Stream);
 
+var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
+
+function prependListener(emitter, event, fn) {
+  // Sadly this is not cacheable as some libraries bundle their own
+  // event emitter implementation with them.
+  if (typeof emitter.prependListener === 'function') {
+    return emitter.prependListener(event, fn);
+  } else {
+    // This is a hack to make sure that our error handler is attached before any
+    // userland ones.  NEVER DO THIS. This is here only because this code needs
+    // to continue to work with older versions of Node.js that do not include
+    // the prependListener() method. The goal is to eventually remove this hack.
+    if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
+  }
+}
+
 function ReadableState(options, stream) {
-  var Duplex = require('./_stream_duplex');
+  Duplex = Duplex || require('./_stream_duplex');
 
   options = options || {};
 
+  // object stream flag. Used to make read(n) ignore n and to
+  // make all the buffer merging and length checks go away
+  this.objectMode = !!options.objectMode;
+
+  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
+
   // the point at which it stops calling _read() to fill the buffer
   // Note: 0 is a valid value, means "don't call _read preemptively ever"
   var hwm = options.highWaterMark;
-  var defaultHwm = options.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.floor(this.highWaterMark);
 
-  this.buffer = [];
+  // A linked list is used to store data chunks instead of an array because the
+  // linked list can remove elements from the beginning faster than
+  // array.shift()
+  this.buffer = new BufferList();
   this.length = 0;
   this.pipes = null;
   this.pipesCount = 0;
@@ -11677,10 +10696,10 @@ function ReadableState(options, stream) {
   this.endEmitted = false;
   this.reading = false;
 
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
+  // a flag to be able to tell if the event 'readable'/'data' is emitted
+  // immediately, or on a later tick.  We set this to true at first, because
+  // any actions that shouldn't happen until "later" should generally also
+  // not happen before the first read call.
   this.sync = true;
 
   // whenever we return null, then we set a flag to say
@@ -11688,24 +10707,16 @@ function ReadableState(options, stream) {
   this.needReadable = false;
   this.emittedReadable = false;
   this.readableListening = false;
+  this.resumeScheduled = false;
 
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex)
-    this.objectMode = this.objectMode || !!options.readableObjectMode;
+  // has it been destroyed
+  this.destroyed = false;
 
   // Crypto is kind of old and crusty.  Historically, its default string
   // encoding is 'binary' so we have to make this configurable.
   // Everything else in the universe uses 'utf8', though.
   this.defaultEncoding = options.defaultEncoding || 'utf8';
 
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
-
   // the number of writers that are awaiting a drain event in .pipe()s
   this.awaitDrain = 0;
 
@@ -11715,99 +10726,144 @@ function ReadableState(options, stream) {
   this.decoder = null;
   this.encoding = null;
   if (options.encoding) {
-    if (!StringDecoder)
-      StringDecoder = require('string_decoder/').StringDecoder;
+    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
     this.decoder = new StringDecoder(options.encoding);
     this.encoding = options.encoding;
   }
 }
 
 function Readable(options) {
-  var Duplex = require('./_stream_duplex');
+  Duplex = Duplex || require('./_stream_duplex');
 
-  if (!(this instanceof Readable))
-    return new Readable(options);
+  if (!(this instanceof Readable)) return new Readable(options);
 
   this._readableState = new ReadableState(options, this);
 
   // legacy
   this.readable = true;
 
+  if (options) {
+    if (typeof options.read === 'function') this._read = options.read;
+
+    if (typeof options.destroy === 'function') this._destroy = options.destroy;
+  }
+
   Stream.call(this);
 }
 
+Object.defineProperty(Readable.prototype, 'destroyed', {
+  get: function () {
+    if (this._readableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (!this._readableState) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._readableState.destroyed = value;
+  }
+});
+
+Readable.prototype.destroy = destroyImpl.destroy;
+Readable.prototype._undestroy = destroyImpl.undestroy;
+Readable.prototype._destroy = function (err, cb) {
+  this.push(null);
+  cb(err);
+};
+
 // Manually shove something into the read() buffer.
 // This returns true if the highWaterMark has not been hit yet,
 // similar to how Writable.write() returns true if you should
 // write() some more.
-Readable.prototype.push = function(chunk, encoding) {
+Readable.prototype.push = function (chunk, encoding) {
   var state = this._readableState;
-
-  if (util.isString(chunk) && !state.objectMode) {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = new Buffer(chunk, encoding);
-      encoding = '';
+  var skipChunkCheck;
+
+  if (!state.objectMode) {
+    if (typeof chunk === 'string') {
+      encoding = encoding || state.defaultEncoding;
+      if (encoding !== state.encoding) {
+        chunk = Buffer.from(chunk, encoding);
+        encoding = '';
+      }
+      skipChunkCheck = true;
     }
+  } else {
+    skipChunkCheck = true;
   }
 
-  return readableAddChunk(this, state, chunk, encoding, false);
+  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
 };
 
 // Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function(chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
+Readable.prototype.unshift = function (chunk) {
+  return readableAddChunk(this, chunk, null, true, false);
 };
 
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (util.isNullOrUndefined(chunk)) {
+function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
+  var state = stream._readableState;
+  if (chunk === null) {
     state.reading = false;
-    if (!state.ended)
-      onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var e = new Error('stream.unshift() after end event');
-      stream.emit('error', e);
-    } else {
-      if (state.decoder && !addToFront && !encoding)
-        chunk = state.decoder.write(chunk);
-
-      if (!addToFront)
-        state.reading = false;
+    onEofChunk(stream, state);
+  } else {
+    var er;
+    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
+    if (er) {
+      stream.emit('error', er);
+    } else if (state.objectMode || chunk && chunk.length > 0) {
+      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
+        chunk = _uint8ArrayToBuffer(chunk);
+      }
 
-      // if we want the data now, just emit it.
-      if (state.flowing && state.length === 0 && !state.sync) {
-        stream.emit('data', chunk);
-        stream.read(0);
+      if (addToFront) {
+        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
+      } else if (state.ended) {
+        stream.emit('error', new Error('stream.push() after EOF'));
       } else {
-        // update the buffer info.
-        state.length += state.objectMode ? 1 : chunk.length;
-        if (addToFront)
-          state.buffer.unshift(chunk);
-        else
-          state.buffer.push(chunk);
-
-        if (state.needReadable)
-          emitReadable(stream);
+        state.reading = false;
+        if (state.decoder && !encoding) {
+          chunk = state.decoder.write(chunk);
+          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
+        } else {
+          addChunk(stream, state, chunk, false);
+        }
       }
-
-      maybeReadMore(stream, state);
+    } else if (!addToFront) {
+      state.reading = false;
     }
-  } else if (!addToFront) {
-    state.reading = false;
   }
 
   return needMoreData(state);
 }
 
+function addChunk(stream, state, chunk, addToFront) {
+  if (state.flowing && state.length === 0 && !state.sync) {
+    stream.emit('data', chunk);
+    stream.read(0);
+  } else {
+    // update the buffer info.
+    state.length += state.objectMode ? 1 : chunk.length;
+    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
+
+    if (state.needReadable) emitReadable(stream);
+  }
+  maybeReadMore(stream, state);
+}
 
+function chunkInvalid(state, chunk) {
+  var er;
+  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
+    er = new TypeError('Invalid non-string/buffer chunk');
+  }
+  return er;
+}
 
 // if it's past the high water mark, we can push in some more.
 // Also, if we have no data yet, we can stand some
@@ -11817,92 +10873,75 @@ function readableAddChunk(stream, state, chunk, encoding, addToFront) {
 // needReadable was set, then we ought to push more, so that another
 // 'readable' event will be triggered.
 function needMoreData(state) {
-  return !state.ended &&
-         (state.needReadable ||
-          state.length < state.highWaterMark ||
-          state.length === 0);
+  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
 }
 
+Readable.prototype.isPaused = function () {
+  return this._readableState.flowing === false;
+};
+
 // backwards compatibility.
-Readable.prototype.setEncoding = function(enc) {
-  if (!StringDecoder)
-    StringDecoder = require('string_decoder/').StringDecoder;
+Readable.prototype.setEncoding = function (enc) {
+  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
   this._readableState.decoder = new StringDecoder(enc);
   this._readableState.encoding = enc;
   return this;
 };
 
-// Don't raise the hwm > 128MB
+// Don't raise the hwm > 8MB
 var MAX_HWM = 0x800000;
-function roundUpToNextPowerOf2(n) {
+function computeNewHighWaterMark(n) {
   if (n >= MAX_HWM) {
     n = MAX_HWM;
   } else {
-    // Get the next highest power of 2
+    // Get the next highest power of 2 to prevent increasing hwm excessively in
+    // tiny amounts
     n--;
-    for (var p = 1; p < 32; p <<= 1) n |= n >> p;
+    n |= n >>> 1;
+    n |= n >>> 2;
+    n |= n >>> 4;
+    n |= n >>> 8;
+    n |= n >>> 16;
     n++;
   }
   return n;
 }
 
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
 function howMuchToRead(n, state) {
-  if (state.length === 0 && state.ended)
-    return 0;
-
-  if (state.objectMode)
-    return n === 0 ? 0 : 1;
-
-  if (isNaN(n) || util.isNull(n)) {
-    // only flow one buffer at a time
-    if (state.flowing && state.buffer.length)
-      return state.buffer[0].length;
-    else
-      return state.length;
+  if (n <= 0 || state.length === 0 && state.ended) return 0;
+  if (state.objectMode) return 1;
+  if (n !== n) {
+    // Only flow one buffer at a time
+    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
   }
-
-  if (n <= 0)
+  // If we're asking for more than the current hwm, then raise the hwm.
+  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
+  if (n <= state.length) return n;
+  // Don't have enough
+  if (!state.ended) {
+    state.needReadable = true;
     return 0;
-
-  // If we're asking for more than the target buffer level,
-  // then raise the water mark.  Bump up to the next highest
-  // power of 2, to prevent increasing it excessively in tiny
-  // amounts.
-  if (n > state.highWaterMark)
-    state.highWaterMark = roundUpToNextPowerOf2(n);
-
-  // don't have that much.  return null, unless we've ended.
-  if (n > state.length) {
-    if (!state.ended) {
-      state.needReadable = true;
-      return 0;
-    } else
-      return state.length;
   }
-
-  return n;
+  return state.length;
 }
 
 // you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function(n) {
+Readable.prototype.read = function (n) {
   debug('read', n);
+  n = parseInt(n, 10);
   var state = this._readableState;
   var nOrig = n;
 
-  if (!util.isNumber(n) || n > 0)
-    state.emittedReadable = false;
+  if (n !== 0) state.emittedReadable = false;
 
   // if we're doing read(0) to trigger a readable event, but we
   // already have a bunch of data in the buffer, then just trigger
   // the 'readable' event and move on.
-  if (n === 0 &&
-      state.needReadable &&
-      (state.length >= state.highWaterMark || state.ended)) {
+  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
     debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended)
-      endReadable(this);
-    else
-      emitReadable(this);
+    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
     return null;
   }
 
@@ -11910,8 +10949,7 @@ Readable.prototype.read = function(n) {
 
   // if we've ended, and we're now clear, then finish it up.
   if (n === 0 && state.ended) {
-    if (state.length === 0)
-      endReadable(this);
+    if (state.length === 0) endReadable(this);
     return null;
   }
 
@@ -11952,67 +10990,47 @@ Readable.prototype.read = function(n) {
   if (state.ended || state.reading) {
     doRead = false;
     debug('reading or ended', doRead);
-  }
-
-  if (doRead) {
+  } else if (doRead) {
     debug('do read');
     state.reading = true;
     state.sync = true;
     // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0)
-      state.needReadable = true;
+    if (state.length === 0) state.needReadable = true;
     // call internal read method
     this._read(state.highWaterMark);
     state.sync = false;
+    // If _read pushed data synchronously, then `reading` will be false,
+    // and we need to re-evaluate how much data we can return to the user.
+    if (!state.reading) n = howMuchToRead(nOrig, state);
   }
 
-  // If _read pushed data synchronously, then `reading` will be false,
-  // and we need to re-evaluate how much data we can return to the user.
-  if (doRead && !state.reading)
-    n = howMuchToRead(nOrig, state);
-
   var ret;
-  if (n > 0)
-    ret = fromList(n, state);
-  else
-    ret = null;
+  if (n > 0) ret = fromList(n, state);else ret = null;
 
-  if (util.isNull(ret)) {
+  if (ret === null) {
     state.needReadable = true;
     n = 0;
+  } else {
+    state.length -= n;
   }
 
-  state.length -= n;
-
-  // If we have nothing in the buffer, then we want to know
-  // as soon as we *do* get something into the buffer.
-  if (state.length === 0 && !state.ended)
-    state.needReadable = true;
+  if (state.length === 0) {
+    // If we have nothing in the buffer, then we want to know
+    // as soon as we *do* get something into the buffer.
+    if (!state.ended) state.needReadable = true;
 
-  // If we tried to read() past the EOF, then emit end on the next tick.
-  if (nOrig !== n && state.ended && state.length === 0)
-    endReadable(this);
+    // If we tried to read() past the EOF, then emit end on the next tick.
+    if (nOrig !== n && state.ended) endReadable(this);
+  }
 
-  if (!util.isNull(ret))
-    this.emit('data', ret);
+  if (ret !== null) this.emit('data', ret);
 
   return ret;
 };
 
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!util.isBuffer(chunk) &&
-      !util.isString(chunk) &&
-      !util.isNullOrUndefined(chunk) &&
-      !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-
 function onEofChunk(stream, state) {
-  if (state.decoder && !state.ended) {
+  if (state.ended) return;
+  if (state.decoder) {
     var chunk = state.decoder.end();
     if (chunk && chunk.length) {
       state.buffer.push(chunk);
@@ -12034,12 +11052,7 @@ function emitReadable(stream) {
   if (!state.emittedReadable) {
     debug('emitReadable', state.flowing);
     state.emittedReadable = true;
-    if (state.sync)
-      process.nextTick(function() {
-        emitReadable_(stream);
-      });
-    else
-      emitReadable_(stream);
+    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
   }
 }
 
@@ -12049,7 +11062,6 @@ function emitReadable_(stream) {
   flow(stream);
 }
 
-
 // at this point, the user has presumably seen the 'readable' event,
 // and called read() to consume some data.  that may have triggered
 // in turn another _read(n) call, in which case reading = true if
@@ -12059,23 +11071,18 @@ function emitReadable_(stream) {
 function maybeReadMore(stream, state) {
   if (!state.readingMore) {
     state.readingMore = true;
-    process.nextTick(function() {
-      maybeReadMore_(stream, state);
-    });
+    processNextTick(maybeReadMore_, stream, state);
   }
 }
 
 function maybeReadMore_(stream, state) {
   var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended &&
-         state.length < state.highWaterMark) {
+  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
     debug('maybeReadMore read 0');
     stream.read(0);
     if (len === state.length)
       // didn't get any data, stop spinning.
-      break;
-    else
-      len = state.length;
+      break;else len = state.length;
   }
   state.readingMore = false;
 }
@@ -12084,11 +11091,11 @@ function maybeReadMore_(stream, state) {
 // call cb(er, data) where data is <= n in length.
 // for virtual (non-string, non-buffer) streams, "length" is somewhat
 // arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function(n) {
-  this.emit('error', new Error('not implemented'));
+Readable.prototype._read = function (n) {
+  this.emit('error', new Error('_read() is not implemented'));
 };
 
-Readable.prototype.pipe = function(dest, pipeOpts) {
+Readable.prototype.pipe = function (dest, pipeOpts) {
   var src = this;
   var state = this._readableState;
 
@@ -12106,21 +11113,19 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
   state.pipesCount += 1;
   debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
 
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) &&
-              dest !== process.stdout &&
-              dest !== process.stderr;
+  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
 
-  var endFn = doEnd ? onend : cleanup;
-  if (state.endEmitted)
-    process.nextTick(endFn);
-  else
-    src.once('end', endFn);
+  var endFn = doEnd ? onend : unpipe;
+  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
 
   dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
+  function onunpipe(readable, unpipeInfo) {
     debug('onunpipe');
     if (readable === src) {
-      cleanup();
+      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
+        unpipeInfo.hasUnpiped = true;
+        cleanup();
+      }
     }
   }
 
@@ -12136,6 +11141,7 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
   var ondrain = pipeOnDrain(src);
   dest.on('drain', ondrain);
 
+  var cleanedUp = false;
   function cleanup() {
     debug('cleanup');
     // cleanup event handlers once the pipe is broken
@@ -12145,27 +11151,39 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
     dest.removeListener('error', onerror);
     dest.removeListener('unpipe', onunpipe);
     src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
+    src.removeListener('end', unpipe);
     src.removeListener('data', ondata);
 
+    cleanedUp = true;
+
     // if the reader is waiting for a drain event from this
     // specific writer, then it would cause it to never start
     // flowing again.
     // So, if this is awaiting a drain, then we just call it now.
     // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain &&
-        (!dest._writableState || dest._writableState.needDrain))
-      ondrain();
+    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
   }
 
+  // If the user pushes more data while we're writing to dest then we'll end up
+  // in ondata again. However, we only want to increase awaitDrain once because
+  // dest will only emit one 'drain' event for the multiple writes.
+  // => Introduce a guard on increasing awaitDrain.
+  var increasedAwaitDrain = false;
   src.on('data', ondata);
   function ondata(chunk) {
     debug('ondata');
+    increasedAwaitDrain = false;
     var ret = dest.write(chunk);
-    if (false === ret) {
-      debug('false write response, pause',
-            src._readableState.awaitDrain);
-      src._readableState.awaitDrain++;
+    if (false === ret && !increasedAwaitDrain) {
+      // If the user unpiped during `dest.write()`, it is possible
+      // to get stuck in a permanently paused state if that write
+      // also returned false.
+      // => Check whether `dest` is still a piping destination.
+      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
+        debug('false write response, pause', src._readableState.awaitDrain);
+        src._readableState.awaitDrain++;
+        increasedAwaitDrain = true;
+      }
       src.pause();
     }
   }
@@ -12176,19 +11194,11 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
     debug('onerror', er);
     unpipe();
     dest.removeListener('error', onerror);
-    if (EE.listenerCount(dest, 'error') === 0)
-      dest.emit('error', er);
-  }
-  // This is a brutally ugly hack to make sure that our error handler
-  // is attached before any userland ones.  NEVER DO THIS.
-  if (!dest._events || !dest._events.error)
-    dest.on('error', onerror);
-  else if (isArray(dest._events.error))
-    dest._events.error.unshift(onerror);
-  else
-    dest._events.error = [onerror, dest._events.error];
-
+    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
+  }
 
+  // Make sure our error handler is attached before userland ones.
+  prependListener(dest, 'error', onerror);
 
   // Both close and finish should trigger unpipe, but only once.
   function onclose() {
@@ -12221,41 +11231,36 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
 };
 
 function pipeOnDrain(src) {
-  return function() {
+  return function () {
     var state = src._readableState;
     debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain)
-      state.awaitDrain--;
-    if (state.awaitDrain === 0 && EE.listenerCount(src, 'data')) {
+    if (state.awaitDrain) state.awaitDrain--;
+    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
       state.flowing = true;
       flow(src);
     }
   };
 }
 
-
-Readable.prototype.unpipe = function(dest) {
+Readable.prototype.unpipe = function (dest) {
   var state = this._readableState;
+  var unpipeInfo = { hasUnpiped: false };
 
   // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0)
-    return this;
+  if (state.pipesCount === 0) return this;
 
   // just one destination.  most common case.
   if (state.pipesCount === 1) {
     // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes)
-      return this;
+    if (dest && dest !== state.pipes) return this;
 
-    if (!dest)
-      dest = state.pipes;
+    if (!dest) dest = state.pipes;
 
     // got a match.
     state.pipes = null;
     state.pipesCount = 0;
     state.flowing = false;
-    if (dest)
-      dest.emit('unpipe', this);
+    if (dest) dest.emit('unpipe', this, unpipeInfo);
     return this;
   }
 
@@ -12269,51 +11274,41 @@ Readable.prototype.unpipe = function(dest) {
     state.pipesCount = 0;
     state.flowing = false;
 
-    for (var i = 0; i < len; i++)
-      dests[i].emit('unpipe', this);
-    return this;
+    for (var i = 0; i < len; i++) {
+      dests[i].emit('unpipe', this, unpipeInfo);
+    }return this;
   }
 
   // try to find the right one.
-  var i = indexOf(state.pipes, dest);
-  if (i === -1)
-    return this;
+  var index = indexOf(state.pipes, dest);
+  if (index === -1) return this;
 
-  state.pipes.splice(i, 1);
+  state.pipes.splice(index, 1);
   state.pipesCount -= 1;
-  if (state.pipesCount === 1)
-    state.pipes = state.pipes[0];
+  if (state.pipesCount === 1) state.pipes = state.pipes[0];
 
-  dest.emit('unpipe', this);
+  dest.emit('unpipe', this, unpipeInfo);
 
   return this;
 };
 
 // set up data events if they are asked for
 // Ensure readable listeners eventually get something
-Readable.prototype.on = function(ev, fn) {
+Readable.prototype.on = function (ev, fn) {
   var res = Stream.prototype.on.call(this, ev, fn);
 
-  // If listening to data, and it has not explicitly been paused,
-  // then call resume to start the flow of data on the next tick.
-  if (ev === 'data' && false !== this._readableState.flowing) {
-    this.resume();
-  }
-
-  if (ev === 'readable' && this.readable) {
+  if (ev === 'data') {
+    // Start flowing on next tick if stream isn't explicitly paused
+    if (this._readableState.flowing !== false) this.resume();
+  } else if (ev === 'readable') {
     var state = this._readableState;
-    if (!state.readableListening) {
-      state.readableListening = true;
+    if (!state.endEmitted && !state.readableListening) {
+      state.readableListening = state.needReadable = true;
       state.emittedReadable = false;
-      state.needReadable = true;
       if (!state.reading) {
-        var self = this;
-        process.nextTick(function() {
-          debug('readable nexttick read 0');
-          self.read(0);
-        });
+        processNextTick(nReadingNextTick, this);
       } else if (state.length) {
-        emitReadable(this, state);
+        emitReadable(this);
       }
     }
   }
@@ -12322,17 +11317,18 @@ Readable.prototype.on = function(ev, fn) {
 };
 Readable.prototype.addListener = Readable.prototype.on;
 
+function nReadingNextTick(self) {
+  debug('readable nexttick read 0');
+  self.read(0);
+}
+
 // pause() and resume() are remnants of the legacy readable stream API
 // If the user uses them, then switch into old mode.
-Readable.prototype.resume = function() {
+Readable.prototype.resume = function () {
   var state = this._readableState;
   if (!state.flowing) {
     debug('resume');
     state.flowing = true;
-    if (!state.reading) {
-      debug('resume read 0');
-      this.read(0);
-    }
     resume(this, state);
   }
   return this;
@@ -12341,21 +11337,24 @@ Readable.prototype.resume = function() {
 function resume(stream, state) {
   if (!state.resumeScheduled) {
     state.resumeScheduled = true;
-    process.nextTick(function() {
-      resume_(stream, state);
-    });
+    processNextTick(resume_, stream, state);
   }
 }
 
 function resume_(stream, state) {
+  if (!state.reading) {
+    debug('resume read 0');
+    stream.read(0);
+  }
+
   state.resumeScheduled = false;
+  state.awaitDrain = 0;
   stream.emit('resume');
   flow(stream);
-  if (state.flowing && !state.reading)
-    stream.read(0);
+  if (state.flowing && !state.reading) stream.read(0);
 }
 
-Readable.prototype.pause = function() {
+Readable.prototype.pause = function () {
   debug('call pause flowing=%j', this._readableState.flowing);
   if (false !== this._readableState.flowing) {
     debug('pause');
@@ -12368,38 +11367,33 @@ Readable.prototype.pause = function() {
 function flow(stream) {
   var state = stream._readableState;
   debug('flow', state.flowing);
-  if (state.flowing) {
-    do {
-      var chunk = stream.read();
-    } while (null !== chunk && state.flowing);
-  }
+  while (state.flowing && stream.read() !== null) {}
 }
 
 // wrap an old-style stream as the async data source.
 // This is *not* part of the readable stream interface.
 // It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function(stream) {
+Readable.prototype.wrap = function (stream) {
   var state = this._readableState;
   var paused = false;
 
   var self = this;
-  stream.on('end', function() {
+  stream.on('end', function () {
     debug('wrapped end');
     if (state.decoder && !state.ended) {
       var chunk = state.decoder.end();
-      if (chunk && chunk.length)
-        self.push(chunk);
+      if (chunk && chunk.length) self.push(chunk);
     }
 
     self.push(null);
   });
 
-  stream.on('data', function(chunk) {
+  stream.on('data', function (chunk) {
     debug('wrapped data');
-    if (state.decoder)
-      chunk = state.decoder.write(chunk);
-    if (!chunk || !state.objectMode && !chunk.length)
-      return;
+    if (state.decoder) chunk = state.decoder.write(chunk);
+
+    // don't skip over falsy values in objectMode
+    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
 
     var ret = self.push(chunk);
     if (!ret) {
@@ -12411,22 +11405,23 @@ Readable.prototype.wrap = function(stream) {
   // proxy all the other methods.
   // important when wrapping filters and duplexes.
   for (var i in stream) {
-    if (util.isFunction(stream[i]) && util.isUndefined(this[i])) {
-      this[i] = function(method) { return function() {
-        return stream[method].apply(stream, arguments);
-      }}(i);
+    if (this[i] === undefined && typeof stream[i] === 'function') {
+      this[i] = function (method) {
+        return function () {
+          return stream[method].apply(stream, arguments);
+        };
+      }(i);
     }
   }
 
   // proxy certain important events.
-  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-  forEach(events, function(ev) {
-    stream.on(ev, self.emit.bind(self, ev));
-  });
+  for (var n = 0; n < kProxyEvents.length; n++) {
+    stream.on(kProxyEvents[n], self.emit.bind(self, kProxyEvents[n]));
+  }
 
   // when we try to consume some more bytes, simply unpause the
   // underlying stream.
-  self._read = function(n) {
+  self._read = function (n) {
     debug('wrapped _read', n);
     if (paused) {
       paused = false;
@@ -12437,74 +11432,106 @@ Readable.prototype.wrap = function(stream) {
   return self;
 };
 
-
-
 // exposed for testing purposes only.
 Readable._fromList = fromList;
 
 // Pluck off n bytes from an array of buffers.
 // Length is the combined lengths of all the buffers in the list.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
 function fromList(n, state) {
-  var list = state.buffer;
-  var length = state.length;
-  var stringMode = !!state.decoder;
-  var objectMode = !!state.objectMode;
+  // nothing buffered
+  if (state.length === 0) return null;
+
   var ret;
+  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
+    // read it all, truncate the list
+    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
+    state.buffer.clear();
+  } else {
+    // read part of list
+    ret = fromListPartial(n, state.buffer, state.decoder);
+  }
 
-  // nothing in the list, definitely empty.
-  if (list.length === 0)
-    return null;
+  return ret;
+}
 
-  if (length === 0)
-    ret = null;
-  else if (objectMode)
+// Extracts only enough buffered data to satisfy the amount requested.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function fromListPartial(n, list, hasStrings) {
+  var ret;
+  if (n < list.head.data.length) {
+    // slice is the same for buffers and strings
+    ret = list.head.data.slice(0, n);
+    list.head.data = list.head.data.slice(n);
+  } else if (n === list.head.data.length) {
+    // first chunk is a perfect match
     ret = list.shift();
-  else if (!n || n >= length) {
-    // read it all, truncate the array.
-    if (stringMode)
-      ret = list.join('');
-    else
-      ret = Buffer.concat(list, length);
-    list.length = 0;
   } else {
-    // read just some of it.
-    if (n < list[0].length) {
-      // just take a part of the first list item.
-      // slice is the same for buffers and strings.
-      var buf = list[0];
-      ret = buf.slice(0, n);
-      list[0] = buf.slice(n);
-    } else if (n === list[0].length) {
-      // first list is a perfect match
-      ret = list.shift();
-    } else {
-      // complex case.
-      // we have enough to cover it, but it spans past the first buffer.
-      if (stringMode)
-        ret = '';
-      else
-        ret = new Buffer(n);
-
-      var c = 0;
-      for (var i = 0, l = list.length; i < l && c < n; i++) {
-        var buf = list[0];
-        var cpy = Math.min(n - c, buf.length);
-
-        if (stringMode)
-          ret += buf.slice(0, cpy);
-        else
-          buf.copy(ret, c, 0, cpy);
-
-        if (cpy < buf.length)
-          list[0] = buf.slice(cpy);
-        else
-          list.shift();
+    // result spans more than one buffer
+    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
+  }
+  return ret;
+}
 
-        c += cpy;
+// Copies a specified amount of characters from the list of buffered data
+// chunks.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function copyFromBufferString(n, list) {
+  var p = list.head;
+  var c = 1;
+  var ret = p.data;
+  n -= ret.length;
+  while (p = p.next) {
+    var str = p.data;
+    var nb = n > str.length ? str.length : n;
+    if (nb === str.length) ret += str;else ret += str.slice(0, n);
+    n -= nb;
+    if (n === 0) {
+      if (nb === str.length) {
+        ++c;
+        if (p.next) list.head = p.next;else list.head = list.tail = null;
+      } else {
+        list.head = p;
+        p.data = str.slice(nb);
       }
+      break;
     }
+    ++c;
   }
+  list.length -= c;
+  return ret;
+}
 
+// Copies a specified amount of bytes from the list of buffered data chunks.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function copyFromBuffer(n, list) {
+  var ret = Buffer.allocUnsafe(n);
+  var p = list.head;
+  var c = 1;
+  p.data.copy(ret);
+  n -= p.data.length;
+  while (p = p.next) {
+    var buf = p.data;
+    var nb = n > buf.length ? buf.length : n;
+    buf.copy(ret, ret.length - n, 0, nb);
+    n -= nb;
+    if (n === 0) {
+      if (nb === buf.length) {
+        ++c;
+        if (p.next) list.head = p.next;else list.head = list.tail = null;
+      } else {
+        list.head = p;
+        p.data = buf.slice(nb);
+      }
+      break;
+    }
+    ++c;
+  }
+  list.length -= c;
   return ret;
 }
 
@@ -12513,37 +11540,37 @@ function endReadable(stream) {
 
   // If we get here before consuming all the bytes, then that is a
   // bug in node.  Should never happen.
-  if (state.length > 0)
-    throw new Error('endReadable called on non-empty stream');
+  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
 
   if (!state.endEmitted) {
     state.ended = true;
-    process.nextTick(function() {
-      // Check that we didn't get one last unshift.
-      if (!state.endEmitted && state.length === 0) {
-        state.endEmitted = true;
-        stream.readable = false;
-        stream.emit('end');
-      }
-    });
+    processNextTick(endReadableNT, state, stream);
+  }
+}
+
+function endReadableNT(state, stream) {
+  // Check that we didn't get one last unshift.
+  if (!state.endEmitted && state.length === 0) {
+    state.endEmitted = true;
+    stream.readable = false;
+    stream.emit('end');
   }
 }
 
-function forEach (xs, f) {
+function forEach(xs, f) {
   for (var i = 0, l = xs.length; i < l; i++) {
     f(xs[i], i);
   }
 }
 
-function indexOf (xs, x) {
+function indexOf(xs, x) {
   for (var i = 0, l = xs.length; i < l; i++) {
     if (xs[i] === x) return i;
   }
   return -1;
 }
-
-}).call(this,require('_process'))
-},{"./_stream_duplex":16,"_process":14,"buffer":7,"core-util-is":21,"events":11,"inherits":12,"isarray":13,"stream":26,"string_decoder/":27,"util":6}],19:[function(require,module,exports){
+}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./_stream_duplex":14,"./internal/streams/BufferList":19,"./internal/streams/destroy":20,"./internal/streams/stream":21,"_process":12,"core-util-is":5,"events":6,"inherits":8,"isarray":10,"process-nextick-args":11,"safe-buffer":26,"string_decoder/":28,"util":3}],17:[function(require,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -12565,7 +11592,6 @@ function indexOf (xs, x) {
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-
 // a transform stream is a readable/writable stream where you do
 // something with the data.  Sometimes it's called a "filter",
 // but that's not a great name for it, since that implies a thing where
@@ -12608,6 +11634,8 @@ function indexOf (xs, x) {
 // would be consumed, and then the rest would wait (un-transformed) until
 // the results of the previous transformed chunk were consumed.
 
+'use strict';
+
 module.exports = Transform;
 
 var Duplex = require('./_stream_duplex');
@@ -12619,9 +11647,8 @@ util.inherits = require('inherits');
 
 util.inherits(Transform, Duplex);
 
-
-function TransformState(options, stream) {
-  this.afterTransform = function(er, data) {
+function TransformState(stream) {
+  this.afterTransform = function (er, data) {
     return afterTransform(stream, er, data);
   };
 
@@ -12629,6 +11656,7 @@ function TransformState(options, stream) {
   this.transforming = false;
   this.writecb = null;
   this.writechunk = null;
+  this.writeencoding = null;
 }
 
 function afterTransform(stream, er, data) {
@@ -12637,17 +11665,16 @@ function afterTransform(stream, er, data) {
 
   var cb = ts.writecb;
 
-  if (!cb)
-    return stream.emit('error', new Error('no writecb in Transform class'));
+  if (!cb) {
+    return stream.emit('error', new Error('write callback called multiple times'));
+  }
 
   ts.writechunk = null;
   ts.writecb = null;
 
-  if (!util.isNullOrUndefined(data))
-    stream.push(data);
+  if (data !== null && data !== undefined) stream.push(data);
 
-  if (cb)
-    cb(er);
+  cb(er);
 
   var rs = stream._readableState;
   rs.reading = false;
@@ -12656,16 +11683,13 @@ function afterTransform(stream, er, data) {
   }
 }
 
-
 function Transform(options) {
-  if (!(this instanceof Transform))
-    return new Transform(options);
+  if (!(this instanceof Transform)) return new Transform(options);
 
   Duplex.call(this, options);
 
-  this._transformState = new TransformState(options, this);
+  this._transformState = new TransformState(this);
 
-  // when the writable side finishes, then flush out anything remaining.
   var stream = this;
 
   // start out asking for a readable event once data is transformed.
@@ -12676,17 +11700,21 @@ function Transform(options) {
   // sync guard flag.
   this._readableState.sync = false;
 
-  this.once('prefinish', function() {
-    if (util.isFunction(this._flush))
-      this._flush(function(er) {
-        done(stream, er);
-      });
-    else
-      done(stream);
+  if (options) {
+    if (typeof options.transform === 'function') this._transform = options.transform;
+
+    if (typeof options.flush === 'function') this._flush = options.flush;
+  }
+
+  // When the writable side finishes, then flush out anything remaining.
+  this.once('prefinish', function () {
+    if (typeof this._flush === 'function') this._flush(function (er, data) {
+      done(stream, er, data);
+    });else done(stream);
   });
 }
 
-Transform.prototype.push = function(chunk, encoding) {
+Transform.prototype.push = function (chunk, encoding) {
   this._transformState.needTransform = false;
   return Duplex.prototype.push.call(this, chunk, encoding);
 };
@@ -12701,31 +11729,28 @@ Transform.prototype.push = function(chunk, encoding) {
 // Call `cb(err)` when you are done with this chunk.  If you pass
 // an error, then that'll put the hurt on the whole operation.  If you
 // never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function(chunk, encoding, cb) {
-  throw new Error('not implemented');
+Transform.prototype._transform = function (chunk, encoding, cb) {
+  throw new Error('_transform() is not implemented');
 };
 
-Transform.prototype._write = function(chunk, encoding, cb) {
+Transform.prototype._write = function (chunk, encoding, cb) {
   var ts = this._transformState;
   ts.writecb = cb;
   ts.writechunk = chunk;
   ts.writeencoding = encoding;
   if (!ts.transforming) {
     var rs = this._readableState;
-    if (ts.needTransform ||
-        rs.needReadable ||
-        rs.length < rs.highWaterMark)
-      this._read(rs.highWaterMark);
+    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
   }
 };
 
 // Doesn't matter what the args are here.
 // _transform does all the work.
 // That we got here means that the readable side wants more data.
-Transform.prototype._read = function(n) {
+Transform.prototype._read = function (n) {
   var ts = this._transformState;
 
-  if (!util.isNull(ts.writechunk) && ts.writecb && !ts.transforming) {
+  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
     ts.transforming = true;
     this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
   } else {
@@ -12735,27 +11760,33 @@ Transform.prototype._read = function(n) {
   }
 };
 
+Transform.prototype._destroy = function (err, cb) {
+  var _this = this;
+
+  Duplex.prototype._destroy.call(this, err, function (err2) {
+    cb(err2);
+    _this.emit('close');
+  });
+};
+
+function done(stream, er, data) {
+  if (er) return stream.emit('error', er);
 
-function done(stream, er) {
-  if (er)
-    return stream.emit('error', er);
+  if (data !== null && data !== undefined) stream.push(data);
 
   // if there's nothing in the write buffer, then that means
   // that nothing more will ever be provided
   var ws = stream._writableState;
   var ts = stream._transformState;
 
-  if (ws.length)
-    throw new Error('calling transform done when ws.length != 0');
+  if (ws.length) throw new Error('Calling transform done when ws.length != 0');
 
-  if (ts.transforming)
-    throw new Error('calling transform done when still transforming');
+  if (ts.transforming) throw new Error('Calling transform done when still transforming');
 
   return stream.push(null);
 }
-
-},{"./_stream_duplex":16,"core-util-is":21,"inherits":12}],20:[function(require,module,exports){
-(function (process){
+},{"./_stream_duplex":14,"core-util-is":5,"inherits":8}],18:[function(require,module,exports){
+(function (process,global){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -12778,55 +11809,106 @@ function done(stream, er) {
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // A bit simpler than readable streams.
-// Implement an async ._write(chunk, cb), and it'll handle all
+// Implement an async ._write(chunk, encoding, cb), and it'll handle all
 // the drain event emission and buffering.
 
+'use strict';
+
+/*<replacement>*/
+
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
+
 module.exports = Writable;
 
+/* <replacement> */
+function WriteReq(chunk, encoding, cb) {
+  this.chunk = chunk;
+  this.encoding = encoding;
+  this.callback = cb;
+  this.next = null;
+}
+
+// It seems a linked list but it is not
+// there will be only 2 of these for each stream
+function CorkedRequest(state) {
+  var _this = this;
+
+  this.next = null;
+  this.entry = null;
+  this.finish = function () {
+    onCorkedFinish(_this, state);
+  };
+}
+/* </replacement> */
+
 /*<replacement>*/
-var Buffer = require('buffer').Buffer;
+var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
 /*</replacement>*/
 
-Writable.WritableState = WritableState;
+/*<replacement>*/
+var Duplex;
+/*</replacement>*/
 
+Writable.WritableState = WritableState;
 
 /*<replacement>*/
 var util = require('core-util-is');
 util.inherits = require('inherits');
 /*</replacement>*/
 
-var Stream = require('stream');
+/*<replacement>*/
+var internalUtil = {
+  deprecate: require('util-deprecate')
+};
+/*</replacement>*/
 
-util.inherits(Writable, Stream);
+/*<replacement>*/
+var Stream = require('./internal/streams/stream');
+/*</replacement>*/
 
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
+/*<replacement>*/
+var Buffer = require('safe-buffer').Buffer;
+var OurUint8Array = global.Uint8Array || function () {};
+function _uint8ArrayToBuffer(chunk) {
+  return Buffer.from(chunk);
+}
+function _isUint8Array(obj) {
+  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
 }
+/*</replacement>*/
+
+var destroyImpl = require('./internal/streams/destroy');
+
+util.inherits(Writable, Stream);
+
+function nop() {}
 
 function WritableState(options, stream) {
-  var Duplex = require('./_stream_duplex');
+  Duplex = Duplex || require('./_stream_duplex');
 
   options = options || {};
 
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var defaultHwm = options.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
-
   // object stream flag to indicate whether or not this stream
   // contains buffers or objects.
   this.objectMode = !!options.objectMode;
 
-  if (stream instanceof Duplex)
-    this.objectMode = this.objectMode || !!options.writableObjectMode;
+  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
+
+  // the point at which write() starts returning false
+  // Note: 0 is a valid value, means that we always return false if
+  // the entire buffer is not flushed immediately on write()
+  var hwm = options.highWaterMark;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.floor(this.highWaterMark);
 
+  // if _final has been called
+  this.finalCalled = false;
+
+  // drain event flag.
   this.needDrain = false;
   // at the start of calling end()
   this.ending = false;
@@ -12835,6 +11917,9 @@ function WritableState(options, stream) {
   // when 'finish' is emitted
   this.finished = false;
 
+  // has it been destroyed
+  this.destroyed = false;
+
   // should we decode strings into buffers before passing to _write?
   // this is here so that some node-core streams can optimize string
   // handling at a lower level.
@@ -12869,7 +11954,7 @@ function WritableState(options, stream) {
   this.bufferProcessing = false;
 
   // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function(er) {
+  this.onwrite = function (er) {
     onwrite(stream, er);
   };
 
@@ -12879,7 +11964,8 @@ function WritableState(options, stream) {
   // the amount that is being written when _write is called.
   this.writelen = 0;
 
-  this.buffer = [];
+  this.bufferedRequest = null;
+  this.lastBufferedRequest = null;
 
   // number of pending user-supplied write callbacks
   // this must be 0 before 'finish' can be emitted
@@ -12891,113 +11977,170 @@ function WritableState(options, stream) {
 
   // True if the error was already emitted and should not be thrown again
   this.errorEmitted = false;
+
+  // count buffered requests
+  this.bufferedRequestCount = 0;
+
+  // allocate the first CorkedRequest, there is always
+  // one allocated and free to use, and we maintain at most two
+  this.corkedRequestsFree = new CorkedRequest(this);
+}
+
+WritableState.prototype.getBuffer = function getBuffer() {
+  var current = this.bufferedRequest;
+  var out = [];
+  while (current) {
+    out.push(current);
+    current = current.next;
+  }
+  return out;
+};
+
+(function () {
+  try {
+    Object.defineProperty(WritableState.prototype, 'buffer', {
+      get: internalUtil.deprecate(function () {
+        return this.getBuffer();
+      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
+    });
+  } catch (_) {}
+})();
+
+// Test _writableState for inheritance to account for Duplex streams,
+// whose prototype chain only points to Readable.
+var realHasInstance;
+if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
+  realHasInstance = Function.prototype[Symbol.hasInstance];
+  Object.defineProperty(Writable, Symbol.hasInstance, {
+    value: function (object) {
+      if (realHasInstance.call(this, object)) return true;
+
+      return object && object._writableState instanceof WritableState;
+    }
+  });
+} else {
+  realHasInstance = function (object) {
+    return object instanceof this;
+  };
 }
 
 function Writable(options) {
-  var Duplex = require('./_stream_duplex');
+  Duplex = Duplex || require('./_stream_duplex');
+
+  // Writable ctor is applied to Duplexes, too.
+  // `realHasInstance` is necessary because using plain `instanceof`
+  // would return false, as no `_writableState` property is attached.
 
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex))
+  // Trying to use the custom `instanceof` for Writable here will also break the
+  // Node.js LazyTransform implementation, which has a non-trivial getter for
+  // `_writableState` that would lead to infinite recursion.
+  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
     return new Writable(options);
+  }
 
   this._writableState = new WritableState(options, this);
 
   // legacy.
   this.writable = true;
 
+  if (options) {
+    if (typeof options.write === 'function') this._write = options.write;
+
+    if (typeof options.writev === 'function') this._writev = options.writev;
+
+    if (typeof options.destroy === 'function') this._destroy = options.destroy;
+
+    if (typeof options.final === 'function') this._final = options.final;
+  }
+
   Stream.call(this);
 }
 
 // Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function() {
-  this.emit('error', new Error('Cannot pipe. Not readable.'));
+Writable.prototype.pipe = function () {
+  this.emit('error', new Error('Cannot pipe, not readable'));
 };
 
-
-function writeAfterEnd(stream, state, cb) {
+function writeAfterEnd(stream, cb) {
   var er = new Error('write after end');
   // TODO: defer error events consistently everywhere, not just the cb
   stream.emit('error', er);
-  process.nextTick(function() {
-    cb(er);
-  });
+  processNextTick(cb, er);
 }
 
-// If we get something that is not a buffer, string, null, or undefined,
-// and we're not in objectMode, then that's an error.
-// Otherwise stream chunks are all considered to be of length=1, and the
-// watermarks determine how many objects to keep in the buffer, rather than
-// how many bytes or characters.
+// Checks that a user-supplied chunk is valid, especially for the particular
+// mode the stream is in. Currently this means that `null` is never accepted
+// and undefined/non-string values are only allowed in object mode.
 function validChunk(stream, state, chunk, cb) {
   var valid = true;
-  if (!util.isBuffer(chunk) &&
-      !util.isString(chunk) &&
-      !util.isNullOrUndefined(chunk) &&
-      !state.objectMode) {
-    var er = new TypeError('Invalid non-string/buffer chunk');
+  var er = false;
+
+  if (chunk === null) {
+    er = new TypeError('May not write null values to stream');
+  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
+    er = new TypeError('Invalid non-string/buffer chunk');
+  }
+  if (er) {
     stream.emit('error', er);
-    process.nextTick(function() {
-      cb(er);
-    });
+    processNextTick(cb, er);
     valid = false;
   }
   return valid;
 }
 
-Writable.prototype.write = function(chunk, encoding, cb) {
+Writable.prototype.write = function (chunk, encoding, cb) {
   var state = this._writableState;
   var ret = false;
+  var isBuf = _isUint8Array(chunk) && !state.objectMode;
+
+  if (isBuf && !Buffer.isBuffer(chunk)) {
+    chunk = _uint8ArrayToBuffer(chunk);
+  }
 
-  if (util.isFunction(encoding)) {
+  if (typeof encoding === 'function') {
     cb = encoding;
     encoding = null;
   }
 
-  if (util.isBuffer(chunk))
-    encoding = 'buffer';
-  else if (!encoding)
-    encoding = state.defaultEncoding;
+  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
 
-  if (!util.isFunction(cb))
-    cb = function() {};
+  if (typeof cb !== 'function') cb = nop;
 
-  if (state.ended)
-    writeAfterEnd(this, state, cb);
-  else if (validChunk(this, state, chunk, cb)) {
+  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
     state.pendingcb++;
-    ret = writeOrBuffer(this, state, chunk, encoding, cb);
+    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
   }
 
   return ret;
 };
 
-Writable.prototype.cork = function() {
+Writable.prototype.cork = function () {
   var state = this._writableState;
 
   state.corked++;
 };
 
-Writable.prototype.uncork = function() {
+Writable.prototype.uncork = function () {
   var state = this._writableState;
 
   if (state.corked) {
     state.corked--;
 
-    if (!state.writing &&
-        !state.corked &&
-        !state.finished &&
-        !state.bufferProcessing &&
-        state.buffer.length)
-      clearBuffer(this, state);
+    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
   }
 };
 
+Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
+  // node::ParseEncoding() requires lower case.
+  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
+  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
+  this._writableState.defaultEncoding = encoding;
+  return this;
+};
+
 function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode &&
-      state.decodeStrings !== false &&
-      util.isString(chunk)) {
-    chunk = new Buffer(chunk, encoding);
+  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
+    chunk = Buffer.from(chunk, encoding);
   }
   return chunk;
 }
@@ -13005,23 +12148,41 @@ function decodeChunk(state, chunk, encoding) {
 // if we're already writing something, then just put this
 // in the queue, and wait our turn.  Otherwise, call _write
 // If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, chunk, encoding, cb) {
-  chunk = decodeChunk(state, chunk, encoding);
-  if (util.isBuffer(chunk))
-    encoding = 'buffer';
+function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
+  if (!isBuf) {
+    var newChunk = decodeChunk(state, chunk, encoding);
+    if (chunk !== newChunk) {
+      isBuf = true;
+      encoding = 'buffer';
+      chunk = newChunk;
+    }
+  }
   var len = state.objectMode ? 1 : chunk.length;
 
   state.length += len;
 
   var ret = state.length < state.highWaterMark;
   // we must ensure that previous needDrain will not be reset to false.
-  if (!ret)
-    state.needDrain = true;
+  if (!ret) state.needDrain = true;
 
-  if (state.writing || state.corked)
-    state.buffer.push(new WriteReq(chunk, encoding, cb));
-  else
+  if (state.writing || state.corked) {
+    var last = state.lastBufferedRequest;
+    state.lastBufferedRequest = {
+      chunk: chunk,
+      encoding: encoding,
+      isBuf: isBuf,
+      callback: cb,
+      next: null
+    };
+    if (last) {
+      last.next = state.lastBufferedRequest;
+    } else {
+      state.bufferedRequest = state.lastBufferedRequest;
+    }
+    state.bufferedRequestCount += 1;
+  } else {
     doWrite(stream, state, false, len, chunk, encoding, cb);
+  }
 
   return ret;
 }
@@ -13031,26 +12192,32 @@ function doWrite(stream, state, writev, len, chunk, encoding, cb) {
   state.writecb = cb;
   state.writing = true;
   state.sync = true;
-  if (writev)
-    stream._writev(chunk, state.onwrite);
-  else
-    stream._write(chunk, encoding, state.onwrite);
+  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
   state.sync = false;
 }
 
 function onwriteError(stream, state, sync, er, cb) {
-  if (sync)
-    process.nextTick(function() {
-      state.pendingcb--;
-      cb(er);
-    });
-  else {
-    state.pendingcb--;
+  --state.pendingcb;
+
+  if (sync) {
+    // defer the callback if we are being called synchronously
+    // to avoid piling up things on the stack
+    processNextTick(cb, er);
+    // this can emit finish, and it will always happen
+    // after error
+    processNextTick(finishMaybe, stream, state);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', er);
+  } else {
+    // the caller expect this to happen before if
+    // it is async
     cb(er);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', er);
+    // this can emit finish, but finish must
+    // always follow error
+    finishMaybe(stream, state);
   }
-
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
 }
 
 function onwriteStateUpdate(state) {
@@ -13067,23 +12234,18 @@ function onwrite(stream, er) {
 
   onwriteStateUpdate(state);
 
-  if (er)
-    onwriteError(stream, state, sync, er, cb);
-  else {
+  if (er) onwriteError(stream, state, sync, er, cb);else {
     // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(stream, state);
+    var finished = needFinish(state);
 
-    if (!finished &&
-        !state.corked &&
-        !state.bufferProcessing &&
-        state.buffer.length) {
+    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
       clearBuffer(stream, state);
     }
 
     if (sync) {
-      process.nextTick(function() {
-        afterWrite(stream, state, finished, cb);
-      });
+      /*<replacement>*/
+      asyncWrite(afterWrite, stream, state, finished, cb);
+      /*</replacement>*/
     } else {
       afterWrite(stream, state, finished, cb);
     }
@@ -13091,8 +12253,7 @@ function onwrite(stream, er) {
 }
 
 function afterWrite(stream, state, finished, cb) {
-  if (!finished)
-    onwriteDrain(stream, state);
+  if (!finished) onwriteDrain(stream, state);
   state.pendingcb--;
   cb();
   finishMaybe(stream, state);
@@ -13108,80 +12269,86 @@ function onwriteDrain(stream, state) {
   }
 }
 
-
 // if there's something in the buffer waiting, then process it
 function clearBuffer(stream, state) {
   state.bufferProcessing = true;
+  var entry = state.bufferedRequest;
 
-  if (stream._writev && state.buffer.length > 1) {
+  if (stream._writev && entry && entry.next) {
     // Fast case, write everything using _writev()
-    var cbs = [];
-    for (var c = 0; c < state.buffer.length; c++)
-      cbs.push(state.buffer[c].callback);
+    var l = state.bufferedRequestCount;
+    var buffer = new Array(l);
+    var holder = state.corkedRequestsFree;
+    holder.entry = entry;
 
-    // count the one we are adding, as well.
-    // TODO(isaacs) clean this up
-    state.pendingcb++;
-    doWrite(stream, state, true, state.length, state.buffer, '', function(err) {
-      for (var i = 0; i < cbs.length; i++) {
-        state.pendingcb--;
-        cbs[i](err);
-      }
-    });
+    var count = 0;
+    var allBuffers = true;
+    while (entry) {
+      buffer[count] = entry;
+      if (!entry.isBuf) allBuffers = false;
+      entry = entry.next;
+      count += 1;
+    }
+    buffer.allBuffers = allBuffers;
+
+    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
 
-    // Clear buffer
-    state.buffer = [];
+    // doWrite is almost always async, defer these to save a bit of time
+    // as the hot path ends with doWrite
+    state.pendingcb++;
+    state.lastBufferedRequest = null;
+    if (holder.next) {
+      state.corkedRequestsFree = holder.next;
+      holder.next = null;
+    } else {
+      state.corkedRequestsFree = new CorkedRequest(state);
+    }
   } else {
     // Slow case, write chunks one-by-one
-    for (var c = 0; c < state.buffer.length; c++) {
-      var entry = state.buffer[c];
+    while (entry) {
       var chunk = entry.chunk;
       var encoding = entry.encoding;
       var cb = entry.callback;
       var len = state.objectMode ? 1 : chunk.length;
 
       doWrite(stream, state, false, len, chunk, encoding, cb);
-
+      entry = entry.next;
       // if we didn't call the onwrite immediately, then
       // it means that we need to wait until it does.
       // also, that means that the chunk and cb are currently
       // being processed, so move the buffer counter past them.
       if (state.writing) {
-        c++;
         break;
       }
     }
 
-    if (c < state.buffer.length)
-      state.buffer = state.buffer.slice(c);
-    else
-      state.buffer.length = 0;
+    if (entry === null) state.lastBufferedRequest = null;
   }
 
+  state.bufferedRequestCount = 0;
+  state.bufferedRequest = entry;
   state.bufferProcessing = false;
 }
 
-Writable.prototype._write = function(chunk, encoding, cb) {
-  cb(new Error('not implemented'));
-
+Writable.prototype._write = function (chunk, encoding, cb) {
+  cb(new Error('_write() is not implemented'));
 };
 
 Writable.prototype._writev = null;
 
-Writable.prototype.end = function(chunk, encoding, cb) {
+Writable.prototype.end = function (chunk, encoding, cb) {
   var state = this._writableState;
 
-  if (util.isFunction(chunk)) {
+  if (typeof chunk === 'function') {
     cb = chunk;
     chunk = null;
     encoding = null;
-  } else if (util.isFunction(encoding)) {
+  } else if (typeof encoding === 'function') {
     cb = encoding;
     encoding = null;
   }
 
-  if (!util.isNullOrUndefined(chunk))
-    this.write(chunk, encoding);
+  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
 
   // .end() fully uncorks
   if (state.corked) {
@@ -13190,34 +12357,44 @@ Writable.prototype.end = function(chunk, encoding, cb) {
   }
 
   // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished)
-    endWritable(this, state, cb);
+  if (!state.ending && !state.finished) endWritable(this, state, cb);
 };
 
-
-function needFinish(stream, state) {
-  return (state.ending &&
-          state.length === 0 &&
-          !state.finished &&
-          !state.writing);
+function needFinish(state) {
+  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
 }
-
-function prefinish(stream, state) {
-  if (!state.prefinished) {
+function callFinal(stream, state) {
+  stream._final(function (err) {
+    state.pendingcb--;
+    if (err) {
+      stream.emit('error', err);
+    }
     state.prefinished = true;
     stream.emit('prefinish');
+    finishMaybe(stream, state);
+  });
+}
+function prefinish(stream, state) {
+  if (!state.prefinished && !state.finalCalled) {
+    if (typeof stream._final === 'function') {
+      state.pendingcb++;
+      state.finalCalled = true;
+      processNextTick(callFinal, stream, state);
+    } else {
+      state.prefinished = true;
+      stream.emit('prefinish');
+    }
   }
 }
 
 function finishMaybe(stream, state) {
-  var need = needFinish(stream, state);
+  var need = needFinish(state);
   if (need) {
+    prefinish(stream, state);
     if (state.pendingcb === 0) {
-      prefinish(stream, state);
       state.finished = true;
       stream.emit('finish');
-    } else
-      prefinish(stream, state);
+    }
   }
   return need;
 }
@@ -13226,144 +12403,289 @@ function endWritable(stream, state, cb) {
   state.ending = true;
   finishMaybe(stream, state);
   if (cb) {
-    if (state.finished)
-      process.nextTick(cb);
-    else
-      stream.once('finish', cb);
+    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
   }
   state.ended = true;
+  stream.writable = false;
 }
 
-}).call(this,require('_process'))
-},{"./_stream_duplex":16,"_process":14,"buffer":7,"core-util-is":21,"inherits":12,"stream":26}],21:[function(require,module,exports){
-(function (Buffer){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-function isArray(ar) {
-  return Array.isArray(ar);
+function onCorkedFinish(corkReq, state, err) {
+  var entry = corkReq.entry;
+  corkReq.entry = null;
+  while (entry) {
+    var cb = entry.callback;
+    state.pendingcb--;
+    cb(err);
+    entry = entry.next;
+  }
+  if (state.corkedRequestsFree) {
+    state.corkedRequestsFree.next = corkReq;
+  } else {
+    state.corkedRequestsFree = corkReq;
+  }
 }
-exports.isArray = isArray;
 
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
+Object.defineProperty(Writable.prototype, 'destroyed', {
+  get: function () {
+    if (this._writableState === undefined) {
+      return false;
+    }
+    return this._writableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (!this._writableState) {
+      return;
+    }
 
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._writableState.destroyed = value;
+  }
+});
 
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
+Writable.prototype.destroy = destroyImpl.destroy;
+Writable.prototype._undestroy = destroyImpl.undestroy;
+Writable.prototype._destroy = function (err, cb) {
+  this.end();
+  cb(err);
+};
+}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./_stream_duplex":14,"./internal/streams/destroy":20,"./internal/streams/stream":21,"_process":12,"core-util-is":5,"inherits":8,"process-nextick-args":11,"safe-buffer":26,"util-deprecate":29}],19:[function(require,module,exports){
+'use strict';
 
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-exports.isNumber = isNumber;
+/*<replacement>*/
 
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
+var Buffer = require('safe-buffer').Buffer;
+/*</replacement>*/
 
-function isUndefined(arg) {
-  return arg === void 0;
+function copyBuffer(src, target, offset) {
+  src.copy(target, offset);
 }
-exports.isUndefined = isUndefined;
 
-function isRegExp(re) {
-  return isObject(re) && objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
+module.exports = function () {
+  function BufferList() {
+    _classCallCheck(this, BufferList);
 
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
+    this.head = null;
+    this.tail = null;
+    this.length = 0;
+  }
 
-function isDate(d) {
-  return isObject(d) && objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
+  BufferList.prototype.push = function push(v) {
+    var entry = { data: v, next: null };
+    if (this.length > 0) this.tail.next = entry;else this.head = entry;
+    this.tail = entry;
+    ++this.length;
+  };
 
-function isError(e) {
-  return isObject(e) &&
-      (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
+  BufferList.prototype.unshift = function unshift(v) {
+    var entry = { data: v, next: this.head };
+    if (this.length === 0) this.tail = entry;
+    this.head = entry;
+    ++this.length;
+  };
 
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
+  BufferList.prototype.shift = function shift() {
+    if (this.length === 0) return;
+    var ret = this.head.data;
+    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
+    --this.length;
+    return ret;
+  };
 
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
+  BufferList.prototype.clear = function clear() {
+    this.head = this.tail = null;
+    this.length = 0;
+  };
+
+  BufferList.prototype.join = function join(s) {
+    if (this.length === 0) return '';
+    var p = this.head;
+    var ret = '' + p.data;
+    while (p = p.next) {
+      ret += s + p.data;
+    }return ret;
+  };
+
+  BufferList.prototype.concat = function concat(n) {
+    if (this.length === 0) return Buffer.alloc(0);
+    if (this.length === 1) return this.head.data;
+    var ret = Buffer.allocUnsafe(n >>> 0);
+    var p = this.head;
+    var i = 0;
+    while (p) {
+      copyBuffer(p.data, ret, i);
+      i += p.data.length;
+      p = p.next;
+    }
+    return ret;
+  };
+
+  return BufferList;
+}();
+},{"safe-buffer":26}],20:[function(require,module,exports){
+'use strict';
+
+/*<replacement>*/
+
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
+
+// undocumented cb() API, needed for core, not for public API
+function destroy(err, cb) {
+  var _this = this;
+
+  var readableDestroyed = this._readableState && this._readableState.destroyed;
+  var writableDestroyed = this._writableState && this._writableState.destroyed;
+
+  if (readableDestroyed || writableDestroyed) {
+    if (cb) {
+      cb(err);
+    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
+      processNextTick(emitErrorNT, this, err);
+    }
+    return;
+  }
+
+  // we set destroyed to true before firing error callbacks in order
+  // to make it re-entrance safe in case destroy() is called within callbacks
+
+  if (this._readableState) {
+    this._readableState.destroyed = true;
+  }
+
+  // if this is a duplex stream mark the writable part as destroyed as well
+  if (this._writableState) {
+    this._writableState.destroyed = true;
+  }
+
+  this._destroy(err || null, function (err) {
+    if (!cb && err) {
+      processNextTick(emitErrorNT, _this, err);
+      if (_this._writableState) {
+        _this._writableState.errorEmitted = true;
+      }
+    } else if (cb) {
+      cb(err);
+    }
+  });
 }
-exports.isPrimitive = isPrimitive;
 
-function isBuffer(arg) {
-  return Buffer.isBuffer(arg);
+function undestroy() {
+  if (this._readableState) {
+    this._readableState.destroyed = false;
+    this._readableState.reading = false;
+    this._readableState.ended = false;
+    this._readableState.endEmitted = false;
+  }
+
+  if (this._writableState) {
+    this._writableState.destroyed = false;
+    this._writableState.ended = false;
+    this._writableState.ending = false;
+    this._writableState.finished = false;
+    this._writableState.errorEmitted = false;
+  }
 }
-exports.isBuffer = isBuffer;
 
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
+function emitErrorNT(self, err) {
+  self.emit('error', err);
 }
-}).call(this,require("buffer").Buffer)
-},{"buffer":7}],22:[function(require,module,exports){
-module.exports = require("./lib/_stream_passthrough.js")
 
-},{"./lib/_stream_passthrough.js":17}],23:[function(require,module,exports){
+module.exports = {
+  destroy: destroy,
+  undestroy: undestroy
+};
+},{"process-nextick-args":11}],21:[function(require,module,exports){
+module.exports = require('events').EventEmitter;
+
+},{"events":6}],22:[function(require,module,exports){
+module.exports = require('./readable').PassThrough
+
+},{"./readable":23}],23:[function(require,module,exports){
 exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = require('stream');
+exports.Stream = exports;
 exports.Readable = exports;
 exports.Writable = require('./lib/_stream_writable.js');
 exports.Duplex = require('./lib/_stream_duplex.js');
 exports.Transform = require('./lib/_stream_transform.js');
 exports.PassThrough = require('./lib/_stream_passthrough.js');
 
-},{"./lib/_stream_duplex.js":16,"./lib/_stream_passthrough.js":17,"./lib/_stream_readable.js":18,"./lib/_stream_transform.js":19,"./lib/_stream_writable.js":20,"stream":26}],24:[function(require,module,exports){
-module.exports = require("./lib/_stream_transform.js")
+},{"./lib/_stream_duplex.js":14,"./lib/_stream_passthrough.js":15,"./lib/_stream_readable.js":16,"./lib/_stream_transform.js":17,"./lib/_stream_writable.js":18}],24:[function(require,module,exports){
+module.exports = require('./readable').Transform
 
-},{"./lib/_stream_transform.js":19}],25:[function(require,module,exports){
-module.exports = require("./lib/_stream_writable.js")
+},{"./readable":23}],25:[function(require,module,exports){
+module.exports = require('./lib/_stream_writable.js');
+
+},{"./lib/_stream_writable.js":18}],26:[function(require,module,exports){
+/* eslint-disable node/no-deprecated-api */
+var buffer = require('buffer')
+var Buffer = buffer.Buffer
+
+// alternative to using Object.keys for old browsers
+function copyProps (src, dst) {
+  for (var key in src) {
+    dst[key] = src[key]
+  }
+}
+if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
+  module.exports = buffer
+} else {
+  // Copy properties from require('buffer')
+  copyProps(buffer, exports)
+  exports.Buffer = SafeBuffer
+}
+
+function SafeBuffer (arg, encodingOrOffset, length) {
+  return Buffer(arg, encodingOrOffset, length)
+}
+
+// Copy static methods from Buffer
+copyProps(Buffer, SafeBuffer)
+
+SafeBuffer.from = function (arg, encodingOrOffset, length) {
+  if (typeof arg === 'number') {
+    throw new TypeError('Argument must not be a number')
+  }
+  return Buffer(arg, encodingOrOffset, length)
+}
+
+SafeBuffer.alloc = function (size, fill, encoding) {
+  if (typeof size !== 'number') {
+    throw new TypeError('Argument must be a number')
+  }
+  var buf = Buffer(size)
+  if (fill !== undefined) {
+    if (typeof encoding === 'string') {
+      buf.fill(fill, encoding)
+    } else {
+      buf.fill(fill)
+    }
+  } else {
+    buf.fill(0)
+  }
+  return buf
+}
+
+SafeBuffer.allocUnsafe = function (size) {
+  if (typeof size !== 'number') {
+    throw new TypeError('Argument must be a number')
+  }
+  return Buffer(size)
+}
+
+SafeBuffer.allocUnsafeSlow = function (size) {
+  if (typeof size !== 'number') {
+    throw new TypeError('Argument must be a number')
+  }
+  return buffer.SlowBuffer(size)
+}
 
-},{"./lib/_stream_writable.js":20}],26:[function(require,module,exports){
+},{"buffer":4}],27:[function(require,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -13492,237 +12814,360 @@ Stream.prototype.pipe = function(dest, options) {
   return dest;
 };
 
-},{"events":11,"inherits":12,"readable-stream/duplex.js":15,"readable-stream/passthrough.js":22,"readable-stream/readable.js":23,"readable-stream/transform.js":24,"readable-stream/writable.js":25}],27:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var Buffer = require('buffer').Buffer;
+},{"events":6,"inherits":8,"readable-stream/duplex.js":13,"readable-stream/passthrough.js":22,"readable-stream/readable.js":23,"readable-stream/transform.js":24,"readable-stream/writable.js":25}],28:[function(require,module,exports){
+'use strict';
 
-var isBufferEncoding = Buffer.isEncoding
-  || function(encoding) {
-       switch (encoding && encoding.toLowerCase()) {
-         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
-         default: return false;
-       }
-     }
+var Buffer = require('safe-buffer').Buffer;
 
+var isEncoding = Buffer.isEncoding || function (encoding) {
+  encoding = '' + encoding;
+  switch (encoding && encoding.toLowerCase()) {
+    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
+      return true;
+    default:
+      return false;
+  }
+};
 
-function assertEncoding(encoding) {
-  if (encoding && !isBufferEncoding(encoding)) {
-    throw new Error('Unknown encoding: ' + encoding);
+function _normalizeEncoding(enc) {
+  if (!enc) return 'utf8';
+  var retried;
+  while (true) {
+    switch (enc) {
+      case 'utf8':
+      case 'utf-8':
+        return 'utf8';
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return 'utf16le';
+      case 'latin1':
+      case 'binary':
+        return 'latin1';
+      case 'base64':
+      case 'ascii':
+      case 'hex':
+        return enc;
+      default:
+        if (retried) return; // undefined
+        enc = ('' + enc).toLowerCase();
+        retried = true;
+    }
   }
+};
+
+// Do not cache `Buffer.isEncoding` when checking encoding names as some
+// modules monkey-patch it to support additional encodings
+function normalizeEncoding(enc) {
+  var nenc = _normalizeEncoding(enc);
+  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
+  return nenc || enc;
 }
 
 // StringDecoder provides an interface for efficiently splitting a series of
 // buffers into a series of JS strings without breaking apart multi-byte
-// characters. CESU-8 is handled as part of the UTF-8 encoding.
-//
-// @TODO Handling all encodings inside a single object makes it very difficult
-// to reason about this code, so it should be split up in the future.
-// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
-// points as used by CESU-8.
-var StringDecoder = exports.StringDecoder = function(encoding) {
-  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
-  assertEncoding(encoding);
+// characters.
+exports.StringDecoder = StringDecoder;
+function StringDecoder(encoding) {
+  this.encoding = normalizeEncoding(encoding);
+  var nb;
   switch (this.encoding) {
-    case 'utf8':
-      // CESU-8 represents each of Surrogate Pair by 3-bytes
-      this.surrogateSize = 3;
-      break;
-    case 'ucs2':
     case 'utf16le':
-      // UTF-16 represents each of Surrogate Pair by 2-bytes
-      this.surrogateSize = 2;
-      this.detectIncompleteChar = utf16DetectIncompleteChar;
+      this.text = utf16Text;
+      this.end = utf16End;
+      nb = 4;
+      break;
+    case 'utf8':
+      this.fillLast = utf8FillLast;
+      nb = 4;
       break;
     case 'base64':
-      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
-      this.surrogateSize = 3;
-      this.detectIncompleteChar = base64DetectIncompleteChar;
+      this.text = base64Text;
+      this.end = base64End;
+      nb = 3;
       break;
     default:
-      this.write = passThroughWrite;
+      this.write = simpleWrite;
+      this.end = simpleEnd;
       return;
   }
+  this.lastNeed = 0;
+  this.lastTotal = 0;
+  this.lastChar = Buffer.allocUnsafe(nb);
+}
 
-  // Enough space to store all bytes of a single character. UTF-8 needs 4
-  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
-  this.charBuffer = new Buffer(6);
-  // Number of bytes received for the current incomplete multi-byte character.
-  this.charReceived = 0;
-  // Number of bytes expected for the current incomplete multi-byte character.
-  this.charLength = 0;
+StringDecoder.prototype.write = function (buf) {
+  if (buf.length === 0) return '';
+  var r;
+  var i;
+  if (this.lastNeed) {
+    r = this.fillLast(buf);
+    if (r === undefined) return '';
+    i = this.lastNeed;
+    this.lastNeed = 0;
+  } else {
+    i = 0;
+  }
+  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
+  return r || '';
 };
 
+StringDecoder.prototype.end = utf8End;
 
-// write decodes the given buffer and returns it as JS string that is
-// guaranteed to not contain any partial multi-byte characters. Any partial
-// character found at the end of the buffer is buffered up, and will be
-// returned when calling write again with the remaining bytes.
-//
-// Note: Converting a Buffer containing an orphan surrogate to a String
-// currently works, but converting a String to a Buffer (via `new Buffer`, or
-// Buffer#write) will replace incomplete surrogates with the unicode
-// replacement character. See https://codereview.chromium.org/121173009/ .
-StringDecoder.prototype.write = function(buffer) {
-  var charStr = '';
-  // if our last write ended with an incomplete multibyte character
-  while (this.charLength) {
-    // determine how many remaining bytes this buffer has to offer for this char
-    var available = (buffer.length >= this.charLength - this.charReceived) ?
-        this.charLength - this.charReceived :
-        buffer.length;
-
-    // add the new bytes to the char buffer
-    buffer.copy(this.charBuffer, this.charReceived, 0, available);
-    this.charReceived += available;
-
-    if (this.charReceived < this.charLength) {
-      // still not enough chars in this buffer? wait for more ...
-      return '';
-    }
+// Returns only complete characters in a Buffer
+StringDecoder.prototype.text = utf8Text;
 
-    // remove bytes belonging to the current character from the buffer
-    buffer = buffer.slice(available, buffer.length);
+// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
+StringDecoder.prototype.fillLast = function (buf) {
+  if (this.lastNeed <= buf.length) {
+    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
+    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
+  }
+  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
+  this.lastNeed -= buf.length;
+};
 
-    // get the character that was split
-    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);
+// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
+// continuation byte.
+function utf8CheckByte(byte) {
+  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
+  return -1;
+}
 
-    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-    var charCode = charStr.charCodeAt(charStr.length - 1);
-    if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-      this.charLength += this.surrogateSize;
-      charStr = '';
-      continue;
+// Checks at most 3 bytes at the end of a Buffer in order to detect an
+// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
+// needed to complete the UTF-8 character (if applicable) are returned.
+function utf8CheckIncomplete(self, buf, i) {
+  var j = buf.length - 1;
+  if (j < i) return 0;
+  var nb = utf8CheckByte(buf[j]);
+  if (nb >= 0) {
+    if (nb > 0) self.lastNeed = nb - 1;
+    return nb;
+  }
+  if (--j < i) return 0;
+  nb = utf8CheckByte(buf[j]);
+  if (nb >= 0) {
+    if (nb > 0) self.lastNeed = nb - 2;
+    return nb;
+  }
+  if (--j < i) return 0;
+  nb = utf8CheckByte(buf[j]);
+  if (nb >= 0) {
+    if (nb > 0) {
+      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
     }
-    this.charReceived = this.charLength = 0;
+    return nb;
+  }
+  return 0;
+}
 
-    // if there are no more bytes in this buffer, just emit our char
-    if (buffer.length === 0) {
-      return charStr;
+// Validates as many continuation bytes for a multi-byte UTF-8 character as
+// needed or are available. If we see a non-continuation byte where we expect
+// one, we "replace" the validated continuation bytes we've seen so far with
+// UTF-8 replacement characters ('\ufffd'), to match v8's UTF-8 decoding
+// behavior. The continuation byte check is included three times in the case
+// where all of the continuation bytes for a character exist in the same buffer.
+// It is also done this way as a slight performance increase instead of using a
+// loop.
+function utf8CheckExtraBytes(self, buf, p) {
+  if ((buf[0] & 0xC0) !== 0x80) {
+    self.lastNeed = 0;
+    return '\ufffd'.repeat(p);
+  }
+  if (self.lastNeed > 1 && buf.length > 1) {
+    if ((buf[1] & 0xC0) !== 0x80) {
+      self.lastNeed = 1;
+      return '\ufffd'.repeat(p + 1);
+    }
+    if (self.lastNeed > 2 && buf.length > 2) {
+      if ((buf[2] & 0xC0) !== 0x80) {
+        self.lastNeed = 2;
+        return '\ufffd'.repeat(p + 2);
+      }
     }
-    break;
   }
+}
 
-  // determine and set charLength / charReceived
-  this.detectIncompleteChar(buffer);
-
-  var end = buffer.length;
-  if (this.charLength) {
-    // buffer the incomplete character bytes we got
-    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
-    end -= this.charReceived;
+// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
+function utf8FillLast(buf) {
+  var p = this.lastTotal - this.lastNeed;
+  var r = utf8CheckExtraBytes(this, buf, p);
+  if (r !== undefined) return r;
+  if (this.lastNeed <= buf.length) {
+    buf.copy(this.lastChar, p, 0, this.lastNeed);
+    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
   }
+  buf.copy(this.lastChar, p, 0, buf.length);
+  this.lastNeed -= buf.length;
+}
 
-  charStr += buffer.toString(this.encoding, 0, end);
+// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
+// partial character, the character's bytes are buffered until the required
+// number of bytes are available.
+function utf8Text(buf, i) {
+  var total = utf8CheckIncomplete(this, buf, i);
+  if (!this.lastNeed) return buf.toString('utf8', i);
+  this.lastTotal = total;
+  var end = buf.length - (total - this.lastNeed);
+  buf.copy(this.lastChar, 0, end);
+  return buf.toString('utf8', i, end);
+}
 
-  var end = charStr.length - 1;
-  var charCode = charStr.charCodeAt(end);
-  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-  if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-    var size = this.surrogateSize;
-    this.charLength += size;
-    this.charReceived += size;
-    this.charBuffer.copy(this.charBuffer, size, 0, size);
-    buffer.copy(this.charBuffer, 0, 0, size);
-    return charStr.substring(0, end);
+// For UTF-8, a replacement character for each buffered byte of a (partial)
+// character needs to be added to the output.
+function utf8End(buf) {
+  var r = buf && buf.length ? this.write(buf) : '';
+  if (this.lastNeed) return r + '\ufffd'.repeat(this.lastTotal - this.lastNeed);
+  return r;
+}
+
+// UTF-16LE typically needs two bytes per character, but even if we have an even
+// number of bytes available, we need to check if we end on a leading/high
+// surrogate. In that case, we need to wait for the next two bytes in order to
+// decode the last character properly.
+function utf16Text(buf, i) {
+  if ((buf.length - i) % 2 === 0) {
+    var r = buf.toString('utf16le', i);
+    if (r) {
+      var c = r.charCodeAt(r.length - 1);
+      if (c >= 0xD800 && c <= 0xDBFF) {
+        this.lastNeed = 2;
+        this.lastTotal = 4;
+        this.lastChar[0] = buf[buf.length - 2];
+        this.lastChar[1] = buf[buf.length - 1];
+        return r.slice(0, -1);
+      }
+    }
+    return r;
   }
+  this.lastNeed = 1;
+  this.lastTotal = 2;
+  this.lastChar[0] = buf[buf.length - 1];
+  return buf.toString('utf16le', i, buf.length - 1);
+}
 
-  // or just emit the charStr
-  return charStr;
-};
+// For UTF-16LE we do not explicitly append special replacement characters if we
+// end on a partial character, we simply let v8 handle that.
+function utf16End(buf) {
+  var r = buf && buf.length ? this.write(buf) : '';
+  if (this.lastNeed) {
+    var end = this.lastTotal - this.lastNeed;
+    return r + this.lastChar.toString('utf16le', 0, end);
+  }
+  return r;
+}
 
-// detectIncompleteChar determines if there is an incomplete UTF-8 character at
-// the end of the given buffer. If so, it sets this.charLength to the byte
-// length that character, and sets this.charReceived to the number of bytes
-// that are available for this character.
-StringDecoder.prototype.detectIncompleteChar = function(buffer) {
-  // determine how many bytes we have to check at the end of this buffer
-  var i = (buffer.length >= 3) ? 3 : buffer.length;
+function base64Text(buf, i) {
+  var n = (buf.length - i) % 3;
+  if (n === 0) return buf.toString('base64', i);
+  this.lastNeed = 3 - n;
+  this.lastTotal = 3;
+  if (n === 1) {
+    this.lastChar[0] = buf[buf.length - 1];
+  } else {
+    this.lastChar[0] = buf[buf.length - 2];
+    this.lastChar[1] = buf[buf.length - 1];
+  }
+  return buf.toString('base64', i, buf.length - n);
+}
 
-  // Figure out if one of the last i bytes of our buffer announces an
-  // incomplete char.
-  for (; i > 0; i--) {
-    var c = buffer[buffer.length - i];
+function base64End(buf) {
+  var r = buf && buf.length ? this.write(buf) : '';
+  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
+  return r;
+}
 
-    // See http://en.wikipedia.org/wiki/UTF-8#Description
+// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
+function simpleWrite(buf) {
+  return buf.toString(this.encoding);
+}
 
-    // 110XXXXX
-    if (i == 1 && c >> 5 == 0x06) {
-      this.charLength = 2;
-      break;
-    }
+function simpleEnd(buf) {
+  return buf && buf.length ? this.write(buf) : '';
+}
+},{"safe-buffer":26}],29:[function(require,module,exports){
+(function (global){
 
-    // 1110XXXX
-    if (i <= 2 && c >> 4 == 0x0E) {
-      this.charLength = 3;
-      break;
-    }
+/**
+ * Module exports.
+ */
 
-    // 11110XXX
-    if (i <= 3 && c >> 3 == 0x1E) {
-      this.charLength = 4;
-      break;
-    }
-  }
-  this.charReceived = i;
-};
+module.exports = deprecate;
 
-StringDecoder.prototype.end = function(buffer) {
-  var res = '';
-  if (buffer && buffer.length)
-    res = this.write(buffer);
+/**
+ * Mark that a method should not be used.
+ * Returns a modified function which warns once by default.
+ *
+ * If `localStorage.noDeprecation = true` is set, then it is a no-op.
+ *
+ * If `localStorage.throwDeprecation = true` is set, then deprecated functions
+ * will throw an Error when invoked.
+ *
+ * If `localStorage.traceDeprecation = true` is set, then deprecated functions
+ * will invoke `console.trace()` instead of `console.error()`.
+ *
+ * @param {Function} fn - the function to deprecate
+ * @param {String} msg - the string to print to the console when `fn` is invoked
+ * @returns {Function} a new "deprecated" version of `fn`
+ * @api public
+ */
 
-  if (this.charReceived) {
-    var cr = this.charReceived;
-    var buf = this.charBuffer;
-    var enc = this.encoding;
-    res += buf.slice(0, cr).toString(enc);
+function deprecate (fn, msg) {
+  if (config('noDeprecation')) {
+    return fn;
   }
 
-  return res;
-};
+  var warned = false;
+  function deprecated() {
+    if (!warned) {
+      if (config('throwDeprecation')) {
+        throw new Error(msg);
+      } else if (config('traceDeprecation')) {
+        console.trace(msg);
+      } else {
+        console.warn(msg);
+      }
+      warned = true;
+    }
+    return fn.apply(this, arguments);
+  }
 
-function passThroughWrite(buffer) {
-  return buffer.toString(this.encoding);
+  return deprecated;
 }
 
-function utf16DetectIncompleteChar(buffer) {
-  this.charReceived = buffer.length % 2;
-  this.charLength = this.charReceived ? 2 : 0;
-}
+/**
+ * Checks `localStorage` for boolean values for the given `name`.
+ *
+ * @param {String} name
+ * @returns {Boolean}
+ * @api private
+ */
 
-function base64DetectIncompleteChar(buffer) {
-  this.charReceived = buffer.length % 3;
-  this.charLength = this.charReceived ? 3 : 0;
+function config (name) {
+  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
+  try {
+    if (!global.localStorage) return false;
+  } catch (_) {
+    return false;
+  }
+  var val = global.localStorage[name];
+  if (null == val) return false;
+  return String(val).toLowerCase() === 'true';
 }
 
-},{"buffer":7}],28:[function(require,module,exports){
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{}],30:[function(require,module,exports){
+arguments[4][8][0].apply(exports,arguments)
+},{"dup":8}],31:[function(require,module,exports){
 module.exports = function isBuffer(arg) {
   return arg && typeof arg === 'object'
     && typeof arg.copy === 'function'
     && typeof arg.fill === 'function'
     && typeof arg.readUInt8 === 'function';
 }
-},{}],29:[function(require,module,exports){
+},{}],32:[function(require,module,exports){
 (function (process,global){
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -13840,6033 +13285,8828 @@ exports.debuglog = function(set) {
 };
 
 
-/**
- * Echos the value of a value. Trys to print the value out
- * in the best way possible given the different types.
- *
- * @param {Object} obj The object to print out.
- * @param {Object} opts Optional options object that alters the output.
- */
-/* legacy: obj, showHidden, depth, colors*/
-function inspect(obj, opts) {
-  // default options
-  var ctx = {
-    seen: [],
-    stylize: stylizeNoColor
-  };
-  // legacy...
-  if (arguments.length >= 3) ctx.depth = arguments[2];
-  if (arguments.length >= 4) ctx.colors = arguments[3];
-  if (isBoolean(opts)) {
-    // legacy...
-    ctx.showHidden = opts;
-  } else if (opts) {
-    // got an "options" object
-    exports._extend(ctx, opts);
+/**
+ * Echos the value of a value. Trys to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Object} opts Optional options object that alters the output.
+ */
+/* legacy: obj, showHidden, depth, colors*/
+function inspect(obj, opts) {
+  // default options
+  var ctx = {
+    seen: [],
+    stylize: stylizeNoColor
+  };
+  // legacy...
+  if (arguments.length >= 3) ctx.depth = arguments[2];
+  if (arguments.length >= 4) ctx.colors = arguments[3];
+  if (isBoolean(opts)) {
+    // legacy...
+    ctx.showHidden = opts;
+  } else if (opts) {
+    // got an "options" object
+    exports._extend(ctx, opts);
+  }
+  // set default options
+  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
+  if (isUndefined(ctx.depth)) ctx.depth = 2;
+  if (isUndefined(ctx.colors)) ctx.colors = false;
+  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
+  if (ctx.colors) ctx.stylize = stylizeWithColor;
+  return formatValue(ctx, obj, ctx.depth);
+}
+exports.inspect = inspect;
+
+
+// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
+inspect.colors = {
+  'bold' : [1, 22],
+  'italic' : [3, 23],
+  'underline' : [4, 24],
+  'inverse' : [7, 27],
+  'white' : [37, 39],
+  'grey' : [90, 39],
+  'black' : [30, 39],
+  'blue' : [34, 39],
+  'cyan' : [36, 39],
+  'green' : [32, 39],
+  'magenta' : [35, 39],
+  'red' : [31, 39],
+  'yellow' : [33, 39]
+};
+
+// Don't use 'blue' not visible on cmd.exe
+inspect.styles = {
+  'special': 'cyan',
+  'number': 'yellow',
+  'boolean': 'yellow',
+  'undefined': 'grey',
+  'null': 'bold',
+  'string': 'green',
+  'date': 'magenta',
+  // "name": intentionally not styling
+  'regexp': 'red'
+};
+
+
+function stylizeWithColor(str, styleType) {
+  var style = inspect.styles[styleType];
+
+  if (style) {
+    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
+           '\u001b[' + inspect.colors[style][1] + 'm';
+  } else {
+    return str;
+  }
+}
+
+
+function stylizeNoColor(str, styleType) {
+  return str;
+}
+
+
+function arrayToHash(array) {
+  var hash = {};
+
+  array.forEach(function(val, idx) {
+    hash[val] = true;
+  });
+
+  return hash;
+}
+
+
+function formatValue(ctx, value, recurseTimes) {
+  // Provide a hook for user-specified inspect functions.
+  // Check that value is an object with an inspect function on it
+  if (ctx.customInspect &&
+      value &&
+      isFunction(value.inspect) &&
+      // Filter out the util module, it's inspect function is special
+      value.inspect !== exports.inspect &&
+      // Also filter out any prototype objects using the circular check.
+      !(value.constructor && value.constructor.prototype === value)) {
+    var ret = value.inspect(recurseTimes, ctx);
+    if (!isString(ret)) {
+      ret = formatValue(ctx, ret, recurseTimes);
+    }
+    return ret;
+  }
+
+  // Primitive types cannot have properties
+  var primitive = formatPrimitive(ctx, value);
+  if (primitive) {
+    return primitive;
+  }
+
+  // Look up the keys of the object.
+  var keys = Object.keys(value);
+  var visibleKeys = arrayToHash(keys);
+
+  if (ctx.showHidden) {
+    keys = Object.getOwnPropertyNames(value);
+  }
+
+  // IE doesn't make error fields non-enumerable
+  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
+  if (isError(value)
+      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
+    return formatError(value);
+  }
+
+  // Some type of object without properties can be shortcutted.
+  if (keys.length === 0) {
+    if (isFunction(value)) {
+      var name = value.name ? ': ' + value.name : '';
+      return ctx.stylize('[Function' + name + ']', 'special');
+    }
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    }
+    if (isDate(value)) {
+      return ctx.stylize(Date.prototype.toString.call(value), 'date');
+    }
+    if (isError(value)) {
+      return formatError(value);
+    }
+  }
+
+  var base = '', array = false, braces = ['{', '}'];
+
+  // Make Array say that they are Array
+  if (isArray(value)) {
+    array = true;
+    braces = ['[', ']'];
+  }
+
+  // Make functions say that they are functions
+  if (isFunction(value)) {
+    var n = value.name ? ': ' + value.name : '';
+    base = ' [Function' + n + ']';
+  }
+
+  // Make RegExps say that they are RegExps
+  if (isRegExp(value)) {
+    base = ' ' + RegExp.prototype.toString.call(value);
+  }
+
+  // Make dates with properties first say the date
+  if (isDate(value)) {
+    base = ' ' + Date.prototype.toUTCString.call(value);
+  }
+
+  // Make error with message first say the error
+  if (isError(value)) {
+    base = ' ' + formatError(value);
+  }
+
+  if (keys.length === 0 && (!array || value.length == 0)) {
+    return braces[0] + base + braces[1];
+  }
+
+  if (recurseTimes < 0) {
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    } else {
+      return ctx.stylize('[Object]', 'special');
+    }
+  }
+
+  ctx.seen.push(value);
+
+  var output;
+  if (array) {
+    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+  } else {
+    output = keys.map(function(key) {
+      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+    });
+  }
+
+  ctx.seen.pop();
+
+  return reduceToSingleString(output, base, braces);
+}
+
+
+function formatPrimitive(ctx, value) {
+  if (isUndefined(value))
+    return ctx.stylize('undefined', 'undefined');
+  if (isString(value)) {
+    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+                                             .replace(/'/g, "\\'")
+                                             .replace(/\\"/g, '"') + '\'';
+    return ctx.stylize(simple, 'string');
+  }
+  if (isNumber(value))
+    return ctx.stylize('' + value, 'number');
+  if (isBoolean(value))
+    return ctx.stylize('' + value, 'boolean');
+  // For some reason typeof null is "object", so special case here.
+  if (isNull(value))
+    return ctx.stylize('null', 'null');
+}
+
+
+function formatError(value) {
+  return '[' + Error.prototype.toString.call(value) + ']';
+}
+
+
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+  var output = [];
+  for (var i = 0, l = value.length; i < l; ++i) {
+    if (hasOwnProperty(value, String(i))) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          String(i), true));
+    } else {
+      output.push('');
+    }
+  }
+  keys.forEach(function(key) {
+    if (!key.match(/^\d+$/)) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          key, true));
+    }
+  });
+  return output;
+}
+
+
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+  var name, str, desc;
+  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
+  if (desc.get) {
+    if (desc.set) {
+      str = ctx.stylize('[Getter/Setter]', 'special');
+    } else {
+      str = ctx.stylize('[Getter]', 'special');
+    }
+  } else {
+    if (desc.set) {
+      str = ctx.stylize('[Setter]', 'special');
+    }
+  }
+  if (!hasOwnProperty(visibleKeys, key)) {
+    name = '[' + key + ']';
+  }
+  if (!str) {
+    if (ctx.seen.indexOf(desc.value) < 0) {
+      if (isNull(recurseTimes)) {
+        str = formatValue(ctx, desc.value, null);
+      } else {
+        str = formatValue(ctx, desc.value, recurseTimes - 1);
+      }
+      if (str.indexOf('\n') > -1) {
+        if (array) {
+          str = str.split('\n').map(function(line) {
+            return '  ' + line;
+          }).join('\n').substr(2);
+        } else {
+          str = '\n' + str.split('\n').map(function(line) {
+            return '   ' + line;
+          }).join('\n');
+        }
+      }
+    } else {
+      str = ctx.stylize('[Circular]', 'special');
+    }
+  }
+  if (isUndefined(name)) {
+    if (array && key.match(/^\d+$/)) {
+      return str;
+    }
+    name = JSON.stringify('' + key);
+    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+      name = name.substr(1, name.length - 2);
+      name = ctx.stylize(name, 'name');
+    } else {
+      name = name.replace(/'/g, "\\'")
+                 .replace(/\\"/g, '"')
+                 .replace(/(^"|"$)/g, "'");
+      name = ctx.stylize(name, 'string');
+    }
+  }
+
+  return name + ': ' + str;
+}
+
+
+function reduceToSingleString(output, base, braces) {
+  var numLinesEst = 0;
+  var length = output.reduce(function(prev, cur) {
+    numLinesEst++;
+    if (cur.indexOf('\n') >= 0) numLinesEst++;
+    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
+  }, 0);
+
+  if (length > 60) {
+    return braces[0] +
+           (base === '' ? '' : base + '\n ') +
+           ' ' +
+           output.join(',\n  ') +
+           ' ' +
+           braces[1];
+  }
+
+  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
+
+
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
+function isArray(ar) {
+  return Array.isArray(ar);
+}
+exports.isArray = isArray;
+
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
+
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
+
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
+
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
+
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
+
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
+
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
+
+function isRegExp(re) {
+  return isObject(re) && objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
+
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
+
+function isDate(d) {
+  return isObject(d) && objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
+
+function isError(e) {
+  return isObject(e) &&
+      (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
+
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
+
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
+
+exports.isBuffer = require('./support/isBuffer');
+
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
+}
+
+
+function pad(n) {
+  return n < 10 ? '0' + n.toString(10) : n.toString(10);
+}
+
+
+var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
+              'Oct', 'Nov', 'Dec'];
+
+// 26 Feb 16:19:34
+function timestamp() {
+  var d = new Date();
+  var time = [pad(d.getHours()),
+              pad(d.getMinutes()),
+              pad(d.getSeconds())].join(':');
+  return [d.getDate(), months[d.getMonth()], time].join(' ');
+}
+
+
+// log is just a thin wrapper to console.log that prepends a timestamp
+exports.log = function() {
+  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
+};
+
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * The Function.prototype.inherits from lang.js rewritten as a standalone
+ * function (not on Function.prototype). NOTE: If this file is to be loaded
+ * during bootstrapping this function needs to be rewritten using some native
+ * functions as prototype setup using normal JavaScript does not work as
+ * expected during bootstrapping (see mirror.js in r114903).
+ *
+ * @param {function} ctor Constructor function which needs to inherit the
+ *     prototype.
+ * @param {function} superCtor Constructor function to inherit prototype from.
+ */
+exports.inherits = require('inherits');
+
+exports._extend = function(origin, add) {
+  // Don't do anything if add isn't an object
+  if (!add || !isObject(add)) return origin;
+
+  var keys = Object.keys(add);
+  var i = keys.length;
+  while (i--) {
+    origin[keys[i]] = add[keys[i]];
+  }
+  return origin;
+};
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
+}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./support/isBuffer":31,"_process":12,"inherits":30}],33:[function(require,module,exports){
+module.exports = {
+      base58: require('bs58'),
+      bitcoin: require('bitcoinjs-lib'),
+      ecurve: require('ecurve'),
+      BigInteger: require('bigi')
+}
+
+},{"bigi":37,"bitcoinjs-lib":50,"bs58":79,"ecurve":89}],34:[function(require,module,exports){
+// base-x encoding
+// Forked from https://github.com/cryptocoinjs/bs58
+// Originally written by Mike Hearn for BitcoinJ
+// Copyright (c) 2011 Google Inc
+// Ported to JavaScript by Stefan Thomas
+// Merged Buffer refactorings from base58-native by Stephen Pair
+// Copyright (c) 2013 BitPay Inc
+
+var Buffer = require('safe-buffer').Buffer
+
+module.exports = function base (ALPHABET) {
+  var ALPHABET_MAP = {}
+  var BASE = ALPHABET.length
+  var LEADER = ALPHABET.charAt(0)
+
+  // pre-compute lookup table
+  for (var z = 0; z < ALPHABET.length; z++) {
+    var x = ALPHABET.charAt(z)
+
+    if (ALPHABET_MAP[x] !== undefined) throw new TypeError(x + ' is ambiguous')
+    ALPHABET_MAP[x] = z
+  }
+
+  function encode (source) {
+    if (source.length === 0) return ''
+
+    var digits = [0]
+    for (var i = 0; i < source.length; ++i) {
+      for (var j = 0, carry = source[i]; j < digits.length; ++j) {
+        carry += digits[j] << 8
+        digits[j] = carry % BASE
+        carry = (carry / BASE) | 0
+      }
+
+      while (carry > 0) {
+        digits.push(carry % BASE)
+        carry = (carry / BASE) | 0
+      }
+    }
+
+    var string = ''
+
+    // deal with leading zeros
+    for (var k = 0; source[k] === 0 && k < source.length - 1; ++k) string += ALPHABET[0]
+    // convert digits to a string
+    for (var q = digits.length - 1; q >= 0; --q) string += ALPHABET[digits[q]]
+
+    return string
+  }
+
+  function decodeUnsafe (string) {
+    if (string.length === 0) return Buffer.allocUnsafe(0)
+
+    var bytes = [0]
+    for (var i = 0; i < string.length; i++) {
+      var value = ALPHABET_MAP[string[i]]
+      if (value === undefined) return
+
+      for (var j = 0, carry = value; j < bytes.length; ++j) {
+        carry += bytes[j] * BASE
+        bytes[j] = carry & 0xff
+        carry >>= 8
+      }
+
+      while (carry > 0) {
+        bytes.push(carry & 0xff)
+        carry >>= 8
+      }
+    }
+
+    // deal with leading zeros
+    for (var k = 0; string[k] === LEADER && k < string.length - 1; ++k) {
+      bytes.push(0)
+    }
+
+    return Buffer.from(bytes.reverse())
+  }
+
+  function decode (string) {
+    var buffer = decodeUnsafe(string)
+    if (buffer) return buffer
+
+    throw new Error('Non-base' + BASE + ' character')
+  }
+
+  return {
+    encode: encode,
+    decodeUnsafe: decodeUnsafe,
+    decode: decode
+  }
+}
+
+},{"safe-buffer":98}],35:[function(require,module,exports){
+// (public) Constructor
+function BigInteger(a, b, c) {
+  if (!(this instanceof BigInteger))
+    return new BigInteger(a, b, c)
+
+  if (a != null) {
+    if ("number" == typeof a) this.fromNumber(a, b, c)
+    else if (b == null && "string" != typeof a) this.fromString(a, 256)
+    else this.fromString(a, b)
+  }
+}
+
+var proto = BigInteger.prototype
+
+// duck-typed isBigInteger
+proto.__bigi = require('../package.json').version
+BigInteger.isBigInteger = function (obj, check_ver) {
+  return obj && obj.__bigi && (!check_ver || obj.__bigi === proto.__bigi)
+}
+
+// Bits per digit
+var dbits
+
+// am: Compute w_j += (x*this_i), propagate carries,
+// c is initial carry, returns final carry.
+// c < 3*dvalue, x < 2*dvalue, this_i < dvalue
+// We need to select the fastest one that works in this environment.
+
+// am1: use a single mult and divide to get the high bits,
+// max digit bits should be 26 because
+// max internal value = 2*dvalue^2-2*dvalue (< 2^53)
+function am1(i, x, w, j, c, n) {
+  while (--n >= 0) {
+    var v = x * this[i++] + w[j] + c
+    c = Math.floor(v / 0x4000000)
+    w[j++] = v & 0x3ffffff
+  }
+  return c
+}
+// am2 avoids a big mult-and-extract completely.
+// Max digit bits should be <= 30 because we do bitwise ops
+// on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)
+function am2(i, x, w, j, c, n) {
+  var xl = x & 0x7fff,
+    xh = x >> 15
+  while (--n >= 0) {
+    var l = this[i] & 0x7fff
+    var h = this[i++] >> 15
+    var m = xh * l + h * xl
+    l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff)
+    c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30)
+    w[j++] = l & 0x3fffffff
+  }
+  return c
+}
+// Alternately, set max digit bits to 28 since some
+// browsers slow down when dealing with 32-bit numbers.
+function am3(i, x, w, j, c, n) {
+  var xl = x & 0x3fff,
+    xh = x >> 14
+  while (--n >= 0) {
+    var l = this[i] & 0x3fff
+    var h = this[i++] >> 14
+    var m = xh * l + h * xl
+    l = xl * l + ((m & 0x3fff) << 14) + w[j] + c
+    c = (l >> 28) + (m >> 14) + xh * h
+    w[j++] = l & 0xfffffff
+  }
+  return c
+}
+
+// wtf?
+BigInteger.prototype.am = am1
+dbits = 26
+
+BigInteger.prototype.DB = dbits
+BigInteger.prototype.DM = ((1 << dbits) - 1)
+var DV = BigInteger.prototype.DV = (1 << dbits)
+
+var BI_FP = 52
+BigInteger.prototype.FV = Math.pow(2, BI_FP)
+BigInteger.prototype.F1 = BI_FP - dbits
+BigInteger.prototype.F2 = 2 * dbits - BI_FP
+
+// Digit conversions
+var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz"
+var BI_RC = new Array()
+var rr, vv
+rr = "0".charCodeAt(0)
+for (vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv
+rr = "a".charCodeAt(0)
+for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv
+rr = "A".charCodeAt(0)
+for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv
+
+function int2char(n) {
+  return BI_RM.charAt(n)
+}
+
+function intAt(s, i) {
+  var c = BI_RC[s.charCodeAt(i)]
+  return (c == null) ? -1 : c
+}
+
+// (protected) copy this to r
+function bnpCopyTo(r) {
+  for (var i = this.t - 1; i >= 0; --i) r[i] = this[i]
+  r.t = this.t
+  r.s = this.s
+}
+
+// (protected) set from integer value x, -DV <= x < DV
+function bnpFromInt(x) {
+  this.t = 1
+  this.s = (x < 0) ? -1 : 0
+  if (x > 0) this[0] = x
+  else if (x < -1) this[0] = x + DV
+  else this.t = 0
+}
+
+// return bigint initialized to value
+function nbv(i) {
+  var r = new BigInteger()
+  r.fromInt(i)
+  return r
+}
+
+// (protected) set from string and radix
+function bnpFromString(s, b) {
+  var self = this
+
+  var k
+  if (b == 16) k = 4
+  else if (b == 8) k = 3
+  else if (b == 256) k = 8; // byte array
+  else if (b == 2) k = 1
+  else if (b == 32) k = 5
+  else if (b == 4) k = 2
+  else {
+    self.fromRadix(s, b)
+    return
+  }
+  self.t = 0
+  self.s = 0
+  var i = s.length,
+    mi = false,
+    sh = 0
+  while (--i >= 0) {
+    var x = (k == 8) ? s[i] & 0xff : intAt(s, i)
+    if (x < 0) {
+      if (s.charAt(i) == "-") mi = true
+      continue
+    }
+    mi = false
+    if (sh == 0)
+      self[self.t++] = x
+    else if (sh + k > self.DB) {
+      self[self.t - 1] |= (x & ((1 << (self.DB - sh)) - 1)) << sh
+      self[self.t++] = (x >> (self.DB - sh))
+    } else
+      self[self.t - 1] |= x << sh
+    sh += k
+    if (sh >= self.DB) sh -= self.DB
+  }
+  if (k == 8 && (s[0] & 0x80) != 0) {
+    self.s = -1
+    if (sh > 0) self[self.t - 1] |= ((1 << (self.DB - sh)) - 1) << sh
+  }
+  self.clamp()
+  if (mi) BigInteger.ZERO.subTo(self, self)
+}
+
+// (protected) clamp off excess high words
+function bnpClamp() {
+  var c = this.s & this.DM
+  while (this.t > 0 && this[this.t - 1] == c)--this.t
+}
+
+// (public) return string representation in given radix
+function bnToString(b) {
+  var self = this
+  if (self.s < 0) return "-" + self.negate()
+    .toString(b)
+  var k
+  if (b == 16) k = 4
+  else if (b == 8) k = 3
+  else if (b == 2) k = 1
+  else if (b == 32) k = 5
+  else if (b == 4) k = 2
+  else return self.toRadix(b)
+  var km = (1 << k) - 1,
+    d, m = false,
+    r = "",
+    i = self.t
+  var p = self.DB - (i * self.DB) % k
+  if (i-- > 0) {
+    if (p < self.DB && (d = self[i] >> p) > 0) {
+      m = true
+      r = int2char(d)
+    }
+    while (i >= 0) {
+      if (p < k) {
+        d = (self[i] & ((1 << p) - 1)) << (k - p)
+        d |= self[--i] >> (p += self.DB - k)
+      } else {
+        d = (self[i] >> (p -= k)) & km
+        if (p <= 0) {
+          p += self.DB
+          --i
+        }
+      }
+      if (d > 0) m = true
+      if (m) r += int2char(d)
+    }
+  }
+  return m ? r : "0"
+}
+
+// (public) -this
+function bnNegate() {
+  var r = new BigInteger()
+  BigInteger.ZERO.subTo(this, r)
+  return r
+}
+
+// (public) |this|
+function bnAbs() {
+  return (this.s < 0) ? this.negate() : this
+}
+
+// (public) return + if this > a, - if this < a, 0 if equal
+function bnCompareTo(a) {
+  var r = this.s - a.s
+  if (r != 0) return r
+  var i = this.t
+  r = i - a.t
+  if (r != 0) return (this.s < 0) ? -r : r
+  while (--i >= 0)
+    if ((r = this[i] - a[i]) != 0) return r
+  return 0
+}
+
+// returns bit length of the integer x
+function nbits(x) {
+  var r = 1,
+    t
+  if ((t = x >>> 16) != 0) {
+    x = t
+    r += 16
+  }
+  if ((t = x >> 8) != 0) {
+    x = t
+    r += 8
+  }
+  if ((t = x >> 4) != 0) {
+    x = t
+    r += 4
+  }
+  if ((t = x >> 2) != 0) {
+    x = t
+    r += 2
+  }
+  if ((t = x >> 1) != 0) {
+    x = t
+    r += 1
+  }
+  return r
+}
+
+// (public) return the number of bits in "this"
+function bnBitLength() {
+  if (this.t <= 0) return 0
+  return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ (this.s & this.DM))
+}
+
+// (public) return the number of bytes in "this"
+function bnByteLength() {
+  return this.bitLength() >> 3
+}
+
+// (protected) r = this << n*DB
+function bnpDLShiftTo(n, r) {
+  var i
+  for (i = this.t - 1; i >= 0; --i) r[i + n] = this[i]
+  for (i = n - 1; i >= 0; --i) r[i] = 0
+  r.t = this.t + n
+  r.s = this.s
+}
+
+// (protected) r = this >> n*DB
+function bnpDRShiftTo(n, r) {
+  for (var i = n; i < this.t; ++i) r[i - n] = this[i]
+  r.t = Math.max(this.t - n, 0)
+  r.s = this.s
+}
+
+// (protected) r = this << n
+function bnpLShiftTo(n, r) {
+  var self = this
+  var bs = n % self.DB
+  var cbs = self.DB - bs
+  var bm = (1 << cbs) - 1
+  var ds = Math.floor(n / self.DB),
+    c = (self.s << bs) & self.DM,
+    i
+  for (i = self.t - 1; i >= 0; --i) {
+    r[i + ds + 1] = (self[i] >> cbs) | c
+    c = (self[i] & bm) << bs
+  }
+  for (i = ds - 1; i >= 0; --i) r[i] = 0
+  r[ds] = c
+  r.t = self.t + ds + 1
+  r.s = self.s
+  r.clamp()
+}
+
+// (protected) r = this >> n
+function bnpRShiftTo(n, r) {
+  var self = this
+  r.s = self.s
+  var ds = Math.floor(n / self.DB)
+  if (ds >= self.t) {
+    r.t = 0
+    return
+  }
+  var bs = n % self.DB
+  var cbs = self.DB - bs
+  var bm = (1 << bs) - 1
+  r[0] = self[ds] >> bs
+  for (var i = ds + 1; i < self.t; ++i) {
+    r[i - ds - 1] |= (self[i] & bm) << cbs
+    r[i - ds] = self[i] >> bs
+  }
+  if (bs > 0) r[self.t - ds - 1] |= (self.s & bm) << cbs
+  r.t = self.t - ds
+  r.clamp()
+}
+
+// (protected) r = this - a
+function bnpSubTo(a, r) {
+  var self = this
+  var i = 0,
+    c = 0,
+    m = Math.min(a.t, self.t)
+  while (i < m) {
+    c += self[i] - a[i]
+    r[i++] = c & self.DM
+    c >>= self.DB
+  }
+  if (a.t < self.t) {
+    c -= a.s
+    while (i < self.t) {
+      c += self[i]
+      r[i++] = c & self.DM
+      c >>= self.DB
+    }
+    c += self.s
+  } else {
+    c += self.s
+    while (i < a.t) {
+      c -= a[i]
+      r[i++] = c & self.DM
+      c >>= self.DB
+    }
+    c -= a.s
+  }
+  r.s = (c < 0) ? -1 : 0
+  if (c < -1) r[i++] = self.DV + c
+  else if (c > 0) r[i++] = c
+  r.t = i
+  r.clamp()
+}
+
+// (protected) r = this * a, r != this,a (HAC 14.12)
+// "this" should be the larger one if appropriate.
+function bnpMultiplyTo(a, r) {
+  var x = this.abs(),
+    y = a.abs()
+  var i = x.t
+  r.t = i + y.t
+  while (--i >= 0) r[i] = 0
+  for (i = 0; i < y.t; ++i) r[i + x.t] = x.am(0, y[i], r, i, 0, x.t)
+  r.s = 0
+  r.clamp()
+  if (this.s != a.s) BigInteger.ZERO.subTo(r, r)
+}
+
+// (protected) r = this^2, r != this (HAC 14.16)
+function bnpSquareTo(r) {
+  var x = this.abs()
+  var i = r.t = 2 * x.t
+  while (--i >= 0) r[i] = 0
+  for (i = 0; i < x.t - 1; ++i) {
+    var c = x.am(i, x[i], r, 2 * i, 0, 1)
+    if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) {
+      r[i + x.t] -= x.DV
+      r[i + x.t + 1] = 1
+    }
+  }
+  if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1)
+  r.s = 0
+  r.clamp()
+}
+
+// (protected) divide this by m, quotient and remainder to q, r (HAC 14.20)
+// r != q, this != m.  q or r may be null.
+function bnpDivRemTo(m, q, r) {
+  var self = this
+  var pm = m.abs()
+  if (pm.t <= 0) return
+  var pt = self.abs()
+  if (pt.t < pm.t) {
+    if (q != null) q.fromInt(0)
+    if (r != null) self.copyTo(r)
+    return
+  }
+  if (r == null) r = new BigInteger()
+  var y = new BigInteger(),
+    ts = self.s,
+    ms = m.s
+  var nsh = self.DB - nbits(pm[pm.t - 1]); // normalize modulus
+  if (nsh > 0) {
+    pm.lShiftTo(nsh, y)
+    pt.lShiftTo(nsh, r)
+  } else {
+    pm.copyTo(y)
+    pt.copyTo(r)
+  }
+  var ys = y.t
+  var y0 = y[ys - 1]
+  if (y0 == 0) return
+  var yt = y0 * (1 << self.F1) + ((ys > 1) ? y[ys - 2] >> self.F2 : 0)
+  var d1 = self.FV / yt,
+    d2 = (1 << self.F1) / yt,
+    e = 1 << self.F2
+  var i = r.t,
+    j = i - ys,
+    t = (q == null) ? new BigInteger() : q
+  y.dlShiftTo(j, t)
+  if (r.compareTo(t) >= 0) {
+    r[r.t++] = 1
+    r.subTo(t, r)
+  }
+  BigInteger.ONE.dlShiftTo(ys, t)
+  t.subTo(y, y); // "negative" y so we can replace sub with am later
+  while (y.t < ys) y[y.t++] = 0
+  while (--j >= 0) {
+    // Estimate quotient digit
+    var qd = (r[--i] == y0) ? self.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2)
+    if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) { // Try it out
+      y.dlShiftTo(j, t)
+      r.subTo(t, r)
+      while (r[i] < --qd) r.subTo(t, r)
+    }
+  }
+  if (q != null) {
+    r.drShiftTo(ys, q)
+    if (ts != ms) BigInteger.ZERO.subTo(q, q)
+  }
+  r.t = ys
+  r.clamp()
+  if (nsh > 0) r.rShiftTo(nsh, r); // Denormalize remainder
+  if (ts < 0) BigInteger.ZERO.subTo(r, r)
+}
+
+// (public) this mod a
+function bnMod(a) {
+  var r = new BigInteger()
+  this.abs()
+    .divRemTo(a, null, r)
+  if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r)
+  return r
+}
+
+// Modular reduction using "classic" algorithm
+function Classic(m) {
+  this.m = m
+}
+
+function cConvert(x) {
+  if (x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m)
+  else return x
+}
+
+function cRevert(x) {
+  return x
+}
+
+function cReduce(x) {
+  x.divRemTo(this.m, null, x)
+}
+
+function cMulTo(x, y, r) {
+  x.multiplyTo(y, r)
+  this.reduce(r)
+}
+
+function cSqrTo(x, r) {
+  x.squareTo(r)
+  this.reduce(r)
+}
+
+Classic.prototype.convert = cConvert
+Classic.prototype.revert = cRevert
+Classic.prototype.reduce = cReduce
+Classic.prototype.mulTo = cMulTo
+Classic.prototype.sqrTo = cSqrTo
+
+// (protected) return "-1/this % 2^DB"; useful for Mont. reduction
+// justification:
+//         xy == 1 (mod m)
+//         xy =  1+km
+//   xy(2-xy) = (1+km)(1-km)
+// x[y(2-xy)] = 1-k^2m^2
+// x[y(2-xy)] == 1 (mod m^2)
+// if y is 1/x mod m, then y(2-xy) is 1/x mod m^2
+// should reduce x and y(2-xy) by m^2 at each step to keep size bounded.
+// JS multiply "overflows" differently from C/C++, so care is needed here.
+function bnpInvDigit() {
+  if (this.t < 1) return 0
+  var x = this[0]
+  if ((x & 1) == 0) return 0
+  var y = x & 3; // y == 1/x mod 2^2
+  y = (y * (2 - (x & 0xf) * y)) & 0xf; // y == 1/x mod 2^4
+  y = (y * (2 - (x & 0xff) * y)) & 0xff; // y == 1/x mod 2^8
+  y = (y * (2 - (((x & 0xffff) * y) & 0xffff))) & 0xffff; // y == 1/x mod 2^16
+  // last step - calculate inverse mod DV directly
+  // assumes 16 < DB <= 32 and assumes ability to handle 48-bit ints
+  y = (y * (2 - x * y % this.DV)) % this.DV; // y == 1/x mod 2^dbits
+  // we really want the negative inverse, and -DV < y < DV
+  return (y > 0) ? this.DV - y : -y
+}
+
+// Montgomery reduction
+function Montgomery(m) {
+  this.m = m
+  this.mp = m.invDigit()
+  this.mpl = this.mp & 0x7fff
+  this.mph = this.mp >> 15
+  this.um = (1 << (m.DB - 15)) - 1
+  this.mt2 = 2 * m.t
+}
+
+// xR mod m
+function montConvert(x) {
+  var r = new BigInteger()
+  x.abs()
+    .dlShiftTo(this.m.t, r)
+  r.divRemTo(this.m, null, r)
+  if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r)
+  return r
+}
+
+// x/R mod m
+function montRevert(x) {
+  var r = new BigInteger()
+  x.copyTo(r)
+  this.reduce(r)
+  return r
+}
+
+// x = x/R mod m (HAC 14.32)
+function montReduce(x) {
+  while (x.t <= this.mt2) // pad x so am has enough room later
+    x[x.t++] = 0
+  for (var i = 0; i < this.m.t; ++i) {
+    // faster way of calculating u0 = x[i]*mp mod DV
+    var j = x[i] & 0x7fff
+    var u0 = (j * this.mpl + (((j * this.mph + (x[i] >> 15) * this.mpl) & this.um) << 15)) & x.DM
+    // use am to combine the multiply-shift-add into one call
+    j = i + this.m.t
+    x[j] += this.m.am(0, u0, x, i, 0, this.m.t)
+    // propagate carry
+    while (x[j] >= x.DV) {
+      x[j] -= x.DV
+      x[++j]++
+    }
+  }
+  x.clamp()
+  x.drShiftTo(this.m.t, x)
+  if (x.compareTo(this.m) >= 0) x.subTo(this.m, x)
+}
+
+// r = "x^2/R mod m"; x != r
+function montSqrTo(x, r) {
+  x.squareTo(r)
+  this.reduce(r)
+}
+
+// r = "xy/R mod m"; x,y != r
+function montMulTo(x, y, r) {
+  x.multiplyTo(y, r)
+  this.reduce(r)
+}
+
+Montgomery.prototype.convert = montConvert
+Montgomery.prototype.revert = montRevert
+Montgomery.prototype.reduce = montReduce
+Montgomery.prototype.mulTo = montMulTo
+Montgomery.prototype.sqrTo = montSqrTo
+
+// (protected) true iff this is even
+function bnpIsEven() {
+  return ((this.t > 0) ? (this[0] & 1) : this.s) == 0
+}
+
+// (protected) this^e, e < 2^32, doing sqr and mul with "r" (HAC 14.79)
+function bnpExp(e, z) {
+  if (e > 0xffffffff || e < 1) return BigInteger.ONE
+  var r = new BigInteger(),
+    r2 = new BigInteger(),
+    g = z.convert(this),
+    i = nbits(e) - 1
+  g.copyTo(r)
+  while (--i >= 0) {
+    z.sqrTo(r, r2)
+    if ((e & (1 << i)) > 0) z.mulTo(r2, g, r)
+    else {
+      var t = r
+      r = r2
+      r2 = t
+    }
+  }
+  return z.revert(r)
+}
+
+// (public) this^e % m, 0 <= e < 2^32
+function bnModPowInt(e, m) {
+  var z
+  if (e < 256 || m.isEven()) z = new Classic(m)
+  else z = new Montgomery(m)
+  return this.exp(e, z)
+}
+
+// protected
+proto.copyTo = bnpCopyTo
+proto.fromInt = bnpFromInt
+proto.fromString = bnpFromString
+proto.clamp = bnpClamp
+proto.dlShiftTo = bnpDLShiftTo
+proto.drShiftTo = bnpDRShiftTo
+proto.lShiftTo = bnpLShiftTo
+proto.rShiftTo = bnpRShiftTo
+proto.subTo = bnpSubTo
+proto.multiplyTo = bnpMultiplyTo
+proto.squareTo = bnpSquareTo
+proto.divRemTo = bnpDivRemTo
+proto.invDigit = bnpInvDigit
+proto.isEven = bnpIsEven
+proto.exp = bnpExp
+
+// public
+proto.toString = bnToString
+proto.negate = bnNegate
+proto.abs = bnAbs
+proto.compareTo = bnCompareTo
+proto.bitLength = bnBitLength
+proto.byteLength = bnByteLength
+proto.mod = bnMod
+proto.modPowInt = bnModPowInt
+
+// (public)
+function bnClone() {
+  var r = new BigInteger()
+  this.copyTo(r)
+  return r
+}
+
+// (public) return value as integer
+function bnIntValue() {
+  if (this.s < 0) {
+    if (this.t == 1) return this[0] - this.DV
+    else if (this.t == 0) return -1
+  } else if (this.t == 1) return this[0]
+  else if (this.t == 0) return 0
+  // assumes 16 < DB < 32
+  return ((this[1] & ((1 << (32 - this.DB)) - 1)) << this.DB) | this[0]
+}
+
+// (public) return value as byte
+function bnByteValue() {
+  return (this.t == 0) ? this.s : (this[0] << 24) >> 24
+}
+
+// (public) return value as short (assumes DB>=16)
+function bnShortValue() {
+  return (this.t == 0) ? this.s : (this[0] << 16) >> 16
+}
+
+// (protected) return x s.t. r^x < DV
+function bnpChunkSize(r) {
+  return Math.floor(Math.LN2 * this.DB / Math.log(r))
+}
+
+// (public) 0 if this == 0, 1 if this > 0
+function bnSigNum() {
+  if (this.s < 0) return -1
+  else if (this.t <= 0 || (this.t == 1 && this[0] <= 0)) return 0
+  else return 1
+}
+
+// (protected) convert to radix string
+function bnpToRadix(b) {
+  if (b == null) b = 10
+  if (this.signum() == 0 || b < 2 || b > 36) return "0"
+  var cs = this.chunkSize(b)
+  var a = Math.pow(b, cs)
+  var d = nbv(a),
+    y = new BigInteger(),
+    z = new BigInteger(),
+    r = ""
+  this.divRemTo(d, y, z)
+  while (y.signum() > 0) {
+    r = (a + z.intValue())
+      .toString(b)
+      .substr(1) + r
+    y.divRemTo(d, y, z)
+  }
+  return z.intValue()
+    .toString(b) + r
+}
+
+// (protected) convert from radix string
+function bnpFromRadix(s, b) {
+  var self = this
+  self.fromInt(0)
+  if (b == null) b = 10
+  var cs = self.chunkSize(b)
+  var d = Math.pow(b, cs),
+    mi = false,
+    j = 0,
+    w = 0
+  for (var i = 0; i < s.length; ++i) {
+    var x = intAt(s, i)
+    if (x < 0) {
+      if (s.charAt(i) == "-" && self.signum() == 0) mi = true
+      continue
+    }
+    w = b * w + x
+    if (++j >= cs) {
+      self.dMultiply(d)
+      self.dAddOffset(w, 0)
+      j = 0
+      w = 0
+    }
+  }
+  if (j > 0) {
+    self.dMultiply(Math.pow(b, j))
+    self.dAddOffset(w, 0)
+  }
+  if (mi) BigInteger.ZERO.subTo(self, self)
+}
+
+// (protected) alternate constructor
+function bnpFromNumber(a, b, c) {
+  var self = this
+  if ("number" == typeof b) {
+    // new BigInteger(int,int,RNG)
+    if (a < 2) self.fromInt(1)
+    else {
+      self.fromNumber(a, c)
+      if (!self.testBit(a - 1)) // force MSB set
+        self.bitwiseTo(BigInteger.ONE.shiftLeft(a - 1), op_or, self)
+      if (self.isEven()) self.dAddOffset(1, 0); // force odd
+      while (!self.isProbablePrime(b)) {
+        self.dAddOffset(2, 0)
+        if (self.bitLength() > a) self.subTo(BigInteger.ONE.shiftLeft(a - 1), self)
+      }
+    }
+  } else {
+    // new BigInteger(int,RNG)
+    var x = new Array(),
+      t = a & 7
+    x.length = (a >> 3) + 1
+    b.nextBytes(x)
+    if (t > 0) x[0] &= ((1 << t) - 1)
+    else x[0] = 0
+    self.fromString(x, 256)
+  }
+}
+
+// (public) convert to bigendian byte array
+function bnToByteArray() {
+  var self = this
+  var i = self.t,
+    r = new Array()
+  r[0] = self.s
+  var p = self.DB - (i * self.DB) % 8,
+    d, k = 0
+  if (i-- > 0) {
+    if (p < self.DB && (d = self[i] >> p) != (self.s & self.DM) >> p)
+      r[k++] = d | (self.s << (self.DB - p))
+    while (i >= 0) {
+      if (p < 8) {
+        d = (self[i] & ((1 << p) - 1)) << (8 - p)
+        d |= self[--i] >> (p += self.DB - 8)
+      } else {
+        d = (self[i] >> (p -= 8)) & 0xff
+        if (p <= 0) {
+          p += self.DB
+          --i
+        }
+      }
+      if ((d & 0x80) != 0) d |= -256
+      if (k === 0 && (self.s & 0x80) != (d & 0x80))++k
+      if (k > 0 || d != self.s) r[k++] = d
+    }
+  }
+  return r
+}
+
+function bnEquals(a) {
+  return (this.compareTo(a) == 0)
+}
+
+function bnMin(a) {
+  return (this.compareTo(a) < 0) ? this : a
+}
+
+function bnMax(a) {
+  return (this.compareTo(a) > 0) ? this : a
+}
+
+// (protected) r = this op a (bitwise)
+function bnpBitwiseTo(a, op, r) {
+  var self = this
+  var i, f, m = Math.min(a.t, self.t)
+  for (i = 0; i < m; ++i) r[i] = op(self[i], a[i])
+  if (a.t < self.t) {
+    f = a.s & self.DM
+    for (i = m; i < self.t; ++i) r[i] = op(self[i], f)
+    r.t = self.t
+  } else {
+    f = self.s & self.DM
+    for (i = m; i < a.t; ++i) r[i] = op(f, a[i])
+    r.t = a.t
+  }
+  r.s = op(self.s, a.s)
+  r.clamp()
+}
+
+// (public) this & a
+function op_and(x, y) {
+  return x & y
+}
+
+function bnAnd(a) {
+  var r = new BigInteger()
+  this.bitwiseTo(a, op_and, r)
+  return r
+}
+
+// (public) this | a
+function op_or(x, y) {
+  return x | y
+}
+
+function bnOr(a) {
+  var r = new BigInteger()
+  this.bitwiseTo(a, op_or, r)
+  return r
+}
+
+// (public) this ^ a
+function op_xor(x, y) {
+  return x ^ y
+}
+
+function bnXor(a) {
+  var r = new BigInteger()
+  this.bitwiseTo(a, op_xor, r)
+  return r
+}
+
+// (public) this & ~a
+function op_andnot(x, y) {
+  return x & ~y
+}
+
+function bnAndNot(a) {
+  var r = new BigInteger()
+  this.bitwiseTo(a, op_andnot, r)
+  return r
+}
+
+// (public) ~this
+function bnNot() {
+  var r = new BigInteger()
+  for (var i = 0; i < this.t; ++i) r[i] = this.DM & ~this[i]
+  r.t = this.t
+  r.s = ~this.s
+  return r
+}
+
+// (public) this << n
+function bnShiftLeft(n) {
+  var r = new BigInteger()
+  if (n < 0) this.rShiftTo(-n, r)
+  else this.lShiftTo(n, r)
+  return r
+}
+
+// (public) this >> n
+function bnShiftRight(n) {
+  var r = new BigInteger()
+  if (n < 0) this.lShiftTo(-n, r)
+  else this.rShiftTo(n, r)
+  return r
+}
+
+// return index of lowest 1-bit in x, x < 2^31
+function lbit(x) {
+  if (x == 0) return -1
+  var r = 0
+  if ((x & 0xffff) == 0) {
+    x >>= 16
+    r += 16
+  }
+  if ((x & 0xff) == 0) {
+    x >>= 8
+    r += 8
+  }
+  if ((x & 0xf) == 0) {
+    x >>= 4
+    r += 4
+  }
+  if ((x & 3) == 0) {
+    x >>= 2
+    r += 2
+  }
+  if ((x & 1) == 0)++r
+  return r
+}
+
+// (public) returns index of lowest 1-bit (or -1 if none)
+function bnGetLowestSetBit() {
+  for (var i = 0; i < this.t; ++i)
+    if (this[i] != 0) return i * this.DB + lbit(this[i])
+  if (this.s < 0) return this.t * this.DB
+  return -1
+}
+
+// return number of 1 bits in x
+function cbit(x) {
+  var r = 0
+  while (x != 0) {
+    x &= x - 1
+    ++r
+  }
+  return r
+}
+
+// (public) return number of set bits
+function bnBitCount() {
+  var r = 0,
+    x = this.s & this.DM
+  for (var i = 0; i < this.t; ++i) r += cbit(this[i] ^ x)
+  return r
+}
+
+// (public) true iff nth bit is set
+function bnTestBit(n) {
+  var j = Math.floor(n / this.DB)
+  if (j >= this.t) return (this.s != 0)
+  return ((this[j] & (1 << (n % this.DB))) != 0)
+}
+
+// (protected) this op (1<<n)
+function bnpChangeBit(n, op) {
+  var r = BigInteger.ONE.shiftLeft(n)
+  this.bitwiseTo(r, op, r)
+  return r
+}
+
+// (public) this | (1<<n)
+function bnSetBit(n) {
+  return this.changeBit(n, op_or)
+}
+
+// (public) this & ~(1<<n)
+function bnClearBit(n) {
+  return this.changeBit(n, op_andnot)
+}
+
+// (public) this ^ (1<<n)
+function bnFlipBit(n) {
+  return this.changeBit(n, op_xor)
+}
+
+// (protected) r = this + a
+function bnpAddTo(a, r) {
+  var self = this
+
+  var i = 0,
+    c = 0,
+    m = Math.min(a.t, self.t)
+  while (i < m) {
+    c += self[i] + a[i]
+    r[i++] = c & self.DM
+    c >>= self.DB
+  }
+  if (a.t < self.t) {
+    c += a.s
+    while (i < self.t) {
+      c += self[i]
+      r[i++] = c & self.DM
+      c >>= self.DB
+    }
+    c += self.s
+  } else {
+    c += self.s
+    while (i < a.t) {
+      c += a[i]
+      r[i++] = c & self.DM
+      c >>= self.DB
+    }
+    c += a.s
+  }
+  r.s = (c < 0) ? -1 : 0
+  if (c > 0) r[i++] = c
+  else if (c < -1) r[i++] = self.DV + c
+  r.t = i
+  r.clamp()
+}
+
+// (public) this + a
+function bnAdd(a) {
+  var r = new BigInteger()
+  this.addTo(a, r)
+  return r
+}
+
+// (public) this - a
+function bnSubtract(a) {
+  var r = new BigInteger()
+  this.subTo(a, r)
+  return r
+}
+
+// (public) this * a
+function bnMultiply(a) {
+  var r = new BigInteger()
+  this.multiplyTo(a, r)
+  return r
+}
+
+// (public) this^2
+function bnSquare() {
+  var r = new BigInteger()
+  this.squareTo(r)
+  return r
+}
+
+// (public) this / a
+function bnDivide(a) {
+  var r = new BigInteger()
+  this.divRemTo(a, r, null)
+  return r
+}
+
+// (public) this % a
+function bnRemainder(a) {
+  var r = new BigInteger()
+  this.divRemTo(a, null, r)
+  return r
+}
+
+// (public) [this/a,this%a]
+function bnDivideAndRemainder(a) {
+  var q = new BigInteger(),
+    r = new BigInteger()
+  this.divRemTo(a, q, r)
+  return new Array(q, r)
+}
+
+// (protected) this *= n, this >= 0, 1 < n < DV
+function bnpDMultiply(n) {
+  this[this.t] = this.am(0, n - 1, this, 0, 0, this.t)
+  ++this.t
+  this.clamp()
+}
+
+// (protected) this += n << w words, this >= 0
+function bnpDAddOffset(n, w) {
+  if (n == 0) return
+  while (this.t <= w) this[this.t++] = 0
+  this[w] += n
+  while (this[w] >= this.DV) {
+    this[w] -= this.DV
+    if (++w >= this.t) this[this.t++] = 0
+    ++this[w]
+  }
+}
+
+// A "null" reducer
+function NullExp() {}
+
+function nNop(x) {
+  return x
+}
+
+function nMulTo(x, y, r) {
+  x.multiplyTo(y, r)
+}
+
+function nSqrTo(x, r) {
+  x.squareTo(r)
+}
+
+NullExp.prototype.convert = nNop
+NullExp.prototype.revert = nNop
+NullExp.prototype.mulTo = nMulTo
+NullExp.prototype.sqrTo = nSqrTo
+
+// (public) this^e
+function bnPow(e) {
+  return this.exp(e, new NullExp())
+}
+
+// (protected) r = lower n words of "this * a", a.t <= n
+// "this" should be the larger one if appropriate.
+function bnpMultiplyLowerTo(a, n, r) {
+  var i = Math.min(this.t + a.t, n)
+  r.s = 0; // assumes a,this >= 0
+  r.t = i
+  while (i > 0) r[--i] = 0
+  var j
+  for (j = r.t - this.t; i < j; ++i) r[i + this.t] = this.am(0, a[i], r, i, 0, this.t)
+  for (j = Math.min(a.t, n); i < j; ++i) this.am(0, a[i], r, i, 0, n - i)
+  r.clamp()
+}
+
+// (protected) r = "this * a" without lower n words, n > 0
+// "this" should be the larger one if appropriate.
+function bnpMultiplyUpperTo(a, n, r) {
+  --n
+  var i = r.t = this.t + a.t - n
+  r.s = 0; // assumes a,this >= 0
+  while (--i >= 0) r[i] = 0
+  for (i = Math.max(n - this.t, 0); i < a.t; ++i)
+    r[this.t + i - n] = this.am(n - i, a[i], r, 0, 0, this.t + i - n)
+  r.clamp()
+  r.drShiftTo(1, r)
+}
+
+// Barrett modular reduction
+function Barrett(m) {
+  // setup Barrett
+  this.r2 = new BigInteger()
+  this.q3 = new BigInteger()
+  BigInteger.ONE.dlShiftTo(2 * m.t, this.r2)
+  this.mu = this.r2.divide(m)
+  this.m = m
+}
+
+function barrettConvert(x) {
+  if (x.s < 0 || x.t > 2 * this.m.t) return x.mod(this.m)
+  else if (x.compareTo(this.m) < 0) return x
+  else {
+    var r = new BigInteger()
+    x.copyTo(r)
+    this.reduce(r)
+    return r
+  }
+}
+
+function barrettRevert(x) {
+  return x
+}
+
+// x = x mod m (HAC 14.42)
+function barrettReduce(x) {
+  var self = this
+  x.drShiftTo(self.m.t - 1, self.r2)
+  if (x.t > self.m.t + 1) {
+    x.t = self.m.t + 1
+    x.clamp()
+  }
+  self.mu.multiplyUpperTo(self.r2, self.m.t + 1, self.q3)
+  self.m.multiplyLowerTo(self.q3, self.m.t + 1, self.r2)
+  while (x.compareTo(self.r2) < 0) x.dAddOffset(1, self.m.t + 1)
+  x.subTo(self.r2, x)
+  while (x.compareTo(self.m) >= 0) x.subTo(self.m, x)
+}
+
+// r = x^2 mod m; x != r
+function barrettSqrTo(x, r) {
+  x.squareTo(r)
+  this.reduce(r)
+}
+
+// r = x*y mod m; x,y != r
+function barrettMulTo(x, y, r) {
+  x.multiplyTo(y, r)
+  this.reduce(r)
+}
+
+Barrett.prototype.convert = barrettConvert
+Barrett.prototype.revert = barrettRevert
+Barrett.prototype.reduce = barrettReduce
+Barrett.prototype.mulTo = barrettMulTo
+Barrett.prototype.sqrTo = barrettSqrTo
+
+// (public) this^e % m (HAC 14.85)
+function bnModPow(e, m) {
+  var i = e.bitLength(),
+    k, r = nbv(1),
+    z
+  if (i <= 0) return r
+  else if (i < 18) k = 1
+  else if (i < 48) k = 3
+  else if (i < 144) k = 4
+  else if (i < 768) k = 5
+  else k = 6
+  if (i < 8)
+    z = new Classic(m)
+  else if (m.isEven())
+    z = new Barrett(m)
+  else
+    z = new Montgomery(m)
+
+  // precomputation
+  var g = new Array(),
+    n = 3,
+    k1 = k - 1,
+    km = (1 << k) - 1
+  g[1] = z.convert(this)
+  if (k > 1) {
+    var g2 = new BigInteger()
+    z.sqrTo(g[1], g2)
+    while (n <= km) {
+      g[n] = new BigInteger()
+      z.mulTo(g2, g[n - 2], g[n])
+      n += 2
+    }
+  }
+
+  var j = e.t - 1,
+    w, is1 = true,
+    r2 = new BigInteger(),
+    t
+  i = nbits(e[j]) - 1
+  while (j >= 0) {
+    if (i >= k1) w = (e[j] >> (i - k1)) & km
+    else {
+      w = (e[j] & ((1 << (i + 1)) - 1)) << (k1 - i)
+      if (j > 0) w |= e[j - 1] >> (this.DB + i - k1)
+    }
+
+    n = k
+    while ((w & 1) == 0) {
+      w >>= 1
+      --n
+    }
+    if ((i -= n) < 0) {
+      i += this.DB
+      --j
+    }
+    if (is1) { // ret == 1, don't bother squaring or multiplying it
+      g[w].copyTo(r)
+      is1 = false
+    } else {
+      while (n > 1) {
+        z.sqrTo(r, r2)
+        z.sqrTo(r2, r)
+        n -= 2
+      }
+      if (n > 0) z.sqrTo(r, r2)
+      else {
+        t = r
+        r = r2
+        r2 = t
+      }
+      z.mulTo(r2, g[w], r)
+    }
+
+    while (j >= 0 && (e[j] & (1 << i)) == 0) {
+      z.sqrTo(r, r2)
+      t = r
+      r = r2
+      r2 = t
+      if (--i < 0) {
+        i = this.DB - 1
+        --j
+      }
+    }
+  }
+  return z.revert(r)
+}
+
+// (public) gcd(this,a) (HAC 14.54)
+function bnGCD(a) {
+  var x = (this.s < 0) ? this.negate() : this.clone()
+  var y = (a.s < 0) ? a.negate() : a.clone()
+  if (x.compareTo(y) < 0) {
+    var t = x
+    x = y
+    y = t
+  }
+  var i = x.getLowestSetBit(),
+    g = y.getLowestSetBit()
+  if (g < 0) return x
+  if (i < g) g = i
+  if (g > 0) {
+    x.rShiftTo(g, x)
+    y.rShiftTo(g, y)
+  }
+  while (x.signum() > 0) {
+    if ((i = x.getLowestSetBit()) > 0) x.rShiftTo(i, x)
+    if ((i = y.getLowestSetBit()) > 0) y.rShiftTo(i, y)
+    if (x.compareTo(y) >= 0) {
+      x.subTo(y, x)
+      x.rShiftTo(1, x)
+    } else {
+      y.subTo(x, y)
+      y.rShiftTo(1, y)
+    }
+  }
+  if (g > 0) y.lShiftTo(g, y)
+  return y
+}
+
+// (protected) this % n, n < 2^26
+function bnpModInt(n) {
+  if (n <= 0) return 0
+  var d = this.DV % n,
+    r = (this.s < 0) ? n - 1 : 0
+  if (this.t > 0)
+    if (d == 0) r = this[0] % n
+    else
+      for (var i = this.t - 1; i >= 0; --i) r = (d * r + this[i]) % n
+  return r
+}
+
+// (public) 1/this % m (HAC 14.61)
+function bnModInverse(m) {
+  var ac = m.isEven()
+  if (this.signum() === 0) throw new Error('division by zero')
+  if ((this.isEven() && ac) || m.signum() == 0) return BigInteger.ZERO
+  var u = m.clone(),
+    v = this.clone()
+  var a = nbv(1),
+    b = nbv(0),
+    c = nbv(0),
+    d = nbv(1)
+  while (u.signum() != 0) {
+    while (u.isEven()) {
+      u.rShiftTo(1, u)
+      if (ac) {
+        if (!a.isEven() || !b.isEven()) {
+          a.addTo(this, a)
+          b.subTo(m, b)
+        }
+        a.rShiftTo(1, a)
+      } else if (!b.isEven()) b.subTo(m, b)
+      b.rShiftTo(1, b)
+    }
+    while (v.isEven()) {
+      v.rShiftTo(1, v)
+      if (ac) {
+        if (!c.isEven() || !d.isEven()) {
+          c.addTo(this, c)
+          d.subTo(m, d)
+        }
+        c.rShiftTo(1, c)
+      } else if (!d.isEven()) d.subTo(m, d)
+      d.rShiftTo(1, d)
+    }
+    if (u.compareTo(v) >= 0) {
+      u.subTo(v, u)
+      if (ac) a.subTo(c, a)
+      b.subTo(d, b)
+    } else {
+      v.subTo(u, v)
+      if (ac) c.subTo(a, c)
+      d.subTo(b, d)
+    }
+  }
+  if (v.compareTo(BigInteger.ONE) != 0) return BigInteger.ZERO
+  while (d.compareTo(m) >= 0) d.subTo(m, d)
+  while (d.signum() < 0) d.addTo(m, d)
+  return d
+}
+
+var lowprimes = [
+  2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
+  73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
+  157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233,
+  239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317,
+  331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419,
+  421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
+  509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607,
+  613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
+  709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811,
+  821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911,
+  919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
+]
+
+var lplim = (1 << 26) / lowprimes[lowprimes.length - 1]
+
+// (public) test primality with certainty >= 1-.5^t
+function bnIsProbablePrime(t) {
+  var i, x = this.abs()
+  if (x.t == 1 && x[0] <= lowprimes[lowprimes.length - 1]) {
+    for (i = 0; i < lowprimes.length; ++i)
+      if (x[0] == lowprimes[i]) return true
+    return false
+  }
+  if (x.isEven()) return false
+  i = 1
+  while (i < lowprimes.length) {
+    var m = lowprimes[i],
+      j = i + 1
+    while (j < lowprimes.length && m < lplim) m *= lowprimes[j++]
+    m = x.modInt(m)
+    while (i < j) if (m % lowprimes[i++] == 0) return false
+  }
+  return x.millerRabin(t)
+}
+
+// (protected) true if probably prime (HAC 4.24, Miller-Rabin)
+function bnpMillerRabin(t) {
+  var n1 = this.subtract(BigInteger.ONE)
+  var k = n1.getLowestSetBit()
+  if (k <= 0) return false
+  var r = n1.shiftRight(k)
+  t = (t + 1) >> 1
+  if (t > lowprimes.length) t = lowprimes.length
+  var a = new BigInteger(null)
+  var j, bases = []
+  for (var i = 0; i < t; ++i) {
+    for (;;) {
+      j = lowprimes[Math.floor(Math.random() * lowprimes.length)]
+      if (bases.indexOf(j) == -1) break
+    }
+    bases.push(j)
+    a.fromInt(j)
+    var y = a.modPow(r, this)
+    if (y.compareTo(BigInteger.ONE) != 0 && y.compareTo(n1) != 0) {
+      var j = 1
+      while (j++ < k && y.compareTo(n1) != 0) {
+        y = y.modPowInt(2, this)
+        if (y.compareTo(BigInteger.ONE) == 0) return false
+      }
+      if (y.compareTo(n1) != 0) return false
+    }
+  }
+  return true
+}
+
+// protected
+proto.chunkSize = bnpChunkSize
+proto.toRadix = bnpToRadix
+proto.fromRadix = bnpFromRadix
+proto.fromNumber = bnpFromNumber
+proto.bitwiseTo = bnpBitwiseTo
+proto.changeBit = bnpChangeBit
+proto.addTo = bnpAddTo
+proto.dMultiply = bnpDMultiply
+proto.dAddOffset = bnpDAddOffset
+proto.multiplyLowerTo = bnpMultiplyLowerTo
+proto.multiplyUpperTo = bnpMultiplyUpperTo
+proto.modInt = bnpModInt
+proto.millerRabin = bnpMillerRabin
+
+// public
+proto.clone = bnClone
+proto.intValue = bnIntValue
+proto.byteValue = bnByteValue
+proto.shortValue = bnShortValue
+proto.signum = bnSigNum
+proto.toByteArray = bnToByteArray
+proto.equals = bnEquals
+proto.min = bnMin
+proto.max = bnMax
+proto.and = bnAnd
+proto.or = bnOr
+proto.xor = bnXor
+proto.andNot = bnAndNot
+proto.not = bnNot
+proto.shiftLeft = bnShiftLeft
+proto.shiftRight = bnShiftRight
+proto.getLowestSetBit = bnGetLowestSetBit
+proto.bitCount = bnBitCount
+proto.testBit = bnTestBit
+proto.setBit = bnSetBit
+proto.clearBit = bnClearBit
+proto.flipBit = bnFlipBit
+proto.add = bnAdd
+proto.subtract = bnSubtract
+proto.multiply = bnMultiply
+proto.divide = bnDivide
+proto.remainder = bnRemainder
+proto.divideAndRemainder = bnDivideAndRemainder
+proto.modPow = bnModPow
+proto.modInverse = bnModInverse
+proto.pow = bnPow
+proto.gcd = bnGCD
+proto.isProbablePrime = bnIsProbablePrime
+
+// JSBN-specific extension
+proto.square = bnSquare
+
+// constants
+BigInteger.ZERO = nbv(0)
+BigInteger.ONE = nbv(1)
+BigInteger.valueOf = nbv
+
+module.exports = BigInteger
+
+},{"../package.json":38}],36:[function(require,module,exports){
+(function (Buffer){
+// FIXME: Kind of a weird way to throw exceptions, consider removing
+var assert = require('assert')
+var BigInteger = require('./bigi')
+
+/**
+ * Turns a byte array into a big integer.
+ *
+ * This function will interpret a byte array as a big integer in big
+ * endian notation.
+ */
+BigInteger.fromByteArrayUnsigned = function(byteArray) {
+  // BigInteger expects a DER integer conformant byte array
+  if (byteArray[0] & 0x80) {
+    return new BigInteger([0].concat(byteArray))
+  }
+
+  return new BigInteger(byteArray)
+}
+
+/**
+ * Returns a byte array representation of the big integer.
+ *
+ * This returns the absolute of the contained value in big endian
+ * form. A value of zero results in an empty array.
+ */
+BigInteger.prototype.toByteArrayUnsigned = function() {
+  var byteArray = this.toByteArray()
+  return byteArray[0] === 0 ? byteArray.slice(1) : byteArray
+}
+
+BigInteger.fromDERInteger = function(byteArray) {
+  return new BigInteger(byteArray)
+}
+
+/*
+ * Converts BigInteger to a DER integer representation.
+ *
+ * The format for this value uses the most significant bit as a sign
+ * bit.  If the most significant bit is already set and the integer is
+ * positive, a 0x00 is prepended.
+ *
+ * Examples:
+ *
+ *      0 =>     0x00
+ *      1 =>     0x01
+ *     -1 =>     0xff
+ *    127 =>     0x7f
+ *   -127 =>     0x81
+ *    128 =>   0x0080
+ *   -128 =>     0x80
+ *    255 =>   0x00ff
+ *   -255 =>   0xff01
+ *  16300 =>   0x3fac
+ * -16300 =>   0xc054
+ *  62300 => 0x00f35c
+ * -62300 => 0xff0ca4
+*/
+BigInteger.prototype.toDERInteger = BigInteger.prototype.toByteArray
+
+BigInteger.fromBuffer = function(buffer) {
+  // BigInteger expects a DER integer conformant byte array
+  if (buffer[0] & 0x80) {
+    var byteArray = Array.prototype.slice.call(buffer)
+
+    return new BigInteger([0].concat(byteArray))
+  }
+
+  return new BigInteger(buffer)
+}
+
+BigInteger.fromHex = function(hex) {
+  if (hex === '') return BigInteger.ZERO
+
+  assert.equal(hex, hex.match(/^[A-Fa-f0-9]+/), 'Invalid hex string')
+  assert.equal(hex.length % 2, 0, 'Incomplete hex')
+  return new BigInteger(hex, 16)
+}
+
+BigInteger.prototype.toBuffer = function(size) {
+  var byteArray = this.toByteArrayUnsigned()
+  var zeros = []
+
+  var padding = size - byteArray.length
+  while (zeros.length < padding) zeros.push(0)
+
+  return new Buffer(zeros.concat(byteArray))
+}
+
+BigInteger.prototype.toHex = function(size) {
+  return this.toBuffer(size).toString('hex')
+}
+
+}).call(this,require("buffer").Buffer)
+},{"./bigi":35,"assert":1,"buffer":4}],37:[function(require,module,exports){
+var BigInteger = require('./bigi')
+
+//addons
+require('./convert')
+
+module.exports = BigInteger
+},{"./bigi":35,"./convert":36}],38:[function(require,module,exports){
+module.exports={
+  "_args": [
+    [
+      "bigi",
+      "/home/ian/git/bitcoin/bitcoinjs-lib-browser"
+    ]
+  ],
+  "_from": "bigi@latest",
+  "_id": "bigi@1.4.2",
+  "_inCache": true,
+  "_installable": true,
+  "_location": "/bigi",
+  "_nodeVersion": "6.1.0",
+  "_npmOperationalInternal": {
+    "host": "packages-12-west.internal.npmjs.com",
+    "tmp": "tmp/bigi-1.4.2.tgz_1469584192413_0.6801238611806184"
+  },
+  "_npmUser": {
+    "email": "jprichardson@gmail.com",
+    "name": "jprichardson"
+  },
+  "_npmVersion": "3.8.6",
+  "_phantomChildren": {},
+  "_requested": {
+    "name": "bigi",
+    "raw": "bigi",
+    "rawSpec": "",
+    "scope": null,
+    "spec": "latest",
+    "type": "tag"
+  },
+  "_requiredBy": [
+    "#USER",
+    "/bitcoinjs-lib",
+    "/ecurve"
+  ],
+  "_resolved": "https://registry.npmjs.org/bigi/-/bigi-1.4.2.tgz",
+  "_shasum": "9c665a95f88b8b08fc05cfd731f561859d725825",
+  "_shrinkwrap": null,
+  "_spec": "bigi",
+  "_where": "/home/ian/git/bitcoin/bitcoinjs-lib-browser",
+  "bugs": {
+    "url": "https://github.com/cryptocoinjs/bigi/issues"
+  },
+  "dependencies": {},
+  "description": "Big integers.",
+  "devDependencies": {
+    "coveralls": "^2.11.2",
+    "istanbul": "^0.3.5",
+    "jshint": "^2.5.1",
+    "mocha": "^2.1.0",
+    "mochify": "^2.1.0"
+  },
+  "directories": {},
+  "dist": {
+    "shasum": "9c665a95f88b8b08fc05cfd731f561859d725825",
+    "tarball": "https://registry.npmjs.org/bigi/-/bigi-1.4.2.tgz"
+  },
+  "gitHead": "c25308081c896ff84702303722bf5ecd8b3f78e3",
+  "homepage": "https://github.com/cryptocoinjs/bigi#readme",
+  "keywords": [
+    "cryptography",
+    "math",
+    "bitcoin",
+    "arbitrary",
+    "precision",
+    "arithmetic",
+    "big",
+    "integer",
+    "int",
+    "number",
+    "biginteger",
+    "bigint",
+    "bignumber",
+    "decimal",
+    "float"
+  ],
+  "main": "./lib/index.js",
+  "maintainers": [
+    {
+      "email": "boydb@midnightdesign.ws",
+      "name": "midnightlightning"
+    },
+    {
+      "email": "sidazhang89@gmail.com",
+      "name": "sidazhang"
+    },
+    {
+      "email": "npm@shesek.info",
+      "name": "nadav"
+    },
+    {
+      "email": "jprichardson@gmail.com",
+      "name": "jprichardson"
+    }
+  ],
+  "name": "bigi",
+  "optionalDependencies": {},
+  "readme": "ERROR: No README data found!",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/cryptocoinjs/bigi.git"
+  },
+  "scripts": {
+    "browser-test": "mochify --wd -R spec",
+    "coverage": "istanbul cover ./node_modules/.bin/_mocha -- --reporter list test/*.js",
+    "coveralls": "npm run-script coverage && node ./node_modules/.bin/coveralls < coverage/lcov.info",
+    "jshint": "jshint --config jshint.json lib/*.js ; true",
+    "test": "_mocha -- test/*.js",
+    "unit": "mocha"
+  },
+  "testling": {
+    "browsers": [
+      "ie/9..latest",
+      "firefox/latest",
+      "chrome/latest",
+      "safari/6.0..latest",
+      "iphone/6.0..latest",
+      "android-browser/4.2..latest"
+    ],
+    "files": "test/*.js",
+    "harness": "mocha"
+  },
+  "version": "1.4.2"
+}
+
+},{}],39:[function(require,module,exports){
+// Reference https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki
+// Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
+// NOTE: SIGHASH byte ignored AND restricted, truncate before use
+
+var Buffer = require('safe-buffer').Buffer
+
+function check (buffer) {
+  if (buffer.length < 8) return false
+  if (buffer.length > 72) return false
+  if (buffer[0] !== 0x30) return false
+  if (buffer[1] !== buffer.length - 2) return false
+  if (buffer[2] !== 0x02) return false
+
+  var lenR = buffer[3]
+  if (lenR === 0) return false
+  if (5 + lenR >= buffer.length) return false
+  if (buffer[4 + lenR] !== 0x02) return false
+
+  var lenS = buffer[5 + lenR]
+  if (lenS === 0) return false
+  if ((6 + lenR + lenS) !== buffer.length) return false
+
+  if (buffer[4] & 0x80) return false
+  if (lenR > 1 && (buffer[4] === 0x00) && !(buffer[5] & 0x80)) return false
+
+  if (buffer[lenR + 6] & 0x80) return false
+  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR + 7] & 0x80)) return false
+  return true
+}
+
+function decode (buffer) {
+  if (buffer.length < 8) throw new Error('DER sequence length is too short')
+  if (buffer.length > 72) throw new Error('DER sequence length is too long')
+  if (buffer[0] !== 0x30) throw new Error('Expected DER sequence')
+  if (buffer[1] !== buffer.length - 2) throw new Error('DER sequence length is invalid')
+  if (buffer[2] !== 0x02) throw new Error('Expected DER integer')
+
+  var lenR = buffer[3]
+  if (lenR === 0) throw new Error('R length is zero')
+  if (5 + lenR >= buffer.length) throw new Error('R length is too long')
+  if (buffer[4 + lenR] !== 0x02) throw new Error('Expected DER integer (2)')
+
+  var lenS = buffer[5 + lenR]
+  if (lenS === 0) throw new Error('S length is zero')
+  if ((6 + lenR + lenS) !== buffer.length) throw new Error('S length is invalid')
+
+  if (buffer[4] & 0x80) throw new Error('R value is negative')
+  if (lenR > 1 && (buffer[4] === 0x00) && !(buffer[5] & 0x80)) throw new Error('R value excessively padded')
+
+  if (buffer[lenR + 6] & 0x80) throw new Error('S value is negative')
+  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR + 7] & 0x80)) throw new Error('S value excessively padded')
+
+  // non-BIP66 - extract R, S values
+  return {
+    r: buffer.slice(4, 4 + lenR),
+    s: buffer.slice(6 + lenR)
   }
-  // set default options
-  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-  if (isUndefined(ctx.depth)) ctx.depth = 2;
-  if (isUndefined(ctx.colors)) ctx.colors = false;
-  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-  if (ctx.colors) ctx.stylize = stylizeWithColor;
-  return formatValue(ctx, obj, ctx.depth);
 }
-exports.inspect = inspect;
-
 
-// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-inspect.colors = {
-  'bold' : [1, 22],
-  'italic' : [3, 23],
-  'underline' : [4, 24],
-  'inverse' : [7, 27],
-  'white' : [37, 39],
-  'grey' : [90, 39],
-  'black' : [30, 39],
-  'blue' : [34, 39],
-  'cyan' : [36, 39],
-  'green' : [32, 39],
-  'magenta' : [35, 39],
-  'red' : [31, 39],
-  'yellow' : [33, 39]
-};
+/*
+ * Expects r and s to be positive DER integers.
+ *
+ * The DER format uses the most significant bit as a sign bit (& 0x80).
+ * If the significant bit is set AND the integer is positive, a 0x00 is prepended.
+ *
+ * Examples:
+ *
+ *      0 =>     0x00
+ *      1 =>     0x01
+ *     -1 =>     0xff
+ *    127 =>     0x7f
+ *   -127 =>     0x81
+ *    128 =>   0x0080
+ *   -128 =>     0x80
+ *    255 =>   0x00ff
+ *   -255 =>   0xff01
+ *  16300 =>   0x3fac
+ * -16300 =>   0xc054
+ *  62300 => 0x00f35c
+ * -62300 => 0xff0ca4
+*/
+function encode (r, s) {
+  var lenR = r.length
+  var lenS = s.length
+  if (lenR === 0) throw new Error('R length is zero')
+  if (lenS === 0) throw new Error('S length is zero')
+  if (lenR > 33) throw new Error('R length is too long')
+  if (lenS > 33) throw new Error('S length is too long')
+  if (r[0] & 0x80) throw new Error('R value is negative')
+  if (s[0] & 0x80) throw new Error('S value is negative')
+  if (lenR > 1 && (r[0] === 0x00) && !(r[1] & 0x80)) throw new Error('R value excessively padded')
+  if (lenS > 1 && (s[0] === 0x00) && !(s[1] & 0x80)) throw new Error('S value excessively padded')
 
-// Don't use 'blue' not visible on cmd.exe
-inspect.styles = {
-  'special': 'cyan',
-  'number': 'yellow',
-  'boolean': 'yellow',
-  'undefined': 'grey',
-  'null': 'bold',
-  'string': 'green',
-  'date': 'magenta',
-  // "name": intentionally not styling
-  'regexp': 'red'
-};
+  var signature = Buffer.allocUnsafe(6 + lenR + lenS)
 
+  // 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
+  signature[0] = 0x30
+  signature[1] = signature.length - 2
+  signature[2] = 0x02
+  signature[3] = r.length
+  r.copy(signature, 4)
+  signature[4 + lenR] = 0x02
+  signature[5 + lenR] = s.length
+  s.copy(signature, 6 + lenR)
 
-function stylizeWithColor(str, styleType) {
-  var style = inspect.styles[styleType];
+  return signature
+}
 
-  if (style) {
-    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-           '\u001b[' + inspect.colors[style][1] + 'm';
-  } else {
-    return str;
-  }
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
 }
 
+},{"safe-buffer":98}],40:[function(require,module,exports){
+module.exports={
+  "OP_FALSE": 0,
+  "OP_0": 0,
+  "OP_PUSHDATA1": 76,
+  "OP_PUSHDATA2": 77,
+  "OP_PUSHDATA4": 78,
+  "OP_1NEGATE": 79,
+  "OP_RESERVED": 80,
+  "OP_1": 81,
+  "OP_TRUE": 81,
+  "OP_2": 82,
+  "OP_3": 83,
+  "OP_4": 84,
+  "OP_5": 85,
+  "OP_6": 86,
+  "OP_7": 87,
+  "OP_8": 88,
+  "OP_9": 89,
+  "OP_10": 90,
+  "OP_11": 91,
+  "OP_12": 92,
+  "OP_13": 93,
+  "OP_14": 94,
+  "OP_15": 95,
+  "OP_16": 96,
+
+  "OP_NOP": 97,
+  "OP_VER": 98,
+  "OP_IF": 99,
+  "OP_NOTIF": 100,
+  "OP_VERIF": 101,
+  "OP_VERNOTIF": 102,
+  "OP_ELSE": 103,
+  "OP_ENDIF": 104,
+  "OP_VERIFY": 105,
+  "OP_RETURN": 106,
+
+  "OP_TOALTSTACK": 107,
+  "OP_FROMALTSTACK": 108,
+  "OP_2DROP": 109,
+  "OP_2DUP": 110,
+  "OP_3DUP": 111,
+  "OP_2OVER": 112,
+  "OP_2ROT": 113,
+  "OP_2SWAP": 114,
+  "OP_IFDUP": 115,
+  "OP_DEPTH": 116,
+  "OP_DROP": 117,
+  "OP_DUP": 118,
+  "OP_NIP": 119,
+  "OP_OVER": 120,
+  "OP_PICK": 121,
+  "OP_ROLL": 122,
+  "OP_ROT": 123,
+  "OP_SWAP": 124,
+  "OP_TUCK": 125,
+
+  "OP_CAT": 126,
+  "OP_SUBSTR": 127,
+  "OP_LEFT": 128,
+  "OP_RIGHT": 129,
+  "OP_SIZE": 130,
+
+  "OP_INVERT": 131,
+  "OP_AND": 132,
+  "OP_OR": 133,
+  "OP_XOR": 134,
+  "OP_EQUAL": 135,
+  "OP_EQUALVERIFY": 136,
+  "OP_RESERVED1": 137,
+  "OP_RESERVED2": 138,
+
+  "OP_1ADD": 139,
+  "OP_1SUB": 140,
+  "OP_2MUL": 141,
+  "OP_2DIV": 142,
+  "OP_NEGATE": 143,
+  "OP_ABS": 144,
+  "OP_NOT": 145,
+  "OP_0NOTEQUAL": 146,
+  "OP_ADD": 147,
+  "OP_SUB": 148,
+  "OP_MUL": 149,
+  "OP_DIV": 150,
+  "OP_MOD": 151,
+  "OP_LSHIFT": 152,
+  "OP_RSHIFT": 153,
+
+  "OP_BOOLAND": 154,
+  "OP_BOOLOR": 155,
+  "OP_NUMEQUAL": 156,
+  "OP_NUMEQUALVERIFY": 157,
+  "OP_NUMNOTEQUAL": 158,
+  "OP_LESSTHAN": 159,
+  "OP_GREATERTHAN": 160,
+  "OP_LESSTHANOREQUAL": 161,
+  "OP_GREATERTHANOREQUAL": 162,
+  "OP_MIN": 163,
+  "OP_MAX": 164,
+
+  "OP_WITHIN": 165,
+
+  "OP_RIPEMD160": 166,
+  "OP_SHA1": 167,
+  "OP_SHA256": 168,
+  "OP_HASH160": 169,
+  "OP_HASH256": 170,
+  "OP_CODESEPARATOR": 171,
+  "OP_CHECKSIG": 172,
+  "OP_CHECKSIGVERIFY": 173,
+  "OP_CHECKMULTISIG": 174,
+  "OP_CHECKMULTISIGVERIFY": 175,
+
+  "OP_NOP1": 176,
+  "OP_NOP2": 177,
+  "OP_CHECKLOCKTIMEVERIFY": 177,
+
+  "OP_NOP3": 178,
+  "OP_NOP4": 179,
+  "OP_NOP5": 180,
+  "OP_NOP6": 181,
+  "OP_NOP7": 182,
+  "OP_NOP8": 183,
+  "OP_NOP9": 184,
+  "OP_NOP10": 185,
+
+  "OP_PUBKEYHASH": 253,
+  "OP_PUBKEY": 254,
+  "OP_INVALIDOPCODE": 255
+}
+
+},{}],41:[function(require,module,exports){
+var OPS = require('./index.json')
+
+var map = {}
+for (var op in OPS) {
+  var code = OPS[op]
+  map[code] = op
+}
+
+module.exports = map
+
+},{"./index.json":40}],42:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var bs58check = require('bs58check')
+var bscript = require('./script')
+var networks = require('./networks')
+var typeforce = require('typeforce')
+var types = require('./types')
+
+function fromBase58Check (address) {
+  var payload = bs58check.decode(address)
+  if (payload.length < 21) throw new TypeError(address + ' is too short')
+  if (payload.length > 21) throw new TypeError(address + ' is too long')
 
-function stylizeNoColor(str, styleType) {
-  return str;
+  var version = payload.readUInt8(0)
+  var hash = payload.slice(1)
+
+  return { hash: hash, version: version }
 }
 
+function toBase58Check (hash, version) {
+  typeforce(types.tuple(types.Hash160bit, types.UInt8), arguments)
 
-function arrayToHash(array) {
-  var hash = {};
+  var payload = Buffer.allocUnsafe(21)
+  payload.writeUInt8(version, 0)
+  hash.copy(payload, 1)
 
-  array.forEach(function(val, idx) {
-    hash[val] = true;
-  });
+  return bs58check.encode(payload)
+}
 
-  return hash;
+function fromOutputScript (outputScript, network) {
+  network = network || networks.bitcoin
+
+  if (bscript.pubKeyHash.output.check(outputScript)) return toBase58Check(bscript.compile(outputScript).slice(3, 23), network.pubKeyHash)
+  if (bscript.scriptHash.output.check(outputScript)) return toBase58Check(bscript.compile(outputScript).slice(2, 22), network.scriptHash)
+
+  throw new Error(bscript.toASM(outputScript) + ' has no matching Address')
 }
 
+function toOutputScript (address, network) {
+  network = network || networks.bitcoin
 
-function formatValue(ctx, value, recurseTimes) {
-  // Provide a hook for user-specified inspect functions.
-  // Check that value is an object with an inspect function on it
-  if (ctx.customInspect &&
-      value &&
-      isFunction(value.inspect) &&
-      // Filter out the util module, it's inspect function is special
-      value.inspect !== exports.inspect &&
-      // Also filter out any prototype objects using the circular check.
-      !(value.constructor && value.constructor.prototype === value)) {
-    var ret = value.inspect(recurseTimes, ctx);
-    if (!isString(ret)) {
-      ret = formatValue(ctx, ret, recurseTimes);
-    }
-    return ret;
-  }
+  var decode = fromBase58Check(address)
+  if (decode.version === network.pubKeyHash) return bscript.pubKeyHash.output.encode(decode.hash)
+  if (decode.version === network.scriptHash) return bscript.scriptHash.output.encode(decode.hash)
 
-  // Primitive types cannot have properties
-  var primitive = formatPrimitive(ctx, value);
-  if (primitive) {
-    return primitive;
-  }
+  throw new Error(address + ' has no matching Script')
+}
 
-  // Look up the keys of the object.
-  var keys = Object.keys(value);
-  var visibleKeys = arrayToHash(keys);
+module.exports = {
+  fromBase58Check: fromBase58Check,
+  fromOutputScript: fromOutputScript,
+  toBase58Check: toBase58Check,
+  toOutputScript: toOutputScript
+}
 
-  if (ctx.showHidden) {
-    keys = Object.getOwnPropertyNames(value);
-  }
+},{"./networks":51,"./script":52,"./types":78,"bs58check":80,"safe-buffer":98,"typeforce":109}],43:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var bcrypto = require('./crypto')
+var fastMerkleRoot = require('merkle-lib/fastRoot')
+var typeforce = require('typeforce')
+var types = require('./types')
+var varuint = require('varuint-bitcoin')
 
-  // IE doesn't make error fields non-enumerable
-  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-  if (isError(value)
-      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-    return formatError(value);
-  }
+var Transaction = require('./transaction')
 
-  // Some type of object without properties can be shortcutted.
-  if (keys.length === 0) {
-    if (isFunction(value)) {
-      var name = value.name ? ': ' + value.name : '';
-      return ctx.stylize('[Function' + name + ']', 'special');
-    }
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    }
-    if (isDate(value)) {
-      return ctx.stylize(Date.prototype.toString.call(value), 'date');
-    }
-    if (isError(value)) {
-      return formatError(value);
-    }
-  }
+function Block () {
+  this.version = 1
+  this.prevHash = null
+  this.merkleRoot = null
+  this.timestamp = 0
+  this.bits = 0
+  this.nonce = 0
+}
 
-  var base = '', array = false, braces = ['{', '}'];
+Block.fromBuffer = function (buffer) {
+  if (buffer.length < 80) throw new Error('Buffer too small (< 80 bytes)')
 
-  // Make Array say that they are Array
-  if (isArray(value)) {
-    array = true;
-    braces = ['[', ']'];
+  var offset = 0
+  function readSlice (n) {
+    offset += n
+    return buffer.slice(offset - n, offset)
   }
 
-  // Make functions say that they are functions
-  if (isFunction(value)) {
-    var n = value.name ? ': ' + value.name : '';
-    base = ' [Function' + n + ']';
+  function readUInt32 () {
+    var i = buffer.readUInt32LE(offset)
+    offset += 4
+    return i
   }
 
-  // Make RegExps say that they are RegExps
-  if (isRegExp(value)) {
-    base = ' ' + RegExp.prototype.toString.call(value);
+  function readInt32 () {
+    var i = buffer.readInt32LE(offset)
+    offset += 4
+    return i
   }
 
-  // Make dates with properties first say the date
-  if (isDate(value)) {
-    base = ' ' + Date.prototype.toUTCString.call(value);
-  }
+  var block = new Block()
+  block.version = readInt32()
+  block.prevHash = readSlice(32)
+  block.merkleRoot = readSlice(32)
+  block.timestamp = readUInt32()
+  block.bits = readUInt32()
+  block.nonce = readUInt32()
 
-  // Make error with message first say the error
-  if (isError(value)) {
-    base = ' ' + formatError(value);
-  }
+  if (buffer.length === 80) return block
 
-  if (keys.length === 0 && (!array || value.length == 0)) {
-    return braces[0] + base + braces[1];
+  function readVarInt () {
+    var vi = varuint.decode(buffer, offset)
+    offset += varuint.decode.bytes
+    return vi
   }
 
-  if (recurseTimes < 0) {
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    } else {
-      return ctx.stylize('[Object]', 'special');
-    }
+  function readTransaction () {
+    var tx = Transaction.fromBuffer(buffer.slice(offset), true)
+    offset += tx.byteLength()
+    return tx
   }
 
-  ctx.seen.push(value);
+  var nTransactions = readVarInt()
+  block.transactions = []
 
-  var output;
-  if (array) {
-    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-  } else {
-    output = keys.map(function(key) {
-      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-    });
+  for (var i = 0; i < nTransactions; ++i) {
+    var tx = readTransaction()
+    block.transactions.push(tx)
   }
 
-  ctx.seen.pop();
-
-  return reduceToSingleString(output, base, braces);
+  return block
 }
 
+Block.prototype.byteLength = function (headersOnly) {
+  if (headersOnly || !this.transactions) return 80
 
-function formatPrimitive(ctx, value) {
-  if (isUndefined(value))
-    return ctx.stylize('undefined', 'undefined');
-  if (isString(value)) {
-    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-                                             .replace(/'/g, "\\'")
-                                             .replace(/\\"/g, '"') + '\'';
-    return ctx.stylize(simple, 'string');
-  }
-  if (isNumber(value))
-    return ctx.stylize('' + value, 'number');
-  if (isBoolean(value))
-    return ctx.stylize('' + value, 'boolean');
-  // For some reason typeof null is "object", so special case here.
-  if (isNull(value))
-    return ctx.stylize('null', 'null');
+  return 80 + varuint.encodingLength(this.transactions.length) + this.transactions.reduce(function (a, x) {
+    return a + x.byteLength()
+  }, 0)
 }
 
+Block.fromHex = function (hex) {
+  return Block.fromBuffer(Buffer.from(hex, 'hex'))
+}
 
-function formatError(value) {
-  return '[' + Error.prototype.toString.call(value) + ']';
+Block.prototype.getHash = function () {
+  return bcrypto.hash256(this.toBuffer(true))
 }
 
+Block.prototype.getId = function () {
+  return this.getHash().reverse().toString('hex')
+}
 
-function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-  var output = [];
-  for (var i = 0, l = value.length; i < l; ++i) {
-    if (hasOwnProperty(value, String(i))) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          String(i), true));
-    } else {
-      output.push('');
-    }
-  }
-  keys.forEach(function(key) {
-    if (!key.match(/^\d+$/)) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          key, true));
-    }
-  });
-  return output;
+Block.prototype.getUTCDate = function () {
+  var date = new Date(0) // epoch
+  date.setUTCSeconds(this.timestamp)
+
+  return date
 }
 
+// TODO: buffer, offset compatibility
+Block.prototype.toBuffer = function (headersOnly) {
+  var buffer = Buffer.allocUnsafe(this.byteLength(headersOnly))
 
-function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-  var name, str, desc;
-  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-  if (desc.get) {
-    if (desc.set) {
-      str = ctx.stylize('[Getter/Setter]', 'special');
-    } else {
-      str = ctx.stylize('[Getter]', 'special');
-    }
-  } else {
-    if (desc.set) {
-      str = ctx.stylize('[Setter]', 'special');
-    }
-  }
-  if (!hasOwnProperty(visibleKeys, key)) {
-    name = '[' + key + ']';
+  var offset = 0
+  function writeSlice (slice) {
+    slice.copy(buffer, offset)
+    offset += slice.length
   }
-  if (!str) {
-    if (ctx.seen.indexOf(desc.value) < 0) {
-      if (isNull(recurseTimes)) {
-        str = formatValue(ctx, desc.value, null);
-      } else {
-        str = formatValue(ctx, desc.value, recurseTimes - 1);
-      }
-      if (str.indexOf('\n') > -1) {
-        if (array) {
-          str = str.split('\n').map(function(line) {
-            return '  ' + line;
-          }).join('\n').substr(2);
-        } else {
-          str = '\n' + str.split('\n').map(function(line) {
-            return '   ' + line;
-          }).join('\n');
-        }
-      }
-    } else {
-      str = ctx.stylize('[Circular]', 'special');
-    }
+
+  function writeInt32 (i) {
+    buffer.writeInt32LE(i, offset)
+    offset += 4
   }
-  if (isUndefined(name)) {
-    if (array && key.match(/^\d+$/)) {
-      return str;
-    }
-    name = JSON.stringify('' + key);
-    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-      name = name.substr(1, name.length - 2);
-      name = ctx.stylize(name, 'name');
-    } else {
-      name = name.replace(/'/g, "\\'")
-                 .replace(/\\"/g, '"')
-                 .replace(/(^"|"$)/g, "'");
-      name = ctx.stylize(name, 'string');
-    }
+  function writeUInt32 (i) {
+    buffer.writeUInt32LE(i, offset)
+    offset += 4
   }
 
-  return name + ': ' + str;
-}
+  writeInt32(this.version)
+  writeSlice(this.prevHash)
+  writeSlice(this.merkleRoot)
+  writeUInt32(this.timestamp)
+  writeUInt32(this.bits)
+  writeUInt32(this.nonce)
 
+  if (headersOnly || !this.transactions) return buffer
 
-function reduceToSingleString(output, base, braces) {
-  var numLinesEst = 0;
-  var length = output.reduce(function(prev, cur) {
-    numLinesEst++;
-    if (cur.indexOf('\n') >= 0) numLinesEst++;
-    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-  }, 0);
+  varuint.encode(this.transactions.length, buffer, offset)
+  offset += varuint.encode.bytes
 
-  if (length > 60) {
-    return braces[0] +
-           (base === '' ? '' : base + '\n ') +
-           ' ' +
-           output.join(',\n  ') +
-           ' ' +
-           braces[1];
-  }
+  this.transactions.forEach(function (tx) {
+    var txSize = tx.byteLength() // TODO: extract from toBuffer?
+    tx.toBuffer(buffer, offset)
+    offset += txSize
+  })
 
-  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+  return buffer
 }
 
+Block.prototype.toHex = function (headersOnly) {
+  return this.toBuffer(headersOnly).toString('hex')
+}
 
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-function isArray(ar) {
-  return Array.isArray(ar);
+Block.calculateTarget = function (bits) {
+  var exponent = ((bits & 0xff000000) >> 24) - 3
+  var mantissa = bits & 0x007fffff
+  var target = Buffer.alloc(32, 0)
+  target.writeUInt32BE(mantissa, 28 - exponent)
+  return target
 }
-exports.isArray = isArray;
 
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
+Block.calculateMerkleRoot = function (transactions) {
+  typeforce([{ getHash: types.Function }], transactions)
+  if (transactions.length === 0) throw TypeError('Cannot compute merkle root for zero transactions')
+
+  var hashes = transactions.map(function (transaction) {
+    return transaction.getHash()
+  })
+
+  return fastMerkleRoot(hashes, bcrypto.hash256)
 }
-exports.isBoolean = isBoolean;
 
-function isNull(arg) {
-  return arg === null;
+Block.prototype.checkMerkleRoot = function () {
+  if (!this.transactions) return false
+
+  var actualMerkleRoot = Block.calculateMerkleRoot(this.transactions)
+  return this.merkleRoot.compare(actualMerkleRoot) === 0
 }
-exports.isNull = isNull;
 
-function isNullOrUndefined(arg) {
-  return arg == null;
+Block.prototype.checkProofOfWork = function () {
+  var hash = this.getHash().reverse()
+  var target = Block.calculateTarget(this.bits)
+
+  return hash.compare(target) <= 0
 }
-exports.isNullOrUndefined = isNullOrUndefined;
 
-function isNumber(arg) {
-  return typeof arg === 'number';
+module.exports = Block
+
+},{"./crypto":45,"./transaction":76,"./types":78,"merkle-lib/fastRoot":94,"safe-buffer":98,"typeforce":109,"varuint-bitcoin":111}],44:[function(require,module,exports){
+var pushdata = require('pushdata-bitcoin')
+var varuint = require('varuint-bitcoin')
+
+// https://github.com/feross/buffer/blob/master/index.js#L1127
+function verifuint (value, max) {
+  if (typeof value !== 'number') throw new Error('cannot write a non-number as a number')
+  if (value < 0) throw new Error('specified a negative value for writing an unsigned value')
+  if (value > max) throw new Error('RangeError: value out of range')
+  if (Math.floor(value) !== value) throw new Error('value has a fractional component')
 }
-exports.isNumber = isNumber;
 
-function isString(arg) {
-  return typeof arg === 'string';
+function readUInt64LE (buffer, offset) {
+  var a = buffer.readUInt32LE(offset)
+  var b = buffer.readUInt32LE(offset + 4)
+  b *= 0x100000000
+
+  verifuint(b + a, 0x001fffffffffffff)
+
+  return b + a
 }
-exports.isString = isString;
 
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
+function writeUInt64LE (buffer, value, offset) {
+  verifuint(value, 0x001fffffffffffff)
+
+  buffer.writeInt32LE(value & -1, offset)
+  buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4)
+  return offset + 8
 }
-exports.isSymbol = isSymbol;
 
-function isUndefined(arg) {
-  return arg === void 0;
+// TODO: remove in 4.0.0?
+function readVarInt (buffer, offset) {
+  var result = varuint.decode(buffer, offset)
+
+  return {
+    number: result,
+    size: varuint.decode.bytes
+  }
 }
-exports.isUndefined = isUndefined;
 
-function isRegExp(re) {
-  return isObject(re) && objectToString(re) === '[object RegExp]';
+// TODO: remove in 4.0.0?
+function writeVarInt (buffer, number, offset) {
+  varuint.encode(number, buffer, offset)
+  return varuint.encode.bytes
 }
-exports.isRegExp = isRegExp;
 
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
+module.exports = {
+  pushDataSize: pushdata.encodingLength,
+  readPushDataInt: pushdata.decode,
+  readUInt64LE: readUInt64LE,
+  readVarInt: readVarInt,
+  varIntBuffer: varuint.encode,
+  varIntSize: varuint.encodingLength,
+  writePushDataInt: pushdata.encode,
+  writeUInt64LE: writeUInt64LE,
+  writeVarInt: writeVarInt
 }
-exports.isObject = isObject;
 
-function isDate(d) {
-  return isObject(d) && objectToString(d) === '[object Date]';
+},{"pushdata-bitcoin":95,"varuint-bitcoin":111}],45:[function(require,module,exports){
+var createHash = require('create-hash')
+
+function ripemd160 (buffer) {
+  return createHash('rmd160').update(buffer).digest()
 }
-exports.isDate = isDate;
 
-function isError(e) {
-  return isObject(e) &&
-      (objectToString(e) === '[object Error]' || e instanceof Error);
+function sha1 (buffer) {
+  return createHash('sha1').update(buffer).digest()
 }
-exports.isError = isError;
 
-function isFunction(arg) {
-  return typeof arg === 'function';
+function sha256 (buffer) {
+  return createHash('sha256').update(buffer).digest()
 }
-exports.isFunction = isFunction;
 
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
+function hash160 (buffer) {
+  return ripemd160(sha256(buffer))
 }
-exports.isPrimitive = isPrimitive;
 
-exports.isBuffer = require('./support/isBuffer');
+function hash256 (buffer) {
+  return sha256(sha256(buffer))
+}
 
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
+module.exports = {
+  hash160: hash160,
+  hash256: hash256,
+  ripemd160: ripemd160,
+  sha1: sha1,
+  sha256: sha256
 }
 
+},{"create-hash":82}],46:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var createHmac = require('create-hmac')
+var typeforce = require('typeforce')
+var types = require('./types')
 
-function pad(n) {
-  return n < 10 ? '0' + n.toString(10) : n.toString(10);
-}
+var BigInteger = require('bigi')
+var ECSignature = require('./ecsignature')
 
+var ZERO = Buffer.alloc(1, 0)
+var ONE = Buffer.alloc(1, 1)
 
-var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
-              'Oct', 'Nov', 'Dec'];
+var ecurve = require('ecurve')
+var secp256k1 = ecurve.getCurveByName('secp256k1')
 
-// 26 Feb 16:19:34
-function timestamp() {
-  var d = new Date();
-  var time = [pad(d.getHours()),
-              pad(d.getMinutes()),
-              pad(d.getSeconds())].join(':');
-  return [d.getDate(), months[d.getMonth()], time].join(' ');
-}
+// https://tools.ietf.org/html/rfc6979#section-3.2
+function deterministicGenerateK (hash, x, checkSig) {
+  typeforce(types.tuple(
+    types.Hash256bit,
+    types.Buffer256bit,
+    types.Function
+  ), arguments)
 
+  // Step A, ignored as hash already provided
+  // Step B
+  // Step C
+  var k = Buffer.alloc(32, 0)
+  var v = Buffer.alloc(32, 1)
 
-// log is just a thin wrapper to console.log that prepends a timestamp
-exports.log = function() {
-  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
-};
+  // Step D
+  k = createHmac('sha256', k)
+    .update(v)
+    .update(ZERO)
+    .update(x)
+    .update(hash)
+    .digest()
 
+  // Step E
+  v = createHmac('sha256', k).update(v).digest()
 
-/**
- * Inherit the prototype methods from one constructor into another.
- *
- * The Function.prototype.inherits from lang.js rewritten as a standalone
- * function (not on Function.prototype). NOTE: If this file is to be loaded
- * during bootstrapping this function needs to be rewritten using some native
- * functions as prototype setup using normal JavaScript does not work as
- * expected during bootstrapping (see mirror.js in r114903).
- *
- * @param {function} ctor Constructor function which needs to inherit the
- *     prototype.
- * @param {function} superCtor Constructor function to inherit prototype from.
- */
-exports.inherits = require('inherits');
+  // Step F
+  k = createHmac('sha256', k)
+    .update(v)
+    .update(ONE)
+    .update(x)
+    .update(hash)
+    .digest()
 
-exports._extend = function(origin, add) {
-  // Don't do anything if add isn't an object
-  if (!add || !isObject(add)) return origin;
+  // Step G
+  v = createHmac('sha256', k).update(v).digest()
 
-  var keys = Object.keys(add);
-  var i = keys.length;
-  while (i--) {
-    origin[keys[i]] = add[keys[i]];
-  }
-  return origin;
-};
+  // Step H1/H2a, ignored as tlen === qlen (256 bit)
+  // Step H2b
+  v = createHmac('sha256', k).update(v).digest()
 
-function hasOwnProperty(obj, prop) {
-  return Object.prototype.hasOwnProperty.call(obj, prop);
-}
+  var T = BigInteger.fromBuffer(v)
 
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"./support/isBuffer":28,"_process":14,"inherits":12}],30:[function(require,module,exports){
-// Base58 encoding/decoding
-// Originally written by Mike Hearn for BitcoinJ
-// Copyright (c) 2011 Google Inc
-// Ported to JavaScript by Stefan Thomas
-// Merged Buffer refactorings from base58-native by Stephen Pair
-// Copyright (c) 2013 BitPay Inc
+  // Step H3, repeat until T is within the interval [1, n - 1] and is suitable for ECDSA
+  while (T.signum() <= 0 || T.compareTo(secp256k1.n) >= 0 || !checkSig(T)) {
+    k = createHmac('sha256', k)
+      .update(v)
+      .update(ZERO)
+      .digest()
 
-var ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
-var ALPHABET_MAP = {}
-for(var i = 0; i < ALPHABET.length; i++) {
-  ALPHABET_MAP[ALPHABET.charAt(i)] = i
+    v = createHmac('sha256', k).update(v).digest()
+
+    // Step H1/H2a, again, ignored as tlen === qlen (256 bit)
+    // Step H2b again
+    v = createHmac('sha256', k).update(v).digest()
+    T = BigInteger.fromBuffer(v)
+  }
+
+  return T
 }
-var BASE = 58
 
-function encode(buffer) {
-  if (buffer.length === 0) return ''
+var N_OVER_TWO = secp256k1.n.shiftRight(1)
 
-  var i, j, digits = [0]
-  for (i = 0; i < buffer.length; i++) {
-    for (j = 0; j < digits.length; j++) digits[j] <<= 8
+function sign (hash, d) {
+  typeforce(types.tuple(types.Hash256bit, types.BigInt), arguments)
 
-    digits[0] += buffer[i]
+  var x = d.toBuffer(32)
+  var e = BigInteger.fromBuffer(hash)
+  var n = secp256k1.n
+  var G = secp256k1.G
 
-    var carry = 0
-    for (j = 0; j < digits.length; ++j) {
-      digits[j] += carry
+  var r, s
+  deterministicGenerateK(hash, x, function (k) {
+    var Q = G.multiply(k)
 
-      carry = (digits[j] / BASE) | 0
-      digits[j] %= BASE
-    }
+    if (secp256k1.isInfinity(Q)) return false
 
-    while (carry) {
-      digits.push(carry % BASE)
+    r = Q.affineX.mod(n)
+    if (r.signum() === 0) return false
 
-      carry = (carry / BASE) | 0
-    }
-  }
+    s = k.modInverse(n).multiply(e.add(d.multiply(r))).mod(n)
+    if (s.signum() === 0) return false
 
-  // deal with leading zeros
-  for (i = 0; buffer[i] === 0 && i < buffer.length - 1; i++) digits.push(0)
+    return true
+  })
 
-  // convert digits to a string
-  var stringOutput = ""
-  for (var i = digits.length - 1; i >= 0; i--) {
-    stringOutput = stringOutput + ALPHABET[digits[i]]
+  // enforce low S values, see bip62: 'low s values in signatures'
+  if (s.compareTo(N_OVER_TWO) > 0) {
+    s = n.subtract(s)
   }
-  return stringOutput
-}
 
-function decode(string) {
-  if (string.length === 0) return []
+  return new ECSignature(r, s)
+}
 
-  var i, j, bytes = [0]
-  for (i = 0; i < string.length; i++) {
-    var c = string[i]
-    if (!(c in ALPHABET_MAP)) throw new Error('Non-base58 character')
+function verify (hash, signature, Q) {
+  typeforce(types.tuple(
+    types.Hash256bit,
+    types.ECSignature,
+    types.ECPoint
+  ), arguments)
 
-    for (j = 0; j < bytes.length; j++) bytes[j] *= BASE
-    bytes[0] += ALPHABET_MAP[c]
+  var n = secp256k1.n
+  var G = secp256k1.G
 
-    var carry = 0
-    for (j = 0; j < bytes.length; ++j) {
-      bytes[j] += carry
+  var r = signature.r
+  var s = signature.s
 
-      carry = bytes[j] >> 8
-      bytes[j] &= 0xff
-    }
+  // 1.4.1 Enforce r and s are both integers in the interval [1, n − 1]
+  if (r.signum() <= 0 || r.compareTo(n) >= 0) return false
+  if (s.signum() <= 0 || s.compareTo(n) >= 0) return false
 
-    while (carry) {
-      bytes.push(carry & 0xff)
+  // 1.4.2 H = Hash(M), already done by the user
+  // 1.4.3 e = H
+  var e = BigInteger.fromBuffer(hash)
 
-      carry >>= 8
-    }
-  }
+  // Compute s^-1
+  var sInv = s.modInverse(n)
 
-  // deal with leading zeros
-  for (i = 0; string[i] === '1' && i < string.length - 1; i++) bytes.push(0)
+  // 1.4.4 Compute u1 = es^−1 mod n
+  //               u2 = rs^−1 mod n
+  var u1 = e.multiply(sInv).mod(n)
+  var u2 = r.multiply(sInv).mod(n)
 
-  return bytes.reverse()
-}
+  // 1.4.5 Compute R = (xR, yR)
+  //               R = u1G + u2Q
+  var R = G.multiplyTwo(u1, Q, u2)
 
-module.exports = {
-  encode: encode,
-  decode: decode
-}
+  // 1.4.5 (cont.) Enforce R is not at infinity
+  if (secp256k1.isInfinity(R)) return false
 
-},{}],31:[function(require,module,exports){
-(function (Buffer){
-'use strict'
+  // 1.4.6 Convert the field element R.x to an integer
+  var xR = R.affineX
 
-var base58 = require('bs58')
-var createHash = require('create-hash')
+  // 1.4.7 Set v = xR mod n
+  var v = xR.mod(n)
 
-// SHA256(SHA256(buffer))
-function sha256x2 (buffer) {
-  buffer = createHash('sha256').update(buffer).digest()
-  return createHash('sha256').update(buffer).digest()
+  // 1.4.8 If v = r, output "valid", and if v != r, output "invalid"
+  return v.equals(r)
 }
 
-// Encode a buffer as a base58-check encoded string
-function encode (payload) {
-  var checksum = sha256x2(payload).slice(0, 4)
+module.exports = {
+  deterministicGenerateK: deterministicGenerateK,
+  sign: sign,
+  verify: verify,
 
-  return base58.encode(Buffer.concat([
-    payload,
-    checksum
-  ]))
+  // TODO: remove
+  __curve: secp256k1
 }
 
-// Decode a base58-check encoded string to a buffer
-function decode (string) {
-  var buffer = new Buffer(base58.decode(string))
+},{"./ecsignature":48,"./types":78,"bigi":37,"create-hmac":85,"ecurve":89,"safe-buffer":98,"typeforce":109}],47:[function(require,module,exports){
+var baddress = require('./address')
+var bcrypto = require('./crypto')
+var ecdsa = require('./ecdsa')
+var randomBytes = require('randombytes')
+var typeforce = require('typeforce')
+var types = require('./types')
+var wif = require('wif')
 
-  var payload = buffer.slice(0, -4)
-  var checksum = buffer.slice(-4)
-  var newChecksum = sha256x2(payload).slice(0, 4)
+var NETWORKS = require('./networks')
+var BigInteger = require('bigi')
 
-  for (var i = 0; i < newChecksum.length; ++i) {
-    if (newChecksum[i] === checksum[i]) continue
+var ecurve = require('ecurve')
+var secp256k1 = ecdsa.__curve
 
-    throw new Error('Invalid checksum')
+function ECPair (d, Q, options) {
+  if (options) {
+    typeforce({
+      compressed: types.maybe(types.Boolean),
+      network: types.maybe(types.Network)
+    }, options)
   }
 
-  return payload
-}
+  options = options || {}
 
-module.exports = {
-  encode: encode,
-  decode: decode
+  if (d) {
+    if (d.signum() <= 0) throw new Error('Private key must be greater than 0')
+    if (d.compareTo(secp256k1.n) >= 0) throw new Error('Private key must be less than the curve order')
+    if (Q) throw new TypeError('Unexpected publicKey parameter')
+
+    this.d = d
+  } else {
+    typeforce(types.ECPoint, Q)
+
+    this.__Q = Q
+  }
+
+  this.compressed = options.compressed === undefined ? true : options.compressed
+  this.network = options.network || NETWORKS.bitcoin
 }
 
-}).call(this,require("buffer").Buffer)
-},{"bs58":30,"buffer":7,"create-hash":32}],32:[function(require,module,exports){
-(function (Buffer){
-'use strict';
-var inherits = require('inherits')
-var md5 = require('./md5')
-var rmd160 = require('ripemd160')
-var sha = require('sha.js')
+Object.defineProperty(ECPair.prototype, 'Q', {
+  get: function () {
+    if (!this.__Q && this.d) {
+      this.__Q = secp256k1.G.multiply(this.d)
+    }
 
-var Transform = require('stream').Transform
+    return this.__Q
+  }
+})
 
-function HashNoConstructor(hash) {
-  Transform.call(this)
+ECPair.fromPublicKeyBuffer = function (buffer, network) {
+  var Q = ecurve.Point.decodeFrom(secp256k1, buffer)
 
-  this._hash = hash
-  this.buffers = []
+  return new ECPair(null, Q, {
+    compressed: Q.compressed,
+    network: network
+  })
 }
 
-inherits(HashNoConstructor, Transform)
+ECPair.fromWIF = function (string, network) {
+  var decoded = wif.decode(string)
+  var version = decoded.version
 
-HashNoConstructor.prototype._transform = function (data, _, next) {
-  this.buffers.push(data)
+  // list of networks?
+  if (types.Array(network)) {
+    network = network.filter(function (x) {
+      return version === x.wif
+    }).pop()
 
-  next()
-}
+    if (!network) throw new Error('Unknown network version')
 
-HashNoConstructor.prototype._flush = function (next) {
-  this.push(this.digest())
-  next()
-}
+  // otherwise, assume a network object (or default to bitcoin)
+  } else {
+    network = network || NETWORKS.bitcoin
 
-HashNoConstructor.prototype.update = function (data, enc) {
-  if (typeof data === 'string') {
-    data = new Buffer(data, enc)
+    if (version !== network.wif) throw new Error('Invalid network version')
   }
 
-  this.buffers.push(data)
-  return this
-}
-
-HashNoConstructor.prototype.digest = function (enc) {
-  var buf = Buffer.concat(this.buffers)
-  var r = this._hash(buf)
-  this.buffers = null
+  var d = BigInteger.fromBuffer(decoded.privateKey)
 
-  return enc ? r.toString(enc) : r
+  return new ECPair(d, null, {
+    compressed: decoded.compressed,
+    network: network
+  })
 }
 
-function Hash(hash) {
-  Transform.call(this)
+ECPair.makeRandom = function (options) {
+  options = options || {}
 
-  this._hash = hash
-}
+  var rng = options.rng || randomBytes
 
-inherits(Hash, Transform)
+  var d
+  do {
+    var buffer = rng(32)
+    typeforce(types.Buffer256bit, buffer)
 
-Hash.prototype._transform = function (data, enc, next) {
-  if (enc) data = new Buffer(data, enc)
+    d = BigInteger.fromBuffer(buffer)
+  } while (d.signum() <= 0 || d.compareTo(secp256k1.n) >= 0)
 
-  this._hash.update(data)
+  return new ECPair(d, null, options)
+}
 
-  next()
+ECPair.prototype.getAddress = function () {
+  return baddress.toBase58Check(bcrypto.hash160(this.getPublicKeyBuffer()), this.getNetwork().pubKeyHash)
 }
 
-Hash.prototype._flush = function (next) {
-  this.push(this._hash.digest())
-  this._hash = null
+ECPair.prototype.getNetwork = function () {
+  return this.network
+}
 
-  next()
+ECPair.prototype.getPublicKeyBuffer = function () {
+  return this.Q.getEncoded(this.compressed)
 }
 
-Hash.prototype.update = function (data, enc) {
-  if (typeof data === 'string') {
-    data = new Buffer(data, enc)
-  }
+ECPair.prototype.sign = function (hash) {
+  if (!this.d) throw new Error('Missing private key')
 
-  this._hash.update(data)
-  return this
+  return ecdsa.sign(hash, this.d)
 }
 
-Hash.prototype.digest = function (enc) {
-  var outData = this._hash.digest()
+ECPair.prototype.toWIF = function () {
+  if (!this.d) throw new Error('Missing private key')
 
-  return enc ? outData.toString(enc) : outData
+  return wif.encode(this.network.wif, this.d.toBuffer(32), this.compressed)
 }
 
-module.exports = function createHash (alg) {
-  if ('md5' === alg) return new HashNoConstructor(md5)
-  if ('rmd160' === alg) return new HashNoConstructor(rmd160)
-
-  return new Hash(sha(alg))
+ECPair.prototype.verify = function (hash, signature) {
+  return ecdsa.verify(hash, signature, this.Q)
 }
 
-}).call(this,require("buffer").Buffer)
-},{"./md5":34,"buffer":7,"inherits":35,"ripemd160":36,"sha.js":38,"stream":26}],33:[function(require,module,exports){
+module.exports = ECPair
+
+},{"./address":42,"./crypto":45,"./ecdsa":46,"./networks":51,"./types":78,"bigi":37,"ecurve":89,"randombytes":96,"typeforce":109,"wif":112}],48:[function(require,module,exports){
 (function (Buffer){
-'use strict';
-var intSize = 4;
-var zeroBuffer = new Buffer(intSize); zeroBuffer.fill(0);
-var chrsz = 8;
+var bip66 = require('bip66')
+var typeforce = require('typeforce')
+var types = require('./types')
 
-function toArray(buf, bigEndian) {
-  if ((buf.length % intSize) !== 0) {
-    var len = buf.length + (intSize - (buf.length % intSize));
-    buf = Buffer.concat([buf, zeroBuffer], len);
-  }
+var BigInteger = require('bigi')
 
-  var arr = [];
-  var fn = bigEndian ? buf.readInt32BE : buf.readInt32LE;
-  for (var i = 0; i < buf.length; i += intSize) {
-    arr.push(fn.call(buf, i));
-  }
-  return arr;
-}
+function ECSignature (r, s) {
+  typeforce(types.tuple(types.BigInt, types.BigInt), arguments)
 
-function toBuffer(arr, size, bigEndian) {
-  var buf = new Buffer(size);
-  var fn = bigEndian ? buf.writeInt32BE : buf.writeInt32LE;
-  for (var i = 0; i < arr.length; i++) {
-    fn.call(buf, arr[i], i * 4, true);
-  }
-  return buf;
+  this.r = r
+  this.s = s
 }
 
-function hash(buf, fn, hashSize, bigEndian) {
-  if (!Buffer.isBuffer(buf)) buf = new Buffer(buf);
-  var arr = fn(toArray(buf, bigEndian), buf.length * chrsz);
-  return toBuffer(arr, hashSize, bigEndian);
-}
-exports.hash = hash;
-}).call(this,require("buffer").Buffer)
-},{"buffer":7}],34:[function(require,module,exports){
-'use strict';
-/*
- * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
- * Digest Algorithm, as defined in RFC 1321.
- * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
- * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- * Distributed under the BSD License
- * See http://pajhome.org.uk/crypt/md5 for more info.
- */
+ECSignature.parseCompact = function (buffer) {
+  if (buffer.length !== 65) throw new Error('Invalid signature length')
 
-var helpers = require('./helpers');
+  var flagByte = buffer.readUInt8(0) - 27
+  if (flagByte !== (flagByte & 7)) throw new Error('Invalid signature parameter')
 
-/*
- * Calculate the MD5 of an array of little-endian words, and a bit length
- */
-function core_md5(x, len)
-{
-  /* append padding */
-  x[len >> 5] |= 0x80 << ((len) % 32);
-  x[(((len + 64) >>> 9) << 4) + 14] = len;
+  var compressed = !!(flagByte & 4)
+  var recoveryParam = flagByte & 3
 
-  var a =  1732584193;
-  var b = -271733879;
-  var c = -1732584194;
-  var d =  271733878;
+  var r = BigInteger.fromBuffer(buffer.slice(1, 33))
+  var s = BigInteger.fromBuffer(buffer.slice(33))
 
-  for(var i = 0; i < x.length; i += 16)
-  {
-    var olda = a;
-    var oldb = b;
-    var oldc = c;
-    var oldd = d;
+  return {
+    compressed: compressed,
+    i: recoveryParam,
+    signature: new ECSignature(r, s)
+  }
+}
 
-    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
-    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
-    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
-    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
-    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
-    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
-    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
-    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
-    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
-    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
-    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
-    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
-    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
-    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
-    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
-    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
+ECSignature.fromDER = function (buffer) {
+  var decode = bip66.decode(buffer)
+  var r = BigInteger.fromDERInteger(decode.r)
+  var s = BigInteger.fromDERInteger(decode.s)
 
-    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
-    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
-    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
-    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
-    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
-    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
-    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
-    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
-    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
-    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
-    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
-    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
-    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
-    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
-    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
-    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
+  return new ECSignature(r, s)
+}
 
-    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
-    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
-    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
-    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
-    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
-    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
-    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
-    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
-    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
-    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
-    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
-    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
-    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
-    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
-    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
-    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
+// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
+ECSignature.parseScriptSignature = function (buffer) {
+  var hashType = buffer.readUInt8(buffer.length - 1)
+  var hashTypeMod = hashType & ~0x80
 
-    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
-    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
-    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
-    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
-    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
-    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
-    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
-    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
-    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
-    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
-    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
-    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
-    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
-    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
-    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
-    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
+  if (hashTypeMod <= 0x00 || hashTypeMod >= 0x04) throw new Error('Invalid hashType ' + hashType)
 
-    a = safe_add(a, olda);
-    b = safe_add(b, oldb);
-    c = safe_add(c, oldc);
-    d = safe_add(d, oldd);
+  return {
+    signature: ECSignature.fromDER(buffer.slice(0, -1)),
+    hashType: hashType
   }
-  return Array(a, b, c, d);
-
 }
 
-/*
- * These functions implement the four basic operations the algorithm uses.
- */
-function md5_cmn(q, a, b, x, s, t)
-{
-  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
-}
-function md5_ff(a, b, c, d, x, s, t)
-{
-  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
-}
-function md5_gg(a, b, c, d, x, s, t)
-{
-  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
-}
-function md5_hh(a, b, c, d, x, s, t)
-{
-  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
-}
-function md5_ii(a, b, c, d, x, s, t)
-{
-  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
+ECSignature.prototype.toCompact = function (i, compressed) {
+  if (compressed) {
+    i += 4
+  }
+
+  i += 27
+
+  var buffer = Buffer.alloc(65)
+  buffer.writeUInt8(i, 0)
+  this.r.toBuffer(32).copy(buffer, 1)
+  this.s.toBuffer(32).copy(buffer, 33)
+
+  return buffer
 }
 
-/*
- * Add integers, wrapping at 2^32. This uses 16-bit operations internally
- * to work around bugs in some JS interpreters.
- */
-function safe_add(x, y)
-{
-  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
-  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
-  return (msw << 16) | (lsw & 0xFFFF);
+ECSignature.prototype.toDER = function () {
+  var r = Buffer.from(this.r.toDERInteger())
+  var s = Buffer.from(this.s.toDERInteger())
+
+  return bip66.encode(r, s)
 }
 
-/*
- * Bitwise rotate a 32-bit number to the left.
- */
-function bit_rol(num, cnt)
-{
-  return (num << cnt) | (num >>> (32 - cnt));
+ECSignature.prototype.toScriptSignature = function (hashType) {
+  var hashTypeMod = hashType & ~0x80
+  if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
+
+  var hashTypeBuffer = Buffer.alloc(1)
+  hashTypeBuffer.writeUInt8(hashType, 0)
+
+  return Buffer.concat([this.toDER(), hashTypeBuffer])
 }
 
-module.exports = function md5(buf) {
-  return helpers.hash(buf, core_md5, 16);
-};
-},{"./helpers":33}],35:[function(require,module,exports){
-arguments[4][12][0].apply(exports,arguments)
-},{"dup":12}],36:[function(require,module,exports){
-(function (Buffer){
-/*
-CryptoJS v3.1.2
-code.google.com/p/crypto-js
-(c) 2009-2013 by Jeff Mott. All rights reserved.
-code.google.com/p/crypto-js/wiki/License
-*/
-/** @preserve
-(c) 2012 by Cédric Mesnil. All rights reserved.
+module.exports = ECSignature
 
-Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+}).call(this,require("buffer").Buffer)
+},{"./types":78,"bigi":37,"bip66":39,"buffer":4,"typeforce":109}],49:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var base58check = require('bs58check')
+var bcrypto = require('./crypto')
+var createHmac = require('create-hmac')
+var typeforce = require('typeforce')
+var types = require('./types')
+var NETWORKS = require('./networks')
 
-    - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-    - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+var BigInteger = require('bigi')
+var ECPair = require('./ecpair')
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+var ecurve = require('ecurve')
+var curve = ecurve.getCurveByName('secp256k1')
 
-// constants table
-var zl = [
-  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-  7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
-  3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
-  1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
-  4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
-]
+function HDNode (keyPair, chainCode) {
+  typeforce(types.tuple('ECPair', types.Buffer256bit), arguments)
 
-var zr = [
-  5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
-  6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
-  15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
-  8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
-  12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
-]
+  if (!keyPair.compressed) throw new TypeError('BIP32 only allows compressed keyPairs')
 
-var sl = [
-  11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
-  7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
-  11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
-  11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
-  9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
-]
+  this.keyPair = keyPair
+  this.chainCode = chainCode
+  this.depth = 0
+  this.index = 0
+  this.parentFingerprint = 0x00000000
+}
 
-var sr = [
-  8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
-  9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
-  9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
-  15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
-  8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
-]
+HDNode.HIGHEST_BIT = 0x80000000
+HDNode.LENGTH = 78
+HDNode.MASTER_SECRET = Buffer.from('Bitcoin seed', 'utf8')
+
+HDNode.fromSeedBuffer = function (seed, network) {
+  typeforce(types.tuple(types.Buffer, types.maybe(types.Network)), arguments)
+
+  if (seed.length < 16) throw new TypeError('Seed should be at least 128 bits')
+  if (seed.length > 64) throw new TypeError('Seed should be at most 512 bits')
+
+  var I = createHmac('sha512', HDNode.MASTER_SECRET).update(seed).digest()
+  var IL = I.slice(0, 32)
+  var IR = I.slice(32)
 
-var hl = [0x00000000, 0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xA953FD4E]
-var hr = [0x50A28BE6, 0x5C4DD124, 0x6D703EF3, 0x7A6D76E9, 0x00000000]
+  // In case IL is 0 or >= n, the master key is invalid
+  // This is handled by the ECPair constructor
+  var pIL = BigInteger.fromBuffer(IL)
+  var keyPair = new ECPair(pIL, null, {
+    network: network
+  })
 
-function bytesToWords (bytes) {
-  var words = []
-  for (var i = 0, b = 0; i < bytes.length; i++, b += 8) {
-    words[b >>> 5] |= bytes[i] << (24 - b % 32)
-  }
-  return words
+  return new HDNode(keyPair, IR)
 }
 
-function wordsToBytes (words) {
-  var bytes = []
-  for (var b = 0; b < words.length * 32; b += 8) {
-    bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF)
-  }
-  return bytes
+HDNode.fromSeedHex = function (hex, network) {
+  return HDNode.fromSeedBuffer(Buffer.from(hex, 'hex'), network)
 }
 
-function processBlock (H, M, offset) {
-  // swap endian
-  for (var i = 0; i < 16; i++) {
-    var offset_i = offset + i
-    var M_offset_i = M[offset_i]
+HDNode.fromBase58 = function (string, networks) {
+  var buffer = base58check.decode(string)
+  if (buffer.length !== 78) throw new Error('Invalid buffer length')
 
-    // Swap
-    M[offset_i] = (
-      (((M_offset_i << 8) | (M_offset_i >>> 24)) & 0x00ff00ff) |
-      (((M_offset_i << 24) | (M_offset_i >>> 8)) & 0xff00ff00)
-    )
+  // 4 bytes: version bytes
+  var version = buffer.readUInt32BE(0)
+  var network
+
+  // list of networks?
+  if (Array.isArray(networks)) {
+    network = networks.filter(function (x) {
+      return version === x.bip32.private ||
+             version === x.bip32.public
+    }).pop()
+
+    if (!network) throw new Error('Unknown network version')
+
+  // otherwise, assume a network object (or default to bitcoin)
+  } else {
+    network = networks || NETWORKS.bitcoin
   }
 
-  // Working variables
-  var al, bl, cl, dl, el
-  var ar, br, cr, dr, er
+  if (version !== network.bip32.private &&
+    version !== network.bip32.public) throw new Error('Invalid network version')
 
-  ar = al = H[0]
-  br = bl = H[1]
-  cr = cl = H[2]
-  dr = dl = H[3]
-  er = el = H[4]
+  // 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ...
+  var depth = buffer[4]
 
-  // computation
-  var t
-  for (i = 0; i < 80; i += 1) {
-    t = (al + M[offset + zl[i]]) | 0
-    if (i < 16) {
-      t += f1(bl, cl, dl) + hl[0]
-    } else if (i < 32) {
-      t += f2(bl, cl, dl) + hl[1]
-    } else if (i < 48) {
-      t += f3(bl, cl, dl) + hl[2]
-    } else if (i < 64) {
-      t += f4(bl, cl, dl) + hl[3]
-    } else {// if (i<80) {
-      t += f5(bl, cl, dl) + hl[4]
-    }
-    t = t | 0
-    t = rotl(t, sl[i])
-    t = (t + el) | 0
-    al = el
-    el = dl
-    dl = rotl(cl, 10)
-    cl = bl
-    bl = t
+  // 4 bytes: the fingerprint of the parent's key (0x00000000 if master key)
+  var parentFingerprint = buffer.readUInt32BE(5)
+  if (depth === 0) {
+    if (parentFingerprint !== 0x00000000) throw new Error('Invalid parent fingerprint')
+  }
 
-    t = (ar + M[offset + zr[i]]) | 0
-    if (i < 16) {
-      t += f5(br, cr, dr) + hr[0]
-    } else if (i < 32) {
-      t += f4(br, cr, dr) + hr[1]
-    } else if (i < 48) {
-      t += f3(br, cr, dr) + hr[2]
-    } else if (i < 64) {
-      t += f2(br, cr, dr) + hr[3]
-    } else {// if (i<80) {
-      t += f1(br, cr, dr) + hr[4]
-    }
+  // 4 bytes: child number. This is the number i in xi = xpar/i, with xi the key being serialized.
+  // This is encoded in MSB order. (0x00000000 if master key)
+  var index = buffer.readUInt32BE(9)
+  if (depth === 0 && index !== 0) throw new Error('Invalid index')
 
-    t = t | 0
-    t = rotl(t, sr[i])
-    t = (t + er) | 0
-    ar = er
-    er = dr
-    dr = rotl(cr, 10)
-    cr = br
-    br = t
+  // 32 bytes: the chain code
+  var chainCode = buffer.slice(13, 45)
+  var keyPair
+
+  // 33 bytes: private key data (0x00 + k)
+  if (version === network.bip32.private) {
+    if (buffer.readUInt8(45) !== 0x00) throw new Error('Invalid private key')
+
+    var d = BigInteger.fromBuffer(buffer.slice(46, 78))
+    keyPair = new ECPair(d, null, { network: network })
+
+  // 33 bytes: public key data (0x02 + X or 0x03 + X)
+  } else {
+    var Q = ecurve.Point.decodeFrom(curve, buffer.slice(45, 78))
+    // Q.compressed is assumed, if somehow this assumption is broken, `new HDNode` will throw
+
+    // Verify that the X coordinate in the public point corresponds to a point on the curve.
+    // If not, the extended public key is invalid.
+    curve.validate(Q)
+
+    keyPair = new ECPair(null, Q, { network: network })
   }
 
-  // intermediate hash value
-  t = (H[1] + cl + dr) | 0
-  H[1] = (H[2] + dl + er) | 0
-  H[2] = (H[3] + el + ar) | 0
-  H[3] = (H[4] + al + br) | 0
-  H[4] = (H[0] + bl + cr) | 0
-  H[0] = t
+  var hd = new HDNode(keyPair, chainCode)
+  hd.depth = depth
+  hd.index = index
+  hd.parentFingerprint = parentFingerprint
+
+  return hd
 }
 
-function f1 (x, y, z) {
-  return ((x) ^ (y) ^ (z))
+HDNode.prototype.getAddress = function () {
+  return this.keyPair.getAddress()
 }
 
-function f2 (x, y, z) {
-  return (((x) & (y)) | ((~x) & (z)))
+HDNode.prototype.getIdentifier = function () {
+  return bcrypto.hash160(this.keyPair.getPublicKeyBuffer())
 }
 
-function f3 (x, y, z) {
-  return (((x) | (~(y))) ^ (z))
+HDNode.prototype.getFingerprint = function () {
+  return this.getIdentifier().slice(0, 4)
 }
 
-function f4 (x, y, z) {
-  return (((x) & (z)) | ((y) & (~(z))))
+HDNode.prototype.getNetwork = function () {
+  return this.keyPair.getNetwork()
 }
 
-function f5 (x, y, z) {
-  return ((x) ^ ((y) | (~(z))))
+HDNode.prototype.getPublicKeyBuffer = function () {
+  return this.keyPair.getPublicKeyBuffer()
 }
 
-function rotl (x, n) {
-  return (x << n) | (x >>> (32 - n))
+HDNode.prototype.neutered = function () {
+  var neuteredKeyPair = new ECPair(null, this.keyPair.Q, {
+    network: this.keyPair.network
+  })
+
+  var neutered = new HDNode(neuteredKeyPair, this.chainCode)
+  neutered.depth = this.depth
+  neutered.index = this.index
+  neutered.parentFingerprint = this.parentFingerprint
+
+  return neutered
 }
 
-function ripemd160 (message) {
-  var H = [0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0]
+HDNode.prototype.sign = function (hash) {
+  return this.keyPair.sign(hash)
+}
 
-  if (typeof message === 'string') {
-    message = new Buffer(message, 'utf8')
-  }
+HDNode.prototype.verify = function (hash, signature) {
+  return this.keyPair.verify(hash, signature)
+}
 
-  var m = bytesToWords(message)
+HDNode.prototype.toBase58 = function (__isPrivate) {
+  if (__isPrivate !== undefined) throw new TypeError('Unsupported argument in 2.0.0')
 
-  var nBitsLeft = message.length * 8
-  var nBitsTotal = message.length * 8
+  // Version
+  var network = this.keyPair.network
+  var version = (!this.isNeutered()) ? network.bip32.private : network.bip32.public
+  var buffer = Buffer.allocUnsafe(78)
 
-  // Add padding
-  m[nBitsLeft >>> 5] |= 0x80 << (24 - nBitsLeft % 32)
-  m[(((nBitsLeft + 64) >>> 9) << 4) + 14] = (
-    (((nBitsTotal << 8) | (nBitsTotal >>> 24)) & 0x00ff00ff) |
-    (((nBitsTotal << 24) | (nBitsTotal >>> 8)) & 0xff00ff00)
-  )
+  // 4 bytes: version bytes
+  buffer.writeUInt32BE(version, 0)
 
-  for (var i = 0; i < m.length; i += 16) {
-    processBlock(H, m, i)
-  }
+  // 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ....
+  buffer.writeUInt8(this.depth, 4)
 
-  // swap endian
-  for (i = 0; i < 5; i++) {
-    // shortcut
-    var H_i = H[i]
+  // 4 bytes: the fingerprint of the parent's key (0x00000000 if master key)
+  buffer.writeUInt32BE(this.parentFingerprint, 5)
 
-    // Swap
-    H[i] = (((H_i << 8) | (H_i >>> 24)) & 0x00ff00ff) |
-      (((H_i << 24) | (H_i >>> 8)) & 0xff00ff00)
+  // 4 bytes: child number. This is the number i in xi = xpar/i, with xi the key being serialized.
+  // This is encoded in big endian. (0x00000000 if master key)
+  buffer.writeUInt32BE(this.index, 9)
+
+  // 32 bytes: the chain code
+  this.chainCode.copy(buffer, 13)
+
+  // 33 bytes: the public key or private key data
+  if (!this.isNeutered()) {
+    // 0x00 + k for private keys
+    buffer.writeUInt8(0, 45)
+    this.keyPair.d.toBuffer(32).copy(buffer, 46)
+
+  // 33 bytes: the public key
+  } else {
+    // X9.62 encoding for public keys
+    this.keyPair.getPublicKeyBuffer().copy(buffer, 45)
   }
 
-  var digestbytes = wordsToBytes(H)
-  return new Buffer(digestbytes)
+  return base58check.encode(buffer)
 }
 
-module.exports = ripemd160
+// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#child-key-derivation-ckd-functions
+HDNode.prototype.derive = function (index) {
+  typeforce(types.UInt32, index)
 
-}).call(this,require("buffer").Buffer)
-},{"buffer":7}],37:[function(require,module,exports){
-(function (Buffer){
-// prototype class for hash functions
-function Hash (blockSize, finalSize) {
-  this._block = new Buffer(blockSize)
-  this._finalSize = finalSize
-  this._blockSize = blockSize
-  this._len = 0
-  this._s = 0
-}
+  var isHardened = index >= HDNode.HIGHEST_BIT
+  var data = Buffer.allocUnsafe(37)
 
-Hash.prototype.update = function (data, enc) {
-  if (typeof data === 'string') {
-    enc = enc || 'utf8'
-    data = new Buffer(data, enc)
-  }
+  // Hardened child
+  if (isHardened) {
+    if (this.isNeutered()) throw new TypeError('Could not derive hardened child key')
 
-  var l = this._len += data.length
-  var s = this._s || 0
-  var f = 0
-  var buffer = this._block
+    // data = 0x00 || ser256(kpar) || ser32(index)
+    data[0] = 0x00
+    this.keyPair.d.toBuffer(32).copy(data, 1)
+    data.writeUInt32BE(index, 33)
 
-  while (s < l) {
-    var t = Math.min(data.length, f + this._blockSize - (s % this._blockSize))
-    var ch = (t - f)
+  // Normal child
+  } else {
+    // data = serP(point(kpar)) || ser32(index)
+    //      = serP(Kpar) || ser32(index)
+    this.keyPair.getPublicKeyBuffer().copy(data, 0)
+    data.writeUInt32BE(index, 33)
+  }
 
-    for (var i = 0; i < ch; i++) {
-      buffer[(s % this._blockSize) + i] = data[i + f]
-    }
+  var I = createHmac('sha512', this.chainCode).update(data).digest()
+  var IL = I.slice(0, 32)
+  var IR = I.slice(32)
 
-    s += ch
-    f += ch
+  var pIL = BigInteger.fromBuffer(IL)
 
-    if ((s % this._blockSize) === 0) {
-      this._update(buffer)
-    }
+  // In case parse256(IL) >= n, proceed with the next value for i
+  if (pIL.compareTo(curve.n) >= 0) {
+    return this.derive(index + 1)
   }
-  this._s = s
 
-  return this
-}
+  // Private parent key -> private child key
+  var derivedKeyPair
+  if (!this.isNeutered()) {
+    // ki = parse256(IL) + kpar (mod n)
+    var ki = pIL.add(this.keyPair.d).mod(curve.n)
 
-Hash.prototype.digest = function (enc) {
-  // Suppose the length of the message M, in bits, is l
-  var l = this._len * 8
+    // In case ki == 0, proceed with the next value for i
+    if (ki.signum() === 0) {
+      return this.derive(index + 1)
+    }
 
-  // Append the bit 1 to the end of the message
-  this._block[this._len % this._blockSize] = 0x80
+    derivedKeyPair = new ECPair(ki, null, {
+      network: this.keyPair.network
+    })
 
-  // and then k zero bits, where k is the smallest non-negative solution to the equation (l + 1 + k) === finalSize mod blockSize
-  this._block.fill(0, this._len % this._blockSize + 1)
+  // Public parent key -> public child key
+  } else {
+    // Ki = point(parse256(IL)) + Kpar
+    //    = G*IL + Kpar
+    var Ki = curve.G.multiply(pIL).add(this.keyPair.Q)
 
-  if (l % (this._blockSize * 8) >= this._finalSize * 8) {
-    this._update(this._block)
-    this._block.fill(0)
+    // In case Ki is the point at infinity, proceed with the next value for i
+    if (curve.isInfinity(Ki)) {
+      return this.derive(index + 1)
+    }
+
+    derivedKeyPair = new ECPair(null, Ki, {
+      network: this.keyPair.network
+    })
   }
 
-  // to this append the block which is equal to the number l written in binary
-  // TODO: handle case where l is > Math.pow(2, 29)
-  this._block.writeInt32BE(l, this._blockSize - 4)
+  var hd = new HDNode(derivedKeyPair, IR)
+  hd.depth = this.depth + 1
+  hd.index = index
+  hd.parentFingerprint = this.getFingerprint().readUInt32BE(0)
 
-  var hash = this._update(this._block) || this._hash()
+  return hd
+}
 
-  return enc ? hash.toString(enc) : hash
+HDNode.prototype.deriveHardened = function (index) {
+  typeforce(types.UInt31, index)
+
+  // Only derives hardened private keys by default
+  return this.derive(index + HDNode.HIGHEST_BIT)
 }
 
-Hash.prototype._update = function () {
-  throw new Error('_update must be implemented by subclass')
+// Private === not neutered
+// Public === neutered
+HDNode.prototype.isNeutered = function () {
+  return !(this.keyPair.d)
 }
 
-module.exports = Hash
+HDNode.prototype.derivePath = function (path) {
+  typeforce(types.BIP32Path, path)
 
-}).call(this,require("buffer").Buffer)
-},{"buffer":7}],38:[function(require,module,exports){
-var exports = module.exports = function SHA (algorithm) {
-  algorithm = algorithm.toLowerCase()
+  var splitPath = path.split('/')
+  if (splitPath[0] === 'm') {
+    if (this.parentFingerprint) {
+      throw new Error('Not a master node')
+    }
 
-  var Algorithm = exports[algorithm]
-  if (!Algorithm) throw new Error(algorithm + ' is not supported (we accept pull requests)')
+    splitPath = splitPath.slice(1)
+  }
 
-  return new Algorithm()
+  return splitPath.reduce(function (prevHd, indexStr) {
+    var index
+    if (indexStr.slice(-1) === "'") {
+      index = parseInt(indexStr.slice(0, -1), 10)
+      return prevHd.deriveHardened(index)
+    } else {
+      index = parseInt(indexStr, 10)
+      return prevHd.derive(index)
+    }
+  }, this)
 }
 
-exports.sha = require('./sha')
-exports.sha1 = require('./sha1')
-exports.sha224 = require('./sha224')
-exports.sha256 = require('./sha256')
-exports.sha384 = require('./sha384')
-exports.sha512 = require('./sha512')
-
-},{"./sha":39,"./sha1":40,"./sha224":41,"./sha256":42,"./sha384":43,"./sha512":44}],39:[function(require,module,exports){
-(function (Buffer){
-/*
- * A JavaScript implementation of the Secure Hash Algorithm, SHA-0, as defined
- * in FIPS PUB 180-1
- * This source code is derived from sha1.js of the same repository.
- * The difference between SHA-0 and SHA-1 is just a bitwise rotate left
- * operation was added.
- */
+module.exports = HDNode
 
-var inherits = require('inherits')
-var Hash = require('./hash')
+},{"./crypto":45,"./ecpair":47,"./networks":51,"./types":78,"bigi":37,"bs58check":80,"create-hmac":85,"ecurve":89,"safe-buffer":98,"typeforce":109}],50:[function(require,module,exports){
+module.exports = {
+  Block: require('./block'),
+  ECPair: require('./ecpair'),
+  ECSignature: require('./ecsignature'),
+  HDNode: require('./hdnode'),
+  Transaction: require('./transaction'),
+  TransactionBuilder: require('./transaction_builder'),
 
-var W = new Array(80)
+  address: require('./address'),
+  bufferutils: require('./bufferutils'), // TODO: remove in 4.0.0
+  crypto: require('./crypto'),
+  networks: require('./networks'),
+  opcodes: require('bitcoin-ops'),
+  script: require('./script')
+}
 
-function Sha () {
-  this.init()
-  this._w = W
+},{"./address":42,"./block":43,"./bufferutils":44,"./crypto":45,"./ecpair":47,"./ecsignature":48,"./hdnode":49,"./networks":51,"./script":52,"./transaction":76,"./transaction_builder":77,"bitcoin-ops":40}],51:[function(require,module,exports){
+// https://en.bitcoin.it/wiki/List_of_address_prefixes
+// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
 
-  Hash.call(this, 64, 56)
+module.exports = {
+  bitcoin: {
+    messagePrefix: '\x18Bitcoin Signed Message:\n',
+    bip32: {
+      public: 0x0488b21e,
+      private: 0x0488ade4
+    },
+    pubKeyHash: 0x00,
+    scriptHash: 0x05,
+    wif: 0x80
+  },
+  testnet: {
+    messagePrefix: '\x18Bitcoin Signed Message:\n',
+    bip32: {
+      public: 0x043587cf,
+      private: 0x04358394
+    },
+    pubKeyHash: 0x6f,
+    scriptHash: 0xc4,
+    wif: 0xef
+  },
+  litecoin: {
+    messagePrefix: '\x19Litecoin Signed Message:\n',
+    bip32: {
+      public: 0x019da462,
+      private: 0x019d9cfe
+    },
+    pubKeyHash: 0x30,
+    scriptHash: 0x32,
+    wif: 0xb0
+  }
 }
 
-inherits(Sha, Hash)
+},{}],52:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var bip66 = require('bip66')
+var pushdata = require('pushdata-bitcoin')
+var typeforce = require('typeforce')
+var types = require('./types')
+var scriptNumber = require('./script_number')
 
-Sha.prototype.init = function () {
-  this._a = 0x67452301 | 0
-  this._b = 0xefcdab89 | 0
-  this._c = 0x98badcfe | 0
-  this._d = 0x10325476 | 0
-  this._e = 0xc3d2e1f0 | 0
+var OPS = require('bitcoin-ops')
+var REVERSE_OPS = require('bitcoin-ops/map')
+var OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
 
-  return this
+function isOPInt (value) {
+  return types.Number(value) &&
+    ((value === OPS.OP_0) ||
+    (value >= OPS.OP_1 && value <= OPS.OP_16) ||
+    (value === OPS.OP_1NEGATE))
 }
 
-/*
- * Bitwise rotate a 32-bit number to the left.
- */
-function rol (num, cnt) {
-  return (num << cnt) | (num >>> (32 - cnt))
+function isPushOnlyChunk (value) {
+  return types.Buffer(value) || isOPInt(value)
 }
 
-Sha.prototype._update = function (M) {
-  var W = this._w
-
-  var a = this._a
-  var b = this._b
-  var c = this._c
-  var d = this._d
-  var e = this._e
-
-  var j = 0, k
+function isPushOnly (value) {
+  return types.Array(value) && value.every(isPushOnlyChunk)
+}
 
-  /*
-   * SHA-1 has a bitwise rotate left operation. But, SHA is not
-   * function calcW() { return rol(W[j - 3] ^ W[j -  8] ^ W[j - 14] ^ W[j - 16], 1) }
-   */
-  function calcW () { return W[j - 3] ^ W[j - 8] ^ W[j - 14] ^ W[j - 16] }
-  function loop (w, f) {
-    W[j] = w
+function compile (chunks) {
+  // TODO: remove me
+  if (Buffer.isBuffer(chunks)) return chunks
 
-    var t = rol(a, 5) + f + e + w + k
+  typeforce(types.Array, chunks)
 
-    e = d
-    d = c
-    c = rol(b, 30)
-    b = a
-    a = t
-    j++
-  }
+  var bufferSize = chunks.reduce(function (accum, chunk) {
+    // data chunk
+    if (Buffer.isBuffer(chunk)) {
+      // adhere to BIP62.3, minimal push policy
+      if (chunk.length === 1 && (chunk[0] === 0x81 || (chunk[0] >= 1 && chunk[0] <= 16))) {
+        return accum + 1
+      }
 
-  k = 1518500249
-  while (j < 16) loop(M.readInt32BE(j * 4), (b & c) | ((~b) & d))
-  while (j < 20) loop(calcW(), (b & c) | ((~b) & d))
-  k = 1859775393
-  while (j < 40) loop(calcW(), b ^ c ^ d)
-  k = -1894007588
-  while (j < 60) loop(calcW(), (b & c) | (b & d) | (c & d))
-  k = -899497514
-  while (j < 80) loop(calcW(), b ^ c ^ d)
+      return accum + pushdata.encodingLength(chunk.length) + chunk.length
+    }
 
-  this._a = (a + this._a) | 0
-  this._b = (b + this._b) | 0
-  this._c = (c + this._c) | 0
-  this._d = (d + this._d) | 0
-  this._e = (e + this._e) | 0
-}
+    // opcode
+    return accum + 1
+  }, 0.0)
 
-Sha.prototype._hash = function () {
-  var H = new Buffer(20)
+  var buffer = Buffer.allocUnsafe(bufferSize)
+  var offset = 0
 
-  H.writeInt32BE(this._a | 0, 0)
-  H.writeInt32BE(this._b | 0, 4)
-  H.writeInt32BE(this._c | 0, 8)
-  H.writeInt32BE(this._d | 0, 12)
-  H.writeInt32BE(this._e | 0, 16)
+  chunks.forEach(function (chunk) {
+    // data chunk
+    if (Buffer.isBuffer(chunk)) {
+      // adhere to BIP62.3, minimal push policy
+      if (chunk.length === 1 && chunk[0] >= 1 && chunk[0] <= 16) {
+        var opcode = OP_INT_BASE + chunk[0]
+        buffer.writeUInt8(opcode, offset)
+        offset += 1
+        return
+      }
 
-  return H
-}
+      if (chunk.length === 1 && chunk[0] === 0x81) {
+        buffer.writeUInt8(OPS.OP_1NEGATE, offset)
+        offset += 1
+        return
+      }
 
-module.exports = Sha
+      offset += pushdata.encode(buffer, chunk.length, offset)
 
+      chunk.copy(buffer, offset)
+      offset += chunk.length
 
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"buffer":7,"inherits":35}],40:[function(require,module,exports){
-(function (Buffer){
-/*
- * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
- * in FIPS PUB 180-1
- * Version 2.1a Copyright Paul Johnston 2000 - 2002.
- * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- * Distributed under the BSD License
- * See http://pajhome.org.uk/crypt/md5 for details.
- */
+    // opcode
+    } else {
+      buffer.writeUInt8(chunk, offset)
+      offset += 1
+    }
+  })
 
-var inherits = require('inherits')
-var Hash = require('./hash')
+  if (offset !== buffer.length) throw new Error('Could not decode chunks')
+  return buffer
+}
 
-var W = new Array(80)
+function decompile (buffer) {
+  // TODO: remove me
+  if (types.Array(buffer)) return buffer
 
-function Sha1 () {
-  this.init()
-  this._w = W
+  typeforce(types.Buffer, buffer)
 
-  Hash.call(this, 64, 56)
-}
+  var chunks = []
+  var i = 0
 
-inherits(Sha1, Hash)
+  while (i < buffer.length) {
+    var opcode = buffer[i]
 
-Sha1.prototype.init = function () {
-  this._a = 0x67452301 | 0
-  this._b = 0xefcdab89 | 0
-  this._c = 0x98badcfe | 0
-  this._d = 0x10325476 | 0
-  this._e = 0xc3d2e1f0 | 0
+    // data chunk
+    if ((opcode > OPS.OP_0) && (opcode <= OPS.OP_PUSHDATA4)) {
+      var d = pushdata.decode(buffer, i)
 
-  return this
-}
+      // did reading a pushDataInt fail? empty script
+      if (d === null) return []
+      i += d.size
 
-/*
- * Bitwise rotate a 32-bit number to the left.
- */
-function rol (num, cnt) {
-  return (num << cnt) | (num >>> (32 - cnt))
-}
+      // attempt to read too much data? empty script
+      if (i + d.number > buffer.length) return []
 
-Sha1.prototype._update = function (M) {
-  var W = this._w
+      var data = buffer.slice(i, i + d.number)
+      i += d.number
 
-  var a = this._a
-  var b = this._b
-  var c = this._c
-  var d = this._d
-  var e = this._e
+      chunks.push(data)
 
-  var j = 0, k
+    // opcode
+    } else {
+      chunks.push(opcode)
 
-  function calcW () { return rol(W[j - 3] ^ W[j - 8] ^ W[j - 14] ^ W[j - 16], 1) }
-  function loop (w, f) {
-    W[j] = w
+      i += 1
+    }
+  }
 
-    var t = rol(a, 5) + f + e + w + k
+  return chunks
+}
 
-    e = d
-    d = c
-    c = rol(b, 30)
-    b = a
-    a = t
-    j++
+function toASM (chunks) {
+  if (Buffer.isBuffer(chunks)) {
+    chunks = decompile(chunks)
   }
 
-  k = 1518500249
-  while (j < 16) loop(M.readInt32BE(j * 4), (b & c) | ((~b) & d))
-  while (j < 20) loop(calcW(), (b & c) | ((~b) & d))
-  k = 1859775393
-  while (j < 40) loop(calcW(), b ^ c ^ d)
-  k = -1894007588
-  while (j < 60) loop(calcW(), (b & c) | (b & d) | (c & d))
-  k = -899497514
-  while (j < 80) loop(calcW(), b ^ c ^ d)
+  return chunks.map(function (chunk) {
+    // data?
+    if (Buffer.isBuffer(chunk)) return chunk.toString('hex')
 
-  this._a = (a + this._a) | 0
-  this._b = (b + this._b) | 0
-  this._c = (c + this._c) | 0
-  this._d = (d + this._d) | 0
-  this._e = (e + this._e) | 0
+    // opcode!
+    return REVERSE_OPS[chunk]
+  }).join(' ')
 }
 
-Sha1.prototype._hash = function () {
-  var H = new Buffer(20)
+function fromASM (asm) {
+  typeforce(types.String, asm)
 
-  H.writeInt32BE(this._a | 0, 0)
-  H.writeInt32BE(this._b | 0, 4)
-  H.writeInt32BE(this._c | 0, 8)
-  H.writeInt32BE(this._d | 0, 12)
-  H.writeInt32BE(this._e | 0, 16)
+  return compile(asm.split(' ').map(function (chunkStr) {
+    // opcode?
+    if (OPS[chunkStr] !== undefined) return OPS[chunkStr]
+    typeforce(types.Hex, chunkStr)
 
-  return H
+    // data!
+    return Buffer.from(chunkStr, 'hex')
+  }))
 }
 
-module.exports = Sha1
-
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"buffer":7,"inherits":35}],41:[function(require,module,exports){
-(function (Buffer){
-/**
- * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
- * in FIPS 180-2
- * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
- * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- *
- */
+function toStack (chunks) {
+  chunks = decompile(chunks)
+  typeforce(isPushOnly, chunks)
 
-var inherits = require('inherits')
-var Sha256 = require('./sha256')
-var Hash = require('./hash')
+  return chunks.map(function (op) {
+    if (Buffer.isBuffer(op)) return op
+    if (op === OPS.OP_0) return Buffer.allocUnsafe(0)
 
-var W = new Array(64)
+    return scriptNumber.encode(op - OP_INT_BASE)
+  })
+}
 
-function Sha224 () {
-  this.init()
+function isCanonicalPubKey (buffer) {
+  if (!Buffer.isBuffer(buffer)) return false
+  if (buffer.length < 33) return false
 
-  this._w = W // new Array(64)
+  switch (buffer[0]) {
+    case 0x02:
+    case 0x03:
+      return buffer.length === 33
+    case 0x04:
+      return buffer.length === 65
+  }
 
-  Hash.call(this, 64, 56)
+  return false
 }
 
-inherits(Sha224, Sha256)
+function isDefinedHashType (hashType) {
+  var hashTypeMod = hashType & ~0x80
+
+// return hashTypeMod > SIGHASH_ALL && hashTypeMod < SIGHASH_SINGLE
+  return hashTypeMod > 0x00 && hashTypeMod < 0x04
+}
 
-Sha224.prototype.init = function () {
-  this._a = 0xc1059ed8 | 0
-  this._b = 0x367cd507 | 0
-  this._c = 0x3070dd17 | 0
-  this._d = 0xf70e5939 | 0
-  this._e = 0xffc00b31 | 0
-  this._f = 0x68581511 | 0
-  this._g = 0x64f98fa7 | 0
-  this._h = 0xbefa4fa4 | 0
+function isCanonicalSignature (buffer) {
+  if (!Buffer.isBuffer(buffer)) return false
+  if (!isDefinedHashType(buffer[buffer.length - 1])) return false
 
-  return this
+  return bip66.check(buffer.slice(0, -1))
 }
 
-Sha224.prototype._hash = function () {
-  var H = new Buffer(28)
+module.exports = {
+  compile: compile,
+  decompile: decompile,
+  fromASM: fromASM,
+  toASM: toASM,
+  toStack: toStack,
 
-  H.writeInt32BE(this._a, 0)
-  H.writeInt32BE(this._b, 4)
-  H.writeInt32BE(this._c, 8)
-  H.writeInt32BE(this._d, 12)
-  H.writeInt32BE(this._e, 16)
-  H.writeInt32BE(this._f, 20)
-  H.writeInt32BE(this._g, 24)
+  number: require('./script_number'),
 
-  return H
+  isCanonicalPubKey: isCanonicalPubKey,
+  isCanonicalSignature: isCanonicalSignature,
+  isPushOnly: isPushOnly,
+  isDefinedHashType: isDefinedHashType
 }
 
-module.exports = Sha224
+var templates = require('./templates')
+for (var key in templates) {
+  module.exports[key] = templates[key]
+}
 
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"./sha256":42,"buffer":7,"inherits":35}],42:[function(require,module,exports){
-(function (Buffer){
-/**
- * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
- * in FIPS 180-2
- * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
- * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- *
- */
+},{"./script_number":53,"./templates":54,"./types":78,"bip66":39,"bitcoin-ops":40,"bitcoin-ops/map":41,"pushdata-bitcoin":95,"safe-buffer":98,"typeforce":109}],53:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
 
-var inherits = require('inherits')
-var Hash = require('./hash')
+function decode (buffer, maxLength, minimal) {
+  maxLength = maxLength || 4
+  minimal = minimal === undefined ? true : minimal
 
-var K = [
-  0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
-  0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
-  0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
-  0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
-  0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
-  0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
-  0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
-  0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
-  0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
-  0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
-  0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
-  0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
-  0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
-  0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
-  0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
-  0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
-]
+  var length = buffer.length
+  if (length === 0) return 0
+  if (length > maxLength) throw new TypeError('Script number overflow')
+  if (minimal) {
+    if ((buffer[length - 1] & 0x7f) === 0) {
+      if (length <= 1 || (buffer[length - 2] & 0x80) === 0) throw new Error('Non-minimally encoded script number')
+    }
+  }
 
-var W = new Array(64)
+  // 40-bit
+  if (length === 5) {
+    var a = buffer.readUInt32LE(0)
+    var b = buffer.readUInt8(4)
 
-function Sha256 () {
-  this.init()
+    if (b & 0x80) return -(((b & ~0x80) * 0x100000000) + a)
+    return (b * 0x100000000) + a
+  }
 
-  this._w = W // new Array(64)
+  var result = 0
 
-  Hash.call(this, 64, 56)
+  // 32-bit / 24-bit / 16-bit / 8-bit
+  for (var i = 0; i < length; ++i) {
+    result |= buffer[i] << (8 * i)
+  }
+
+  if (buffer[length - 1] & 0x80) return -(result & ~(0x80 << (8 * (length - 1))))
+  return result
 }
 
-inherits(Sha256, Hash)
+function scriptNumSize (i) {
+  return i > 0x7fffffff ? 5
+  : i > 0x7fffff ? 4
+  : i > 0x7fff ? 3
+  : i > 0x7f ? 2
+  : i > 0x00 ? 1
+  : 0
+}
 
-Sha256.prototype.init = function () {
-  this._a = 0x6a09e667 | 0
-  this._b = 0xbb67ae85 | 0
-  this._c = 0x3c6ef372 | 0
-  this._d = 0xa54ff53a | 0
-  this._e = 0x510e527f | 0
-  this._f = 0x9b05688c | 0
-  this._g = 0x1f83d9ab | 0
-  this._h = 0x5be0cd19 | 0
+function encode (number) {
+  var value = Math.abs(number)
+  var size = scriptNumSize(value)
+  var buffer = Buffer.allocUnsafe(size)
+  var negative = number < 0
 
-  return this
-}
+  for (var i = 0; i < size; ++i) {
+    buffer.writeUInt8(value & 0xff, i)
+    value >>= 8
+  }
+
+  if (buffer[size - 1] & 0x80) {
+    buffer.writeUInt8(negative ? 0x80 : 0x00, size - 1)
+  } else if (negative) {
+    buffer[size - 1] |= 0x80
+  }
 
-function S (X, n) {
-  return (X >>> n) | (X << (32 - n))
+  return buffer
 }
 
-function R (X, n) {
-  return (X >>> n)
+module.exports = {
+  decode: decode,
+  encode: encode
 }
 
-function Ch (x, y, z) {
-  return ((x & y) ^ ((~x) & z))
+},{"safe-buffer":98}],54:[function(require,module,exports){
+var decompile = require('../script').decompile
+var multisig = require('./multisig')
+var nullData = require('./nulldata')
+var pubKey = require('./pubkey')
+var pubKeyHash = require('./pubkeyhash')
+var scriptHash = require('./scripthash')
+var witnessPubKeyHash = require('./witnesspubkeyhash')
+var witnessScriptHash = require('./witnessscripthash')
+var witnessCommitment = require('./witnesscommitment')
+
+var types = {
+  MULTISIG: 'multisig',
+  NONSTANDARD: 'nonstandard',
+  NULLDATA: 'nulldata',
+  P2PK: 'pubkey',
+  P2PKH: 'pubkeyhash',
+  P2SH: 'scripthash',
+  P2WPKH: 'witnesspubkeyhash',
+  P2WSH: 'witnessscripthash',
+  WITNESS_COMMITMENT: 'witnesscommitment'
 }
 
-function Maj (x, y, z) {
-  return ((x & y) ^ (x & z) ^ (y & z))
+function classifyOutput (script) {
+  if (witnessPubKeyHash.output.check(script)) return types.P2WPKH
+  if (witnessScriptHash.output.check(script)) return types.P2WSH
+  if (pubKeyHash.output.check(script)) return types.P2PKH
+  if (scriptHash.output.check(script)) return types.P2SH
+
+  // XXX: optimization, below functions .decompile before use
+  var chunks = decompile(script)
+  if (multisig.output.check(chunks)) return types.MULTISIG
+  if (pubKey.output.check(chunks)) return types.P2PK
+  if (witnessCommitment.output.check(chunks)) return types.WITNESS_COMMITMENT
+  if (nullData.output.check(chunks)) return types.NULLDATA
+
+  return types.NONSTANDARD
 }
 
-function Sigma0256 (x) {
-  return (S(x, 2) ^ S(x, 13) ^ S(x, 22))
+function classifyInput (script, allowIncomplete) {
+  // XXX: optimization, below functions .decompile before use
+  var chunks = decompile(script)
+
+  if (pubKeyHash.input.check(chunks)) return types.P2PKH
+  if (scriptHash.input.check(chunks, allowIncomplete)) return types.P2SH
+  if (multisig.input.check(chunks, allowIncomplete)) return types.MULTISIG
+  if (pubKey.input.check(chunks)) return types.P2PK
+
+  return types.NONSTANDARD
 }
 
-function Sigma1256 (x) {
-  return (S(x, 6) ^ S(x, 11) ^ S(x, 25))
+function classifyWitness (script, allowIncomplete) {
+  // XXX: optimization, below functions .decompile before use
+  var chunks = decompile(script)
+
+  if (witnessPubKeyHash.input.check(chunks)) return types.P2WPKH
+  if (witnessScriptHash.input.check(chunks, allowIncomplete)) return types.P2WSH
+
+  return types.NONSTANDARD
 }
 
-function Gamma0256 (x) {
-  return (S(x, 7) ^ S(x, 18) ^ R(x, 3))
+module.exports = {
+  classifyInput: classifyInput,
+  classifyOutput: classifyOutput,
+  classifyWitness: classifyWitness,
+  multisig: multisig,
+  nullData: nullData,
+  pubKey: pubKey,
+  pubKeyHash: pubKeyHash,
+  scriptHash: scriptHash,
+  witnessPubKeyHash: witnessPubKeyHash,
+  witnessScriptHash: witnessScriptHash,
+  witnessCommitment: witnessCommitment,
+  types: types
+}
+
+},{"../script":52,"./multisig":55,"./nulldata":58,"./pubkey":59,"./pubkeyhash":62,"./scripthash":65,"./witnesscommitment":68,"./witnesspubkeyhash":70,"./witnessscripthash":73}],55:[function(require,module,exports){
+module.exports = {
+  input: require('./input'),
+  output: require('./output')
 }
 
-function Gamma1256 (x) {
-  return (S(x, 17) ^ S(x, 19) ^ R(x, 10))
+},{"./input":56,"./output":57}],56:[function(require,module,exports){
+// OP_0 [signatures ...]
+
+var Buffer = require('safe-buffer').Buffer
+var bscript = require('../../script')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
+
+function partialSignature (value) {
+  return value === OPS.OP_0 || bscript.isCanonicalSignature(value)
 }
 
-Sha256.prototype._update = function (M) {
-  var W = this._w
+function check (script, allowIncomplete) {
+  var chunks = bscript.decompile(script)
+  if (chunks.length < 2) return false
+  if (chunks[0] !== OPS.OP_0) return false
 
-  var a = this._a | 0
-  var b = this._b | 0
-  var c = this._c | 0
-  var d = this._d | 0
-  var e = this._e | 0
-  var f = this._f | 0
-  var g = this._g | 0
-  var h = this._h | 0
+  if (allowIncomplete) {
+    return chunks.slice(1).every(partialSignature)
+  }
 
-  var j = 0
+  return chunks.slice(1).every(bscript.isCanonicalSignature)
+}
+check.toJSON = function () { return 'multisig input' }
 
-  function calcW () { return Gamma1256(W[j - 2]) + W[j - 7] + Gamma0256(W[j - 15]) + W[j - 16] }
-  function loop (w) {
-    W[j] = w
+var EMPTY_BUFFER = Buffer.allocUnsafe(0)
 
-    var T1 = h + Sigma1256(e) + Ch(e, f, g) + K[j] + w
-    var T2 = Sigma0256(a) + Maj(a, b, c)
+function encodeStack (signatures, scriptPubKey) {
+  typeforce([partialSignature], signatures)
 
-    h = g
-    g = f
-    f = e
-    e = d + T1
-    d = c
-    c = b
-    b = a
-    a = T1 + T2
+  if (scriptPubKey) {
+    var scriptData = bscript.multisig.output.decode(scriptPubKey)
 
-    j++
-  }
+    if (signatures.length < scriptData.m) {
+      throw new TypeError('Not enough signatures provided')
+    }
 
-  while (j < 16) loop(M.readInt32BE(j * 4))
-  while (j < 64) loop(calcW())
+    if (signatures.length > scriptData.pubKeys.length) {
+      throw new TypeError('Too many signatures provided')
+    }
+  }
 
-  this._a = (a + this._a) | 0
-  this._b = (b + this._b) | 0
-  this._c = (c + this._c) | 0
-  this._d = (d + this._d) | 0
-  this._e = (e + this._e) | 0
-  this._f = (f + this._f) | 0
-  this._g = (g + this._g) | 0
-  this._h = (h + this._h) | 0
+  return [].concat(EMPTY_BUFFER, signatures)
 }
 
-Sha256.prototype._hash = function () {
-  var H = new Buffer(32)
+function encode (signatures, scriptPubKey) {
+  return bscript.compile(encodeStack(signatures, scriptPubKey))
+}
 
-  H.writeInt32BE(this._a, 0)
-  H.writeInt32BE(this._b, 4)
-  H.writeInt32BE(this._c, 8)
-  H.writeInt32BE(this._d, 12)
-  H.writeInt32BE(this._e, 16)
-  H.writeInt32BE(this._f, 20)
-  H.writeInt32BE(this._g, 24)
-  H.writeInt32BE(this._h, 28)
+function decodeStack (stack, allowIncomplete) {
+  typeforce(check, stack, allowIncomplete)
+  return stack.slice(1)
+}
 
-  return H
+function decode (buffer, allowIncomplete) {
+  var stack = bscript.decompile(buffer)
+  return decodeStack(stack, allowIncomplete)
 }
 
-module.exports = Sha256
+module.exports = {
+  check: check,
+  decode: decode,
+  decodeStack: decodeStack,
+  encode: encode,
+  encodeStack: encodeStack
+}
 
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"buffer":7,"inherits":35}],43:[function(require,module,exports){
-(function (Buffer){
-var inherits = require('inherits')
-var SHA512 = require('./sha512')
-var Hash = require('./hash')
+},{"../../script":52,"bitcoin-ops":40,"safe-buffer":98,"typeforce":109}],57:[function(require,module,exports){
+// m [pubKeys ...] n OP_CHECKMULTISIG
 
-var W = new Array(160)
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
+var OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
+
+function check (script, allowIncomplete) {
+  var chunks = bscript.decompile(script)
+
+  if (chunks.length < 4) return false
+  if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) return false
+  if (!types.Number(chunks[0])) return false
+  if (!types.Number(chunks[chunks.length - 2])) return false
+  var m = chunks[0] - OP_INT_BASE
+  var n = chunks[chunks.length - 2] - OP_INT_BASE
+
+  if (m <= 0) return false
+  if (n > 16) return false
+  if (m > n) return false
+  if (n !== chunks.length - 3) return false
+  if (allowIncomplete) return true
+
+  var keys = chunks.slice(1, -2)
+  return keys.every(bscript.isCanonicalPubKey)
+}
+check.toJSON = function () { return 'multi-sig output' }
+
+function encode (m, pubKeys) {
+  typeforce({
+    m: types.Number,
+    pubKeys: [bscript.isCanonicalPubKey]
+  }, {
+    m: m,
+    pubKeys: pubKeys
+  })
 
-function Sha384 () {
-  this.init()
-  this._w = W
+  var n = pubKeys.length
+  if (n < m) throw new TypeError('Not enough pubKeys provided')
 
-  Hash.call(this, 128, 112)
+  return bscript.compile([].concat(
+    OP_INT_BASE + m,
+    pubKeys,
+    OP_INT_BASE + n,
+    OPS.OP_CHECKMULTISIG
+  ))
 }
 
-inherits(Sha384, SHA512)
+function decode (buffer, allowIncomplete) {
+  var chunks = bscript.decompile(buffer)
+  typeforce(check, chunks, allowIncomplete)
 
-Sha384.prototype.init = function () {
-  this._a = 0xcbbb9d5d | 0
-  this._b = 0x629a292a | 0
-  this._c = 0x9159015a | 0
-  this._d = 0x152fecd8 | 0
-  this._e = 0x67332667 | 0
-  this._f = 0x8eb44a87 | 0
-  this._g = 0xdb0c2e0d | 0
-  this._h = 0x47b5481d | 0
-
-  this._al = 0xc1059ed8 | 0
-  this._bl = 0x367cd507 | 0
-  this._cl = 0x3070dd17 | 0
-  this._dl = 0xf70e5939 | 0
-  this._el = 0xffc00b31 | 0
-  this._fl = 0x68581511 | 0
-  this._gl = 0x64f98fa7 | 0
-  this._hl = 0xbefa4fa4 | 0
+  return {
+    m: chunks[0] - OP_INT_BASE,
+    pubKeys: chunks.slice(1, -2)
+  }
+}
 
-  return this
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
 }
 
-Sha384.prototype._hash = function () {
-  var H = new Buffer(48)
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"typeforce":109}],58:[function(require,module,exports){
+// OP_RETURN {data}
 
-  function writeInt64BE (h, l, offset) {
-    H.writeInt32BE(h, offset)
-    H.writeInt32BE(l, offset + 4)
-  }
+var bscript = require('../script')
+var types = require('../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
 
-  writeInt64BE(this._a, this._al, 0)
-  writeInt64BE(this._b, this._bl, 8)
-  writeInt64BE(this._c, this._cl, 16)
-  writeInt64BE(this._d, this._dl, 24)
-  writeInt64BE(this._e, this._el, 32)
-  writeInt64BE(this._f, this._fl, 40)
+function check (script) {
+  var buffer = bscript.compile(script)
 
-  return H
+  return buffer.length > 1 &&
+    buffer[0] === OPS.OP_RETURN
 }
+check.toJSON = function () { return 'null data output' }
 
-module.exports = Sha384
-
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"./sha512":44,"buffer":7,"inherits":35}],44:[function(require,module,exports){
-(function (Buffer){
-var inherits = require('inherits')
-var Hash = require('./hash')
+function encode (data) {
+  typeforce(types.Buffer, data)
 
-var K = [
-  0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
-  0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
-  0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
-  0x923f82a4, 0xaf194f9b, 0xab1c5ed5, 0xda6d8118,
-  0xd807aa98, 0xa3030242, 0x12835b01, 0x45706fbe,
-  0x243185be, 0x4ee4b28c, 0x550c7dc3, 0xd5ffb4e2,
-  0x72be5d74, 0xf27b896f, 0x80deb1fe, 0x3b1696b1,
-  0x9bdc06a7, 0x25c71235, 0xc19bf174, 0xcf692694,
-  0xe49b69c1, 0x9ef14ad2, 0xefbe4786, 0x384f25e3,
-  0x0fc19dc6, 0x8b8cd5b5, 0x240ca1cc, 0x77ac9c65,
-  0x2de92c6f, 0x592b0275, 0x4a7484aa, 0x6ea6e483,
-  0x5cb0a9dc, 0xbd41fbd4, 0x76f988da, 0x831153b5,
-  0x983e5152, 0xee66dfab, 0xa831c66d, 0x2db43210,
-  0xb00327c8, 0x98fb213f, 0xbf597fc7, 0xbeef0ee4,
-  0xc6e00bf3, 0x3da88fc2, 0xd5a79147, 0x930aa725,
-  0x06ca6351, 0xe003826f, 0x14292967, 0x0a0e6e70,
-  0x27b70a85, 0x46d22ffc, 0x2e1b2138, 0x5c26c926,
-  0x4d2c6dfc, 0x5ac42aed, 0x53380d13, 0x9d95b3df,
-  0x650a7354, 0x8baf63de, 0x766a0abb, 0x3c77b2a8,
-  0x81c2c92e, 0x47edaee6, 0x92722c85, 0x1482353b,
-  0xa2bfe8a1, 0x4cf10364, 0xa81a664b, 0xbc423001,
-  0xc24b8b70, 0xd0f89791, 0xc76c51a3, 0x0654be30,
-  0xd192e819, 0xd6ef5218, 0xd6990624, 0x5565a910,
-  0xf40e3585, 0x5771202a, 0x106aa070, 0x32bbd1b8,
-  0x19a4c116, 0xb8d2d0c8, 0x1e376c08, 0x5141ab53,
-  0x2748774c, 0xdf8eeb99, 0x34b0bcb5, 0xe19b48a8,
-  0x391c0cb3, 0xc5c95a63, 0x4ed8aa4a, 0xe3418acb,
-  0x5b9cca4f, 0x7763e373, 0x682e6ff3, 0xd6b2b8a3,
-  0x748f82ee, 0x5defb2fc, 0x78a5636f, 0x43172f60,
-  0x84c87814, 0xa1f0ab72, 0x8cc70208, 0x1a6439ec,
-  0x90befffa, 0x23631e28, 0xa4506ceb, 0xde82bde9,
-  0xbef9a3f7, 0xb2c67915, 0xc67178f2, 0xe372532b,
-  0xca273ece, 0xea26619c, 0xd186b8c7, 0x21c0c207,
-  0xeada7dd6, 0xcde0eb1e, 0xf57d4f7f, 0xee6ed178,
-  0x06f067aa, 0x72176fba, 0x0a637dc5, 0xa2c898a6,
-  0x113f9804, 0xbef90dae, 0x1b710b35, 0x131c471b,
-  0x28db77f5, 0x23047d84, 0x32caab7b, 0x40c72493,
-  0x3c9ebe0a, 0x15c9bebc, 0x431d67c4, 0x9c100d4c,
-  0x4cc5d4be, 0xcb3e42b6, 0x597f299c, 0xfc657e2a,
-  0x5fcb6fab, 0x3ad6faec, 0x6c44198c, 0x4a475817
-]
+  return bscript.compile([OPS.OP_RETURN, data])
+}
 
-var W = new Array(160)
+function decode (buffer) {
+  typeforce(check, buffer)
 
-function Sha512 () {
-  this.init()
-  this._w = W
+  return buffer.slice(2)
+}
 
-  Hash.call(this, 128, 112)
+module.exports = {
+  output: {
+    check: check,
+    decode: decode,
+    encode: encode
+  }
 }
 
-inherits(Sha512, Hash)
+},{"../script":52,"../types":78,"bitcoin-ops":40,"typeforce":109}],59:[function(require,module,exports){
+arguments[4][55][0].apply(exports,arguments)
+},{"./input":60,"./output":61,"dup":55}],60:[function(require,module,exports){
+// {signature}
 
-Sha512.prototype.init = function () {
-  this._a = 0x6a09e667 | 0
-  this._b = 0xbb67ae85 | 0
-  this._c = 0x3c6ef372 | 0
-  this._d = 0xa54ff53a | 0
-  this._e = 0x510e527f | 0
-  this._f = 0x9b05688c | 0
-  this._g = 0x1f83d9ab | 0
-  this._h = 0x5be0cd19 | 0
-
-  this._al = 0xf3bcc908 | 0
-  this._bl = 0x84caa73b | 0
-  this._cl = 0xfe94f82b | 0
-  this._dl = 0x5f1d36f1 | 0
-  this._el = 0xade682d1 | 0
-  this._fl = 0x2b3e6c1f | 0
-  this._gl = 0xfb41bd6b | 0
-  this._hl = 0x137e2179 | 0
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
 
-  return this
+function check (script) {
+  var chunks = bscript.decompile(script)
+
+  return chunks.length === 1 &&
+    bscript.isCanonicalSignature(chunks[0])
 }
+check.toJSON = function () { return 'pubKey input' }
 
-function S (X, Xl, n) {
-  return (X >>> n) | (Xl << (32 - n))
+function encodeStack (signature) {
+  typeforce(types.Buffer, signature)
+  return [signature]
 }
 
-function Ch (x, y, z) {
-  return ((x & y) ^ ((~x) & z))
+function encode (signature) {
+  return bscript.compile(encodeStack(signature))
 }
 
-function Maj (x, y, z) {
-  return ((x & y) ^ (x & z) ^ (y & z))
+function decodeStack (stack) {
+  typeforce(check, stack)
+  return stack[0]
 }
 
-Sha512.prototype._update = function (M) {
-  var W = this._w
+function decode (buffer) {
+  var stack = bscript.decompile(buffer)
+  return decodeStack(stack)
+}
 
-  var a = this._a | 0
-  var b = this._b | 0
-  var c = this._c | 0
-  var d = this._d | 0
-  var e = this._e | 0
-  var f = this._f | 0
-  var g = this._g | 0
-  var h = this._h | 0
+module.exports = {
+  check: check,
+  decode: decode,
+  decodeStack: decodeStack,
+  encode: encode,
+  encodeStack: encodeStack
+}
 
-  var al = this._al | 0
-  var bl = this._bl | 0
-  var cl = this._cl | 0
-  var dl = this._dl | 0
-  var el = this._el | 0
-  var fl = this._fl | 0
-  var gl = this._gl | 0
-  var hl = this._hl | 0
+},{"../../script":52,"../../types":78,"typeforce":109}],61:[function(require,module,exports){
+// {pubKey} OP_CHECKSIG
 
-  var i = 0, j = 0
-  var Wi, Wil
-  function calcW () {
-    var x = W[j - 15 * 2]
-    var xl = W[j - 15 * 2 + 1]
-    var gamma0 = S(x, xl, 1) ^ S(x, xl, 8) ^ (x >>> 7)
-    var gamma0l = S(xl, x, 1) ^ S(xl, x, 8) ^ S(xl, x, 7)
+var bscript = require('../../script')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
 
-    x = W[j - 2 * 2]
-    xl = W[j - 2 * 2 + 1]
-    var gamma1 = S(x, xl, 19) ^ S(xl, x, 29) ^ (x >>> 6)
-    var gamma1l = S(xl, x, 19) ^ S(x, xl, 29) ^ S(xl, x, 6)
+function check (script) {
+  var chunks = bscript.decompile(script)
 
-    // W[i] = gamma0 + W[i - 7] + gamma1 + W[i - 16]
-    var Wi7 = W[j - 7 * 2]
-    var Wi7l = W[j - 7 * 2 + 1]
+  return chunks.length === 2 &&
+    bscript.isCanonicalPubKey(chunks[0]) &&
+    chunks[1] === OPS.OP_CHECKSIG
+}
+check.toJSON = function () { return 'pubKey output' }
 
-    var Wi16 = W[j - 16 * 2]
-    var Wi16l = W[j - 16 * 2 + 1]
+function encode (pubKey) {
+  typeforce(bscript.isCanonicalPubKey, pubKey)
 
-    Wil = gamma0l + Wi7l
-    Wi = gamma0 + Wi7 + ((Wil >>> 0) < (gamma0l >>> 0) ? 1 : 0)
-    Wil = Wil + gamma1l
-    Wi = Wi + gamma1 + ((Wil >>> 0) < (gamma1l >>> 0) ? 1 : 0)
-    Wil = Wil + Wi16l
-    Wi = Wi + Wi16 + ((Wil >>> 0) < (Wi16l >>> 0) ? 1 : 0)
-  }
+  return bscript.compile([pubKey, OPS.OP_CHECKSIG])
+}
 
-  function loop () {
-    W[j] = Wi
-    W[j + 1] = Wil
+function decode (buffer) {
+  var chunks = bscript.decompile(buffer)
+  typeforce(check, chunks)
 
-    var maj = Maj(a, b, c)
-    var majl = Maj(al, bl, cl)
+  return chunks[0]
+}
 
-    var sigma0h = S(a, al, 28) ^ S(al, a, 2) ^ S(al, a, 7)
-    var sigma0l = S(al, a, 28) ^ S(a, al, 2) ^ S(a, al, 7)
-    var sigma1h = S(e, el, 14) ^ S(e, el, 18) ^ S(el, e, 9)
-    var sigma1l = S(el, e, 14) ^ S(el, e, 18) ^ S(e, el, 9)
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
 
-    // t1 = h + sigma1 + ch + K[i] + W[i]
-    var Ki = K[j]
-    var Kil = K[j + 1]
+},{"../../script":52,"bitcoin-ops":40,"typeforce":109}],62:[function(require,module,exports){
+arguments[4][55][0].apply(exports,arguments)
+},{"./input":63,"./output":64,"dup":55}],63:[function(require,module,exports){
+// {signature} {pubKey}
 
-    var ch = Ch(e, f, g)
-    var chl = Ch(el, fl, gl)
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
 
-    var t1l = hl + sigma1l
-    var t1 = h + sigma1h + ((t1l >>> 0) < (hl >>> 0) ? 1 : 0)
-    t1l = t1l + chl
-    t1 = t1 + ch + ((t1l >>> 0) < (chl >>> 0) ? 1 : 0)
-    t1l = t1l + Kil
-    t1 = t1 + Ki + ((t1l >>> 0) < (Kil >>> 0) ? 1 : 0)
-    t1l = t1l + Wil
-    t1 = t1 + Wi + ((t1l >>> 0) < (Wil >>> 0) ? 1 : 0)
+function check (script) {
+  var chunks = bscript.decompile(script)
 
-    // t2 = sigma0 + maj
-    var t2l = sigma0l + majl
-    var t2 = sigma0h + maj + ((t2l >>> 0) < (sigma0l >>> 0) ? 1 : 0)
+  return chunks.length === 2 &&
+    bscript.isCanonicalSignature(chunks[0]) &&
+    bscript.isCanonicalPubKey(chunks[1])
+}
+check.toJSON = function () { return 'pubKeyHash input' }
 
-    h = g
-    hl = gl
-    g = f
-    gl = fl
-    f = e
-    fl = el
-    el = (dl + t1l) | 0
-    e = (d + t1 + ((el >>> 0) < (dl >>> 0) ? 1 : 0)) | 0
-    d = c
-    dl = cl
-    c = b
-    cl = bl
-    b = a
-    bl = al
-    al = (t1l + t2l) | 0
-    a = (t1 + t2 + ((al >>> 0) < (t1l >>> 0) ? 1 : 0)) | 0
+function encodeStack (signature, pubKey) {
+  typeforce({
+    signature: types.Buffer, pubKey: types.Buffer
+  }, {
+    signature: signature, pubKey: pubKey
+  })
 
-    i++
-    j += 2
-  }
+  return [signature, pubKey]
+}
 
-  while (i < 16) {
-    Wi = M.readInt32BE(j * 4)
-    Wil = M.readInt32BE(j * 4 + 4)
+function encode (signature, pubKey) {
+  return bscript.compile(encodeStack(signature, pubKey))
+}
 
-    loop()
-  }
+function decodeStack (stack) {
+  typeforce(check, stack)
 
-  while (i < 80) {
-    calcW()
-    loop()
+  return {
+    signature: stack[0],
+    pubKey: stack[1]
   }
+}
 
-  this._al = (this._al + al) | 0
-  this._bl = (this._bl + bl) | 0
-  this._cl = (this._cl + cl) | 0
-  this._dl = (this._dl + dl) | 0
-  this._el = (this._el + el) | 0
-  this._fl = (this._fl + fl) | 0
-  this._gl = (this._gl + gl) | 0
-  this._hl = (this._hl + hl) | 0
+function decode (buffer) {
+  var stack = bscript.decompile(buffer)
+  return decodeStack(stack)
+}
 
-  this._a = (this._a + a + ((this._al >>> 0) < (al >>> 0) ? 1 : 0)) | 0
-  this._b = (this._b + b + ((this._bl >>> 0) < (bl >>> 0) ? 1 : 0)) | 0
-  this._c = (this._c + c + ((this._cl >>> 0) < (cl >>> 0) ? 1 : 0)) | 0
-  this._d = (this._d + d + ((this._dl >>> 0) < (dl >>> 0) ? 1 : 0)) | 0
-  this._e = (this._e + e + ((this._el >>> 0) < (el >>> 0) ? 1 : 0)) | 0
-  this._f = (this._f + f + ((this._fl >>> 0) < (fl >>> 0) ? 1 : 0)) | 0
-  this._g = (this._g + g + ((this._gl >>> 0) < (gl >>> 0) ? 1 : 0)) | 0
-  this._h = (this._h + h + ((this._hl >>> 0) < (hl >>> 0) ? 1 : 0)) | 0
+module.exports = {
+  check: check,
+  decode: decode,
+  decodeStack: decodeStack,
+  encode: encode,
+  encodeStack: encodeStack
 }
 
-Sha512.prototype._hash = function () {
-  var H = new Buffer(64)
+},{"../../script":52,"../../types":78,"typeforce":109}],64:[function(require,module,exports){
+// OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
 
-  function writeInt64BE (h, l, offset) {
-    H.writeInt32BE(h, offset)
-    H.writeInt32BE(l, offset + 4)
-  }
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
 
-  writeInt64BE(this._a, this._al, 0)
-  writeInt64BE(this._b, this._bl, 8)
-  writeInt64BE(this._c, this._cl, 16)
-  writeInt64BE(this._d, this._dl, 24)
-  writeInt64BE(this._e, this._el, 32)
-  writeInt64BE(this._f, this._fl, 40)
-  writeInt64BE(this._g, this._gl, 48)
-  writeInt64BE(this._h, this._hl, 56)
+function check (script) {
+  var buffer = bscript.compile(script)
 
-  return H
+  return buffer.length === 25 &&
+    buffer[0] === OPS.OP_DUP &&
+    buffer[1] === OPS.OP_HASH160 &&
+    buffer[2] === 0x14 &&
+    buffer[23] === OPS.OP_EQUALVERIFY &&
+    buffer[24] === OPS.OP_CHECKSIG
 }
+check.toJSON = function () { return 'pubKeyHash output' }
 
-module.exports = Sha512
+function encode (pubKeyHash) {
+  typeforce(types.Hash160bit, pubKeyHash)
 
-}).call(this,require("buffer").Buffer)
-},{"./hash":37,"buffer":7,"inherits":35}],45:[function(require,module,exports){
-(function (Buffer){
-'use strict';
-var createHash = require('create-hash/browser');
-var inherits = require('inherits')
+  return bscript.compile([
+    OPS.OP_DUP,
+    OPS.OP_HASH160,
+    pubKeyHash,
+    OPS.OP_EQUALVERIFY,
+    OPS.OP_CHECKSIG
+  ])
+}
 
-var Transform = require('stream').Transform
+function decode (buffer) {
+  typeforce(check, buffer)
 
-var ZEROS = new Buffer(128)
-ZEROS.fill(0)
+  return buffer.slice(3, 23)
+}
 
-function Hmac(alg, key) {
-  Transform.call(this)
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
 
-  if (typeof key === 'string') {
-    key = new Buffer(key)
-  }
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"typeforce":109}],65:[function(require,module,exports){
+arguments[4][55][0].apply(exports,arguments)
+},{"./input":66,"./output":67,"dup":55}],66:[function(require,module,exports){
+// <scriptSig> {serialized scriptPubKey script}
 
-  var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64
+var Buffer = require('safe-buffer').Buffer
+var bscript = require('../../script')
+var typeforce = require('typeforce')
 
-  this._alg = alg
-  this._key = key
+function check (script, allowIncomplete) {
+  var chunks = bscript.decompile(script)
+  if (chunks.length < 1) return false
 
-  if (key.length > blocksize) {
-    key = createHash(alg).update(key).digest()
+  var lastChunk = chunks[chunks.length - 1]
+  if (!Buffer.isBuffer(lastChunk)) return false
 
-  } else if (key.length < blocksize) {
-    key = Buffer.concat([key, ZEROS], blocksize)
-  }
+  var scriptSigChunks = bscript.decompile(bscript.compile(chunks.slice(0, -1)))
+  var redeemScriptChunks = bscript.decompile(lastChunk)
+
+  // is redeemScript a valid script?
+  if (redeemScriptChunks.length === 0) return false
 
-  var ipad = this._ipad = new Buffer(blocksize)
-  var opad = this._opad = new Buffer(blocksize)
+  // is redeemScriptSig push only?
+  if (!bscript.isPushOnly(scriptSigChunks)) return false
 
-  for (var i = 0; i < blocksize; i++) {
-    ipad[i] = key[i] ^ 0x36
-    opad[i] = key[i] ^ 0x5C
+  var inputType = bscript.classifyInput(scriptSigChunks, allowIncomplete)
+  var outputType = bscript.classifyOutput(redeemScriptChunks)
+  if (chunks.length === 1) {
+    return outputType === bscript.types.P2WSH || outputType === bscript.types.P2WPKH
   }
+  return inputType === outputType
+}
+check.toJSON = function () { return 'scriptHash input' }
+
+function encodeStack (redeemScriptStack, redeemScript) {
+  var serializedScriptPubKey = bscript.compile(redeemScript)
 
-  this._hash = createHash(alg).update(ipad)
+  return [].concat(redeemScriptStack, serializedScriptPubKey)
 }
 
-inherits(Hmac, Transform)
+function encode (redeemScriptSig, redeemScript) {
+  var redeemScriptStack = bscript.decompile(redeemScriptSig)
 
-Hmac.prototype.update = function (data, enc) {
-  this._hash.update(data, enc)
+  return bscript.compile(encodeStack(redeemScriptStack, redeemScript))
+}
 
-  return this
+function decodeStack (stack) {
+  typeforce(check, stack)
+
+  return {
+    redeemScriptStack: stack.slice(0, -1),
+    redeemScript: stack[stack.length - 1]
+  }
 }
 
-Hmac.prototype._transform = function (data, _, next) {
-  this._hash.update(data)
+function decode (buffer) {
+  var stack = bscript.decompile(buffer)
+  var result = decodeStack(stack)
+  result.redeemScriptSig = bscript.compile(result.redeemScriptStack)
+  delete result.redeemScriptStack
+  return result
+}
 
-  next()
+module.exports = {
+  check: check,
+  decode: decode,
+  decodeStack: decodeStack,
+  encode: encode,
+  encodeStack: encodeStack
 }
 
-Hmac.prototype._flush = function (next) {
-  this.push(this.digest())
+},{"../../script":52,"safe-buffer":98,"typeforce":109}],67:[function(require,module,exports){
+// OP_HASH160 {scriptHash} OP_EQUAL
+
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
+
+function check (script) {
+  var buffer = bscript.compile(script)
 
-  next()
+  return buffer.length === 23 &&
+    buffer[0] === OPS.OP_HASH160 &&
+    buffer[1] === 0x14 &&
+    buffer[22] === OPS.OP_EQUAL
 }
+check.toJSON = function () { return 'scriptHash output' }
 
-Hmac.prototype.digest = function (enc) {
-  var h = this._hash.digest()
+function encode (scriptHash) {
+  typeforce(types.Hash160bit, scriptHash)
 
-  return createHash(this._alg).update(this._opad).update(h).digest(enc)
+  return bscript.compile([OPS.OP_HASH160, scriptHash, OPS.OP_EQUAL])
 }
 
-module.exports = function createHmac(alg, key) {
-  return new Hmac(alg, key)
+function decode (buffer) {
+  typeforce(check, buffer)
+
+  return buffer.slice(2, 22)
 }
 
-}).call(this,require("buffer").Buffer)
-},{"buffer":7,"create-hash/browser":32,"inherits":46,"stream":26}],46:[function(require,module,exports){
-arguments[4][12][0].apply(exports,arguments)
-},{"dup":12}],47:[function(require,module,exports){
-var assert = require('assert')
-var BigInteger = require('bigi')
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
 
-var Point = require('./point')
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"typeforce":109}],68:[function(require,module,exports){
+module.exports = {
+  output: require('./output')
+}
 
-function Curve(p, a, b, Gx, Gy, n, h) {
-  this.p = p
-  this.a = a
-  this.b = b
-  this.G = Point.fromAffine(this, Gx, Gy)
-  this.n = n
-  this.h = h
+},{"./output":69}],69:[function(require,module,exports){
+// OP_RETURN {aa21a9ed} {commitment}
 
-  this.infinity = new Point(this, null, null, BigInteger.ZERO)
+var Buffer = require('safe-buffer').Buffer
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
 
-  // result caching
-  this.pOverFour = p.add(BigInteger.ONE).shiftRight(2)
+var HEADER = Buffer.from('aa21a9ed', 'hex')
+
+function check (script) {
+  var buffer = bscript.compile(script)
+
+  return buffer.length > 37 &&
+    buffer[0] === OPS.OP_RETURN &&
+    buffer[1] === 0x24 &&
+    buffer.slice(2, 6).equals(HEADER)
 }
 
-Curve.prototype.pointFromX = function(isOdd, x) {
-  var alpha = x.pow(3).add(this.a.multiply(x)).add(this.b).mod(this.p)
-  var beta = alpha.modPow(this.pOverFour, this.p) // XXX: not compatible with all curves
+check.toJSON = function () { return 'Witness commitment output' }
 
-  var y = beta
-  if (beta.isEven() ^ !isOdd) {
-    y = this.p.subtract(y) // -y % p
-  }
+function encode (commitment) {
+  typeforce(types.Hash256bit, commitment)
 
-  return Point.fromAffine(this, x, y)
+  var buffer = Buffer.allocUnsafe(36)
+  HEADER.copy(buffer, 0)
+  commitment.copy(buffer, 4)
+
+  return bscript.compile([OPS.OP_RETURN, buffer])
 }
 
-Curve.prototype.isInfinity = function(Q) {
-  if (Q === this.infinity) return true
+function decode (buffer) {
+  typeforce(check, buffer)
 
-  return Q.z.signum() === 0 && Q.y.signum() !== 0
+  return bscript.decompile(buffer)[1].slice(4, 36)
 }
 
-Curve.prototype.isOnCurve = function(Q) {
-  if (this.isInfinity(Q)) return true
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
 
-  var x = Q.affineX
-  var y = Q.affineY
-  var a = this.a
-  var b = this.b
-  var p = this.p
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"safe-buffer":98,"typeforce":109}],70:[function(require,module,exports){
+arguments[4][55][0].apply(exports,arguments)
+},{"./input":71,"./output":72,"dup":55}],71:[function(require,module,exports){
+// {signature} {pubKey}
 
-  // Check that xQ and yQ are integers in the interval [0, p - 1]
-  if (x.signum() < 0 || x.compareTo(p) >= 0) return false
-  if (y.signum() < 0 || y.compareTo(p) >= 0) return false
+var pkh = require('../pubkeyhash/input')
 
-  // and check that y^2 = x^3 + ax + b (mod p)
-  var lhs = y.square().mod(p)
-  var rhs = x.pow(3).add(a.multiply(x)).add(b).mod(p)
-  return lhs.equals(rhs)
+module.exports = {
+  check: pkh.check,
+  decodeStack: pkh.decodeStack,
+  encodeStack: pkh.encodeStack
 }
 
-/**
- * Validate an elliptic curve point.
- *
- * See SEC 1, section 3.2.2.1: Elliptic Curve Public Key Validation Primitive
- */
-Curve.prototype.validate = function(Q) {
-  // Check Q != O
-  assert(!this.isInfinity(Q), 'Point is at infinity')
-  assert(this.isOnCurve(Q), 'Point is not on the curve')
+},{"../pubkeyhash/input":63}],72:[function(require,module,exports){
+// OP_0 {pubKeyHash}
 
-  // Check nQ = O (where Q is a scalar multiple of G)
-  var nQ = Q.multiply(this.n)
-  assert(this.isInfinity(nQ), 'Point is not a scalar multiple of G')
-
-  return true
-}
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
 
-module.exports = Curve
+function check (script) {
+  var buffer = bscript.compile(script)
 
-},{"./point":51,"assert":5,"bigi":3}],48:[function(require,module,exports){
-module.exports={
-  "secp128r1": {
-    "p": "fffffffdffffffffffffffffffffffff",
-    "a": "fffffffdfffffffffffffffffffffffc",
-    "b": "e87579c11079f43dd824993c2cee5ed3",
-    "n": "fffffffe0000000075a30d1b9038a115",
-    "h": "01",
-    "Gx": "161ff7528b899b2d0c28607ca52c5b86",
-    "Gy": "cf5ac8395bafeb13c02da292dded7a83"
-  },
-  "secp160k1": {
-    "p": "fffffffffffffffffffffffffffffffeffffac73",
-    "a": "00",
-    "b": "07",
-    "n": "0100000000000000000001b8fa16dfab9aca16b6b3",
-    "h": "01",
-    "Gx": "3b4c382ce37aa192a4019e763036f4f5dd4d7ebb",
-    "Gy": "938cf935318fdced6bc28286531733c3f03c4fee"
-  },
-  "secp160r1": {
-    "p": "ffffffffffffffffffffffffffffffff7fffffff",
-    "a": "ffffffffffffffffffffffffffffffff7ffffffc",
-    "b": "1c97befc54bd7a8b65acf89f81d4d4adc565fa45",
-    "n": "0100000000000000000001f4c8f927aed3ca752257",
-    "h": "01",
-    "Gx": "4a96b5688ef573284664698968c38bb913cbfc82",
-    "Gy": "23a628553168947d59dcc912042351377ac5fb32"
-  },
-  "secp192k1": {
-    "p": "fffffffffffffffffffffffffffffffffffffffeffffee37",
-    "a": "00",
-    "b": "03",
-    "n": "fffffffffffffffffffffffe26f2fc170f69466a74defd8d",
-    "h": "01",
-    "Gx": "db4ff10ec057e9ae26b07d0280b7f4341da5d1b1eae06c7d",
-    "Gy": "9b2f2f6d9c5628a7844163d015be86344082aa88d95e2f9d"
-  },
-  "secp192r1": {
-    "p": "fffffffffffffffffffffffffffffffeffffffffffffffff",
-    "a": "fffffffffffffffffffffffffffffffefffffffffffffffc",
-    "b": "64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1",
-    "n": "ffffffffffffffffffffffff99def836146bc9b1b4d22831",
-    "h": "01",
-    "Gx": "188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012",
-    "Gy": "07192b95ffc8da78631011ed6b24cdd573f977a11e794811"
-  },
-  "secp256k1": {
-    "p": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
-    "a": "00",
-    "b": "07",
-    "n": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
-    "h": "01",
-    "Gx": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
-    "Gy": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
-  },
-  "secp256r1": {
-    "p": "ffffffff00000001000000000000000000000000ffffffffffffffffffffffff",
-    "a": "ffffffff00000001000000000000000000000000fffffffffffffffffffffffc",
-    "b": "5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b",
-    "n": "ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",
-    "h": "01",
-    "Gx": "6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",
-    "Gy": "4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5"
-  }
+  return buffer.length === 22 &&
+    buffer[0] === OPS.OP_0 &&
+    buffer[1] === 0x14
+}
+check.toJSON = function () { return 'Witness pubKeyHash output' }
+
+function encode (pubKeyHash) {
+  typeforce(types.Hash160bit, pubKeyHash)
+
+  return bscript.compile([OPS.OP_0, pubKeyHash])
 }
 
-},{}],49:[function(require,module,exports){
-var Point = require('./point')
-var Curve = require('./curve')
+function decode (buffer) {
+  typeforce(check, buffer)
 
-var getCurveByName = require('./names')
+  return buffer.slice(2)
+}
 
 module.exports = {
-  Curve: Curve,
-  Point: Point,
-  getCurveByName: getCurveByName
+  check: check,
+  decode: decode,
+  encode: encode
 }
 
-},{"./curve":47,"./names":50,"./point":51}],50:[function(require,module,exports){
-var BigInteger = require('bigi')
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"typeforce":109}],73:[function(require,module,exports){
+arguments[4][55][0].apply(exports,arguments)
+},{"./input":74,"./output":75,"dup":55}],74:[function(require,module,exports){
+// {signature} {pubKey}
 
-var curves = require('./curves')
-var Curve = require('./curve')
+var p2sh = require('../scripthash/input')
 
-function getCurveByName(name) {
-  var curve = curves[name]
-  if (!curve) return null
+module.exports = {
+  check: p2sh.check,
+  decodeStack: p2sh.decodeStack,
+  encodeStack: p2sh.encodeStack
+}
 
-  var p = new BigInteger(curve.p, 16)
-  var a = new BigInteger(curve.a, 16)
-  var b = new BigInteger(curve.b, 16)
-  var n = new BigInteger(curve.n, 16)
-  var h = new BigInteger(curve.h, 16)
-  var Gx = new BigInteger(curve.Gx, 16)
-  var Gy = new BigInteger(curve.Gy, 16)
+},{"../scripthash/input":66}],75:[function(require,module,exports){
+// OP_0 {scriptHash}
 
-  return new Curve(p, a, b, Gx, Gy, n, h)
+var bscript = require('../../script')
+var types = require('../../types')
+var typeforce = require('typeforce')
+var OPS = require('bitcoin-ops')
+
+function check (script) {
+  var buffer = bscript.compile(script)
+
+  return buffer.length === 34 &&
+    buffer[0] === OPS.OP_0 &&
+    buffer[1] === 0x20
 }
+check.toJSON = function () { return 'Witness scriptHash output' }
 
-module.exports = getCurveByName
+function encode (scriptHash) {
+  typeforce(types.Hash256bit, scriptHash)
 
-},{"./curve":47,"./curves":48,"bigi":3}],51:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var BigInteger = require('bigi')
+  return bscript.compile([OPS.OP_0, scriptHash])
+}
 
-var THREE = BigInteger.valueOf(3)
+function decode (buffer) {
+  typeforce(check, buffer)
 
-function Point(curve, x, y, z) {
-  assert.notStrictEqual(z, undefined, 'Missing Z coordinate')
+  return buffer.slice(2)
+}
 
-  this.curve = curve
-  this.x = x
-  this.y = y
-  this.z = z
-  this._zInv = null
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
 
-  this.compressed = true
+},{"../../script":52,"../../types":78,"bitcoin-ops":40,"typeforce":109}],76:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var bcrypto = require('./crypto')
+var bscript = require('./script')
+var bufferutils = require('./bufferutils')
+var opcodes = require('bitcoin-ops')
+var typeforce = require('typeforce')
+var types = require('./types')
+var varuint = require('varuint-bitcoin')
+
+function varSliceSize (someScript) {
+  var length = someScript.length
+
+  return varuint.encodingLength(length) + length
 }
 
-Object.defineProperty(Point.prototype, 'zInv', {
-  get: function() {
-    if (this._zInv === null) {
-      this._zInv = this.z.modInverse(this.curve.p)
-    }
+function vectorSize (someVector) {
+  var length = someVector.length
 
-    return this._zInv
-  }
-})
+  return varuint.encodingLength(length) + someVector.reduce(function (sum, witness) {
+    return sum + varSliceSize(witness)
+  }, 0)
+}
 
-Object.defineProperty(Point.prototype, 'affineX', {
-  get: function() {
-    return this.x.multiply(this.zInv).mod(this.curve.p)
-  }
-})
+function Transaction () {
+  this.version = 1
+  this.locktime = 0
+  this.ins = []
+  this.outs = []
+}
 
-Object.defineProperty(Point.prototype, 'affineY', {
-  get: function() {
-    return this.y.multiply(this.zInv).mod(this.curve.p)
-  }
-})
+Transaction.DEFAULT_SEQUENCE = 0xffffffff
+Transaction.SIGHASH_ALL = 0x01
+Transaction.SIGHASH_NONE = 0x02
+Transaction.SIGHASH_SINGLE = 0x03
+Transaction.SIGHASH_ANYONECANPAY = 0x80
+Transaction.ADVANCED_TRANSACTION_MARKER = 0x00
+Transaction.ADVANCED_TRANSACTION_FLAG = 0x01
 
-Point.fromAffine = function(curve, x, y) {
-  return new Point(curve, x, y, BigInteger.ONE)
+var EMPTY_SCRIPT = Buffer.allocUnsafe(0)
+var EMPTY_WITNESS = []
+var ZERO = Buffer.from('0000000000000000000000000000000000000000000000000000000000000000', 'hex')
+var ONE = Buffer.from('0000000000000000000000000000000000000000000000000000000000000001', 'hex')
+var VALUE_UINT64_MAX = Buffer.from('ffffffffffffffff', 'hex')
+var BLANK_OUTPUT = {
+  script: EMPTY_SCRIPT,
+  valueBuffer: VALUE_UINT64_MAX
 }
 
-Point.prototype.equals = function(other) {
-  if (other === this) return true
-  if (this.curve.isInfinity(this)) return this.curve.isInfinity(other)
-  if (this.curve.isInfinity(other)) return this.curve.isInfinity(this)
+Transaction.fromBuffer = function (buffer, __noStrict) {
+  var offset = 0
+  function readSlice (n) {
+    offset += n
+    return buffer.slice(offset - n, offset)
+  }
 
-  // u = Y2 * Z1 - Y1 * Z2
-  var u = other.y.multiply(this.z).subtract(this.y.multiply(other.z)).mod(this.curve.p)
+  function readUInt32 () {
+    var i = buffer.readUInt32LE(offset)
+    offset += 4
+    return i
+  }
 
-  if (u.signum() !== 0) return false
+  function readInt32 () {
+    var i = buffer.readInt32LE(offset)
+    offset += 4
+    return i
+  }
 
-  // v = X2 * Z1 - X1 * Z2
-  var v = other.x.multiply(this.z).subtract(this.x.multiply(other.z)).mod(this.curve.p)
+  function readUInt64 () {
+    var i = bufferutils.readUInt64LE(buffer, offset)
+    offset += 8
+    return i
+  }
 
-  return v.signum() === 0
-}
+  function readVarInt () {
+    var vi = varuint.decode(buffer, offset)
+    offset += varuint.decode.bytes
+    return vi
+  }
 
-Point.prototype.negate = function() {
-  var y = this.curve.p.subtract(this.y)
+  function readVarSlice () {
+    return readSlice(readVarInt())
+  }
 
-  return new Point(this.curve, this.x, y, this.z)
-}
+  function readVector () {
+    var count = readVarInt()
+    var vector = []
+    for (var i = 0; i < count; i++) vector.push(readVarSlice())
+    return vector
+  }
 
-Point.prototype.add = function(b) {
-  if (this.curve.isInfinity(this)) return b
-  if (this.curve.isInfinity(b)) return this
+  var tx = new Transaction()
+  tx.version = readInt32()
 
-  var x1 = this.x
-  var y1 = this.y
-  var x2 = b.x
-  var y2 = b.y
+  var marker = buffer.readUInt8(offset)
+  var flag = buffer.readUInt8(offset + 1)
 
-  // u = Y2 * Z1 - Y1 * Z2
-  var u = y2.multiply(this.z).subtract(y1.multiply(b.z)).mod(this.curve.p)
-  // v = X2 * Z1 - X1 * Z2
-  var v = x2.multiply(this.z).subtract(x1.multiply(b.z)).mod(this.curve.p)
+  var hasWitnesses = false
+  if (marker === Transaction.ADVANCED_TRANSACTION_MARKER &&
+      flag === Transaction.ADVANCED_TRANSACTION_FLAG) {
+    offset += 2
+    hasWitnesses = true
+  }
 
-  if (v.signum() === 0) {
-    if (u.signum() === 0) {
-      return this.twice() // this == b, so double
+  var vinLen = readVarInt()
+  for (var i = 0; i < vinLen; ++i) {
+    tx.ins.push({
+      hash: readSlice(32),
+      index: readUInt32(),
+      script: readVarSlice(),
+      sequence: readUInt32(),
+      witness: EMPTY_WITNESS
+    })
+  }
+
+  var voutLen = readVarInt()
+  for (i = 0; i < voutLen; ++i) {
+    tx.outs.push({
+      value: readUInt64(),
+      script: readVarSlice()
+    })
+  }
+
+  if (hasWitnesses) {
+    for (i = 0; i < vinLen; ++i) {
+      tx.ins[i].witness = readVector()
     }
 
-    return this.curve.infinity // this = -b, so infinity
+    // was this pointless?
+    if (!tx.hasWitnesses()) throw new Error('Transaction has superfluous witness data')
   }
 
-  var v2 = v.square()
-  var v3 = v2.multiply(v)
-  var x1v2 = x1.multiply(v2)
-  var zu2 = u.square().multiply(this.z)
+  tx.locktime = readUInt32()
 
-  // x3 = v * (z2 * (z1 * u^2 - 2 * x1 * v^2) - v^3)
-  var x3 = zu2.subtract(x1v2.shiftLeft(1)).multiply(b.z).subtract(v3).multiply(v).mod(this.curve.p)
-  // y3 = z2 * (3 * x1 * u * v^2 - y1 * v^3 - z1 * u^3) + u * v^3
-  var y3 = x1v2.multiply(THREE).multiply(u).subtract(y1.multiply(v3)).subtract(zu2.multiply(u)).multiply(b.z).add(u.multiply(v3)).mod(this.curve.p)
-  // z3 = v^3 * z1 * z2
-  var z3 = v3.multiply(this.z).multiply(b.z).mod(this.curve.p)
+  if (__noStrict) return tx
+  if (offset !== buffer.length) throw new Error('Transaction has unexpected data')
 
-  return new Point(this.curve, x3, y3, z3)
+  return tx
 }
 
-Point.prototype.twice = function() {
-  if (this.curve.isInfinity(this)) return this
-  if (this.y.signum() === 0) return this.curve.infinity
+Transaction.fromHex = function (hex) {
+  return Transaction.fromBuffer(Buffer.from(hex, 'hex'))
+}
 
-  var x1 = this.x
-  var y1 = this.y
+Transaction.isCoinbaseHash = function (buffer) {
+  typeforce(types.Hash256bit, buffer)
+  for (var i = 0; i < 32; ++i) {
+    if (buffer[i] !== 0) return false
+  }
+  return true
+}
 
-  var y1z1 = y1.multiply(this.z)
-  var y1sqz1 = y1z1.multiply(y1).mod(this.curve.p)
-  var a = this.curve.a
+Transaction.prototype.isCoinbase = function () {
+  return this.ins.length === 1 && Transaction.isCoinbaseHash(this.ins[0].hash)
+}
 
-  // w = 3 * x1^2 + a * z1^2
-  var w = x1.square().multiply(THREE)
+Transaction.prototype.addInput = function (hash, index, sequence, scriptSig) {
+  typeforce(types.tuple(
+    types.Hash256bit,
+    types.UInt32,
+    types.maybe(types.UInt32),
+    types.maybe(types.Buffer)
+  ), arguments)
 
-  if (a.signum() !== 0) {
-    w = w.add(this.z.square().multiply(a))
+  if (types.Null(sequence)) {
+    sequence = Transaction.DEFAULT_SEQUENCE
   }
 
-  w = w.mod(this.curve.p)
-  // x3 = 2 * y1 * z1 * (w^2 - 8 * x1 * y1^2 * z1)
-  var x3 = w.square().subtract(x1.shiftLeft(3).multiply(y1sqz1)).shiftLeft(1).multiply(y1z1).mod(this.curve.p)
-  // y3 = 4 * y1^2 * z1 * (3 * w * x1 - 2 * y1^2 * z1) - w^3
-  var y3 = w.multiply(THREE).multiply(x1).subtract(y1sqz1.shiftLeft(1)).shiftLeft(2).multiply(y1sqz1).subtract(w.pow(3)).mod(this.curve.p)
-  // z3 = 8 * (y1 * z1)^3
-  var z3 = y1z1.pow(3).shiftLeft(3).mod(this.curve.p)
+  // Add the input and return the input's index
+  return (this.ins.push({
+    hash: hash,
+    index: index,
+    script: scriptSig || EMPTY_SCRIPT,
+    sequence: sequence,
+    witness: EMPTY_WITNESS
+  }) - 1)
+}
 
-  return new Point(this.curve, x3, y3, z3)
+Transaction.prototype.addOutput = function (scriptPubKey, value) {
+  typeforce(types.tuple(types.Buffer, types.Satoshi), arguments)
+
+  // Add the output and return the output's index
+  return (this.outs.push({
+    script: scriptPubKey,
+    value: value
+  }) - 1)
 }
 
-// Simple NAF (Non-Adjacent Form) multiplication algorithm
-// TODO: modularize the multiplication algorithm
-Point.prototype.multiply = function(k) {
-  if (this.curve.isInfinity(this)) return this
-  if (k.signum() === 0) return this.curve.infinity
+Transaction.prototype.hasWitnesses = function () {
+  return this.ins.some(function (x) {
+    return x.witness.length !== 0
+  })
+}
 
-  var e = k
-  var h = e.multiply(THREE)
+Transaction.prototype.weight = function () {
+  var base = this.__byteLength(false)
+  var total = this.__byteLength(true)
+  return base * 3 + total
+}
 
-  var neg = this.negate()
-  var R = this
+Transaction.prototype.virtualSize = function () {
+  return Math.ceil(this.weight() / 4)
+}
 
-  for (var i = h.bitLength() - 2; i > 0; --i) {
-    R = R.twice()
+Transaction.prototype.byteLength = function () {
+  return this.__byteLength(true)
+}
 
-    var hBit = h.testBit(i)
-    var eBit = e.testBit(i)
+Transaction.prototype.__byteLength = function (__allowWitness) {
+  var hasWitnesses = __allowWitness && this.hasWitnesses()
 
-    if (hBit != eBit) {
-      R = R.add(hBit ? this : neg)
+  return (
+    (hasWitnesses ? 10 : 8) +
+    varuint.encodingLength(this.ins.length) +
+    varuint.encodingLength(this.outs.length) +
+    this.ins.reduce(function (sum, input) { return sum + 40 + varSliceSize(input.script) }, 0) +
+    this.outs.reduce(function (sum, output) { return sum + 8 + varSliceSize(output.script) }, 0) +
+    (hasWitnesses ? this.ins.reduce(function (sum, input) { return sum + vectorSize(input.witness) }, 0) : 0)
+  )
+}
+
+Transaction.prototype.clone = function () {
+  var newTx = new Transaction()
+  newTx.version = this.version
+  newTx.locktime = this.locktime
+
+  newTx.ins = this.ins.map(function (txIn) {
+    return {
+      hash: txIn.hash,
+      index: txIn.index,
+      script: txIn.script,
+      sequence: txIn.sequence,
+      witness: txIn.witness
     }
-  }
+  })
 
-  return R
+  newTx.outs = this.outs.map(function (txOut) {
+    return {
+      script: txOut.script,
+      value: txOut.value
+    }
+  })
+
+  return newTx
 }
 
-// Compute this*j + x*k (simultaneous multiplication)
-Point.prototype.multiplyTwo = function(j, x, k) {
-  var i
+/**
+ * Hash transaction for signing a specific input.
+ *
+ * Bitcoin uses a different hash for each signed transaction input.
+ * This method copies the transaction, makes the necessary changes based on the
+ * hashType, and then hashes the result.
+ * This hash can then be used to sign the provided transaction input.
+ */
+Transaction.prototype.hashForSignature = function (inIndex, prevOutScript, hashType) {
+  typeforce(types.tuple(types.UInt32, types.Buffer, /* types.UInt8 */ types.Number), arguments)
 
-  if (j.bitLength() > k.bitLength())
-    i = j.bitLength() - 1
-  else
-    i = k.bitLength() - 1
+  // https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L29
+  if (inIndex >= this.ins.length) return ONE
 
-  var R = this.curve.infinity
-  var both = this.add(x)
+  // ignore OP_CODESEPARATOR
+  var ourScript = bscript.compile(bscript.decompile(prevOutScript).filter(function (x) {
+    return x !== opcodes.OP_CODESEPARATOR
+  }))
 
-  while (i >= 0) {
-    R = R.twice()
+  var txTmp = this.clone()
 
-    var jBit = j.testBit(i)
-    var kBit = k.testBit(i)
+  // SIGHASH_NONE: ignore all outputs? (wildcard payee)
+  if ((hashType & 0x1f) === Transaction.SIGHASH_NONE) {
+    txTmp.outs = []
 
-    if (jBit) {
-      if (kBit) {
-        R = R.add(both)
+    // ignore sequence numbers (except at inIndex)
+    txTmp.ins.forEach(function (input, i) {
+      if (i === inIndex) return
 
-      } else {
-        R = R.add(this)
-      }
+      input.sequence = 0
+    })
 
-    } else {
-      if (kBit) {
-        R = R.add(x)
-      }
+  // SIGHASH_SINGLE: ignore all outputs, except at the same index?
+  } else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE) {
+    // https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L60
+    if (inIndex >= this.outs.length) return ONE
+
+    // truncate outputs after
+    txTmp.outs.length = inIndex + 1
+
+    // "blank" outputs before
+    for (var i = 0; i < inIndex; i++) {
+      txTmp.outs[i] = BLANK_OUTPUT
     }
-    --i
+
+    // ignore sequence numbers (except at inIndex)
+    txTmp.ins.forEach(function (input, y) {
+      if (y === inIndex) return
+
+      input.sequence = 0
+    })
   }
 
-  return R
-}
+  // SIGHASH_ANYONECANPAY: ignore inputs entirely?
+  if (hashType & Transaction.SIGHASH_ANYONECANPAY) {
+    txTmp.ins = [txTmp.ins[inIndex]]
+    txTmp.ins[0].script = ourScript
 
-Point.prototype.getEncoded = function(compressed) {
-  if (compressed == undefined) compressed = this.compressed
-  if (this.curve.isInfinity(this)) return new Buffer('00', 'hex') // Infinity point encoded is simply '00'
+  // SIGHASH_ALL: only ignore input scripts
+  } else {
+    // "blank" others input scripts
+    txTmp.ins.forEach(function (input) { input.script = EMPTY_SCRIPT })
+    txTmp.ins[inIndex].script = ourScript
+  }
 
-  var x = this.affineX
-  var y = this.affineY
+  // serialize and hash
+  var buffer = Buffer.allocUnsafe(txTmp.__byteLength(false) + 4)
+  buffer.writeInt32LE(hashType, buffer.length - 4)
+  txTmp.__toBuffer(buffer, 0, false)
 
-  var buffer
+  return bcrypto.hash256(buffer)
+}
 
-  // Determine size of q in bytes
-  var byteLength = Math.floor((this.curve.p.bitLength() + 7) / 8)
+Transaction.prototype.hashForWitnessV0 = function (inIndex, prevOutScript, value, hashType) {
+  typeforce(types.tuple(types.UInt32, types.Buffer, types.Satoshi, types.UInt32), arguments)
 
-  // 0x02/0x03 | X
-  if (compressed) {
-    buffer = new Buffer(1 + byteLength)
-    buffer.writeUInt8(y.isEven() ? 0x02 : 0x03, 0)
+  var tbuffer, toffset
+  function writeSlice (slice) { toffset += slice.copy(tbuffer, toffset) }
+  function writeUInt32 (i) { toffset = tbuffer.writeUInt32LE(i, toffset) }
+  function writeUInt64 (i) { toffset = bufferutils.writeUInt64LE(tbuffer, i, toffset) }
+  function writeVarInt (i) {
+    varuint.encode(i, tbuffer, toffset)
+    toffset += varuint.encode.bytes
+  }
+  function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
 
-  // 0x04 | X | Y
-  } else {
-    buffer = new Buffer(1 + byteLength + byteLength)
-    buffer.writeUInt8(0x04, 0)
+  var hashOutputs = ZERO
+  var hashPrevouts = ZERO
+  var hashSequence = ZERO
 
-    y.toBuffer(byteLength).copy(buffer, 1 + byteLength)
+  if (!(hashType & Transaction.SIGHASH_ANYONECANPAY)) {
+    tbuffer = Buffer.allocUnsafe(36 * this.ins.length)
+    toffset = 0
+
+    this.ins.forEach(function (txIn) {
+      writeSlice(txIn.hash)
+      writeUInt32(txIn.index)
+    })
+
+    hashPrevouts = bcrypto.hash256(tbuffer)
   }
 
-  x.toBuffer(byteLength).copy(buffer, 1)
+  if (!(hashType & Transaction.SIGHASH_ANYONECANPAY) &&
+       (hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
+       (hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
+    tbuffer = Buffer.allocUnsafe(4 * this.ins.length)
+    toffset = 0
 
-  return buffer
-}
+    this.ins.forEach(function (txIn) {
+      writeUInt32(txIn.sequence)
+    })
 
-Point.decodeFrom = function(curve, buffer) {
-  var type = buffer.readUInt8(0)
-  var compressed = (type !== 4)
+    hashSequence = bcrypto.hash256(tbuffer)
+  }
 
-  var byteLength = Math.floor((curve.p.bitLength() + 7) / 8)
-  var x = BigInteger.fromBuffer(buffer.slice(1, 1 + byteLength))
+  if ((hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
+      (hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
+    var txOutsSize = this.outs.reduce(function (sum, output) {
+      return sum + 8 + varSliceSize(output.script)
+    }, 0)
 
-  var Q
-  if (compressed) {
-    assert.equal(buffer.length, byteLength + 1, 'Invalid sequence length')
-    assert(type === 0x02 || type === 0x03, 'Invalid sequence tag')
+    tbuffer = Buffer.allocUnsafe(txOutsSize)
+    toffset = 0
 
-    var isOdd = (type === 0x03)
-    Q = curve.pointFromX(isOdd, x)
+    this.outs.forEach(function (out) {
+      writeUInt64(out.value)
+      writeVarSlice(out.script)
+    })
 
-  } else {
-    assert.equal(buffer.length, 1 + byteLength + byteLength, 'Invalid sequence length')
+    hashOutputs = bcrypto.hash256(tbuffer)
+  } else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE && inIndex < this.outs.length) {
+    var output = this.outs[inIndex]
 
-    var y = BigInteger.fromBuffer(buffer.slice(1 + byteLength))
-    Q = Point.fromAffine(curve, x, y)
+    tbuffer = Buffer.allocUnsafe(8 + varSliceSize(output.script))
+    toffset = 0
+    writeUInt64(output.value)
+    writeVarSlice(output.script)
+
+    hashOutputs = bcrypto.hash256(tbuffer)
   }
 
-  Q.compressed = compressed
-  return Q
+  tbuffer = Buffer.allocUnsafe(156 + varSliceSize(prevOutScript))
+  toffset = 0
+
+  var input = this.ins[inIndex]
+  writeUInt32(this.version)
+  writeSlice(hashPrevouts)
+  writeSlice(hashSequence)
+  writeSlice(input.hash)
+  writeUInt32(input.index)
+  writeVarSlice(prevOutScript)
+  writeUInt64(value)
+  writeUInt32(input.sequence)
+  writeSlice(hashOutputs)
+  writeUInt32(this.locktime)
+  writeUInt32(hashType)
+  return bcrypto.hash256(tbuffer)
 }
 
-Point.prototype.toString = function () {
-  if (this.curve.isInfinity(this)) return '(INFINITY)'
+Transaction.prototype.getHash = function () {
+  return bcrypto.hash256(this.__toBuffer(undefined, undefined, false))
+}
 
-  return '(' + this.affineX.toString() + ',' + this.affineY.toString() + ')'
+Transaction.prototype.getId = function () {
+  // transaction hash's are displayed in reverse order
+  return this.getHash().reverse().toString('hex')
 }
 
-module.exports = Point
+Transaction.prototype.toBuffer = function (buffer, initialOffset) {
+  return this.__toBuffer(buffer, initialOffset, true)
+}
 
-}).call(this,require("buffer").Buffer)
-},{"assert":5,"bigi":3,"buffer":7}],52:[function(require,module,exports){
-(function (process,global,Buffer){
-'use strict';
+Transaction.prototype.__toBuffer = function (buffer, initialOffset, __allowWitness) {
+  if (!buffer) buffer = Buffer.allocUnsafe(this.__byteLength(__allowWitness))
 
-var crypto = global.crypto || global.msCrypto
-if(crypto && crypto.getRandomValues) {
-  module.exports = randomBytes;
-} else {
-  module.exports = oldBrowser;
-}
-function randomBytes(size, cb) {
-  var bytes = new Buffer(size); //in browserify, this is an extended Uint8Array
-    /* This will not work in older browsers.
-     * See https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues
-     */
+  var offset = initialOffset || 0
+  function writeSlice (slice) { offset += slice.copy(buffer, offset) }
+  function writeUInt8 (i) { offset = buffer.writeUInt8(i, offset) }
+  function writeUInt32 (i) { offset = buffer.writeUInt32LE(i, offset) }
+  function writeInt32 (i) { offset = buffer.writeInt32LE(i, offset) }
+  function writeUInt64 (i) { offset = bufferutils.writeUInt64LE(buffer, i, offset) }
+  function writeVarInt (i) {
+    varuint.encode(i, buffer, offset)
+    offset += varuint.encode.bytes
+  }
+  function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
+  function writeVector (vector) { writeVarInt(vector.length); vector.forEach(writeVarSlice) }
 
-  crypto.getRandomValues(bytes);
-  if (typeof cb === 'function') {
-    return process.nextTick(function () {
-      cb(null, bytes);
-    });
+  writeInt32(this.version)
+
+  var hasWitnesses = __allowWitness && this.hasWitnesses()
+
+  if (hasWitnesses) {
+    writeUInt8(Transaction.ADVANCED_TRANSACTION_MARKER)
+    writeUInt8(Transaction.ADVANCED_TRANSACTION_FLAG)
   }
-  return bytes;
-}
-function oldBrowser() {
-  throw new Error(
-      'secure random number generation not supported by this browser\n'+
-      'use chrome, FireFox or Internet Explorer 11'
-    )
-}
 
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
-},{"_process":14,"buffer":7}],53:[function(require,module,exports){
-(function (Buffer){
-'use strict';
+  writeVarInt(this.ins.length)
 
-function getFunctionName(fn) {
-  return fn.name || fn.toString().match(/function (.*?)\s*\(/)[1];
-}
+  this.ins.forEach(function (txIn) {
+    writeSlice(txIn.hash)
+    writeUInt32(txIn.index)
+    writeVarSlice(txIn.script)
+    writeUInt32(txIn.sequence)
+  })
+
+  writeVarInt(this.outs.length)
+  this.outs.forEach(function (txOut) {
+    if (!txOut.valueBuffer) {
+      writeUInt64(txOut.value)
+    } else {
+      writeSlice(txOut.valueBuffer)
+    }
+
+    writeVarSlice(txOut.script)
+  })
 
-function getTypeTypeName(type) {
-  if (nativeTypes.Function(type)) {
-    type = type.toJSON ? type.toJSON() : getFunctionName(type);
+  if (hasWitnesses) {
+    this.ins.forEach(function (input) {
+      writeVector(input.witness)
+    })
   }
-  if (nativeTypes.Object(type)) return JSON.stringify(type);
 
-  return type;
+  writeUInt32(this.locktime)
+
+  // avoid slicing unless necessary
+  if (initialOffset !== undefined) return buffer.slice(initialOffset, offset)
+  return buffer
+}
+
+Transaction.prototype.toHex = function () {
+  return this.toBuffer().toString('hex')
 }
 
-function getValueTypeName(value) {
-  if (nativeTypes.Null(value)) return '';
+Transaction.prototype.setInputScript = function (index, scriptSig) {
+  typeforce(types.tuple(types.Number, types.Buffer), arguments)
 
-  return getFunctionName(value.constructor);
+  this.ins[index].script = scriptSig
 }
 
-function tfErrorString(type, value) {
-  var typeTypeName = getTypeTypeName(type);
-  var valueTypeName = getValueTypeName(value);
+Transaction.prototype.setWitness = function (index, witness) {
+  typeforce(types.tuple(types.Number, [types.Buffer]), arguments)
 
-  return 'Expected ' + typeTypeName + ', got ' + (valueTypeName && valueTypeName + ' ') + JSON.stringify(value);
+  this.ins[index].witness = witness
 }
 
-function tfPropertyErrorString(type, name, value) {
-  return tfErrorString('property \"' + name + '\" of type ' + getTypeTypeName(type), value);
+module.exports = Transaction
+
+},{"./bufferutils":44,"./crypto":45,"./script":52,"./types":78,"bitcoin-ops":40,"safe-buffer":98,"typeforce":109,"varuint-bitcoin":111}],77:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var baddress = require('./address')
+var bcrypto = require('./crypto')
+var bscript = require('./script')
+var networks = require('./networks')
+var ops = require('bitcoin-ops')
+var typeforce = require('typeforce')
+var types = require('./types')
+var scriptTypes = bscript.types
+var SIGNABLE = [bscript.types.P2PKH, bscript.types.P2PK, bscript.types.MULTISIG]
+var P2SH = SIGNABLE.concat([bscript.types.P2WPKH, bscript.types.P2WSH])
+
+var ECPair = require('./ecpair')
+var ECSignature = require('./ecsignature')
+var Transaction = require('./transaction')
+
+function extractChunks (type, chunks, script) {
+  var pubKeys = []
+  var signatures = []
+  switch (type) {
+    case scriptTypes.P2PKH:
+      // if (redeemScript) throw new Error('Nonstandard... P2SH(P2PKH)')
+      pubKeys = chunks.slice(1)
+      signatures = chunks.slice(0, 1)
+      break
+
+    case scriptTypes.P2PK:
+      pubKeys[0] = script ? bscript.pubKey.output.decode(script) : undefined
+      signatures = chunks.slice(0, 1)
+      break
+
+    case scriptTypes.MULTISIG:
+      if (script) {
+        var multisig = bscript.multisig.output.decode(script)
+        pubKeys = multisig.pubKeys
+      }
+
+      signatures = chunks.slice(1).map(function (chunk) {
+        return chunk.length === 0 ? undefined : chunk
+      })
+      break
+  }
+
+  return {
+    pubKeys: pubKeys,
+    signatures: signatures
+  }
 }
+function expandInput (scriptSig, witnessStack) {
+  if (scriptSig.length === 0 && witnessStack.length === 0) return {}
 
-var nativeTypes = {
-  Array: (function (_Array) {
-    function Array(_x) {
-      return _Array.apply(this, arguments);
+  var prevOutScript
+  var prevOutType
+  var scriptType
+  var script
+  var redeemScript
+  var witnessScript
+  var witnessScriptType
+  var redeemScriptType
+  var witness = false
+  var p2wsh = false
+  var p2sh = false
+  var witnessProgram
+  var chunks
+
+  var scriptSigChunks = bscript.decompile(scriptSig)
+  var sigType = bscript.classifyInput(scriptSigChunks, true)
+  if (sigType === scriptTypes.P2SH) {
+    p2sh = true
+    redeemScript = scriptSigChunks[scriptSigChunks.length - 1]
+    redeemScriptType = bscript.classifyOutput(redeemScript)
+    prevOutScript = bscript.scriptHash.output.encode(bcrypto.hash160(redeemScript))
+    prevOutType = scriptTypes.P2SH
+    script = redeemScript
+  }
+
+  var classifyWitness = bscript.classifyWitness(witnessStack)
+  if (classifyWitness === scriptTypes.P2WSH) {
+    witnessScript = witnessStack[witnessStack.length - 1]
+    witnessScriptType = bscript.classifyOutput(witnessScript)
+    p2wsh = true
+    if (scriptSig.length === 0) {
+      prevOutScript = bscript.witnessScriptHash.output.encode(bcrypto.sha256(witnessScript))
+      prevOutType = scriptTypes.P2WSH
+      if (typeof redeemScript !== 'undefined') {
+        throw new Error('Redeem script given when unnecessary')
+      }
+      // bare witness
+    } else {
+      if (!redeemScript) {
+        throw new Error('No redeemScript provided for P2WSH, but scriptSig non-empty')
+      }
+      witnessProgram = bscript.witnessScriptHash.output.encode(bcrypto.sha256(witnessScript))
+      if (!redeemScript.equals(witnessProgram)) {
+        throw new Error('Redeem script didn\'t match witnessScript')
+      }
     }
 
-    Array.toString = function () {
-      return _Array.toString();
-    };
+    if (SIGNABLE.indexOf(bscript.classifyOutput(witnessScript)) === -1) {
+      throw new Error('unsupported witness script')
+    }
+    script = witnessScript
+    scriptType = witnessScriptType
+    chunks = witnessStack.slice(0, -1)
+  } else if (classifyWitness === scriptTypes.P2WPKH) {
+    var key = witnessStack[witnessStack.length - 1]
+    var keyHash = bcrypto.hash160(key)
+    if (scriptSig.length === 0) {
+      prevOutScript = bscript.witnessPubKeyHash.output.encode(keyHash)
+      prevOutType = scriptTypes.P2WPKH
+      if (typeof redeemScript !== 'undefined') {
+        throw new Error('Redeem script given when unnecessary')
+      }
+    } else {
+      if (!redeemScript) {
+        throw new Error('No redeemScript provided for P2WPKH, but scriptSig wasn\'t empty')
+      }
+      witnessProgram = bscript.witnessPubKeyHash.output.encode(keyHash)
+      if (!redeemScript.equals(witnessProgram)) {
+        throw new Error('Redeem script did not have the right witness program')
+      }
+    }
 
-    return Array;
-  })(function (value) {
-    return value !== null && value !== undefined && value.constructor === Array;
-  }),
-  Boolean: function Boolean(value) {
-    return typeof value === 'boolean';
-  },
-  Buffer: (function (_Buffer) {
-    function Buffer(_x2) {
-      return _Buffer.apply(this, arguments);
+    scriptType = scriptTypes.P2PKH
+    chunks = witnessStack
+  } else if (redeemScript) {
+    if (P2SH.indexOf(redeemScriptType) === -1) {
+      throw new Error('Bad redeemscript!')
     }
 
-    Buffer.toString = function () {
-      return _Buffer.toString();
-    };
+    script = redeemScript
+    scriptType = redeemScriptType
+    chunks = scriptSigChunks.slice(0, -1)
+  } else {
+    prevOutType = scriptType = bscript.classifyInput(scriptSig)
+    chunks = scriptSigChunks
+  }
 
-    return Buffer;
-  })(function (value) {
-    return Buffer.isBuffer(value);
-  }),
-  Function: function Function(value) {
-    return typeof value === 'function';
-  },
-  Null: function Null(value) {
-    return value === undefined || value === null;
-  },
-  Number: function Number(value) {
-    return typeof value === 'number';
-  },
-  Object: function Object(value) {
-    return typeof value === 'object';
-  },
-  String: function String(value) {
-    return typeof value === 'string';
-  },
-  '': function _() {
-    return true;
+  var expanded = extractChunks(scriptType, chunks, script)
+
+  var result = {
+    pubKeys: expanded.pubKeys,
+    signatures: expanded.signatures,
+    prevOutScript: prevOutScript,
+    prevOutType: prevOutType,
+    signType: scriptType,
+    signScript: script,
+    witness: Boolean(witness)
+  }
+
+  if (p2sh) {
+    result.redeemScript = redeemScript
+    result.redeemScriptType = redeemScriptType
+  }
+
+  if (p2wsh) {
+    result.witnessScript = witnessScript
+    result.witnessScriptType = witnessScriptType
   }
-};
 
-function tJSON(type) {
-  return type && type.toJSON ? type.toJSON() : type;
+  return result
 }
 
-function sJSON(type) {
-  var json = tJSON(type);
-  return nativeTypes.Object(json) ? JSON.stringify(json) : json;
+// could be done in expandInput, but requires the original Transaction for hashForSignature
+function fixMultisigOrder (input, transaction, vin) {
+  if (input.redeemScriptType !== scriptTypes.MULTISIG || !input.redeemScript) return
+  if (input.pubKeys.length === input.signatures.length) return
+
+  var unmatched = input.signatures.concat()
+
+  input.signatures = input.pubKeys.map(function (pubKey) {
+    var keyPair = ECPair.fromPublicKeyBuffer(pubKey)
+    var match
+
+    // check for a signature
+    unmatched.some(function (signature, i) {
+      // skip if undefined || OP_0
+      if (!signature) return false
+
+      // TODO: avoid O(n) hashForSignature
+      var parsed = ECSignature.parseScriptSignature(signature)
+      var hash = transaction.hashForSignature(vin, input.redeemScript, parsed.hashType)
+
+      // skip if signature does not match pubKey
+      if (!keyPair.verify(hash, parsed.signature)) return false
+
+      // remove matched signature from unmatched
+      unmatched[i] = undefined
+      match = signature
+
+      return true
+    })
+
+    return match
+  })
 }
 
-var otherTypes = {
-  arrayOf: function arrayOf(type) {
-    function arrayOf(value, strict) {
-      try {
-        return nativeTypes.Array(value) && value.every(function (x) {
-          return typeforce(type, x, strict);
-        });
-      } catch (e) {
-        return false;
-      }
-    }
-    arrayOf.toJSON = function () {
-      return [tJSON(type)];
-    };
+function expandOutput (script, scriptType, ourPubKey) {
+  typeforce(types.Buffer, script)
 
-    return arrayOf;
-  },
+  var scriptChunks = bscript.decompile(script)
+  if (!scriptType) {
+    scriptType = bscript.classifyOutput(script)
+  }
 
-  maybe: function maybe(type) {
-    function maybe(value, strict) {
-      return nativeTypes.Null(value) || typeforce(type, value, strict);
-    }
-    maybe.toJSON = function () {
-      return '?' + sJSON(type);
-    };
+  var pubKeys = []
 
-    return maybe;
-  },
+  switch (scriptType) {
+    // does our hash160(pubKey) match the output scripts?
+    case scriptTypes.P2PKH:
+      if (!ourPubKey) break
 
-  object: function object(type) {
-    function object(value, strict) {
-      typeforce(nativeTypes.Object, value, strict);
+      var pkh1 = scriptChunks[2]
+      var pkh2 = bcrypto.hash160(ourPubKey)
+      if (pkh1.equals(pkh2)) pubKeys = [ourPubKey]
+      break
 
-      var propertyName, propertyType, propertyValue;
+    // does our hash160(pubKey) match the output scripts?
+    case scriptTypes.P2WPKH:
+      if (!ourPubKey) break
 
-      try {
-        for (propertyName in type) {
-          propertyType = type[propertyName];
-          propertyValue = value[propertyName];
+      var wpkh1 = scriptChunks[1]
+      var wpkh2 = bcrypto.hash160(ourPubKey)
+      if (wpkh1.equals(wpkh2)) pubKeys = [ourPubKey]
+      break
 
-          typeforce(propertyType, propertyValue, strict);
-        }
-      } catch (e) {
-        throw new TypeError(tfPropertyErrorString(propertyType, propertyName, propertyValue));
-      }
+    case scriptTypes.P2PK:
+      pubKeys = scriptChunks.slice(0, 1)
+      break
 
-      if (strict) {
-        for (propertyName in value) {
-          if (type[propertyName]) continue;
+    case scriptTypes.MULTISIG:
+      pubKeys = scriptChunks.slice(1, -2)
+      break
 
-          throw new TypeError('Unexpected property "' + propertyName + '"');
-        }
-      }
+    default: return { scriptType: scriptType }
+  }
 
-      return true;
-    }
-    object.toJSON = function () {
-      return type;
-    };
+  return {
+    pubKeys: pubKeys,
+    scriptType: scriptType,
+    signatures: pubKeys.map(function () { return undefined })
+  }
+}
 
-    return object;
-  },
+function checkP2shInput (input, redeemScriptHash) {
+  if (input.prevOutType) {
+    if (input.prevOutType !== scriptTypes.P2SH) throw new Error('PrevOutScript must be P2SH')
 
-  oneOf: function oneOf() {
-    for (var _len = arguments.length, types = Array(_len), _key = 0; _key < _len; _key++) {
-      types[_key] = arguments[_key];
-    }
+    var prevOutScriptScriptHash = bscript.decompile(input.prevOutScript)[1]
+    if (!prevOutScriptScriptHash.equals(redeemScriptHash)) throw new Error('Inconsistent hash160(RedeemScript)')
+  }
+}
 
-    function oneOf(value, strict) {
-      return types.some(function (type) {
-        try {
-          return typeforce(type, value, strict);
-        } catch (e) {
-          return false;
-        }
-      });
-    }
-    oneOf.toJSON = function () {
-      return types.map(sJSON).join('|');
-    };
+function checkP2WSHInput (input, witnessScriptHash) {
+  if (input.prevOutType) {
+    if (input.prevOutType !== scriptTypes.P2WSH) throw new Error('PrevOutScript must be P2WSH')
 
-    return oneOf;
-  },
+    var scriptHash = bscript.decompile(input.prevOutScript)[1]
+    if (!scriptHash.equals(witnessScriptHash)) throw new Error('Inconsistent sha25(WitnessScript)')
+  }
+}
 
-  quacksLike: function quacksLike(type) {
-    function quacksLike(value, strict) {
-      return type === getValueTypeName(value);
-    }
-    quacksLike.toJSON = function () {
-      return type;
-    };
+function prepareInput (input, kpPubKey, redeemScript, witnessValue, witnessScript) {
+  var expanded
+  var prevOutType
+  var prevOutScript
 
-    return quacksLike;
-  },
+  var p2sh = false
+  var p2shType
+  var redeemScriptHash
+
+  var witness = false
+  var p2wsh = false
+  var witnessType
+  var witnessScriptHash
+
+  var signType
+  var signScript
+
+  if (redeemScript && witnessScript) {
+    redeemScriptHash = bcrypto.hash160(redeemScript)
+    witnessScriptHash = bcrypto.sha256(witnessScript)
+    checkP2shInput(input, redeemScriptHash)
+
+    if (!redeemScript.equals(bscript.witnessScriptHash.output.encode(witnessScriptHash))) throw new Error('Witness script inconsistent with redeem script')
+
+    expanded = expandOutput(witnessScript, undefined, kpPubKey)
+    if (!expanded.pubKeys) throw new Error('WitnessScript not supported "' + bscript.toASM(redeemScript) + '"')
+    prevOutType = bscript.types.P2SH
+    prevOutScript = bscript.scriptHash.output.encode(redeemScriptHash)
+    p2sh = witness = p2wsh = true
+    p2shType = bscript.types.P2WSH
+    signType = witnessType = expanded.scriptType
+    signScript = witnessScript
+  } else if (redeemScript) {
+    redeemScriptHash = bcrypto.hash160(redeemScript)
+    checkP2shInput(input, redeemScriptHash)
+
+    expanded = expandOutput(redeemScript, undefined, kpPubKey)
+    if (!expanded.pubKeys) throw new Error('RedeemScript not supported "' + bscript.toASM(redeemScript) + '"')
+
+    prevOutType = bscript.types.P2SH
+    prevOutScript = bscript.scriptHash.output.encode(redeemScriptHash)
+    p2sh = true
+    signType = p2shType = expanded.scriptType
+    signScript = redeemScript
+    witness = signType === bscript.types.P2WPKH
+  } else if (witnessScript) {
+    witnessScriptHash = bcrypto.sha256(witnessScript)
+    checkP2WSHInput(input, witnessScriptHash)
+
+    expanded = expandOutput(witnessScript, undefined, kpPubKey)
+    if (!expanded.pubKeys) throw new Error('WitnessScript not supported "' + bscript.toASM(redeemScript) + '"')
+
+    prevOutType = bscript.types.P2WSH
+    prevOutScript = bscript.witnessScriptHash.output.encode(witnessScriptHash)
+    witness = p2wsh = true
+    signType = witnessType = expanded.scriptType
+    signScript = witnessScript
+  } else if (input.prevOutType) {
+    // embedded scripts are not possible without a redeemScript
+    if (input.prevOutType === scriptTypes.P2SH ||
+      input.prevOutType === scriptTypes.P2WSH) {
+      throw new Error('PrevOutScript is ' + input.prevOutType + ', requires redeemScript')
+    }
+
+    prevOutType = input.prevOutType
+    prevOutScript = input.prevOutScript
+    expanded = expandOutput(input.prevOutScript, input.prevOutType, kpPubKey)
+    if (!expanded.pubKeys) return
+
+    witness = (input.prevOutType === scriptTypes.P2WPKH)
+    signType = prevOutType
+    signScript = prevOutScript
+  } else {
+    prevOutScript = bscript.pubKeyHash.output.encode(bcrypto.hash160(kpPubKey))
+    expanded = expandOutput(prevOutScript, scriptTypes.P2PKH, kpPubKey)
+    prevOutType = scriptTypes.P2PKH
+    witness = false
+    signType = prevOutType
+    signScript = prevOutScript
+  }
 
-  tuple: function tuple() {
-    for (var _len2 = arguments.length, types = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
-      types[_key2] = arguments[_key2];
-    }
+  if (witness && !types.Satoshi(witnessValue)) {
+    throw new Error('Input was witness but not given witness value')
+  }
 
-    function tuple(value, strict) {
-      return types.every(function (type, i) {
-        return typeforce(type, value[i], strict);
-      });
-    }
-    tuple.toJSON = function () {
-      return '(' + types.map(sJSON).join(', ') + ')';
-    };
+  if (signType === scriptTypes.P2WPKH) {
+    signScript = bscript.pubKeyHash.output.encode(bscript.witnessPubKeyHash.output.decode(signScript))
+  }
 
-    return tuple;
-  },
+  if (p2sh) {
+    input.redeemScript = redeemScript
+    input.redeemScriptType = p2shType
+  }
 
-  value: function value(expected) {
-    function value(actual) {
-      return actual === expected;
-    }
-    value.toJSON = function () {
-      return expected;
-    };
+  if (p2wsh) {
+    input.witnessScript = witnessScript
+    input.witnessScriptType = witnessType
+  }
 
-    return value;
+  input.pubKeys = expanded.pubKeys
+  input.signatures = expanded.signatures
+  input.signScript = signScript
+  input.signType = signType
+  input.prevOutScript = prevOutScript
+  input.prevOutType = prevOutType
+  input.witness = witness
+}
+
+function buildStack (type, signatures, pubKeys, allowIncomplete) {
+  if (type === scriptTypes.P2PKH) {
+    if (signatures.length === 1 && Buffer.isBuffer(signatures[0]) && pubKeys.length === 1) return bscript.pubKeyHash.input.encodeStack(signatures[0], pubKeys[0])
+  } else if (type === scriptTypes.P2PK) {
+    if (signatures.length === 1 && Buffer.isBuffer(signatures[0])) return bscript.pubKey.input.encodeStack(signatures[0])
+  } else if (type === scriptTypes.MULTISIG) {
+    if (signatures.length > 0) {
+      signatures = signatures.map(function (signature) {
+        return signature || ops.OP_0
+      })
+      if (!allowIncomplete) {
+        // remove blank signatures
+        signatures = signatures.filter(function (x) { return x !== ops.OP_0 })
+      }
+
+      return bscript.multisig.input.encodeStack(signatures /* see if it's necessary first */)
+    }
+  } else {
+    throw new Error('Not yet supported')
   }
-};
 
-function compile(type) {
-  if (nativeTypes.String(type)) {
-    if (type[0] === '?') return otherTypes.maybe(compile(type.slice(1)));
+  if (!allowIncomplete) throw new Error('Not enough signatures provided')
 
-    return nativeTypes[type] || otherTypes.quacksLike(type);
-  } else if (type && nativeTypes.Object(type)) {
-    if (nativeTypes.Array(type)) return otherTypes.arrayOf(compile(type[0]));
+  return []
+}
 
-    var compiled = {};
+function buildInput (input, allowIncomplete) {
+  var scriptType = input.prevOutType
+  var sig = []
+  var witness = []
+  if (SIGNABLE.indexOf(scriptType) !== -1) {
+    sig = buildStack(scriptType, input.signatures, input.pubKeys, allowIncomplete)
+  }
 
-    for (var propertyName in type) {
-      compiled[propertyName] = compile(type[propertyName]);
+  var p2sh = false
+  if (scriptType === bscript.types.P2SH) {
+    // We can remove this error later when we have a guarantee prepareInput
+    // rejects unsignable scripts - it MUST be signable at this point.
+    if (P2SH.indexOf(input.redeemScriptType) === -1) {
+      throw new Error('Impossible to sign this type')
     }
-
-    return otherTypes.object(compiled);
-  } else if (nativeTypes.Function(type)) {
-    return type;
+    p2sh = true
+    if (SIGNABLE.indexOf(input.redeemScriptType) !== -1) {
+      sig = buildStack(input.redeemScriptType, input.signatures, input.pubKeys, allowIncomplete)
+    }
+    // If it wasn't SIGNABLE, it's witness, defer to that
+    scriptType = input.redeemScriptType
   }
 
-  return otherTypes.value(type);
-}
-
-function typeforce(_x3, _x4, _x5) {
-  var _again = true;
-
-  _function: while (_again) {
-    var type = _x3,
-        value = _x4,
-        strict = _x5;
-    _again = false;
+  if (scriptType === bscript.types.P2WPKH) {
+    // P2WPKH is a special case of P2PKH
+    witness = buildStack(bscript.types.P2PKH, input.signatures, input.pubKeys, allowIncomplete)
+  } else if (scriptType === bscript.types.P2WSH) {
+    // We can remove this check later
+    if (SIGNABLE.indexOf(input.witnessScriptType) !== -1) {
+      witness = buildStack(input.witnessScriptType, input.signatures, input.pubKeys, allowIncomplete)
+      witness.push(input.witnessScript)
+    } else {
+      // We can remove this error later when we have a guarantee prepareInput
+      // rejects unsignble scripts - it MUST be signable at this point.
+      throw new Error()
+    }
 
-    if (nativeTypes.Function(type)) {
-      if (type(value, strict)) return true;
+    scriptType = input.witnessScriptType
+  }
 
-      throw new TypeError(tfErrorString(type, value));
-    }
+  // append redeemScript if necessary
+  if (p2sh) {
+    sig.push(input.redeemScript)
+  }
 
-    // JIT
-    _x3 = compile(type);
-    _x4 = value;
-    _x5 = strict;
-    _again = true;
-    continue _function;
+  return {
+    type: scriptType,
+    script: bscript.compile(sig),
+    witness: witness
   }
 }
 
-// assign all types to typeforce function
-var typeName;
-Object.keys(nativeTypes).forEach(function (typeName) {
-  var nativeType = nativeTypes[typeName];
-  nativeType.toJSON = function () {
-    return typeName;
-  };
+function TransactionBuilder (network, maximumFeeRate) {
+  this.prevTxMap = {}
+  this.network = network || networks.bitcoin
 
-  typeforce[typeName] = nativeType;
-});
+  // WARNING: This is __NOT__ to be relied on, its just another potential safety mechanism (safety in-depth)
+  this.maximumFeeRate = maximumFeeRate || 1000
 
-for (typeName in otherTypes) {
-  typeforce[typeName] = otherTypes[typeName];
+  this.inputs = []
+  this.tx = new Transaction()
 }
 
-module.exports = typeforce;
-module.exports.compile = compile;
-}).call(this,require("buffer").Buffer)
-},{"buffer":7}],54:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var base58check = require('bs58check')
-var typeForce = require('typeforce')
-var networks = require('./networks')
-var scripts = require('./scripts')
+TransactionBuilder.prototype.setLockTime = function (locktime) {
+  typeforce(types.UInt32, locktime)
 
-function findScriptTypeByVersion (version) {
-  for (var networkName in networks) {
-    var network = networks[networkName]
+  // if any signatures exist, throw
+  if (this.inputs.some(function (input) {
+    if (!input.signatures) return false
 
-    if (version === network.pubKeyHash) return 'pubkeyhash'
-    if (version === network.scriptHash) return 'scripthash'
+    return input.signatures.some(function (s) { return s })
+  })) {
+    throw new Error('No, this would invalidate signatures')
   }
-}
 
-function Address (hash, version) {
-  typeForce('Buffer', hash)
+  this.tx.locktime = locktime
+}
 
-  assert.strictEqual(hash.length, 20, 'Invalid hash length')
-  assert.strictEqual(version & 0xff, version, 'Invalid version byte')
+TransactionBuilder.prototype.setVersion = function (version) {
+  typeforce(types.UInt32, version)
 
-  this.hash = hash
-  this.version = version
+  // XXX: this might eventually become more complex depending on what the versions represent
+  this.tx.version = version
 }
 
-Address.fromBase58Check = function (string) {
-  var payload = base58check.decode(string)
-  var version = payload.readUInt8(0)
-  var hash = payload.slice(1)
+TransactionBuilder.fromTransaction = function (transaction, network) {
+  var txb = new TransactionBuilder(network)
 
-  return new Address(hash, version)
-}
+  // Copy transaction fields
+  txb.setVersion(transaction.version)
+  txb.setLockTime(transaction.locktime)
 
-Address.fromOutputScript = function (script, network) {
-  network = network || networks.bitcoin
+  // Copy outputs (done first to avoid signature invalidation)
+  transaction.outs.forEach(function (txOut) {
+    txb.addOutput(txOut.script, txOut.value)
+  })
 
-  if (scripts.isPubKeyHashOutput(script)) return new Address(script.chunks[2], network.pubKeyHash)
-  if (scripts.isScriptHashOutput(script)) return new Address(script.chunks[1], network.scriptHash)
+  // Copy inputs
+  transaction.ins.forEach(function (txIn) {
+    txb.__addInputUnsafe(txIn.hash, txIn.index, {
+      sequence: txIn.sequence,
+      script: txIn.script,
+      witness: txIn.witness
+    })
+  })
 
-  assert(false, script.toASM() + ' has no matching Address')
+  // fix some things not possible through the public API
+  txb.inputs.forEach(function (input, i) {
+    fixMultisigOrder(input, transaction, i)
+  })
+
+  return txb
 }
 
-Address.prototype.toBase58Check = function () {
-  var payload = new Buffer(21)
-  payload.writeUInt8(this.version, 0)
-  this.hash.copy(payload, 1)
+TransactionBuilder.prototype.addInput = function (txHash, vout, sequence, prevOutScript) {
+  if (!this.__canModifyInputs()) {
+    throw new Error('No, this would invalidate signatures')
+  }
+
+  var value
 
-  return base58check.encode(payload)
-}
+  // is it a hex string?
+  if (typeof txHash === 'string') {
+    // transaction hashs's are displayed in reverse order, un-reverse it
+    txHash = Buffer.from(txHash, 'hex').reverse()
 
-Address.prototype.toOutputScript = function () {
-  var scriptType = findScriptTypeByVersion(this.version)
+  // is it a Transaction object?
+  } else if (txHash instanceof Transaction) {
+    var txOut = txHash.outs[vout]
+    prevOutScript = txOut.script
+    value = txOut.value
 
-  if (scriptType === 'pubkeyhash') return scripts.pubKeyHashOutput(this.hash)
-  if (scriptType === 'scripthash') return scripts.scriptHashOutput(this.hash)
+    txHash = txHash.getHash()
+  }
 
-  assert(false, this.toString() + ' has no matching Script')
+  return this.__addInputUnsafe(txHash, vout, {
+    sequence: sequence,
+    prevOutScript: prevOutScript,
+    value: value
+  })
 }
 
-Address.prototype.toString = Address.prototype.toBase58Check
+TransactionBuilder.prototype.__addInputUnsafe = function (txHash, vout, options) {
+  if (Transaction.isCoinbaseHash(txHash)) {
+    throw new Error('coinbase inputs not supported')
+  }
 
-module.exports = Address
+  var prevTxOut = txHash.toString('hex') + ':' + vout
+  if (this.prevTxMap[prevTxOut] !== undefined) throw new Error('Duplicate TxOut: ' + prevTxOut)
 
-}).call(this,require("buffer").Buffer)
-},{"./networks":66,"./scripts":69,"assert":5,"bs58check":31,"buffer":7,"typeforce":53}],55:[function(require,module,exports){
-var bs58check = require('bs58check')
+  var input = {}
 
-function decode () {
-  console.warn('bs58check will be removed in 2.0.0. require("bs58check") instead.')
+  // derive what we can from the scriptSig
+  if (options.script !== undefined) {
+    input = expandInput(options.script, options.witness || [])
+  }
 
-  return bs58check.decode.apply(undefined, arguments)
-}
+  // if an input value was given, retain it
+  if (options.value !== undefined) {
+    input.value = options.value
+  }
 
-function encode () {
-  console.warn('bs58check will be removed in 2.0.0. require("bs58check") instead.')
+  // derive what we can from the previous transactions output script
+  if (!input.prevOutScript && options.prevOutScript) {
+    var prevOutType
 
-  return bs58check.encode.apply(undefined, arguments)
-}
+    if (!input.pubKeys && !input.signatures) {
+      var expanded = expandOutput(options.prevOutScript)
 
-module.exports = {
-  decode: decode,
-  encode: encode
-}
+      if (expanded.pubKeys) {
+        input.pubKeys = expanded.pubKeys
+        input.signatures = expanded.signatures
+      }
 
-},{"bs58check":31}],56:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var bufferutils = require('./bufferutils')
-var crypto = require('./crypto')
+      prevOutType = expanded.scriptType
+    }
 
-var Transaction = require('./transaction')
+    input.prevOutScript = options.prevOutScript
+    input.prevOutType = prevOutType || bscript.classifyOutput(options.prevOutScript)
+  }
 
-function Block () {
-  this.version = 1
-  this.prevHash = null
-  this.merkleRoot = null
-  this.timestamp = 0
-  this.bits = 0
-  this.nonce = 0
-}
+  var vin = this.tx.addInput(txHash, vout, options.sequence, options.scriptSig)
+  this.inputs[vin] = input
+  this.prevTxMap[prevTxOut] = vin
 
-Block.fromBuffer = function (buffer) {
-  assert(buffer.length >= 80, 'Buffer too small (< 80 bytes)')
+  return vin
+}
 
-  var offset = 0
-  function readSlice (n) {
-    offset += n
-    return buffer.slice(offset - n, offset)
+TransactionBuilder.prototype.addOutput = function (scriptPubKey, value) {
+  if (!this.__canModifyOutputs()) {
+    throw new Error('No, this would invalidate signatures')
   }
 
-  function readUInt32 () {
-    var i = buffer.readUInt32LE(offset)
-    offset += 4
-    return i
+  // Attempt to get a script if it's a base58 address string
+  if (typeof scriptPubKey === 'string') {
+    scriptPubKey = baddress.toOutputScript(scriptPubKey, this.network)
   }
 
-  var block = new Block()
-  block.version = readUInt32()
-  block.prevHash = readSlice(32)
-  block.merkleRoot = readSlice(32)
-  block.timestamp = readUInt32()
-  block.bits = readUInt32()
-  block.nonce = readUInt32()
+  return this.tx.addOutput(scriptPubKey, value)
+}
 
-  if (buffer.length === 80) return block
+TransactionBuilder.prototype.build = function () {
+  return this.__build(false)
+}
+TransactionBuilder.prototype.buildIncomplete = function () {
+  return this.__build(true)
+}
 
-  function readVarInt () {
-    var vi = bufferutils.readVarInt(buffer, offset)
-    offset += vi.size
-    return vi.number
+TransactionBuilder.prototype.__build = function (allowIncomplete) {
+  if (!allowIncomplete) {
+    if (!this.tx.ins.length) throw new Error('Transaction has no inputs')
+    if (!this.tx.outs.length) throw new Error('Transaction has no outputs')
   }
 
-  // FIXME: poor performance
-  function readTransaction () {
-    var tx = Transaction.fromBuffer(buffer.slice(offset), true)
+  var tx = this.tx.clone()
+  // Create script signatures from inputs
+  this.inputs.forEach(function (input, i) {
+    var scriptType = input.witnessScriptType || input.redeemScriptType || input.prevOutType
+    if (!scriptType && !allowIncomplete) throw new Error('Transaction is not complete')
+    var result = buildInput(input, allowIncomplete)
 
-    offset += tx.toBuffer().length
-    return tx
-  }
+    // skip if no result
+    if (!allowIncomplete) {
+      if (SIGNABLE.indexOf(result.type) === -1 && result.type !== bscript.types.P2WPKH) {
+        throw new Error(result.type + ' not supported')
+      }
+    }
 
-  var nTransactions = readVarInt()
-  block.transactions = []
+    tx.setInputScript(i, result.script)
+    tx.setWitness(i, result.witness)
+  })
 
-  for (var i = 0; i < nTransactions; ++i) {
-    var tx = readTransaction()
-    block.transactions.push(tx)
+  if (!allowIncomplete) {
+    // do not rely on this, its merely a last resort
+    if (this.__overMaximumFees(tx.byteLength())) {
+      throw new Error('Transaction has absurd fees')
+    }
   }
 
-  return block
-}
-
-Block.fromHex = function (hex) {
-  return Block.fromBuffer(new Buffer(hex, 'hex'))
-}
-
-Block.prototype.getHash = function () {
-  return crypto.hash256(this.toBuffer(true))
+  return tx
 }
 
-Block.prototype.getId = function () {
-  return bufferutils.reverse(this.getHash()).toString('hex')
+function canSign (input) {
+  return input.prevOutScript !== undefined &&
+    input.signScript !== undefined &&
+    input.pubKeys !== undefined &&
+    input.signatures !== undefined &&
+    input.signatures.length === input.pubKeys.length &&
+    input.pubKeys.length > 0 &&
+    input.witness !== undefined
 }
 
-Block.prototype.getUTCDate = function () {
-  var date = new Date(0) // epoch
-  date.setUTCSeconds(this.timestamp)
-
-  return date
-}
+TransactionBuilder.prototype.sign = function (vin, keyPair, redeemScript, hashType, witnessValue, witnessScript) {
+  if (keyPair.network !== this.network) throw new Error('Inconsistent network')
+  if (!this.inputs[vin]) throw new Error('No input at index: ' + vin)
+  hashType = hashType || Transaction.SIGHASH_ALL
 
-Block.prototype.toBuffer = function (headersOnly) {
-  var buffer = new Buffer(80)
+  var input = this.inputs[vin]
 
-  var offset = 0
-  function writeSlice (slice) {
-    slice.copy(buffer, offset)
-    offset += slice.length
+  // if redeemScript was previously provided, enforce consistency
+  if (input.redeemScript !== undefined &&
+      redeemScript &&
+      !input.redeemScript.equals(redeemScript)) {
+    throw new Error('Inconsistent redeemScript')
   }
 
-  function writeUInt32 (i) {
-    buffer.writeUInt32LE(i, offset)
-    offset += 4
+  var kpPubKey = keyPair.getPublicKeyBuffer()
+  if (!canSign(input)) {
+    prepareInput(input, kpPubKey, redeemScript, witnessValue, witnessScript)
+    if (!canSign(input)) throw Error(input.prevOutType + ' not supported')
   }
 
-  writeUInt32(this.version)
-  writeSlice(this.prevHash)
-  writeSlice(this.merkleRoot)
-  writeUInt32(this.timestamp)
-  writeUInt32(this.bits)
-  writeUInt32(this.nonce)
-
-  if (headersOnly || !this.transactions) return buffer
+  // ready to sign
+  var signatureHash
+  if (input.witness) {
+    signatureHash = this.tx.hashForWitnessV0(vin, input.signScript, witnessValue, hashType)
+  } else {
+    signatureHash = this.tx.hashForSignature(vin, input.signScript, hashType)
+  }
+  // enforce in order signing of public keys
+  var signed = input.pubKeys.some(function (pubKey, i) {
+    if (!kpPubKey.equals(pubKey)) return false
+    if (input.signatures[i]) throw new Error('Signature already exists')
 
-  var txLenBuffer = bufferutils.varIntBuffer(this.transactions.length)
-  var txBuffers = this.transactions.map(function (tx) {
-    return tx.toBuffer()
+    input.signatures[i] = keyPair.sign(signatureHash).toScriptSignature(hashType)
+    return true
   })
 
-  return Buffer.concat([buffer, txLenBuffer].concat(txBuffers))
+  if (!signed) throw new Error('Key pair cannot sign for this input')
 }
 
-Block.prototype.toHex = function (headersOnly) {
-  return this.toBuffer(headersOnly).toString('hex')
+function signatureHashType (buffer) {
+  return buffer.readUInt8(buffer.length - 1)
 }
 
-module.exports = Block
-
-}).call(this,require("buffer").Buffer)
-},{"./bufferutils":57,"./crypto":58,"./transaction":70,"assert":5,"buffer":7}],57:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var opcodes = require('./opcodes')
+TransactionBuilder.prototype.__canModifyInputs = function () {
+  return this.inputs.every(function (input) {
+    // any signatures?
+    if (input.signatures === undefined) return true
 
-// https://github.com/feross/buffer/blob/master/index.js#L1127
-function verifuint (value, max) {
-  assert(typeof value === 'number', 'cannot write a non-number as a number')
-  assert(value >= 0, 'specified a negative value for writing an unsigned value')
-  assert(value <= max, 'value is larger than maximum value for type')
-  assert(Math.floor(value) === value, 'value has a fractional component')
-}
+    return input.signatures.every(function (signature) {
+      if (!signature) return true
+      var hashType = signatureHashType(signature)
 
-function pushDataSize (i) {
-  return i < opcodes.OP_PUSHDATA1 ? 1
-  : i < 0xff ? 2
-  : i < 0xffff ? 3
-  : 5
+      // if SIGHASH_ANYONECANPAY is set, signatures would not
+      // be invalidated by more inputs
+      return hashType & Transaction.SIGHASH_ANYONECANPAY
+    })
+  })
 }
 
-function readPushDataInt (buffer, offset) {
-  var opcode = buffer.readUInt8(offset)
-  var number, size
+TransactionBuilder.prototype.__canModifyOutputs = function () {
+  var nInputs = this.tx.ins.length
+  var nOutputs = this.tx.outs.length
 
-  // ~6 bit
-  if (opcode < opcodes.OP_PUSHDATA1) {
-    number = opcode
-    size = 1
+  return this.inputs.every(function (input) {
+    if (input.signatures === undefined) return true
 
-  // 8 bit
-  } else if (opcode === opcodes.OP_PUSHDATA1) {
-    if (offset + 2 > buffer.length) return null
-    number = buffer.readUInt8(offset + 1)
-    size = 2
+    return input.signatures.every(function (signature) {
+      if (!signature) return true
+      var hashType = signatureHashType(signature)
 
-  // 16 bit
-  } else if (opcode === opcodes.OP_PUSHDATA2) {
-    if (offset + 3 > buffer.length) return null
-    number = buffer.readUInt16LE(offset + 1)
-    size = 3
+      var hashTypeMod = hashType & 0x1f
+      if (hashTypeMod === Transaction.SIGHASH_NONE) return true
+      if (hashTypeMod === Transaction.SIGHASH_SINGLE) {
+        // if SIGHASH_SINGLE is set, and nInputs > nOutputs
+        // some signatures would be invalidated by the addition
+        // of more outputs
+        return nInputs <= nOutputs
+      }
+    })
+  })
+}
 
-  // 32 bit
-  } else {
-    if (offset + 5 > buffer.length) return null
-    assert.equal(opcode, opcodes.OP_PUSHDATA4, 'Unexpected opcode')
+TransactionBuilder.prototype.__overMaximumFees = function (bytes) {
+  // not all inputs will have .value defined
+  var incoming = this.inputs.reduce(function (a, x) { return a + (x.value >>> 0) }, 0)
 
-    number = buffer.readUInt32LE(offset + 1)
-    size = 5
-  }
+  // but all outputs do, and if we have any input value
+  // we can immediately determine if the outputs are too small
+  var outgoing = this.tx.outs.reduce(function (a, x) { return a + x.value }, 0)
+  var fee = incoming - outgoing
+  var feeRate = fee / bytes
 
-  return {
-    opcode: opcode,
-    number: number,
-    size: size
-  }
+  return feeRate > this.maximumFeeRate
 }
 
-function readUInt64LE (buffer, offset) {
-  var a = buffer.readUInt32LE(offset)
-  var b = buffer.readUInt32LE(offset + 4)
-  b *= 0x100000000
+module.exports = TransactionBuilder
 
-  verifuint(b + a, 0x001fffffffffffff)
+},{"./address":42,"./crypto":45,"./ecpair":47,"./ecsignature":48,"./networks":51,"./script":52,"./transaction":76,"./types":78,"bitcoin-ops":40,"safe-buffer":98,"typeforce":109}],78:[function(require,module,exports){
+var typeforce = require('typeforce')
 
-  return b + a
+var UINT31_MAX = Math.pow(2, 31) - 1
+function UInt31 (value) {
+  return typeforce.UInt32(value) && value <= UINT31_MAX
 }
 
-function readVarInt (buffer, offset) {
-  var t = buffer.readUInt8(offset)
-  var number, size
+function BIP32Path (value) {
+  return typeforce.String(value) && value.match(/^(m\/)?(\d+'?\/)*\d+'?$/)
+}
+BIP32Path.toJSON = function () { return 'BIP32 derivation path' }
 
-  // 8 bit
-  if (t < 253) {
-    number = t
-    size = 1
+var SATOSHI_MAX = 21 * 1e14
+function Satoshi (value) {
+  return typeforce.UInt53(value) && value <= SATOSHI_MAX
+}
 
-  // 16 bit
-  } else if (t < 254) {
-    number = buffer.readUInt16LE(offset + 1)
-    size = 3
+// external dependent types
+var BigInt = typeforce.quacksLike('BigInteger')
+var ECPoint = typeforce.quacksLike('Point')
 
-  // 32 bit
-  } else if (t < 255) {
-    number = buffer.readUInt32LE(offset + 1)
-    size = 5
+// exposed, external API
+var ECSignature = typeforce.compile({ r: BigInt, s: BigInt })
+var Network = typeforce.compile({
+  messagePrefix: typeforce.oneOf(typeforce.Buffer, typeforce.String),
+  bip32: {
+    public: typeforce.UInt32,
+    private: typeforce.UInt32
+  },
+  pubKeyHash: typeforce.UInt8,
+  scriptHash: typeforce.UInt8,
+  wif: typeforce.UInt8
+})
 
-  // 64 bit
-  } else {
-    number = readUInt64LE(buffer, offset + 1)
-    size = 9
-  }
+// extend typeforce types with ours
+var types = {
+  BigInt: BigInt,
+  BIP32Path: BIP32Path,
+  Buffer256bit: typeforce.BufferN(32),
+  ECPoint: ECPoint,
+  ECSignature: ECSignature,
+  Hash160bit: typeforce.BufferN(20),
+  Hash256bit: typeforce.BufferN(32),
+  Network: Network,
+  Satoshi: Satoshi,
+  UInt31: UInt31
+}
 
-  return {
-    number: number,
-    size: size
-  }
+for (var typeName in typeforce) {
+  types[typeName] = typeforce[typeName]
 }
 
-function writePushDataInt (buffer, number, offset) {
-  var size = pushDataSize(number)
+module.exports = types
 
-  // ~6 bit
-  if (size === 1) {
-    buffer.writeUInt8(number, offset)
+},{"typeforce":109}],79:[function(require,module,exports){
+var basex = require('base-x')
+var ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 
-  // 8 bit
-  } else if (size === 2) {
-    buffer.writeUInt8(opcodes.OP_PUSHDATA1, offset)
-    buffer.writeUInt8(number, offset + 1)
+module.exports = basex(ALPHABET)
 
-  // 16 bit
-  } else if (size === 3) {
-    buffer.writeUInt8(opcodes.OP_PUSHDATA2, offset)
-    buffer.writeUInt16LE(number, offset + 1)
+},{"base-x":34}],80:[function(require,module,exports){
+(function (Buffer){
+'use strict'
 
-  // 32 bit
-  } else {
-    buffer.writeUInt8(opcodes.OP_PUSHDATA4, offset)
-    buffer.writeUInt32LE(number, offset + 1)
-  }
+var base58 = require('bs58')
+var createHash = require('create-hash')
 
-  return size
+// SHA256(SHA256(buffer))
+function sha256x2 (buffer) {
+  var tmp = createHash('sha256').update(buffer).digest()
+  return createHash('sha256').update(tmp).digest()
 }
 
-function writeUInt64LE (buffer, value, offset) {
-  verifuint(value, 0x001fffffffffffff)
-
-  buffer.writeInt32LE(value & -1, offset)
-  buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4)
-}
+// Encode a buffer as a base58-check encoded string
+function encode (payload) {
+  var checksum = sha256x2(payload)
 
-function varIntSize (i) {
-  return i < 253 ? 1
-  : i < 0x10000 ? 3
-  : i < 0x100000000 ? 5
-  : 9
+  return base58.encode(Buffer.concat([
+    payload,
+    checksum
+  ], payload.length + 4))
 }
 
-function writeVarInt (buffer, number, offset) {
-  var size = varIntSize(number)
-
-  // 8 bit
-  if (size === 1) {
-    buffer.writeUInt8(number, offset)
-
-  // 16 bit
-  } else if (size === 3) {
-    buffer.writeUInt8(253, offset)
-    buffer.writeUInt16LE(number, offset + 1)
-
-  // 32 bit
-  } else if (size === 5) {
-    buffer.writeUInt8(254, offset)
-    buffer.writeUInt32LE(number, offset + 1)
+function decodeRaw (buffer) {
+  var payload = buffer.slice(0, -4)
+  var checksum = buffer.slice(-4)
+  var newChecksum = sha256x2(payload)
 
-  // 64 bit
-  } else {
-    buffer.writeUInt8(255, offset)
-    writeUInt64LE(buffer, number, offset + 1)
-  }
+  if (checksum[0] ^ newChecksum[0] |
+      checksum[1] ^ newChecksum[1] |
+      checksum[2] ^ newChecksum[2] |
+      checksum[3] ^ newChecksum[3]) return
 
-  return size
+  return payload
 }
 
-function varIntBuffer (i) {
-  var size = varIntSize(i)
-  var buffer = new Buffer(size)
-  writeVarInt(buffer, i, 0)
+// Decode a base58-check encoded string to a buffer, no result if checksum is wrong
+function decodeUnsafe (string) {
+  var buffer = base58.decodeUnsafe(string)
+  if (!buffer) return
 
-  return buffer
+  return decodeRaw(buffer)
 }
 
-function reverse (buffer) {
-  var buffer2 = new Buffer(buffer)
-  Array.prototype.reverse.call(buffer2)
-  return buffer2
+function decode (string) {
+  var buffer = base58.decode(string)
+  var payload = decodeRaw(buffer)
+  if (!payload) throw new Error('Invalid checksum')
+  return payload
 }
 
 module.exports = {
-  pushDataSize: pushDataSize,
-  readPushDataInt: readPushDataInt,
-  readUInt64LE: readUInt64LE,
-  readVarInt: readVarInt,
-  reverse: reverse,
-  varIntBuffer: varIntBuffer,
-  varIntSize: varIntSize,
-  writePushDataInt: writePushDataInt,
-  writeUInt64LE: writeUInt64LE,
-  writeVarInt: writeVarInt
+  encode: encode,
+  decode: decode,
+  decodeUnsafe: decodeUnsafe
 }
 
 }).call(this,require("buffer").Buffer)
-},{"./opcodes":67,"assert":5,"buffer":7}],58:[function(require,module,exports){
-var createHash = require('create-hash')
+},{"bs58":79,"buffer":4,"create-hash":82}],81:[function(require,module,exports){
+var Buffer = require('safe-buffer').Buffer
+var Transform = require('stream').Transform
+var StringDecoder = require('string_decoder').StringDecoder
+var inherits = require('inherits')
 
-function hash160 (buffer) {
-  return ripemd160(sha256(buffer))
+function CipherBase (hashMode) {
+  Transform.call(this)
+  this.hashMode = typeof hashMode === 'string'
+  if (this.hashMode) {
+    this[hashMode] = this._finalOrDigest
+  } else {
+    this.final = this._finalOrDigest
+  }
+  if (this._final) {
+    this.__final = this._final
+    this._final = null
+  }
+  this._decoder = null
+  this._encoding = null
 }
+inherits(CipherBase, Transform)
 
-function hash256 (buffer) {
-  return sha256(sha256(buffer))
-}
+CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
+  if (typeof data === 'string') {
+    data = Buffer.from(data, inputEnc)
+  }
 
-function ripemd160 (buffer) {
-  return createHash('rmd160').update(buffer).digest()
-}
+  var outData = this._update(data)
+  if (this.hashMode) return this
 
-function sha1 (buffer) {
-  return createHash('sha1').update(buffer).digest()
-}
+  if (outputEnc) {
+    outData = this._toString(outData, outputEnc)
+  }
 
-function sha256 (buffer) {
-  return createHash('sha256').update(buffer).digest()
+  return outData
 }
 
-// FIXME: Name not consistent with others
-var createHmac = require('create-hmac')
-
-function HmacSHA256 (buffer, secret) {
-  console.warn('Hmac* functions are deprecated for removal in 2.0.0, use node crypto instead')
-  return createHmac('sha256', secret).update(buffer).digest()
+CipherBase.prototype.setAutoPadding = function () {}
+CipherBase.prototype.getAuthTag = function () {
+  throw new Error('trying to get auth tag in unsupported state')
 }
 
-function HmacSHA512 (buffer, secret) {
-  console.warn('Hmac* functions are deprecated for removal in 2.0.0, use node crypto instead')
-  return createHmac('sha512', secret).update(buffer).digest()
+CipherBase.prototype.setAuthTag = function () {
+  throw new Error('trying to set auth tag in unsupported state')
 }
 
-module.exports = {
-  ripemd160: ripemd160,
-  sha1: sha1,
-  sha256: sha256,
-  hash160: hash160,
-  hash256: hash256,
-  HmacSHA256: HmacSHA256,
-  HmacSHA512: HmacSHA512
+CipherBase.prototype.setAAD = function () {
+  throw new Error('trying to set aad in unsupported state')
 }
 
-},{"create-hash":32,"create-hmac":45}],59:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var createHmac = require('create-hmac')
-var typeForce = require('typeforce')
-
-var BigInteger = require('bigi')
-var ECSignature = require('./ecsignature')
-
-var ZERO = new Buffer([0])
-var ONE = new Buffer([1])
-
-// https://tools.ietf.org/html/rfc6979#section-3.2
-function deterministicGenerateK (curve, hash, d, checkSig) {
-  typeForce('Buffer', hash)
-  typeForce('BigInteger', d)
-
-  // FIXME: remove/uncomment for 2.0.0
-  //  typeForce('Function', checkSig)
-
-  if (typeof checkSig !== 'function') {
-    console.warn('deterministicGenerateK requires a checkSig callback in 2.0.0, see #337 for more information')
-
-    checkSig = function (k) {
-      var G = curve.G
-      var n = curve.n
-      var e = BigInteger.fromBuffer(hash)
-
-      var Q = G.multiply(k)
-
-      if (curve.isInfinity(Q))
-        return false
-
-      var r = Q.affineX.mod(n)
-      if (r.signum() === 0)
-        return false
+CipherBase.prototype._transform = function (data, _, next) {
+  var err
+  try {
+    if (this.hashMode) {
+      this._update(data)
+    } else {
+      this.push(this._update(data))
+    }
+  } catch (e) {
+    err = e
+  } finally {
+    next(err)
+  }
+}
+CipherBase.prototype._flush = function (done) {
+  var err
+  try {
+    this.push(this.__final())
+  } catch (e) {
+    err = e
+  }
 
-      var s = k.modInverse(n).multiply(e.add(d.multiply(r))).mod(n)
-      if (s.signum() === 0)
-        return false
+  done(err)
+}
+CipherBase.prototype._finalOrDigest = function (outputEnc) {
+  var outData = this.__final() || Buffer.alloc(0)
+  if (outputEnc) {
+    outData = this._toString(outData, outputEnc, true)
+  }
+  return outData
+}
 
-      return true
-    }
+CipherBase.prototype._toString = function (value, enc, fin) {
+  if (!this._decoder) {
+    this._decoder = new StringDecoder(enc)
+    this._encoding = enc
   }
 
-  // sanity check
-  assert.equal(hash.length, 32, 'Hash must be 256 bit')
+  if (this._encoding !== enc) throw new Error('can\'t switch encodings')
 
-  var x = d.toBuffer(32)
-  var k = new Buffer(32)
-  var v = new Buffer(32)
+  var out = this._decoder.write(value)
+  if (fin) {
+    out += this._decoder.end()
+  }
 
-  // Step A, ignored as hash already provided
-  // Step B
-  v.fill(1)
+  return out
+}
 
-  // Step C
-  k.fill(0)
+module.exports = CipherBase
 
-  // Step D
-  k = createHmac('sha256', k)
-    .update(v)
-    .update(ZERO)
-    .update(x)
-    .update(hash)
-    .digest()
+},{"inherits":93,"safe-buffer":98,"stream":27,"string_decoder":28}],82:[function(require,module,exports){
+(function (Buffer){
+'use strict'
+var inherits = require('inherits')
+var md5 = require('./md5')
+var RIPEMD160 = require('ripemd160')
+var sha = require('sha.js')
 
-  // Step E
-  v = createHmac('sha256', k).update(v).digest()
+var Base = require('cipher-base')
 
-  // Step F
-  k = createHmac('sha256', k)
-    .update(v)
-    .update(ONE)
-    .update(x)
-    .update(hash)
-    .digest()
+function HashNoConstructor (hash) {
+  Base.call(this, 'digest')
 
-  // Step G
-  v = createHmac('sha256', k).update(v).digest()
+  this._hash = hash
+  this.buffers = []
+}
 
-  // Step H1/H2a, ignored as tlen === qlen (256 bit)
-  // Step H2b
-  v = createHmac('sha256', k).update(v).digest()
+inherits(HashNoConstructor, Base)
 
-  var T = BigInteger.fromBuffer(v)
+HashNoConstructor.prototype._update = function (data) {
+  this.buffers.push(data)
+}
 
-  // Step H3, repeat until T is within the interval [1, n - 1] and is suitable for ECDSA
-  while ((T.signum() <= 0) || (T.compareTo(curve.n) >= 0) || !checkSig(T)) {
-    k = createHmac('sha256', k)
-      .update(v)
-      .update(ZERO)
-      .digest()
+HashNoConstructor.prototype._final = function () {
+  var buf = Buffer.concat(this.buffers)
+  var r = this._hash(buf)
+  this.buffers = null
 
-    v = createHmac('sha256', k).update(v).digest()
+  return r
+}
 
-    // Step H1/H2a, again, ignored as tlen === qlen (256 bit)
-    // Step H2b again
-    v = createHmac('sha256', k).update(v).digest()
-    T = BigInteger.fromBuffer(v)
-  }
+function Hash (hash) {
+  Base.call(this, 'digest')
 
-  return T
+  this._hash = hash
 }
 
-function sign (curve, hash, d) {
-  var r, s
+inherits(Hash, Base)
 
-  var e = BigInteger.fromBuffer(hash)
-  var n = curve.n
-  var G = curve.G
+Hash.prototype._update = function (data) {
+  this._hash.update(data)
+}
 
-  deterministicGenerateK(curve, hash, d, function (k) {
-    var Q = G.multiply(k)
+Hash.prototype._final = function () {
+  return this._hash.digest()
+}
 
-    if (curve.isInfinity(Q))
-      return false
+module.exports = function createHash (alg) {
+  alg = alg.toLowerCase()
+  if (alg === 'md5') return new HashNoConstructor(md5)
+  if (alg === 'rmd160' || alg === 'ripemd160') return new Hash(new RIPEMD160())
 
-    r = Q.affineX.mod(n)
-    if (r.signum() === 0)
-      return false
+  return new Hash(sha(alg))
+}
 
-    s = k.modInverse(n).multiply(e.add(d.multiply(r))).mod(n)
-    if (s.signum() === 0)
-      return false
+}).call(this,require("buffer").Buffer)
+},{"./md5":84,"buffer":4,"cipher-base":81,"inherits":93,"ripemd160":97,"sha.js":100}],83:[function(require,module,exports){
+(function (Buffer){
+'use strict'
+var intSize = 4
+var zeroBuffer = new Buffer(intSize)
+zeroBuffer.fill(0)
 
-    return true
-  })
+var charSize = 8
+var hashSize = 16
 
-  var N_OVER_TWO = n.shiftRight(1)
+function toArray (buf) {
+  if ((buf.length % intSize) !== 0) {
+    var len = buf.length + (intSize - (buf.length % intSize))
+    buf = Buffer.concat([buf, zeroBuffer], len)
+  }
 
-  // enforce low S values, see bip62: 'low s values in signatures'
-  if (s.compareTo(N_OVER_TWO) > 0) {
-    s = n.subtract(s)
+  var arr = new Array(buf.length >>> 2)
+  for (var i = 0, j = 0; i < buf.length; i += intSize, j++) {
+    arr[j] = buf.readInt32LE(i)
   }
 
-  return new ECSignature(r, s)
+  return arr
 }
 
-function verifyRaw (curve, e, signature, Q) {
-  var n = curve.n
-  var G = curve.G
-
-  var r = signature.r
-  var s = signature.s
-
-  // 1.4.1 Enforce r and s are both integers in the interval [1, n − 1]
-  if (r.signum() <= 0 || r.compareTo(n) >= 0) return false
-  if (s.signum() <= 0 || s.compareTo(n) >= 0) return false
-
-  // c = s^-1 mod n
-  var c = s.modInverse(n)
-
-  // 1.4.4 Compute u1 = es^−1 mod n
-  //               u2 = rs^−1 mod n
-  var u1 = e.multiply(c).mod(n)
-  var u2 = r.multiply(c).mod(n)
+module.exports = function hash (buf, fn) {
+  var arr = fn(toArray(buf), buf.length * charSize)
+  buf = new Buffer(hashSize)
+  for (var i = 0; i < arr.length; i++) {
+    buf.writeInt32LE(arr[i], i << 2, true)
+  }
+  return buf
+}
 
-  // 1.4.5 Compute R = (xR, yR) = u1G + u2Q
-  var R = G.multiplyTwo(u1, Q, u2)
-  var v = R.affineX.mod(n)
+}).call(this,require("buffer").Buffer)
+},{"buffer":4}],84:[function(require,module,exports){
+'use strict'
+/*
+ * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
+ * Digest Algorithm, as defined in RFC 1321.
+ * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
+ * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+ * Distributed under the BSD License
+ * See http://pajhome.org.uk/crypt/md5 for more info.
+ */
 
-  // 1.4.5 (cont.) Enforce R is not at infinity
-  if (curve.isInfinity(R)) return false
+var makeHash = require('./make-hash')
 
-  // 1.4.8 If v = r, output "valid", and if v != r, output "invalid"
-  return v.equals(r)
+/*
+ * Calculate the MD5 of an array of little-endian words, and a bit length
+ */
+function core_md5 (x, len) {
+  /* append padding */
+  x[len >> 5] |= 0x80 << ((len) % 32)
+  x[(((len + 64) >>> 9) << 4) + 14] = len
+
+  var a = 1732584193
+  var b = -271733879
+  var c = -1732584194
+  var d = 271733878
+
+  for (var i = 0; i < x.length; i += 16) {
+    var olda = a
+    var oldb = b
+    var oldc = c
+    var oldd = d
+
+    a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
+    d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
+    c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
+    b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
+    a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
+    d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
+    c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
+    b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
+    a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
+    d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
+    c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
+    b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
+    a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
+    d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
+    c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
+    b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)
+
+    a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
+    d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
+    c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
+    b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
+    a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
+    d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
+    c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
+    b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
+    a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
+    d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
+    c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
+    b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
+    a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
+    d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
+    c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
+    b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)
+
+    a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
+    d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
+    c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
+    b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
+    a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
+    d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
+    c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
+    b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
+    a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
+    d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
+    c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
+    b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
+    a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
+    d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
+    c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
+    b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)
+
+    a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
+    d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
+    c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
+    b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
+    a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
+    d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
+    c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
+    b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
+    a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
+    d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
+    c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
+    b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
+    a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
+    d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
+    c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
+    b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)
+
+    a = safe_add(a, olda)
+    b = safe_add(b, oldb)
+    c = safe_add(c, oldc)
+    d = safe_add(d, oldd)
+  }
+
+  return [a, b, c, d]
 }
 
-function verify (curve, hash, signature, Q) {
-  // 1.4.2 H = Hash(M), already done by the user
-  // 1.4.3 e = H
-  var e = BigInteger.fromBuffer(hash)
+/*
+ * These functions implement the four basic operations the algorithm uses.
+ */
+function md5_cmn (q, a, b, x, s, t) {
+  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
+}
 
-  return verifyRaw(curve, e, signature, Q)
+function md5_ff (a, b, c, d, x, s, t) {
+  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
 }
 
-/**
-  * Recover a public key from a signature.
-  *
-  * See SEC 1: Elliptic Curve Cryptography, section 4.1.6, "Public
-  * Key Recovery Operation".
-  *
-  * http://www.secg.org/download/aid-780/sec1-v2.pdf
-  */
-function recoverPubKey (curve, e, signature, i) {
-  assert.strictEqual(i & 3, i, 'Recovery param is more than two bits')
+function md5_gg (a, b, c, d, x, s, t) {
+  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
+}
 
-  var n = curve.n
-  var G = curve.G
+function md5_hh (a, b, c, d, x, s, t) {
+  return md5_cmn(b ^ c ^ d, a, b, x, s, t)
+}
 
-  var r = signature.r
-  var s = signature.s
+function md5_ii (a, b, c, d, x, s, t) {
+  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
+}
 
-  assert(r.signum() > 0 && r.compareTo(n) < 0, 'Invalid r value')
-  assert(s.signum() > 0 && s.compareTo(n) < 0, 'Invalid s value')
+/*
+ * Add integers, wrapping at 2^32. This uses 16-bit operations internally
+ * to work around bugs in some JS interpreters.
+ */
+function safe_add (x, y) {
+  var lsw = (x & 0xFFFF) + (y & 0xFFFF)
+  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
+  return (msw << 16) | (lsw & 0xFFFF)
+}
 
-  // A set LSB signifies that the y-coordinate is odd
-  var isYOdd = i & 1
+/*
+ * Bitwise rotate a 32-bit number to the left.
+ */
+function bit_rol (num, cnt) {
+  return (num << cnt) | (num >>> (32 - cnt))
+}
 
-  // The more significant bit specifies whether we should use the
-  // first or second candidate key.
-  var isSecondKey = i >> 1
+module.exports = function md5 (buf) {
+  return makeHash(buf, core_md5)
+}
 
-  // 1.1 Let x = r + jn
-  var x = isSecondKey ? r.add(n) : r
-  var R = curve.pointFromX(isYOdd, x)
+},{"./make-hash":83}],85:[function(require,module,exports){
+'use strict'
+var inherits = require('inherits')
+var Legacy = require('./legacy')
+var Base = require('cipher-base')
+var Buffer = require('safe-buffer').Buffer
+var md5 = require('create-hash/md5')
+var RIPEMD160 = require('ripemd160')
 
-  // 1.4 Check that nR is at infinity
-  var nR = R.multiply(n)
-  assert(curve.isInfinity(nR), 'nR is not a valid curve point')
+var sha = require('sha.js')
 
-  // Compute -e from e
-  var eNeg = e.negate().mod(n)
+var ZEROS = Buffer.alloc(128)
 
-  // 1.6.1 Compute Q = r^-1 (sR -  eG)
-  //               Q = r^-1 (sR + -eG)
-  var rInv = r.modInverse(n)
+function Hmac (alg, key) {
+  Base.call(this, 'digest')
+  if (typeof key === 'string') {
+    key = Buffer.from(key)
+  }
 
-  var Q = R.multiplyTwo(s, G, eNeg).multiply(rInv)
-  curve.validate(Q)
+  var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64
 
-  return Q
-}
+  this._alg = alg
+  this._key = key
+  if (key.length > blocksize) {
+    var hash = alg === 'rmd160' ? new RIPEMD160() : sha(alg)
+    key = hash.update(key).digest()
+  } else if (key.length < blocksize) {
+    key = Buffer.concat([key, ZEROS], blocksize)
+  }
 
-/**
-  * Calculate pubkey extraction parameter.
-  *
-  * When extracting a pubkey from a signature, we have to
-  * distinguish four different cases. Rather than putting this
-  * burden on the verifier, Bitcoin includes a 2-bit value with the
-  * signature.
-  *
-  * This function simply tries all four cases and returns the value
-  * that resulted in a successful pubkey recovery.
-  */
-function calcPubKeyRecoveryParam (curve, e, signature, Q) {
-  for (var i = 0; i < 4; i++) {
-    var Qprime = recoverPubKey(curve, e, signature, i)
+  var ipad = this._ipad = Buffer.allocUnsafe(blocksize)
+  var opad = this._opad = Buffer.allocUnsafe(blocksize)
 
-    // 1.6.2 Verify Q
-    if (Qprime.equals(Q)) {
-      return i
-    }
+  for (var i = 0; i < blocksize; i++) {
+    ipad[i] = key[i] ^ 0x36
+    opad[i] = key[i] ^ 0x5C
   }
+  this._hash = alg === 'rmd160' ? new RIPEMD160() : sha(alg)
+  this._hash.update(ipad)
+}
+
+inherits(Hmac, Base)
 
-  throw new Error('Unable to find valid recovery factor')
+Hmac.prototype._update = function (data) {
+  this._hash.update(data)
 }
 
-module.exports = {
-  calcPubKeyRecoveryParam: calcPubKeyRecoveryParam,
-  deterministicGenerateK: deterministicGenerateK,
-  recoverPubKey: recoverPubKey,
-  sign: sign,
-  verify: verify,
-  verifyRaw: verifyRaw
+Hmac.prototype._final = function () {
+  var h = this._hash.digest()
+  var hash = this._alg === 'rmd160' ? new RIPEMD160() : sha(this._alg)
+  return hash.update(this._opad).update(h).digest()
 }
 
-}).call(this,require("buffer").Buffer)
-},{"./ecsignature":62,"assert":5,"bigi":3,"buffer":7,"create-hmac":45,"typeforce":53}],60:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var base58check = require('bs58check')
-var ecdsa = require('./ecdsa')
-var networks = require('./networks')
-var randomBytes = require('randombytes')
-var typeForce = require('typeforce')
+module.exports = function createHmac (alg, key) {
+  alg = alg.toLowerCase()
+  if (alg === 'rmd160' || alg === 'ripemd160') {
+    return new Hmac('rmd160', key)
+  }
+  if (alg === 'md5') {
+    return new Legacy(md5, key)
+  }
+  return new Hmac(alg, key)
+}
 
-var BigInteger = require('bigi')
-var ECPubKey = require('./ecpubkey')
+},{"./legacy":86,"cipher-base":81,"create-hash/md5":84,"inherits":93,"ripemd160":97,"safe-buffer":98,"sha.js":100}],86:[function(require,module,exports){
+'use strict'
+var inherits = require('inherits')
+var Buffer = require('safe-buffer').Buffer
 
-var ecurve = require('ecurve')
-var secp256k1 = ecurve.getCurveByName('secp256k1')
+var Base = require('cipher-base')
 
-function ECKey (d, compressed) {
-  assert(d.signum() > 0, 'Private key must be greater than 0')
-  assert(d.compareTo(ECKey.curve.n) < 0, 'Private key must be less than the curve order')
+var ZEROS = Buffer.alloc(128)
+var blocksize = 64
 
-  var Q = ECKey.curve.G.multiply(d)
+function Hmac (alg, key) {
+  Base.call(this, 'digest')
+  if (typeof key === 'string') {
+    key = Buffer.from(key)
+  }
 
-  this.d = d
-  this.pub = new ECPubKey(Q, compressed)
-}
+  this._alg = alg
+  this._key = key
 
-// Constants
-ECKey.curve = secp256k1
+  if (key.length > blocksize) {
+    key = alg(key)
+  } else if (key.length < blocksize) {
+    key = Buffer.concat([key, ZEROS], blocksize)
+  }
 
-// Static constructors
-ECKey.fromWIF = function (string) {
-  var payload = base58check.decode(string)
-  var compressed = false
+  var ipad = this._ipad = Buffer.allocUnsafe(blocksize)
+  var opad = this._opad = Buffer.allocUnsafe(blocksize)
 
-  // Ignore the version byte
-  payload = payload.slice(1)
+  for (var i = 0; i < blocksize; i++) {
+    ipad[i] = key[i] ^ 0x36
+    opad[i] = key[i] ^ 0x5C
+  }
 
-  if (payload.length === 33) {
-    assert.strictEqual(payload[32], 0x01, 'Invalid compression flag')
+  this._hash = [ipad]
+}
 
-    // Truncate the compression flag
-    payload = payload.slice(0, -1)
-    compressed = true
-  }
+inherits(Hmac, Base)
 
-  assert.equal(payload.length, 32, 'Invalid WIF payload length')
+Hmac.prototype._update = function (data) {
+  this._hash.push(data)
+}
 
-  var d = BigInteger.fromBuffer(payload)
-  return new ECKey(d, compressed)
+Hmac.prototype._final = function () {
+  var h = this._alg(Buffer.concat(this._hash))
+  return this._alg(Buffer.concat([this._opad, h]))
 }
+module.exports = Hmac
 
-ECKey.makeRandom = function (compressed, rng) {
-  rng = rng || randomBytes
+},{"cipher-base":81,"inherits":93,"safe-buffer":98}],87:[function(require,module,exports){
+var assert = require('assert')
+var BigInteger = require('bigi')
 
-  var buffer = rng(32)
-  typeForce('Buffer', buffer)
-  assert.equal(buffer.length, 32, 'Expected 256-bit Buffer from RNG')
+var Point = require('./point')
 
-  var d = BigInteger.fromBuffer(buffer)
-  d = d.mod(ECKey.curve.n)
+function Curve (p, a, b, Gx, Gy, n, h) {
+  this.p = p
+  this.a = a
+  this.b = b
+  this.G = Point.fromAffine(this, Gx, Gy)
+  this.n = n
+  this.h = h
 
-  return new ECKey(d, compressed)
-}
+  this.infinity = new Point(this, null, null, BigInteger.ZERO)
 
-// Export functions
-ECKey.prototype.toWIF = function (network) {
-  network = network || networks.bitcoin
+  // result caching
+  this.pOverFour = p.add(BigInteger.ONE).shiftRight(2)
 
-  var bufferLen = this.pub.compressed ? 34 : 33
-  var buffer = new Buffer(bufferLen)
+  // determine size of p in bytes
+  this.pLength = Math.floor((this.p.bitLength() + 7) / 8)
+}
 
-  buffer.writeUInt8(network.wif, 0)
-  this.d.toBuffer(32).copy(buffer, 1)
+Curve.prototype.pointFromX = function (isOdd, x) {
+  var alpha = x.pow(3).add(this.a.multiply(x)).add(this.b).mod(this.p)
+  var beta = alpha.modPow(this.pOverFour, this.p) // XXX: not compatible with all curves
 
-  if (this.pub.compressed) {
-    buffer.writeUInt8(0x01, 33)
+  var y = beta
+  if (beta.isEven() ^ !isOdd) {
+    y = this.p.subtract(y) // -y % p
   }
 
-  return base58check.encode(buffer)
+  return Point.fromAffine(this, x, y)
 }
 
-// Operations
-ECKey.prototype.sign = function (hash) {
-  return ecdsa.sign(ECKey.curve, hash, this.d)
+Curve.prototype.isInfinity = function (Q) {
+  if (Q === this.infinity) return true
+
+  return Q.z.signum() === 0 && Q.y.signum() !== 0
 }
 
-module.exports = ECKey
+Curve.prototype.isOnCurve = function (Q) {
+  if (this.isInfinity(Q)) return true
 
-}).call(this,require("buffer").Buffer)
-},{"./ecdsa":59,"./ecpubkey":61,"./networks":66,"assert":5,"bigi":3,"bs58check":31,"buffer":7,"ecurve":49,"randombytes":52,"typeforce":53}],61:[function(require,module,exports){
-(function (Buffer){
-var crypto = require('./crypto')
-var ecdsa = require('./ecdsa')
-var typeForce = require('typeforce')
-var networks = require('./networks')
+  var x = Q.affineX
+  var y = Q.affineY
+  var a = this.a
+  var b = this.b
+  var p = this.p
 
-var Address = require('./address')
+  // Check that xQ and yQ are integers in the interval [0, p - 1]
+  if (x.signum() < 0 || x.compareTo(p) >= 0) return false
+  if (y.signum() < 0 || y.compareTo(p) >= 0) return false
 
-var ecurve = require('ecurve')
-var secp256k1 = ecurve.getCurveByName('secp256k1')
+  // and check that y^2 = x^3 + ax + b (mod p)
+  var lhs = y.square().mod(p)
+  var rhs = x.pow(3).add(a.multiply(x)).add(b).mod(p)
+  return lhs.equals(rhs)
+}
 
-function ECPubKey (Q, compressed) {
-  if (compressed === undefined) {
-    compressed = true
-  }
+/**
+ * Validate an elliptic curve point.
+ *
+ * See SEC 1, section 3.2.2.1: Elliptic Curve Public Key Validation Primitive
+ */
+Curve.prototype.validate = function (Q) {
+  // Check Q != O
+  assert(!this.isInfinity(Q), 'Point is at infinity')
+  assert(this.isOnCurve(Q), 'Point is not on the curve')
 
-  typeForce('Point', Q)
-  typeForce('Boolean', compressed)
+  // Check nQ = O (where Q is a scalar multiple of G)
+  var nQ = Q.multiply(this.n)
+  assert(this.isInfinity(nQ), 'Point is not a scalar multiple of G')
 
-  this.compressed = compressed
-  this.Q = Q
+  return true
 }
 
-// Constants
-ECPubKey.curve = secp256k1
+module.exports = Curve
 
-// Static constructors
-ECPubKey.fromBuffer = function (buffer) {
-  var Q = ecurve.Point.decodeFrom(ECPubKey.curve, buffer)
-  return new ECPubKey(Q, Q.compressed)
+},{"./point":91,"assert":1,"bigi":37}],88:[function(require,module,exports){
+module.exports={
+  "secp128r1": {
+    "p": "fffffffdffffffffffffffffffffffff",
+    "a": "fffffffdfffffffffffffffffffffffc",
+    "b": "e87579c11079f43dd824993c2cee5ed3",
+    "n": "fffffffe0000000075a30d1b9038a115",
+    "h": "01",
+    "Gx": "161ff7528b899b2d0c28607ca52c5b86",
+    "Gy": "cf5ac8395bafeb13c02da292dded7a83"
+  },
+  "secp160k1": {
+    "p": "fffffffffffffffffffffffffffffffeffffac73",
+    "a": "00",
+    "b": "07",
+    "n": "0100000000000000000001b8fa16dfab9aca16b6b3",
+    "h": "01",
+    "Gx": "3b4c382ce37aa192a4019e763036f4f5dd4d7ebb",
+    "Gy": "938cf935318fdced6bc28286531733c3f03c4fee"
+  },
+  "secp160r1": {
+    "p": "ffffffffffffffffffffffffffffffff7fffffff",
+    "a": "ffffffffffffffffffffffffffffffff7ffffffc",
+    "b": "1c97befc54bd7a8b65acf89f81d4d4adc565fa45",
+    "n": "0100000000000000000001f4c8f927aed3ca752257",
+    "h": "01",
+    "Gx": "4a96b5688ef573284664698968c38bb913cbfc82",
+    "Gy": "23a628553168947d59dcc912042351377ac5fb32"
+  },
+  "secp192k1": {
+    "p": "fffffffffffffffffffffffffffffffffffffffeffffee37",
+    "a": "00",
+    "b": "03",
+    "n": "fffffffffffffffffffffffe26f2fc170f69466a74defd8d",
+    "h": "01",
+    "Gx": "db4ff10ec057e9ae26b07d0280b7f4341da5d1b1eae06c7d",
+    "Gy": "9b2f2f6d9c5628a7844163d015be86344082aa88d95e2f9d"
+  },
+  "secp192r1": {
+    "p": "fffffffffffffffffffffffffffffffeffffffffffffffff",
+    "a": "fffffffffffffffffffffffffffffffefffffffffffffffc",
+    "b": "64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1",
+    "n": "ffffffffffffffffffffffff99def836146bc9b1b4d22831",
+    "h": "01",
+    "Gx": "188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012",
+    "Gy": "07192b95ffc8da78631011ed6b24cdd573f977a11e794811"
+  },
+  "secp256k1": {
+    "p": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
+    "a": "00",
+    "b": "07",
+    "n": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
+    "h": "01",
+    "Gx": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
+    "Gy": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
+  },
+  "secp256r1": {
+    "p": "ffffffff00000001000000000000000000000000ffffffffffffffffffffffff",
+    "a": "ffffffff00000001000000000000000000000000fffffffffffffffffffffffc",
+    "b": "5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b",
+    "n": "ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",
+    "h": "01",
+    "Gx": "6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",
+    "Gy": "4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5"
+  }
 }
 
-ECPubKey.fromHex = function (hex) {
-  return ECPubKey.fromBuffer(new Buffer(hex, 'hex'))
-}
+},{}],89:[function(require,module,exports){
+var Point = require('./point')
+var Curve = require('./curve')
 
-// Operations
-ECPubKey.prototype.getAddress = function (network) {
-  network = network || networks.bitcoin
+var getCurveByName = require('./names')
 
-  return new Address(crypto.hash160(this.toBuffer()), network.pubKeyHash)
+module.exports = {
+  Curve: Curve,
+  Point: Point,
+  getCurveByName: getCurveByName
 }
 
-ECPubKey.prototype.verify = function (hash, signature) {
-  return ecdsa.verify(ECPubKey.curve, hash, signature, this.Q)
-}
+},{"./curve":87,"./names":90,"./point":91}],90:[function(require,module,exports){
+var BigInteger = require('bigi')
 
-// Export functions
-ECPubKey.prototype.toBuffer = function () {
-  return this.Q.getEncoded(this.compressed)
-}
+var curves = require('./curves.json')
+var Curve = require('./curve')
 
-ECPubKey.prototype.toHex = function () {
-  return this.toBuffer().toString('hex')
+function getCurveByName (name) {
+  var curve = curves[name]
+  if (!curve) return null
+
+  var p = new BigInteger(curve.p, 16)
+  var a = new BigInteger(curve.a, 16)
+  var b = new BigInteger(curve.b, 16)
+  var n = new BigInteger(curve.n, 16)
+  var h = new BigInteger(curve.h, 16)
+  var Gx = new BigInteger(curve.Gx, 16)
+  var Gy = new BigInteger(curve.Gy, 16)
+
+  return new Curve(p, a, b, Gx, Gy, n, h)
 }
 
-module.exports = ECPubKey
+module.exports = getCurveByName
 
-}).call(this,require("buffer").Buffer)
-},{"./address":54,"./crypto":58,"./ecdsa":59,"./networks":66,"buffer":7,"ecurve":49,"typeforce":53}],62:[function(require,module,exports){
+},{"./curve":87,"./curves.json":88,"bigi":37}],91:[function(require,module,exports){
 (function (Buffer){
 var assert = require('assert')
-var typeForce = require('typeforce')
-
 var BigInteger = require('bigi')
 
-function ECSignature (r, s) {
-  typeForce('BigInteger', r)
-  typeForce('BigInteger', s)
-
-  this.r = r
-  this.s = s
-}
+var THREE = BigInteger.valueOf(3)
 
-ECSignature.parseCompact = function (buffer) {
-  assert.equal(buffer.length, 65, 'Invalid signature length')
-  var i = buffer.readUInt8(0) - 27
+function Point (curve, x, y, z) {
+  assert.notStrictEqual(z, undefined, 'Missing Z coordinate')
 
-  // At most 3 bits
-  assert.equal(i, i & 7, 'Invalid signature parameter')
-  var compressed = !!(i & 4)
+  this.curve = curve
+  this.x = x
+  this.y = y
+  this.z = z
+  this._zInv = null
 
-  // Recovery param only
-  i = i & 3
+  this.compressed = true
+}
 
-  var r = BigInteger.fromBuffer(buffer.slice(1, 33))
-  var s = BigInteger.fromBuffer(buffer.slice(33))
+Object.defineProperty(Point.prototype, 'zInv', {
+  get: function () {
+    if (this._zInv === null) {
+      this._zInv = this.z.modInverse(this.curve.p)
+    }
 
-  return {
-    compressed: compressed,
-    i: i,
-    signature: new ECSignature(r, s)
+    return this._zInv
   }
-}
+})
 
-ECSignature.fromDER = function (buffer) {
-  assert.equal(buffer.readUInt8(0), 0x30, 'Not a DER sequence')
-  assert.equal(buffer.readUInt8(1), buffer.length - 2, 'Invalid sequence length')
-  assert.equal(buffer.readUInt8(2), 0x02, 'Expected a DER integer')
+Object.defineProperty(Point.prototype, 'affineX', {
+  get: function () {
+    return this.x.multiply(this.zInv).mod(this.curve.p)
+  }
+})
 
-  var rLen = buffer.readUInt8(3)
-  assert(rLen > 0, 'R length is zero')
+Object.defineProperty(Point.prototype, 'affineY', {
+  get: function () {
+    return this.y.multiply(this.zInv).mod(this.curve.p)
+  }
+})
 
-  var offset = 4 + rLen
-  assert.equal(buffer.readUInt8(offset), 0x02, 'Expected a DER integer (2)')
+Point.fromAffine = function (curve, x, y) {
+  return new Point(curve, x, y, BigInteger.ONE)
+}
 
-  var sLen = buffer.readUInt8(offset + 1)
-  assert(sLen > 0, 'S length is zero')
+Point.prototype.equals = function (other) {
+  if (other === this) return true
+  if (this.curve.isInfinity(this)) return this.curve.isInfinity(other)
+  if (this.curve.isInfinity(other)) return this.curve.isInfinity(this)
 
-  var rB = buffer.slice(4, offset)
-  var sB = buffer.slice(offset + 2)
-  offset += 2 + sLen
+  // u = Y2 * Z1 - Y1 * Z2
+  var u = other.y.multiply(this.z).subtract(this.y.multiply(other.z)).mod(this.curve.p)
 
-  if (rLen > 1 && rB.readUInt8(0) === 0x00) {
-    assert(rB.readUInt8(1) & 0x80, 'R value excessively padded')
-  }
+  if (u.signum() !== 0) return false
 
-  if (sLen > 1 && sB.readUInt8(0) === 0x00) {
-    assert(sB.readUInt8(1) & 0x80, 'S value excessively padded')
-  }
+  // v = X2 * Z1 - X1 * Z2
+  var v = other.x.multiply(this.z).subtract(this.x.multiply(other.z)).mod(this.curve.p)
 
-  assert.equal(offset, buffer.length, 'Invalid DER encoding')
-  var r = BigInteger.fromDERInteger(rB)
-  var s = BigInteger.fromDERInteger(sB)
+  return v.signum() === 0
+}
 
-  assert(r.signum() >= 0, 'R value is negative')
-  assert(s.signum() >= 0, 'S value is negative')
+Point.prototype.negate = function () {
+  var y = this.curve.p.subtract(this.y)
 
-  return new ECSignature(r, s)
+  return new Point(this.curve, this.x, y, this.z)
 }
 
-// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
-ECSignature.parseScriptSignature = function (buffer) {
-  var hashType = buffer.readUInt8(buffer.length - 1)
-  var hashTypeMod = hashType & ~0x80
+Point.prototype.add = function (b) {
+  if (this.curve.isInfinity(this)) return b
+  if (this.curve.isInfinity(b)) return this
+
+  var x1 = this.x
+  var y1 = this.y
+  var x2 = b.x
+  var y2 = b.y
 
-  assert(hashTypeMod > 0x00 && hashTypeMod < 0x04, 'Invalid hashType ' + hashType)
+  // u = Y2 * Z1 - Y1 * Z2
+  var u = y2.multiply(this.z).subtract(y1.multiply(b.z)).mod(this.curve.p)
+  // v = X2 * Z1 - X1 * Z2
+  var v = x2.multiply(this.z).subtract(x1.multiply(b.z)).mod(this.curve.p)
 
-  return {
-    signature: ECSignature.fromDER(buffer.slice(0, -1)),
-    hashType: hashType
-  }
-}
+  if (v.signum() === 0) {
+    if (u.signum() === 0) {
+      return this.twice() // this == b, so double
+    }
 
-ECSignature.prototype.toCompact = function (i, compressed) {
-  if (compressed) {
-    i += 4
+    return this.curve.infinity // this = -b, so infinity
   }
 
-  i += 27
-
-  var buffer = new Buffer(65)
-  buffer.writeUInt8(i, 0)
+  var v2 = v.square()
+  var v3 = v2.multiply(v)
+  var x1v2 = x1.multiply(v2)
+  var zu2 = u.square().multiply(this.z)
 
-  this.r.toBuffer(32).copy(buffer, 1)
-  this.s.toBuffer(32).copy(buffer, 33)
+  // x3 = v * (z2 * (z1 * u^2 - 2 * x1 * v^2) - v^3)
+  var x3 = zu2.subtract(x1v2.shiftLeft(1)).multiply(b.z).subtract(v3).multiply(v).mod(this.curve.p)
+  // y3 = z2 * (3 * x1 * u * v^2 - y1 * v^3 - z1 * u^3) + u * v^3
+  var y3 = x1v2.multiply(THREE).multiply(u).subtract(y1.multiply(v3)).subtract(zu2.multiply(u)).multiply(b.z).add(u.multiply(v3)).mod(this.curve.p)
+  // z3 = v^3 * z1 * z2
+  var z3 = v3.multiply(this.z).multiply(b.z).mod(this.curve.p)
 
-  return buffer
+  return new Point(this.curve, x3, y3, z3)
 }
 
-ECSignature.prototype.toDER = function () {
-  var rBa = this.r.toDERInteger()
-  var sBa = this.s.toDERInteger()
-
-  var sequence = []
-
-  // INTEGER
-  sequence.push(0x02, rBa.length)
-  sequence = sequence.concat(rBa)
+Point.prototype.twice = function () {
+  if (this.curve.isInfinity(this)) return this
+  if (this.y.signum() === 0) return this.curve.infinity
 
-  // INTEGER
-  sequence.push(0x02, sBa.length)
-  sequence = sequence.concat(sBa)
+  var x1 = this.x
+  var y1 = this.y
 
-  // SEQUENCE
-  sequence.unshift(0x30, sequence.length)
+  var y1z1 = y1.multiply(this.z).mod(this.curve.p)
+  var y1sqz1 = y1z1.multiply(y1).mod(this.curve.p)
+  var a = this.curve.a
 
-  return new Buffer(sequence)
-}
+  // w = 3 * x1^2 + a * z1^2
+  var w = x1.square().multiply(THREE)
 
-ECSignature.prototype.toScriptSignature = function (hashType) {
-  var hashTypeMod = hashType & ~0x80
-  assert(hashTypeMod > 0x00 && hashTypeMod < 0x04, 'Invalid hashType ' + hashType)
+  if (a.signum() !== 0) {
+    w = w.add(this.z.square().multiply(a))
+  }
 
-  var hashTypeBuffer = new Buffer(1)
-  hashTypeBuffer.writeUInt8(hashType, 0)
+  w = w.mod(this.curve.p)
+  // x3 = 2 * y1 * z1 * (w^2 - 8 * x1 * y1^2 * z1)
+  var x3 = w.square().subtract(x1.shiftLeft(3).multiply(y1sqz1)).shiftLeft(1).multiply(y1z1).mod(this.curve.p)
+  // y3 = 4 * y1^2 * z1 * (3 * w * x1 - 2 * y1^2 * z1) - w^3
+  var y3 = w.multiply(THREE).multiply(x1).subtract(y1sqz1.shiftLeft(1)).shiftLeft(2).multiply(y1sqz1).subtract(w.pow(3)).mod(this.curve.p)
+  // z3 = 8 * (y1 * z1)^3
+  var z3 = y1z1.pow(3).shiftLeft(3).mod(this.curve.p)
 
-  return Buffer.concat([this.toDER(), hashTypeBuffer])
+  return new Point(this.curve, x3, y3, z3)
 }
 
-module.exports = ECSignature
+// Simple NAF (Non-Adjacent Form) multiplication algorithm
+// TODO: modularize the multiplication algorithm
+Point.prototype.multiply = function (k) {
+  if (this.curve.isInfinity(this)) return this
+  if (k.signum() === 0) return this.curve.infinity
 
-}).call(this,require("buffer").Buffer)
-},{"assert":5,"bigi":3,"buffer":7,"typeforce":53}],63:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var base58check = require('bs58check')
-var bcrypto = require('./crypto')
-var createHmac = require('create-hmac')
-var typeForce = require('typeforce')
-var networks = require('./networks')
+  var e = k
+  var h = e.multiply(THREE)
 
-var BigInteger = require('bigi')
-var ECKey = require('./eckey')
-var ECPubKey = require('./ecpubkey')
+  var neg = this.negate()
+  var R = this
 
-var ecurve = require('ecurve')
-var curve = ecurve.getCurveByName('secp256k1')
+  for (var i = h.bitLength() - 2; i > 0; --i) {
+    var hBit = h.testBit(i)
+    var eBit = e.testBit(i)
 
-function findBIP32NetworkByVersion (version) {
-  for (var name in networks) {
-    var network = networks[name]
+    R = R.twice()
 
-    if (version === network.bip32.private || version === network.bip32.public) {
-      return network
+    if (hBit !== eBit) {
+      R = R.add(hBit ? this : neg)
     }
   }
 
-  assert(false, 'Could not find network for ' + version.toString(16))
+  return R
 }
 
-function HDNode (K, chainCode, network) {
-  network = network || networks.bitcoin
+// Compute this*j + x*k (simultaneous multiplication)
+Point.prototype.multiplyTwo = function (j, x, k) {
+  var i = Math.max(j.bitLength(), k.bitLength()) - 1
+  var R = this.curve.infinity
+  var both = this.add(x)
 
-  typeForce('Buffer', chainCode)
+  while (i >= 0) {
+    var jBit = j.testBit(i)
+    var kBit = k.testBit(i)
 
-  assert.equal(chainCode.length, 32, 'Expected chainCode length of 32, got ' + chainCode.length)
-  assert(network.bip32, 'Unknown BIP32 constants for network')
+    R = R.twice()
 
-  this.chainCode = chainCode
-  this.depth = 0
-  this.index = 0
-  this.parentFingerprint = 0x00000000
-  this.network = network
-
-  if (K instanceof BigInteger) {
-    this.privKey = new ECKey(K, true)
-    this.pubKey = this.privKey.pub
-  } else if (K instanceof ECKey) {
-    assert(K.pub.compressed, 'ECKey must be compressed')
-    this.privKey = K
-    this.pubKey = K.pub
-  } else if (K instanceof ECPubKey) {
-    assert(K.compressed, 'ECPubKey must be compressed')
-    this.pubKey = K
-  } else {
-    this.pubKey = new ECPubKey(K, true)
+    if (jBit) {
+      if (kBit) {
+        R = R.add(both)
+      } else {
+        R = R.add(this)
+      }
+    } else if (kBit) {
+      R = R.add(x)
+    }
+    --i
   }
-}
 
-HDNode.MASTER_SECRET = new Buffer('Bitcoin seed')
-HDNode.HIGHEST_BIT = 0x80000000
-HDNode.LENGTH = 78
+  return R
+}
 
-HDNode.fromSeedBuffer = function (seed, network) {
-  typeForce('Buffer', seed)
+Point.prototype.getEncoded = function (compressed) {
+  if (compressed == null) compressed = this.compressed
+  if (this.curve.isInfinity(this)) return new Buffer('00', 'hex') // Infinity point encoded is simply '00'
 
-  assert(seed.length >= 16, 'Seed should be at least 128 bits')
-  assert(seed.length <= 64, 'Seed should be at most 512 bits')
+  var x = this.affineX
+  var y = this.affineY
+  var byteLength = this.curve.pLength
+  var buffer
 
-  var I = createHmac('sha512', HDNode.MASTER_SECRET).update(seed).digest()
-  var IL = I.slice(0, 32)
-  var IR = I.slice(32)
+  // 0x02/0x03 | X
+  if (compressed) {
+    buffer = new Buffer(1 + byteLength)
+    buffer.writeUInt8(y.isEven() ? 0x02 : 0x03, 0)
 
-  // In case IL is 0 or >= n, the master key is invalid
-  // This is handled by `new ECKey` in the HDNode constructor
-  var pIL = BigInteger.fromBuffer(IL)
+  // 0x04 | X | Y
+  } else {
+    buffer = new Buffer(1 + byteLength + byteLength)
+    buffer.writeUInt8(0x04, 0)
 
-  return new HDNode(pIL, IR, network)
-}
+    y.toBuffer(byteLength).copy(buffer, 1 + byteLength)
+  }
 
-HDNode.fromSeedHex = function (hex, network) {
-  return HDNode.fromSeedBuffer(new Buffer(hex, 'hex'), network)
-}
+  x.toBuffer(byteLength).copy(buffer, 1)
 
-HDNode.fromBase58 = function (string, network) {
-  return HDNode.fromBuffer(base58check.decode(string), network, true)
+  return buffer
 }
 
-// FIXME: remove in 2.x.y
-HDNode.fromBuffer = function (buffer, network, __ignoreDeprecation) {
-  if (!__ignoreDeprecation) {
-    console.warn('HDNode.fromBuffer() is deprecated for removal in 2.x.y, use fromBase58 instead')
-  }
-
-  assert.strictEqual(buffer.length, HDNode.LENGTH, 'Invalid buffer length')
+Point.decodeFrom = function (curve, buffer) {
+  var type = buffer.readUInt8(0)
+  var compressed = (type !== 4)
 
-  // 4 byte: version bytes
-  var version = buffer.readUInt32BE(0)
+  var byteLength = Math.floor((curve.p.bitLength() + 7) / 8)
+  var x = BigInteger.fromBuffer(buffer.slice(1, 1 + byteLength))
 
-  if (network) {
-    assert(version === network.bip32.private || version === network.bip32.public, "Network doesn't match")
+  var Q
+  if (compressed) {
+    assert.equal(buffer.length, byteLength + 1, 'Invalid sequence length')
+    assert(type === 0x02 || type === 0x03, 'Invalid sequence tag')
 
-  // auto-detect
+    var isOdd = (type === 0x03)
+    Q = curve.pointFromX(isOdd, x)
   } else {
-    network = findBIP32NetworkByVersion(version)
-  }
-
-  // 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ...
-  var depth = buffer.readUInt8(4)
+    assert.equal(buffer.length, 1 + byteLength + byteLength, 'Invalid sequence length')
 
-  // 4 bytes: the fingerprint of the parent's key (0x00000000 if master key)
-  var parentFingerprint = buffer.readUInt32BE(5)
-  if (depth === 0) {
-    assert.strictEqual(parentFingerprint, 0x00000000, 'Invalid parent fingerprint')
+    var y = BigInteger.fromBuffer(buffer.slice(1 + byteLength))
+    Q = Point.fromAffine(curve, x, y)
   }
 
-  // 4 bytes: child number. This is the number i in xi = xpar/i, with xi the key being serialized.
-  // This is encoded in MSB order. (0x00000000 if master key)
-  var index = buffer.readUInt32BE(9)
-  assert(depth > 0 || index === 0, 'Invalid index')
+  Q.compressed = compressed
+  return Q
+}
 
-  // 32 bytes: the chain code
-  var chainCode = buffer.slice(13, 45)
-  var data, hd
+Point.prototype.toString = function () {
+  if (this.curve.isInfinity(this)) return '(INFINITY)'
 
-  // 33 bytes: private key data (0x00 + k)
-  if (version === network.bip32.private) {
-    assert.strictEqual(buffer.readUInt8(45), 0x00, 'Invalid private key')
-    data = buffer.slice(46, 78)
-    var d = BigInteger.fromBuffer(data)
-    hd = new HDNode(d, chainCode, network)
+  return '(' + this.affineX.toString() + ',' + this.affineY.toString() + ')'
+}
 
-  // 33 bytes: public key data (0x02 + X or 0x03 + X)
-  } else {
-    data = buffer.slice(45, 78)
-    var Q = ecurve.Point.decodeFrom(curve, data)
-    assert.equal(Q.compressed, true, 'Invalid public key')
+module.exports = Point
 
-    // Verify that the X coordinate in the public point corresponds to a point on the curve.
-    // If not, the extended public key is invalid.
-    curve.validate(Q)
+}).call(this,require("buffer").Buffer)
+},{"assert":1,"bigi":37,"buffer":4}],92:[function(require,module,exports){
+(function (Buffer){
+'use strict'
+var Transform = require('stream').Transform
+var inherits = require('inherits')
 
-    hd = new HDNode(Q, chainCode, network)
-  }
+function HashBase (blockSize) {
+  Transform.call(this)
 
-  hd.depth = depth
-  hd.index = index
-  hd.parentFingerprint = parentFingerprint
+  this._block = new Buffer(blockSize)
+  this._blockSize = blockSize
+  this._blockOffset = 0
+  this._length = [0, 0, 0, 0]
 
-  return hd
+  this._finalized = false
 }
 
-// FIXME: remove in 2.x.y
-HDNode.fromHex = function (hex, network) {
-  return HDNode.fromBuffer(new Buffer(hex, 'hex'), network)
-}
+inherits(HashBase, Transform)
 
-HDNode.prototype.getIdentifier = function () {
-  return bcrypto.hash160(this.pubKey.toBuffer())
-}
+HashBase.prototype._transform = function (chunk, encoding, callback) {
+  var error = null
+  try {
+    if (encoding !== 'buffer') chunk = new Buffer(chunk, encoding)
+    this.update(chunk)
+  } catch (err) {
+    error = err
+  }
 
-HDNode.prototype.getFingerprint = function () {
-  return this.getIdentifier().slice(0, 4)
+  callback(error)
 }
 
-HDNode.prototype.getAddress = function () {
-  return this.pubKey.getAddress(this.network)
+HashBase.prototype._flush = function (callback) {
+  var error = null
+  try {
+    this.push(this._digest())
+  } catch (err) {
+    error = err
+  }
+
+  callback(error)
 }
 
-HDNode.prototype.neutered = function () {
-  var neutered = new HDNode(this.pubKey.Q, this.chainCode, this.network)
-  neutered.depth = this.depth
-  neutered.index = this.index
-  neutered.parentFingerprint = this.parentFingerprint
+HashBase.prototype.update = function (data, encoding) {
+  if (!Buffer.isBuffer(data) && typeof data !== 'string') throw new TypeError('Data must be a string or a buffer')
+  if (this._finalized) throw new Error('Digest already called')
+  if (!Buffer.isBuffer(data)) data = new Buffer(data, encoding || 'binary')
 
-  return neutered
-}
+  // consume data
+  var block = this._block
+  var offset = 0
+  while (this._blockOffset + data.length - offset >= this._blockSize) {
+    for (var i = this._blockOffset; i < this._blockSize;) block[i++] = data[offset++]
+    this._update()
+    this._blockOffset = 0
+  }
+  while (offset < data.length) block[this._blockOffset++] = data[offset++]
+
+  // update length
+  for (var j = 0, carry = data.length * 8; carry > 0; ++j) {
+    this._length[j] += carry
+    carry = (this._length[j] / 0x0100000000) | 0
+    if (carry > 0) this._length[j] -= 0x0100000000 * carry
+  }
 
-HDNode.prototype.toBase58 = function (isPrivate) {
-  return base58check.encode(this.toBuffer(isPrivate, true))
+  return this
 }
 
-// FIXME: remove in 2.x.y
-HDNode.prototype.toBuffer = function (isPrivate, __ignoreDeprecation) {
-  if (isPrivate === undefined) {
-    isPrivate = !!this.privKey
+HashBase.prototype._update = function (data) {
+  throw new Error('_update is not implemented')
+}
 
-  // FIXME: remove in 2.x.y
-  } else {
-    console.warn('isPrivate flag is deprecated, please use the .neutered() method instead')
-  }
+HashBase.prototype.digest = function (encoding) {
+  if (this._finalized) throw new Error('Digest already called')
+  this._finalized = true
 
-  if (!__ignoreDeprecation) {
-    console.warn('HDNode.toBuffer() is deprecated for removal in 2.x.y, use toBase58 instead')
-  }
+  var digest = this._digest()
+  if (encoding !== undefined) digest = digest.toString(encoding)
+  return digest
+}
 
-  // Version
-  var version = isPrivate ? this.network.bip32.private : this.network.bip32.public
-  var buffer = new Buffer(HDNode.LENGTH)
+HashBase.prototype._digest = function () {
+  throw new Error('_digest is not implemented')
+}
 
-  // 4 bytes: version bytes
-  buffer.writeUInt32BE(version, 0)
+module.exports = HashBase
 
-  // Depth
-  // 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ....
-  buffer.writeUInt8(this.depth, 4)
+}).call(this,require("buffer").Buffer)
+},{"buffer":4,"inherits":93,"stream":27}],93:[function(require,module,exports){
+arguments[4][8][0].apply(exports,arguments)
+},{"dup":8}],94:[function(require,module,exports){
+(function (Buffer){
+// constant-space merkle root calculation algorithm
+module.exports = function fastRoot (values, digestFn) {
+  if (!Array.isArray(values)) throw TypeError('Expected values Array')
+  if (typeof digestFn !== 'function') throw TypeError('Expected digest Function')
 
-  // 4 bytes: the fingerprint of the parent's key (0x00000000 if master key)
-  buffer.writeUInt32BE(this.parentFingerprint, 5)
+  var length = values.length
+  var results = values.concat()
 
-  // 4 bytes: child number. This is the number i in xi = xpar/i, with xi the key being serialized.
-  // This is encoded in Big endian. (0x00000000 if master key)
-  buffer.writeUInt32BE(this.index, 9)
+  while (length > 1) {
+    var j = 0
 
-  // 32 bytes: the chain code
-  this.chainCode.copy(buffer, 13)
+    for (var i = 0; i < length; i += 2, ++j) {
+      var left = results[i]
+      var right = i + 1 === length ? left : results[i + 1]
+      var data = Buffer.concat([left, right])
 
-  // 33 bytes: the public key or private key data
-  if (isPrivate) {
-    // FIXME: remove in 2.x.y
-    assert(this.privKey, 'Missing private key')
+      results[j] = digestFn(data)
+    }
 
-    // 0x00 + k for private keys
-    buffer.writeUInt8(0, 45)
-    this.privKey.d.toBuffer(32).copy(buffer, 46)
-  } else {
-    // X9.62 encoding for public keys
-    this.pubKey.toBuffer().copy(buffer, 45)
+    length = j
   }
 
-  return buffer
+  return results[0]
 }
 
-// FIXME: remove in 2.x.y
-HDNode.prototype.toHex = function (isPrivate) {
-  return this.toBuffer(isPrivate).toString('hex')
+}).call(this,require("buffer").Buffer)
+},{"buffer":4}],95:[function(require,module,exports){
+var OPS = require('bitcoin-ops')
+
+function encodingLength (i) {
+  return i < OPS.OP_PUSHDATA1 ? 1
+  : i <= 0xff ? 2
+  : i <= 0xffff ? 3
+  : 5
 }
 
-// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#child-key-derivation-ckd-functions
-HDNode.prototype.derive = function (index) {
-  var isHardened = index >= HDNode.HIGHEST_BIT
-  var indexBuffer = new Buffer(4)
-  indexBuffer.writeUInt32BE(index, 0)
+function encode (buffer, number, offset) {
+  var size = encodingLength(number)
 
-  var data
+  // ~6 bit
+  if (size === 1) {
+    buffer.writeUInt8(number, offset)
 
-  // Hardened child
-  if (isHardened) {
-    assert(this.privKey, 'Could not derive hardened child key')
+  // 8 bit
+  } else if (size === 2) {
+    buffer.writeUInt8(OPS.OP_PUSHDATA1, offset)
+    buffer.writeUInt8(number, offset + 1)
 
-    // data = 0x00 || ser256(kpar) || ser32(index)
-    data = Buffer.concat([
-      this.privKey.d.toBuffer(33),
-      indexBuffer
-    ])
+  // 16 bit
+  } else if (size === 3) {
+    buffer.writeUInt8(OPS.OP_PUSHDATA2, offset)
+    buffer.writeUInt16LE(number, offset + 1)
 
-  // Normal child
+  // 32 bit
   } else {
-    // data = serP(point(kpar)) || ser32(index)
-    //      = serP(Kpar) || ser32(index)
-    data = Buffer.concat([
-      this.pubKey.toBuffer(),
-      indexBuffer
-    ])
+    buffer.writeUInt8(OPS.OP_PUSHDATA4, offset)
+    buffer.writeUInt32LE(number, offset + 1)
   }
 
-  var I = createHmac('sha512', this.chainCode).update(data).digest()
-  var IL = I.slice(0, 32)
-  var IR = I.slice(32)
-
-  var pIL = BigInteger.fromBuffer(IL)
+  return size
+}
 
-  // In case parse256(IL) >= n, proceed with the next value for i
-  if (pIL.compareTo(curve.n) >= 0) {
-    return this.derive(index + 1)
-  }
+function decode (buffer, offset) {
+  var opcode = buffer.readUInt8(offset)
+  var number, size
 
-  // Private parent key -> private child key
-  var hd
-  if (this.privKey) {
-    // ki = parse256(IL) + kpar (mod n)
-    var ki = pIL.add(this.privKey.d).mod(curve.n)
+  // ~6 bit
+  if (opcode < OPS.OP_PUSHDATA1) {
+    number = opcode
+    size = 1
 
-    // In case ki == 0, proceed with the next value for i
-    if (ki.signum() === 0) {
-      return this.derive(index + 1)
-    }
+  // 8 bit
+  } else if (opcode === OPS.OP_PUSHDATA1) {
+    if (offset + 2 > buffer.length) return null
+    number = buffer.readUInt8(offset + 1)
+    size = 2
 
-    hd = new HDNode(ki, IR, this.network)
+  // 16 bit
+  } else if (opcode === OPS.OP_PUSHDATA2) {
+    if (offset + 3 > buffer.length) return null
+    number = buffer.readUInt16LE(offset + 1)
+    size = 3
 
-  // Public parent key -> public child key
+  // 32 bit
   } else {
-    // Ki = point(parse256(IL)) + Kpar
-    //    = G*IL + Kpar
-    var Ki = curve.G.multiply(pIL).add(this.pubKey.Q)
-
-    // In case Ki is the point at infinity, proceed with the next value for i
-    if (curve.isInfinity(Ki)) {
-      return this.derive(index + 1)
-    }
+    if (offset + 5 > buffer.length) return null
+    if (opcode !== OPS.OP_PUSHDATA4) throw new Error('Unexpected opcode')
 
-    hd = new HDNode(Ki, IR, this.network)
+    number = buffer.readUInt32LE(offset + 1)
+    size = 5
   }
 
-  hd.depth = this.depth + 1
-  hd.index = index
-  hd.parentFingerprint = this.getFingerprint().readUInt32BE(0)
-
-  return hd
+  return {
+    opcode: opcode,
+    number: number,
+    size: size
+  }
 }
 
-HDNode.prototype.deriveHardened = function (index) {
-  // Only derives hardened private keys by default
-  return this.derive(index + HDNode.HIGHEST_BIT)
+module.exports = {
+  encodingLength: encodingLength,
+  encode: encode,
+  decode: decode
 }
 
-HDNode.prototype.toString = HDNode.prototype.toBase58
+},{"bitcoin-ops":40}],96:[function(require,module,exports){
+(function (process,global){
+'use strict'
 
-module.exports = HDNode
+function oldBrowser () {
+  throw new Error('secure random number generation not supported by this browser\nuse chrome, FireFox or Internet Explorer 11')
+}
 
-}).call(this,require("buffer").Buffer)
-},{"./crypto":58,"./eckey":60,"./ecpubkey":61,"./networks":66,"assert":5,"bigi":3,"bs58check":31,"buffer":7,"create-hmac":45,"ecurve":49,"typeforce":53}],64:[function(require,module,exports){
-module.exports = {
-  Address: require('./address'),
-  base58check: require('./base58check'),
-  Block: require('./block'),
-  bufferutils: require('./bufferutils'),
-  crypto: require('./crypto'),
-  ecdsa: require('./ecdsa'),
-  ECKey: require('./eckey'),
-  ECPubKey: require('./ecpubkey'),
-  ECSignature: require('./ecsignature'),
-  Message: require('./message'),
-  opcodes: require('./opcodes'),
-  HDNode: require('./hdnode'),
-  Script: require('./script'),
-  scripts: require('./scripts'),
-  Transaction: require('./transaction'),
-  TransactionBuilder: require('./transaction_builder'),
-  networks: require('./networks'),
-  Wallet: require('./wallet')
+var Buffer = require('safe-buffer').Buffer
+var crypto = global.crypto || global.msCrypto
+
+if (crypto && crypto.getRandomValues) {
+  module.exports = randomBytes
+} else {
+  module.exports = oldBrowser
 }
 
-},{"./address":54,"./base58check":55,"./block":56,"./bufferutils":57,"./crypto":58,"./ecdsa":59,"./eckey":60,"./ecpubkey":61,"./ecsignature":62,"./hdnode":63,"./message":65,"./networks":66,"./opcodes":67,"./script":68,"./scripts":69,"./transaction":70,"./transaction_builder":71,"./wallet":72}],65:[function(require,module,exports){
-(function (Buffer){
-var bufferutils = require('./bufferutils')
-var crypto = require('./crypto')
-var ecdsa = require('./ecdsa')
-var networks = require('./networks')
+function randomBytes (size, cb) {
+  // phantomjs needs to throw
+  if (size > 65536) throw new Error('requested too many random bytes')
+  // in case browserify  isn't using the Uint8Array version
+  var rawBytes = new global.Uint8Array(size)
 
-var BigInteger = require('bigi')
-var ECPubKey = require('./ecpubkey')
-var ECSignature = require('./ecsignature')
+  // This will not work in older browsers.
+  // See https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues
+  if (size > 0) {  // getRandomValues fails on IE if size == 0
+    crypto.getRandomValues(rawBytes)
+  }
 
-var ecurve = require('ecurve')
-var ecparams = ecurve.getCurveByName('secp256k1')
+  // XXX: phantomjs doesn't like a buffer being passed here
+  var bytes = Buffer.from(rawBytes.buffer)
 
-function magicHash (message, network) {
-  var magicPrefix = new Buffer(network.magicPrefix)
-  var messageBuffer = new Buffer(message)
-  var lengthBuffer = bufferutils.varIntBuffer(messageBuffer.length)
+  if (typeof cb === 'function') {
+    return process.nextTick(function () {
+      cb(null, bytes)
+    })
+  }
 
-  var buffer = Buffer.concat([magicPrefix, lengthBuffer, messageBuffer])
-  return crypto.hash256(buffer)
+  return bytes
 }
 
-function sign (privKey, message, network) {
-  network = network || networks.bitcoin
+}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"_process":12,"safe-buffer":98}],97:[function(require,module,exports){
+(function (Buffer){
+'use strict'
+var inherits = require('inherits')
+var HashBase = require('hash-base')
 
-  var hash = magicHash(message, network)
-  var signature = privKey.sign(hash)
-  var e = BigInteger.fromBuffer(hash)
-  var i = ecdsa.calcPubKeyRecoveryParam(ecparams, e, signature, privKey.pub.Q)
+function RIPEMD160 () {
+  HashBase.call(this, 64)
 
-  return signature.toCompact(i, privKey.pub.compressed)
+  // state
+  this._a = 0x67452301
+  this._b = 0xefcdab89
+  this._c = 0x98badcfe
+  this._d = 0x10325476
+  this._e = 0xc3d2e1f0
 }
 
-// TODO: network could be implied from address
-function verify (address, signature, message, network) {
-  if (!Buffer.isBuffer(signature)) {
-    signature = new Buffer(signature, 'base64')
-  }
-
-  network = network || networks.bitcoin
-
-  var hash = magicHash(message, network)
-  var parsed = ECSignature.parseCompact(signature)
-  var e = BigInteger.fromBuffer(hash)
-  var Q = ecdsa.recoverPubKey(ecparams, e, parsed.signature, parsed.i)
+inherits(RIPEMD160, HashBase)
+
+RIPEMD160.prototype._update = function () {
+  var m = new Array(16)
+  for (var i = 0; i < 16; ++i) m[i] = this._block.readInt32LE(i * 4)
+
+  var al = this._a
+  var bl = this._b
+  var cl = this._c
+  var dl = this._d
+  var el = this._e
+
+  // Mj = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
+  // K = 0x00000000
+  // Sj = 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8
+  al = fn1(al, bl, cl, dl, el, m[0], 0x00000000, 11); cl = rotl(cl, 10)
+  el = fn1(el, al, bl, cl, dl, m[1], 0x00000000, 14); bl = rotl(bl, 10)
+  dl = fn1(dl, el, al, bl, cl, m[2], 0x00000000, 15); al = rotl(al, 10)
+  cl = fn1(cl, dl, el, al, bl, m[3], 0x00000000, 12); el = rotl(el, 10)
+  bl = fn1(bl, cl, dl, el, al, m[4], 0x00000000, 5); dl = rotl(dl, 10)
+  al = fn1(al, bl, cl, dl, el, m[5], 0x00000000, 8); cl = rotl(cl, 10)
+  el = fn1(el, al, bl, cl, dl, m[6], 0x00000000, 7); bl = rotl(bl, 10)
+  dl = fn1(dl, el, al, bl, cl, m[7], 0x00000000, 9); al = rotl(al, 10)
+  cl = fn1(cl, dl, el, al, bl, m[8], 0x00000000, 11); el = rotl(el, 10)
+  bl = fn1(bl, cl, dl, el, al, m[9], 0x00000000, 13); dl = rotl(dl, 10)
+  al = fn1(al, bl, cl, dl, el, m[10], 0x00000000, 14); cl = rotl(cl, 10)
+  el = fn1(el, al, bl, cl, dl, m[11], 0x00000000, 15); bl = rotl(bl, 10)
+  dl = fn1(dl, el, al, bl, cl, m[12], 0x00000000, 6); al = rotl(al, 10)
+  cl = fn1(cl, dl, el, al, bl, m[13], 0x00000000, 7); el = rotl(el, 10)
+  bl = fn1(bl, cl, dl, el, al, m[14], 0x00000000, 9); dl = rotl(dl, 10)
+  al = fn1(al, bl, cl, dl, el, m[15], 0x00000000, 8); cl = rotl(cl, 10)
+
+  // Mj = 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8
+  // K = 0x5a827999
+  // Sj = 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12
+  el = fn2(el, al, bl, cl, dl, m[7], 0x5a827999, 7); bl = rotl(bl, 10)
+  dl = fn2(dl, el, al, bl, cl, m[4], 0x5a827999, 6); al = rotl(al, 10)
+  cl = fn2(cl, dl, el, al, bl, m[13], 0x5a827999, 8); el = rotl(el, 10)
+  bl = fn2(bl, cl, dl, el, al, m[1], 0x5a827999, 13); dl = rotl(dl, 10)
+  al = fn2(al, bl, cl, dl, el, m[10], 0x5a827999, 11); cl = rotl(cl, 10)
+  el = fn2(el, al, bl, cl, dl, m[6], 0x5a827999, 9); bl = rotl(bl, 10)
+  dl = fn2(dl, el, al, bl, cl, m[15], 0x5a827999, 7); al = rotl(al, 10)
+  cl = fn2(cl, dl, el, al, bl, m[3], 0x5a827999, 15); el = rotl(el, 10)
+  bl = fn2(bl, cl, dl, el, al, m[12], 0x5a827999, 7); dl = rotl(dl, 10)
+  al = fn2(al, bl, cl, dl, el, m[0], 0x5a827999, 12); cl = rotl(cl, 10)
+  el = fn2(el, al, bl, cl, dl, m[9], 0x5a827999, 15); bl = rotl(bl, 10)
+  dl = fn2(dl, el, al, bl, cl, m[5], 0x5a827999, 9); al = rotl(al, 10)
+  cl = fn2(cl, dl, el, al, bl, m[2], 0x5a827999, 11); el = rotl(el, 10)
+  bl = fn2(bl, cl, dl, el, al, m[14], 0x5a827999, 7); dl = rotl(dl, 10)
+  al = fn2(al, bl, cl, dl, el, m[11], 0x5a827999, 13); cl = rotl(cl, 10)
+  el = fn2(el, al, bl, cl, dl, m[8], 0x5a827999, 12); bl = rotl(bl, 10)
+
+  // Mj = 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12
+  // K = 0x6ed9eba1
+  // Sj = 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5
+  dl = fn3(dl, el, al, bl, cl, m[3], 0x6ed9eba1, 11); al = rotl(al, 10)
+  cl = fn3(cl, dl, el, al, bl, m[10], 0x6ed9eba1, 13); el = rotl(el, 10)
+  bl = fn3(bl, cl, dl, el, al, m[14], 0x6ed9eba1, 6); dl = rotl(dl, 10)
+  al = fn3(al, bl, cl, dl, el, m[4], 0x6ed9eba1, 7); cl = rotl(cl, 10)
+  el = fn3(el, al, bl, cl, dl, m[9], 0x6ed9eba1, 14); bl = rotl(bl, 10)
+  dl = fn3(dl, el, al, bl, cl, m[15], 0x6ed9eba1, 9); al = rotl(al, 10)
+  cl = fn3(cl, dl, el, al, bl, m[8], 0x6ed9eba1, 13); el = rotl(el, 10)
+  bl = fn3(bl, cl, dl, el, al, m[1], 0x6ed9eba1, 15); dl = rotl(dl, 10)
+  al = fn3(al, bl, cl, dl, el, m[2], 0x6ed9eba1, 14); cl = rotl(cl, 10)
+  el = fn3(el, al, bl, cl, dl, m[7], 0x6ed9eba1, 8); bl = rotl(bl, 10)
+  dl = fn3(dl, el, al, bl, cl, m[0], 0x6ed9eba1, 13); al = rotl(al, 10)
+  cl = fn3(cl, dl, el, al, bl, m[6], 0x6ed9eba1, 6); el = rotl(el, 10)
+  bl = fn3(bl, cl, dl, el, al, m[13], 0x6ed9eba1, 5); dl = rotl(dl, 10)
+  al = fn3(al, bl, cl, dl, el, m[11], 0x6ed9eba1, 12); cl = rotl(cl, 10)
+  el = fn3(el, al, bl, cl, dl, m[5], 0x6ed9eba1, 7); bl = rotl(bl, 10)
+  dl = fn3(dl, el, al, bl, cl, m[12], 0x6ed9eba1, 5); al = rotl(al, 10)
+
+  // Mj = 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2
+  // K = 0x8f1bbcdc
+  // Sj = 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12
+  cl = fn4(cl, dl, el, al, bl, m[1], 0x8f1bbcdc, 11); el = rotl(el, 10)
+  bl = fn4(bl, cl, dl, el, al, m[9], 0x8f1bbcdc, 12); dl = rotl(dl, 10)
+  al = fn4(al, bl, cl, dl, el, m[11], 0x8f1bbcdc, 14); cl = rotl(cl, 10)
+  el = fn4(el, al, bl, cl, dl, m[10], 0x8f1bbcdc, 15); bl = rotl(bl, 10)
+  dl = fn4(dl, el, al, bl, cl, m[0], 0x8f1bbcdc, 14); al = rotl(al, 10)
+  cl = fn4(cl, dl, el, al, bl, m[8], 0x8f1bbcdc, 15); el = rotl(el, 10)
+  bl = fn4(bl, cl, dl, el, al, m[12], 0x8f1bbcdc, 9); dl = rotl(dl, 10)
+  al = fn4(al, bl, cl, dl, el, m[4], 0x8f1bbcdc, 8); cl = rotl(cl, 10)
+  el = fn4(el, al, bl, cl, dl, m[13], 0x8f1bbcdc, 9); bl = rotl(bl, 10)
+  dl = fn4(dl, el, al, bl, cl, m[3], 0x8f1bbcdc, 14); al = rotl(al, 10)
+  cl = fn4(cl, dl, el, al, bl, m[7], 0x8f1bbcdc, 5); el = rotl(el, 10)
+  bl = fn4(bl, cl, dl, el, al, m[15], 0x8f1bbcdc, 6); dl = rotl(dl, 10)
+  al = fn4(al, bl, cl, dl, el, m[14], 0x8f1bbcdc, 8); cl = rotl(cl, 10)
+  el = fn4(el, al, bl, cl, dl, m[5], 0x8f1bbcdc, 6); bl = rotl(bl, 10)
+  dl = fn4(dl, el, al, bl, cl, m[6], 0x8f1bbcdc, 5); al = rotl(al, 10)
+  cl = fn4(cl, dl, el, al, bl, m[2], 0x8f1bbcdc, 12); el = rotl(el, 10)
+
+  // Mj = 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
+  // K = 0xa953fd4e
+  // Sj = 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
+  bl = fn5(bl, cl, dl, el, al, m[4], 0xa953fd4e, 9); dl = rotl(dl, 10)
+  al = fn5(al, bl, cl, dl, el, m[0], 0xa953fd4e, 15); cl = rotl(cl, 10)
+  el = fn5(el, al, bl, cl, dl, m[5], 0xa953fd4e, 5); bl = rotl(bl, 10)
+  dl = fn5(dl, el, al, bl, cl, m[9], 0xa953fd4e, 11); al = rotl(al, 10)
+  cl = fn5(cl, dl, el, al, bl, m[7], 0xa953fd4e, 6); el = rotl(el, 10)
+  bl = fn5(bl, cl, dl, el, al, m[12], 0xa953fd4e, 8); dl = rotl(dl, 10)
+  al = fn5(al, bl, cl, dl, el, m[2], 0xa953fd4e, 13); cl = rotl(cl, 10)
+  el = fn5(el, al, bl, cl, dl, m[10], 0xa953fd4e, 12); bl = rotl(bl, 10)
+  dl = fn5(dl, el, al, bl, cl, m[14], 0xa953fd4e, 5); al = rotl(al, 10)
+  cl = fn5(cl, dl, el, al, bl, m[1], 0xa953fd4e, 12); el = rotl(el, 10)
+  bl = fn5(bl, cl, dl, el, al, m[3], 0xa953fd4e, 13); dl = rotl(dl, 10)
+  al = fn5(al, bl, cl, dl, el, m[8], 0xa953fd4e, 14); cl = rotl(cl, 10)
+  el = fn5(el, al, bl, cl, dl, m[11], 0xa953fd4e, 11); bl = rotl(bl, 10)
+  dl = fn5(dl, el, al, bl, cl, m[6], 0xa953fd4e, 8); al = rotl(al, 10)
+  cl = fn5(cl, dl, el, al, bl, m[15], 0xa953fd4e, 5); el = rotl(el, 10)
+  bl = fn5(bl, cl, dl, el, al, m[13], 0xa953fd4e, 6); dl = rotl(dl, 10)
+
+  var ar = this._a
+  var br = this._b
+  var cr = this._c
+  var dr = this._d
+  var er = this._e
+
+  // M'j = 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12
+  // K' = 0x50a28be6
+  // S'j = 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6
+  ar = fn5(ar, br, cr, dr, er, m[5], 0x50a28be6, 8); cr = rotl(cr, 10)
+  er = fn5(er, ar, br, cr, dr, m[14], 0x50a28be6, 9); br = rotl(br, 10)
+  dr = fn5(dr, er, ar, br, cr, m[7], 0x50a28be6, 9); ar = rotl(ar, 10)
+  cr = fn5(cr, dr, er, ar, br, m[0], 0x50a28be6, 11); er = rotl(er, 10)
+  br = fn5(br, cr, dr, er, ar, m[9], 0x50a28be6, 13); dr = rotl(dr, 10)
+  ar = fn5(ar, br, cr, dr, er, m[2], 0x50a28be6, 15); cr = rotl(cr, 10)
+  er = fn5(er, ar, br, cr, dr, m[11], 0x50a28be6, 15); br = rotl(br, 10)
+  dr = fn5(dr, er, ar, br, cr, m[4], 0x50a28be6, 5); ar = rotl(ar, 10)
+  cr = fn5(cr, dr, er, ar, br, m[13], 0x50a28be6, 7); er = rotl(er, 10)
+  br = fn5(br, cr, dr, er, ar, m[6], 0x50a28be6, 7); dr = rotl(dr, 10)
+  ar = fn5(ar, br, cr, dr, er, m[15], 0x50a28be6, 8); cr = rotl(cr, 10)
+  er = fn5(er, ar, br, cr, dr, m[8], 0x50a28be6, 11); br = rotl(br, 10)
+  dr = fn5(dr, er, ar, br, cr, m[1], 0x50a28be6, 14); ar = rotl(ar, 10)
+  cr = fn5(cr, dr, er, ar, br, m[10], 0x50a28be6, 14); er = rotl(er, 10)
+  br = fn5(br, cr, dr, er, ar, m[3], 0x50a28be6, 12); dr = rotl(dr, 10)
+  ar = fn5(ar, br, cr, dr, er, m[12], 0x50a28be6, 6); cr = rotl(cr, 10)
+
+  // M'j = 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2
+  // K' = 0x5c4dd124
+  // S'j = 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11
+  er = fn4(er, ar, br, cr, dr, m[6], 0x5c4dd124, 9); br = rotl(br, 10)
+  dr = fn4(dr, er, ar, br, cr, m[11], 0x5c4dd124, 13); ar = rotl(ar, 10)
+  cr = fn4(cr, dr, er, ar, br, m[3], 0x5c4dd124, 15); er = rotl(er, 10)
+  br = fn4(br, cr, dr, er, ar, m[7], 0x5c4dd124, 7); dr = rotl(dr, 10)
+  ar = fn4(ar, br, cr, dr, er, m[0], 0x5c4dd124, 12); cr = rotl(cr, 10)
+  er = fn4(er, ar, br, cr, dr, m[13], 0x5c4dd124, 8); br = rotl(br, 10)
+  dr = fn4(dr, er, ar, br, cr, m[5], 0x5c4dd124, 9); ar = rotl(ar, 10)
+  cr = fn4(cr, dr, er, ar, br, m[10], 0x5c4dd124, 11); er = rotl(er, 10)
+  br = fn4(br, cr, dr, er, ar, m[14], 0x5c4dd124, 7); dr = rotl(dr, 10)
+  ar = fn4(ar, br, cr, dr, er, m[15], 0x5c4dd124, 7); cr = rotl(cr, 10)
+  er = fn4(er, ar, br, cr, dr, m[8], 0x5c4dd124, 12); br = rotl(br, 10)
+  dr = fn4(dr, er, ar, br, cr, m[12], 0x5c4dd124, 7); ar = rotl(ar, 10)
+  cr = fn4(cr, dr, er, ar, br, m[4], 0x5c4dd124, 6); er = rotl(er, 10)
+  br = fn4(br, cr, dr, er, ar, m[9], 0x5c4dd124, 15); dr = rotl(dr, 10)
+  ar = fn4(ar, br, cr, dr, er, m[1], 0x5c4dd124, 13); cr = rotl(cr, 10)
+  er = fn4(er, ar, br, cr, dr, m[2], 0x5c4dd124, 11); br = rotl(br, 10)
+
+  // M'j = 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13
+  // K' = 0x6d703ef3
+  // S'j = 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5
+  dr = fn3(dr, er, ar, br, cr, m[15], 0x6d703ef3, 9); ar = rotl(ar, 10)
+  cr = fn3(cr, dr, er, ar, br, m[5], 0x6d703ef3, 7); er = rotl(er, 10)
+  br = fn3(br, cr, dr, er, ar, m[1], 0x6d703ef3, 15); dr = rotl(dr, 10)
+  ar = fn3(ar, br, cr, dr, er, m[3], 0x6d703ef3, 11); cr = rotl(cr, 10)
+  er = fn3(er, ar, br, cr, dr, m[7], 0x6d703ef3, 8); br = rotl(br, 10)
+  dr = fn3(dr, er, ar, br, cr, m[14], 0x6d703ef3, 6); ar = rotl(ar, 10)
+  cr = fn3(cr, dr, er, ar, br, m[6], 0x6d703ef3, 6); er = rotl(er, 10)
+  br = fn3(br, cr, dr, er, ar, m[9], 0x6d703ef3, 14); dr = rotl(dr, 10)
+  ar = fn3(ar, br, cr, dr, er, m[11], 0x6d703ef3, 12); cr = rotl(cr, 10)
+  er = fn3(er, ar, br, cr, dr, m[8], 0x6d703ef3, 13); br = rotl(br, 10)
+  dr = fn3(dr, er, ar, br, cr, m[12], 0x6d703ef3, 5); ar = rotl(ar, 10)
+  cr = fn3(cr, dr, er, ar, br, m[2], 0x6d703ef3, 14); er = rotl(er, 10)
+  br = fn3(br, cr, dr, er, ar, m[10], 0x6d703ef3, 13); dr = rotl(dr, 10)
+  ar = fn3(ar, br, cr, dr, er, m[0], 0x6d703ef3, 13); cr = rotl(cr, 10)
+  er = fn3(er, ar, br, cr, dr, m[4], 0x6d703ef3, 7); br = rotl(br, 10)
+  dr = fn3(dr, er, ar, br, cr, m[13], 0x6d703ef3, 5); ar = rotl(ar, 10)
+
+  // M'j = 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14
+  // K' = 0x7a6d76e9
+  // S'j = 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8
+  cr = fn2(cr, dr, er, ar, br, m[8], 0x7a6d76e9, 15); er = rotl(er, 10)
+  br = fn2(br, cr, dr, er, ar, m[6], 0x7a6d76e9, 5); dr = rotl(dr, 10)
+  ar = fn2(ar, br, cr, dr, er, m[4], 0x7a6d76e9, 8); cr = rotl(cr, 10)
+  er = fn2(er, ar, br, cr, dr, m[1], 0x7a6d76e9, 11); br = rotl(br, 10)
+  dr = fn2(dr, er, ar, br, cr, m[3], 0x7a6d76e9, 14); ar = rotl(ar, 10)
+  cr = fn2(cr, dr, er, ar, br, m[11], 0x7a6d76e9, 14); er = rotl(er, 10)
+  br = fn2(br, cr, dr, er, ar, m[15], 0x7a6d76e9, 6); dr = rotl(dr, 10)
+  ar = fn2(ar, br, cr, dr, er, m[0], 0x7a6d76e9, 14); cr = rotl(cr, 10)
+  er = fn2(er, ar, br, cr, dr, m[5], 0x7a6d76e9, 6); br = rotl(br, 10)
+  dr = fn2(dr, er, ar, br, cr, m[12], 0x7a6d76e9, 9); ar = rotl(ar, 10)
+  cr = fn2(cr, dr, er, ar, br, m[2], 0x7a6d76e9, 12); er = rotl(er, 10)
+  br = fn2(br, cr, dr, er, ar, m[13], 0x7a6d76e9, 9); dr = rotl(dr, 10)
+  ar = fn2(ar, br, cr, dr, er, m[9], 0x7a6d76e9, 12); cr = rotl(cr, 10)
+  er = fn2(er, ar, br, cr, dr, m[7], 0x7a6d76e9, 5); br = rotl(br, 10)
+  dr = fn2(dr, er, ar, br, cr, m[10], 0x7a6d76e9, 15); ar = rotl(ar, 10)
+  cr = fn2(cr, dr, er, ar, br, m[14], 0x7a6d76e9, 8); er = rotl(er, 10)
+
+  // M'j = 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
+  // K' = 0x00000000
+  // S'j = 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
+  br = fn1(br, cr, dr, er, ar, m[12], 0x00000000, 8); dr = rotl(dr, 10)
+  ar = fn1(ar, br, cr, dr, er, m[15], 0x00000000, 5); cr = rotl(cr, 10)
+  er = fn1(er, ar, br, cr, dr, m[10], 0x00000000, 12); br = rotl(br, 10)
+  dr = fn1(dr, er, ar, br, cr, m[4], 0x00000000, 9); ar = rotl(ar, 10)
+  cr = fn1(cr, dr, er, ar, br, m[1], 0x00000000, 12); er = rotl(er, 10)
+  br = fn1(br, cr, dr, er, ar, m[5], 0x00000000, 5); dr = rotl(dr, 10)
+  ar = fn1(ar, br, cr, dr, er, m[8], 0x00000000, 14); cr = rotl(cr, 10)
+  er = fn1(er, ar, br, cr, dr, m[7], 0x00000000, 6); br = rotl(br, 10)
+  dr = fn1(dr, er, ar, br, cr, m[6], 0x00000000, 8); ar = rotl(ar, 10)
+  cr = fn1(cr, dr, er, ar, br, m[2], 0x00000000, 13); er = rotl(er, 10)
+  br = fn1(br, cr, dr, er, ar, m[13], 0x00000000, 6); dr = rotl(dr, 10)
+  ar = fn1(ar, br, cr, dr, er, m[14], 0x00000000, 5); cr = rotl(cr, 10)
+  er = fn1(er, ar, br, cr, dr, m[0], 0x00000000, 15); br = rotl(br, 10)
+  dr = fn1(dr, er, ar, br, cr, m[3], 0x00000000, 13); ar = rotl(ar, 10)
+  cr = fn1(cr, dr, er, ar, br, m[9], 0x00000000, 11); er = rotl(er, 10)
+  br = fn1(br, cr, dr, er, ar, m[11], 0x00000000, 11); dr = rotl(dr, 10)
+
+  // change state
+  var t = (this._b + cl + dr) | 0
+  this._b = (this._c + dl + er) | 0
+  this._c = (this._d + el + ar) | 0
+  this._d = (this._e + al + br) | 0
+  this._e = (this._a + bl + cr) | 0
+  this._a = t
+}
+
+RIPEMD160.prototype._digest = function () {
+  // create padding and handle blocks
+  this._block[this._blockOffset++] = 0x80
+  if (this._blockOffset > 56) {
+    this._block.fill(0, this._blockOffset, 64)
+    this._update()
+    this._blockOffset = 0
+  }
+
+  this._block.fill(0, this._blockOffset, 56)
+  this._block.writeUInt32LE(this._length[0], 56)
+  this._block.writeUInt32LE(this._length[1], 60)
+  this._update()
+
+  // produce result
+  var buffer = new Buffer(20)
+  buffer.writeInt32LE(this._a, 0)
+  buffer.writeInt32LE(this._b, 4)
+  buffer.writeInt32LE(this._c, 8)
+  buffer.writeInt32LE(this._d, 12)
+  buffer.writeInt32LE(this._e, 16)
+  return buffer
+}
 
-  var pubKey = new ECPubKey(Q, parsed.compressed)
-  return pubKey.getAddress(network).toString() === address.toString()
+function rotl (x, n) {
+  return (x << n) | (x >>> (32 - n))
 }
 
-module.exports = {
-  magicHash: magicHash,
-  sign: sign,
-  verify: verify
+function fn1 (a, b, c, d, e, m, k, s) {
+  return (rotl((a + (b ^ c ^ d) + m + k) | 0, s) + e) | 0
 }
 
-}).call(this,require("buffer").Buffer)
-},{"./bufferutils":57,"./crypto":58,"./ecdsa":59,"./ecpubkey":61,"./ecsignature":62,"./networks":66,"bigi":3,"buffer":7,"ecurve":49}],66:[function(require,module,exports){
-// https://en.bitcoin.it/wiki/List_of_address_prefixes
-// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
+function fn2 (a, b, c, d, e, m, k, s) {
+  return (rotl((a + ((b & c) | ((~b) & d)) + m + k) | 0, s) + e) | 0
+}
 
-var networks = {
-  bitcoin: {
-    magicPrefix: '\x18Bitcoin Signed Message:\n',
-    bip32: {
-      public: 0x0488b21e,
-      private: 0x0488ade4
-    },
-    pubKeyHash: 0x00,
-    scriptHash: 0x05,
-    wif: 0x80,
-    dustThreshold: 546, // https://github.com/bitcoin/bitcoin/blob/v0.9.2/src/core.h#L151-L162
-    feePerKb: 10000, // https://github.com/bitcoin/bitcoin/blob/v0.9.2/src/main.cpp#L53
-    estimateFee: estimateFee('bitcoin')
-  },
-  testnet: {
-    magicPrefix: '\x18Bitcoin Signed Message:\n',
-    bip32: {
-      public: 0x043587cf,
-      private: 0x04358394
-    },
-    pubKeyHash: 0x6f,
-    scriptHash: 0xc4,
-    wif: 0xef,
-    dustThreshold: 546,
-    feePerKb: 10000,
-    estimateFee: estimateFee('testnet')
-  },
-  litecoin: {
-    magicPrefix: '\x19Litecoin Signed Message:\n',
-    bip32: {
-      public: 0x019da462,
-      private: 0x019d9cfe
-    },
-    pubKeyHash: 0x30,
-    scriptHash: 0x05,
-    wif: 0xb0,
-    dustThreshold: 0, // https://github.com/litecoin-project/litecoin/blob/v0.8.7.2/src/main.cpp#L360-L365
-    dustSoftThreshold: 100000, // https://github.com/litecoin-project/litecoin/blob/v0.8.7.2/src/main.h#L53
-    feePerKb: 100000, // https://github.com/litecoin-project/litecoin/blob/v0.8.7.2/src/main.cpp#L56
-    estimateFee: estimateFee('litecoin')
-  },
-  dogecoin: {
-    magicPrefix: '\x19Dogecoin Signed Message:\n',
-    bip32: {
-      public: 0x02facafd,
-      private: 0x02fac398
-    },
-    pubKeyHash: 0x1e,
-    scriptHash: 0x16,
-    wif: 0x9e,
-    dustThreshold: 0, // https://github.com/dogecoin/dogecoin/blob/v1.7.1/src/core.h#L155-L160
-    dustSoftThreshold: 100000000, // https://github.com/dogecoin/dogecoin/blob/v1.7.1/src/main.h#L62
-    feePerKb: 100000000, // https://github.com/dogecoin/dogecoin/blob/v1.7.1/src/main.cpp#L58
-    estimateFee: estimateFee('dogecoin')
-  },
-  viacoin: {
-    magicPrefix: '\x18Viacoin Signed Message:\n',
-    bip32: {
-      public: 0x0488b21e,
-      private: 0x0488ade4
-    },
-    pubKeyHash: 0x47,
-    scriptHash: 0x21,
-    wif: 0xc7,
-    dustThreshold: 560,
-    dustSoftThreshold: 100000,
-    feePerKb: 100000, //
-    estimateFee: estimateFee('viacoin')
-  },
-  viacointestnet: {
-    magicPrefix: '\x18Viacoin Signed Message:\n',
-    bip32: {
-      public: 0x043587cf,
-      private: 0x04358394
-    },
-    pubKeyHash: 0x7f,
-    scriptHash: 0xc4,
-    wif: 0xff,
-    dustThreshold: 560,
-    dustSoftThreshold: 100000,
-    feePerKb: 100000,
-    estimateFee: estimateFee('viacointestnet')
-  },
-  gamerscoin: {
-    magicPrefix: '\x19Gamerscoin Signed Message:\n',
-    bip32: {
-      public: 0x019da462,
-      private: 0x019d9cfe
-    },
-    pubKeyHash: 0x26,
-    scriptHash: 0x05,
-    wif: 0xA6,
-    dustThreshold: 0, // https://github.com/gamers-coin/gamers-coinv3/blob/master/src/main.cpp#L358-L363
-    dustSoftThreshold: 100000, // https://github.com/gamers-coin/gamers-coinv3/blob/master/src/main.cpp#L51
-    feePerKb: 100000, // https://github.com/gamers-coin/gamers-coinv3/blob/master/src/main.cpp#L54
-    estimateFee: estimateFee('gamerscoin')
-  },
-  jumbucks: {
-    magicPrefix: '\x19Jumbucks Signed Message:\n',
-    bip32: {
-      public: 0x037a689a,
-      private: 0x037a6460
-    },
-    pubKeyHash: 0x2b,
-    scriptHash: 0x05,
-    wif: 0xab,
-    dustThreshold: 0,
-    dustSoftThreshold: 10000,
-    feePerKb: 10000,
-    estimateFee: estimateFee('jumbucks')
-  },
-  zetacoin: {
-    magicPrefix: '\x18Zetacoin Signed Message:\n',
-    bip32: {
-      public: 0x0488b21e,
-      private: 0x0488ade4
-    },
-    pubKeyHash: 0x50,
-    scriptHash: 0x09,
-    wif: 0xe0,
-    dustThreshold: 546, // https://github.com/zetacoin/zetacoin/blob/master/src/core.h#L159
-    feePerKb: 10000, // https://github.com/zetacoin/zetacoin/blob/master/src/main.cpp#L54
-    estimateFee: estimateFee('zetacoin')
-  }
+function fn3 (a, b, c, d, e, m, k, s) {
+  return (rotl((a + ((b | (~c)) ^ d) + m + k) | 0, s) + e) | 0
 }
 
-function estimateFee (type) {
-  return function (tx) {
-    var network = networks[type]
-    var baseFee = network.feePerKb
-    var byteSize = tx.toBuffer().length
+function fn4 (a, b, c, d, e, m, k, s) {
+  return (rotl((a + ((b & d) | (c & (~d))) + m + k) | 0, s) + e) | 0
+}
 
-    var fee = baseFee * Math.ceil(byteSize / 1000)
-    if (network.dustSoftThreshold === undefined) return fee
+function fn5 (a, b, c, d, e, m, k, s) {
+  return (rotl((a + (b ^ (c | (~d))) + m + k) | 0, s) + e) | 0
+}
 
-    tx.outs.forEach(function (e) {
-      if (e.value < network.dustSoftThreshold) {
-        fee += baseFee
-      }
-    })
+module.exports = RIPEMD160
 
-    return fee
-  }
+}).call(this,require("buffer").Buffer)
+},{"buffer":4,"hash-base":92,"inherits":93}],98:[function(require,module,exports){
+arguments[4][26][0].apply(exports,arguments)
+},{"buffer":4,"dup":26}],99:[function(require,module,exports){
+(function (Buffer){
+// prototype class for hash functions
+function Hash (blockSize, finalSize) {
+  this._block = new Buffer(blockSize)
+  this._finalSize = finalSize
+  this._blockSize = blockSize
+  this._len = 0
+  this._s = 0
 }
 
-module.exports = networks
+Hash.prototype.update = function (data, enc) {
+  if (typeof data === 'string') {
+    enc = enc || 'utf8'
+    data = new Buffer(data, enc)
+  }
 
-},{}],67:[function(require,module,exports){
-module.exports = {
-  // push value
-  OP_FALSE: 0,
-  OP_0: 0,
-  OP_PUSHDATA1: 76,
-  OP_PUSHDATA2: 77,
-  OP_PUSHDATA4: 78,
-  OP_1NEGATE: 79,
-  OP_RESERVED: 80,
-  OP_1: 81,
-  OP_TRUE: 81,
-  OP_2: 82,
-  OP_3: 83,
-  OP_4: 84,
-  OP_5: 85,
-  OP_6: 86,
-  OP_7: 87,
-  OP_8: 88,
-  OP_9: 89,
-  OP_10: 90,
-  OP_11: 91,
-  OP_12: 92,
-  OP_13: 93,
-  OP_14: 94,
-  OP_15: 95,
-  OP_16: 96,
-
-  // control
-  OP_NOP: 97,
-  OP_VER: 98,
-  OP_IF: 99,
-  OP_NOTIF: 100,
-  OP_VERIF: 101,
-  OP_VERNOTIF: 102,
-  OP_ELSE: 103,
-  OP_ENDIF: 104,
-  OP_VERIFY: 105,
-  OP_RETURN: 106,
-
-  // stack ops
-  OP_TOALTSTACK: 107,
-  OP_FROMALTSTACK: 108,
-  OP_2DROP: 109,
-  OP_2DUP: 110,
-  OP_3DUP: 111,
-  OP_2OVER: 112,
-  OP_2ROT: 113,
-  OP_2SWAP: 114,
-  OP_IFDUP: 115,
-  OP_DEPTH: 116,
-  OP_DROP: 117,
-  OP_DUP: 118,
-  OP_NIP: 119,
-  OP_OVER: 120,
-  OP_PICK: 121,
-  OP_ROLL: 122,
-  OP_ROT: 123,
-  OP_SWAP: 124,
-  OP_TUCK: 125,
-
-  // splice ops
-  OP_CAT: 126,
-  OP_SUBSTR: 127,
-  OP_LEFT: 128,
-  OP_RIGHT: 129,
-  OP_SIZE: 130,
-
-  // bit logic
-  OP_INVERT: 131,
-  OP_AND: 132,
-  OP_OR: 133,
-  OP_XOR: 134,
-  OP_EQUAL: 135,
-  OP_EQUALVERIFY: 136,
-  OP_RESERVED1: 137,
-  OP_RESERVED2: 138,
-
-  // numeric
-  OP_1ADD: 139,
-  OP_1SUB: 140,
-  OP_2MUL: 141,
-  OP_2DIV: 142,
-  OP_NEGATE: 143,
-  OP_ABS: 144,
-  OP_NOT: 145,
-  OP_0NOTEQUAL: 146,
-
-  OP_ADD: 147,
-  OP_SUB: 148,
-  OP_MUL: 149,
-  OP_DIV: 150,
-  OP_MOD: 151,
-  OP_LSHIFT: 152,
-  OP_RSHIFT: 153,
-
-  OP_BOOLAND: 154,
-  OP_BOOLOR: 155,
-  OP_NUMEQUAL: 156,
-  OP_NUMEQUALVERIFY: 157,
-  OP_NUMNOTEQUAL: 158,
-  OP_LESSTHAN: 159,
-  OP_GREATERTHAN: 160,
-  OP_LESSTHANOREQUAL: 161,
-  OP_GREATERTHANOREQUAL: 162,
-  OP_MIN: 163,
-  OP_MAX: 164,
-
-  OP_WITHIN: 165,
-
-  // crypto
-  OP_RIPEMD160: 166,
-  OP_SHA1: 167,
-  OP_SHA256: 168,
-  OP_HASH160: 169,
-  OP_HASH256: 170,
-  OP_CODESEPARATOR: 171,
-  OP_CHECKSIG: 172,
-  OP_CHECKSIGVERIFY: 173,
-  OP_CHECKMULTISIG: 174,
-  OP_CHECKMULTISIGVERIFY: 175,
-
-  // expansion
-  OP_NOP1: 176,
-  OP_NOP2: 177,
-  OP_NOP3: 178,
-  OP_NOP4: 179,
-  OP_NOP5: 180,
-  OP_NOP6: 181,
-  OP_NOP7: 182,
-  OP_NOP8: 183,
-  OP_NOP9: 184,
-  OP_NOP10: 185,
-
-  // template matching params
-  OP_PUBKEYHASH: 253,
-  OP_PUBKEY: 254,
-  OP_INVALIDOPCODE: 255
-}
-
-},{}],68:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var bufferutils = require('./bufferutils')
-var crypto = require('./crypto')
-var typeForce = require('typeforce')
-var opcodes = require('./opcodes')
+  var l = this._len += data.length
+  var s = this._s || 0
+  var f = 0
+  var buffer = this._block
 
-function Script (buffer, chunks) {
-  typeForce('Buffer', buffer)
-  typeForce('Array', chunks)
+  while (s < l) {
+    var t = Math.min(data.length, f + this._blockSize - (s % this._blockSize))
+    var ch = (t - f)
 
-  this.buffer = buffer
-  this.chunks = chunks
-}
+    for (var i = 0; i < ch; i++) {
+      buffer[(s % this._blockSize) + i] = data[i + f]
+    }
 
-Script.fromASM = function (asm) {
-  var strChunks = asm.split(' ')
-  var chunks = strChunks.map(function (strChunk) {
-    // opcode
-    if (strChunk in opcodes) {
-      return opcodes[strChunk]
+    s += ch
+    f += ch
 
-    // data chunk
-    } else {
-      return new Buffer(strChunk, 'hex')
+    if ((s % this._blockSize) === 0) {
+      this._update(buffer)
     }
-  })
+  }
+  this._s = s
 
-  return Script.fromChunks(chunks)
+  return this
 }
 
-Script.fromBuffer = function (buffer) {
-  var chunks = []
-  var i = 0
+Hash.prototype.digest = function (enc) {
+  // Suppose the length of the message M, in bits, is l
+  var l = this._len * 8
 
-  while (i < buffer.length) {
-    var opcode = buffer.readUInt8(i)
+  // Append the bit 1 to the end of the message
+  this._block[this._len % this._blockSize] = 0x80
 
-    // data chunk
-    if ((opcode > opcodes.OP_0) && (opcode <= opcodes.OP_PUSHDATA4)) {
-      var d = bufferutils.readPushDataInt(buffer, i)
+  // and then k zero bits, where k is the smallest non-negative solution to the equation (l + 1 + k) === finalSize mod blockSize
+  this._block.fill(0, this._len % this._blockSize + 1)
 
-      // did reading a pushDataInt fail? return non-chunked script
-      if (d === null) return new Script(buffer, [])
-      i += d.size
+  if (l % (this._blockSize * 8) >= this._finalSize * 8) {
+    this._update(this._block)
+    this._block.fill(0)
+  }
 
-      // attempt to read too much data?
-      if (i + d.number > buffer.length) return new Script(buffer, [])
+  // to this append the block which is equal to the number l written in binary
+  // TODO: handle case where l is > Math.pow(2, 29)
+  this._block.writeInt32BE(l, this._blockSize - 4)
 
-      var data = buffer.slice(i, i + d.number)
-      i += d.number
+  var hash = this._update(this._block) || this._hash()
 
-      chunks.push(data)
+  return enc ? hash.toString(enc) : hash
+}
 
-    // opcode
-    } else {
-      chunks.push(opcode)
+Hash.prototype._update = function () {
+  throw new Error('_update must be implemented by subclass')
+}
 
-      i += 1
-    }
-  }
+module.exports = Hash
 
-  return new Script(buffer, chunks)
-}
+}).call(this,require("buffer").Buffer)
+},{"buffer":4}],100:[function(require,module,exports){
+var exports = module.exports = function SHA (algorithm) {
+  algorithm = algorithm.toLowerCase()
 
-Script.fromChunks = function (chunks) {
-  typeForce('Array', chunks)
+  var Algorithm = exports[algorithm]
+  if (!Algorithm) throw new Error(algorithm + ' is not supported (we accept pull requests)')
 
-  var bufferSize = chunks.reduce(function (accum, chunk) {
-    // data chunk
-    if (Buffer.isBuffer(chunk)) {
-      return accum + bufferutils.pushDataSize(chunk.length) + chunk.length
-    }
+  return new Algorithm()
+}
 
-    // opcode
-    return accum + 1
-  }, 0.0)
+exports.sha = require('./sha')
+exports.sha1 = require('./sha1')
+exports.sha224 = require('./sha224')
+exports.sha256 = require('./sha256')
+exports.sha384 = require('./sha384')
+exports.sha512 = require('./sha512')
 
-  var buffer = new Buffer(bufferSize)
-  var offset = 0
+},{"./sha":101,"./sha1":102,"./sha224":103,"./sha256":104,"./sha384":105,"./sha512":106}],101:[function(require,module,exports){
+(function (Buffer){
+/*
+ * A JavaScript implementation of the Secure Hash Algorithm, SHA-0, as defined
+ * in FIPS PUB 180-1
+ * This source code is derived from sha1.js of the same repository.
+ * The difference between SHA-0 and SHA-1 is just a bitwise rotate left
+ * operation was added.
+ */
 
-  chunks.forEach(function (chunk) {
-    // data chunk
-    if (Buffer.isBuffer(chunk)) {
-      offset += bufferutils.writePushDataInt(buffer, chunk.length, offset)
+var inherits = require('inherits')
+var Hash = require('./hash')
 
-      chunk.copy(buffer, offset)
-      offset += chunk.length
+var K = [
+  0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
+]
 
-    // opcode
-    } else {
-      buffer.writeUInt8(chunk, offset)
-      offset += 1
-    }
-  })
+var W = new Array(80)
 
-  assert.equal(offset, buffer.length, 'Could not decode chunks')
-  return new Script(buffer, chunks)
-}
+function Sha () {
+  this.init()
+  this._w = W
 
-Script.fromHex = function (hex) {
-  return Script.fromBuffer(new Buffer(hex, 'hex'))
+  Hash.call(this, 64, 56)
 }
 
-Script.EMPTY = Script.fromChunks([])
+inherits(Sha, Hash)
 
-Script.prototype.getHash = function () {
-  return crypto.hash160(this.buffer)
-}
+Sha.prototype.init = function () {
+  this._a = 0x67452301
+  this._b = 0xefcdab89
+  this._c = 0x98badcfe
+  this._d = 0x10325476
+  this._e = 0xc3d2e1f0
 
-// FIXME: doesn't work for data chunks, maybe time to use buffertools.compare...
-Script.prototype.without = function (needle) {
-  return Script.fromChunks(this.chunks.filter(function (op) {
-    return op !== needle
-  }))
+  return this
 }
 
-var reverseOps = []
-for (var op in opcodes) {
-  var code = opcodes[op]
-  reverseOps[code] = op
+function rotl5 (num) {
+  return (num << 5) | (num >>> 27)
 }
 
-Script.prototype.toASM = function () {
-  return this.chunks.map(function (chunk) {
-    // data chunk
-    if (Buffer.isBuffer(chunk)) {
-      return chunk.toString('hex')
+function rotl30 (num) {
+  return (num << 30) | (num >>> 2)
+}
 
-    // opcode
-    } else {
-      return reverseOps[chunk]
-    }
-  }).join(' ')
+function ft (s, b, c, d) {
+  if (s === 0) return (b & c) | ((~b) & d)
+  if (s === 2) return (b & c) | (b & d) | (c & d)
+  return b ^ c ^ d
 }
 
-Script.prototype.toBuffer = function () {
-  return this.buffer
+Sha.prototype._update = function (M) {
+  var W = this._w
+
+  var a = this._a | 0
+  var b = this._b | 0
+  var c = this._c | 0
+  var d = this._d | 0
+  var e = this._e | 0
+
+  for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
+  for (; i < 80; ++i) W[i] = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16]
+
+  for (var j = 0; j < 80; ++j) {
+    var s = ~~(j / 20)
+    var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0
+
+    e = d
+    d = c
+    c = rotl30(b)
+    b = a
+    a = t
+  }
+
+  this._a = (a + this._a) | 0
+  this._b = (b + this._b) | 0
+  this._c = (c + this._c) | 0
+  this._d = (d + this._d) | 0
+  this._e = (e + this._e) | 0
 }
 
-Script.prototype.toHex = function () {
-  return this.toBuffer().toString('hex')
+Sha.prototype._hash = function () {
+  var H = new Buffer(20)
+
+  H.writeInt32BE(this._a | 0, 0)
+  H.writeInt32BE(this._b | 0, 4)
+  H.writeInt32BE(this._c | 0, 8)
+  H.writeInt32BE(this._d | 0, 12)
+  H.writeInt32BE(this._e | 0, 16)
+
+  return H
 }
 
-module.exports = Script
+module.exports = Sha
 
 }).call(this,require("buffer").Buffer)
-},{"./bufferutils":57,"./crypto":58,"./opcodes":67,"assert":5,"buffer":7,"typeforce":53}],69:[function(require,module,exports){
+},{"./hash":99,"buffer":4,"inherits":93}],102:[function(require,module,exports){
 (function (Buffer){
-var assert = require('assert')
-var ops = require('./opcodes')
-var typeForce = require('typeforce')
-
-var ecurve = require('ecurve')
-var curve = ecurve.getCurveByName('secp256k1')
+/*
+ * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
+ * in FIPS PUB 180-1
+ * Version 2.1a Copyright Paul Johnston 2000 - 2002.
+ * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+ * Distributed under the BSD License
+ * See http://pajhome.org.uk/crypt/md5 for details.
+ */
 
-var ECSignature = require('./ecsignature')
-var Script = require('./script')
+var inherits = require('inherits')
+var Hash = require('./hash')
 
-function isCanonicalPubKey (buffer) {
-  if (!Buffer.isBuffer(buffer)) return false
+var K = [
+  0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
+]
 
-  try {
-    ecurve.Point.decodeFrom(curve, buffer)
-  } catch (e) {
-    if (!(e.message.match(/Invalid sequence (length|tag)/)))
-      throw e
+var W = new Array(80)
 
-    return false
-  }
+function Sha1 () {
+  this.init()
+  this._w = W
 
-  return true
+  Hash.call(this, 64, 56)
 }
 
-function isCanonicalSignature (buffer) {
-  if (!Buffer.isBuffer(buffer)) return false
-
-  try {
-    ECSignature.parseScriptSignature(buffer)
-  } catch (e) {
-    if (!(e.message.match(/Not a DER sequence|Invalid sequence length|Expected a DER integer|R length is zero|S length is zero|R value excessively padded|S value excessively padded|R value is negative|S value is negative|Invalid hashType/))) {
-      throw e
-    }
+inherits(Sha1, Hash)
 
-    return false
-  }
+Sha1.prototype.init = function () {
+  this._a = 0x67452301
+  this._b = 0xefcdab89
+  this._c = 0x98badcfe
+  this._d = 0x10325476
+  this._e = 0xc3d2e1f0
 
-  return true
+  return this
 }
 
-function isPubKeyHashInput (script) {
-  return script.chunks.length === 2 &&
-    isCanonicalSignature(script.chunks[0]) &&
-    isCanonicalPubKey(script.chunks[1])
+function rotl1 (num) {
+  return (num << 1) | (num >>> 31)
 }
 
-function isPubKeyHashOutput (script) {
-  return script.chunks.length === 5 &&
-    script.chunks[0] === ops.OP_DUP &&
-    script.chunks[1] === ops.OP_HASH160 &&
-    Buffer.isBuffer(script.chunks[2]) &&
-    script.chunks[2].length === 20 &&
-    script.chunks[3] === ops.OP_EQUALVERIFY &&
-    script.chunks[4] === ops.OP_CHECKSIG
+function rotl5 (num) {
+  return (num << 5) | (num >>> 27)
 }
 
-function isPubKeyInput (script) {
-  return script.chunks.length === 1 &&
-    isCanonicalSignature(script.chunks[0])
+function rotl30 (num) {
+  return (num << 30) | (num >>> 2)
 }
 
-function isPubKeyOutput (script) {
-  return script.chunks.length === 2 &&
-    isCanonicalPubKey(script.chunks[0]) &&
-    script.chunks[1] === ops.OP_CHECKSIG
+function ft (s, b, c, d) {
+  if (s === 0) return (b & c) | ((~b) & d)
+  if (s === 2) return (b & c) | (b & d) | (c & d)
+  return b ^ c ^ d
 }
 
-function isScriptHashInput (script, allowIncomplete) {
-  if (script.chunks.length < 2) return false
+Sha1.prototype._update = function (M) {
+  var W = this._w
 
-  var lastChunk = script.chunks[script.chunks.length - 1]
-  if (!Buffer.isBuffer(lastChunk)) return false
+  var a = this._a | 0
+  var b = this._b | 0
+  var c = this._c | 0
+  var d = this._d | 0
+  var e = this._e | 0
 
-  var scriptSig = Script.fromChunks(script.chunks.slice(0, -1))
-  var redeemScript = Script.fromBuffer(lastChunk)
+  for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
+  for (; i < 80; ++i) W[i] = rotl1(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16])
 
-  // is redeemScript a valid script?
-  if (redeemScript.chunks.length === 0) return false
+  for (var j = 0; j < 80; ++j) {
+    var s = ~~(j / 20)
+    var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0
 
-  return classifyInput(scriptSig, allowIncomplete) === classifyOutput(redeemScript)
-}
+    e = d
+    d = c
+    c = rotl30(b)
+    b = a
+    a = t
+  }
 
-function isScriptHashOutput (script) {
-  return script.chunks.length === 3 &&
-    script.chunks[0] === ops.OP_HASH160 &&
-    Buffer.isBuffer(script.chunks[1]) &&
-    script.chunks[1].length === 20 &&
-    script.chunks[2] === ops.OP_EQUAL
+  this._a = (a + this._a) | 0
+  this._b = (b + this._b) | 0
+  this._c = (c + this._c) | 0
+  this._d = (d + this._d) | 0
+  this._e = (e + this._e) | 0
 }
 
-// allowIncomplete is to account for combining signatures
-// See https://github.com/bitcoin/bitcoin/blob/f425050546644a36b0b8e0eb2f6934a3e0f6f80f/src/script/sign.cpp#L195-L197
-function isMultisigInput (script, allowIncomplete) {
-  if (script.chunks.length < 2) return false
-  if (script.chunks[0] !== ops.OP_0) return false
+Sha1.prototype._hash = function () {
+  var H = new Buffer(20)
 
-  if (allowIncomplete) {
-    return script.chunks.slice(1).every(function (chunk) {
-      return chunk === ops.OP_0 || isCanonicalSignature(chunk)
-    })
-  }
+  H.writeInt32BE(this._a | 0, 0)
+  H.writeInt32BE(this._b | 0, 4)
+  H.writeInt32BE(this._c | 0, 8)
+  H.writeInt32BE(this._d | 0, 12)
+  H.writeInt32BE(this._e | 0, 16)
 
-  return script.chunks.slice(1).every(isCanonicalSignature)
+  return H
 }
 
-function isMultisigOutput (script) {
-  if (script.chunks.length < 4) return false
-  if (script.chunks[script.chunks.length - 1] !== ops.OP_CHECKMULTISIG) return false
+module.exports = Sha1
 
-  var mOp = script.chunks[0]
-  if (mOp === ops.OP_0) return false
-  if (mOp < ops.OP_1) return false
-  if (mOp > ops.OP_16) return false
+}).call(this,require("buffer").Buffer)
+},{"./hash":99,"buffer":4,"inherits":93}],103:[function(require,module,exports){
+(function (Buffer){
+/**
+ * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
+ * in FIPS 180-2
+ * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
+ * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+ *
+ */
 
-  var nOp = script.chunks[script.chunks.length - 2]
-  if (nOp === ops.OP_0) return false
-  if (nOp < ops.OP_1) return false
-  if (nOp > ops.OP_16) return false
+var inherits = require('inherits')
+var Sha256 = require('./sha256')
+var Hash = require('./hash')
 
-  var m = mOp - (ops.OP_1 - 1)
-  var n = nOp - (ops.OP_1 - 1)
-  if (n < m) return false
+var W = new Array(64)
 
-  var pubKeys = script.chunks.slice(1, -2)
-  if (n < pubKeys.length) return false
+function Sha224 () {
+  this.init()
 
-  return pubKeys.every(isCanonicalPubKey)
-}
+  this._w = W // new Array(64)
 
-function isNullDataOutput (script) {
-  return script.chunks[0] === ops.OP_RETURN
+  Hash.call(this, 64, 56)
 }
 
-function classifyOutput (script) {
-  typeForce('Script', script)
+inherits(Sha224, Sha256)
 
-  if (isPubKeyHashOutput(script)) {
-    return 'pubkeyhash'
-  } else if (isScriptHashOutput(script)) {
-    return 'scripthash'
-  } else if (isMultisigOutput(script)) {
-    return 'multisig'
-  } else if (isPubKeyOutput(script)) {
-    return 'pubkey'
-  } else if (isNullDataOutput(script)) {
-    return 'nulldata'
-  }
+Sha224.prototype.init = function () {
+  this._a = 0xc1059ed8
+  this._b = 0x367cd507
+  this._c = 0x3070dd17
+  this._d = 0xf70e5939
+  this._e = 0xffc00b31
+  this._f = 0x68581511
+  this._g = 0x64f98fa7
+  this._h = 0xbefa4fa4
 
-  return 'nonstandard'
+  return this
 }
 
-function classifyInput (script, allowIncomplete) {
-  typeForce('Script', script)
+Sha224.prototype._hash = function () {
+  var H = new Buffer(28)
 
-  if (isPubKeyHashInput(script)) {
-    return 'pubkeyhash'
-  } else if (isMultisigInput(script, allowIncomplete)) {
-    return 'multisig'
-  } else if (isScriptHashInput(script, allowIncomplete)) {
-    return 'scripthash'
-  } else if (isPubKeyInput(script)) {
-    return 'pubkey'
-  }
+  H.writeInt32BE(this._a, 0)
+  H.writeInt32BE(this._b, 4)
+  H.writeInt32BE(this._c, 8)
+  H.writeInt32BE(this._d, 12)
+  H.writeInt32BE(this._e, 16)
+  H.writeInt32BE(this._f, 20)
+  H.writeInt32BE(this._g, 24)
 
-  return 'nonstandard'
+  return H
 }
 
-// Standard Script Templates
-// {pubKey} OP_CHECKSIG
-function pubKeyOutput (pubKey) {
-  return Script.fromChunks([
-    pubKey.toBuffer(),
-    ops.OP_CHECKSIG
-  ])
-}
+module.exports = Sha224
 
-// OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
-function pubKeyHashOutput (hash) {
-  typeForce('Buffer', hash)
-
-  return Script.fromChunks([
-    ops.OP_DUP,
-    ops.OP_HASH160,
-    hash,
-    ops.OP_EQUALVERIFY,
-    ops.OP_CHECKSIG
-  ])
-}
+}).call(this,require("buffer").Buffer)
+},{"./hash":99,"./sha256":104,"buffer":4,"inherits":93}],104:[function(require,module,exports){
+(function (Buffer){
+/**
+ * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
+ * in FIPS 180-2
+ * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
+ * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+ *
+ */
 
-// OP_HASH160 {scriptHash} OP_EQUAL
-function scriptHashOutput (hash) {
-  typeForce('Buffer', hash)
+var inherits = require('inherits')
+var Hash = require('./hash')
 
-  return Script.fromChunks([
-    ops.OP_HASH160,
-    hash,
-    ops.OP_EQUAL
-  ])
-}
+var K = [
+  0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
+  0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
+  0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
+  0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
+  0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
+  0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
+  0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
+  0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
+  0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
+  0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
+  0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
+  0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
+  0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
+  0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
+  0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
+  0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
+]
 
-// m [pubKeys ...] n OP_CHECKMULTISIG
-function multisigOutput (m, pubKeys) {
-  typeForce(['ECPubKey'], pubKeys)
+var W = new Array(64)
 
-  assert(pubKeys.length >= m, 'Not enough pubKeys provided')
+function Sha256 () {
+  this.init()
 
-  var pubKeyBuffers = pubKeys.map(function (pubKey) {
-    return pubKey.toBuffer()
-  })
-  var n = pubKeys.length
+  this._w = W // new Array(64)
 
-  return Script.fromChunks([].concat(
-    (ops.OP_1 - 1) + m,
-    pubKeyBuffers,
-    (ops.OP_1 - 1) + n,
-    ops.OP_CHECKMULTISIG
-  ))
+  Hash.call(this, 64, 56)
 }
 
-// {signature}
-function pubKeyInput (signature) {
-  typeForce('Buffer', signature)
-
-  return Script.fromChunks([signature])
-}
+inherits(Sha256, Hash)
 
-// {signature} {pubKey}
-function pubKeyHashInput (signature, pubKey) {
-  typeForce('Buffer', signature)
+Sha256.prototype.init = function () {
+  this._a = 0x6a09e667
+  this._b = 0xbb67ae85
+  this._c = 0x3c6ef372
+  this._d = 0xa54ff53a
+  this._e = 0x510e527f
+  this._f = 0x9b05688c
+  this._g = 0x1f83d9ab
+  this._h = 0x5be0cd19
 
-  return Script.fromChunks([signature, pubKey.toBuffer()])
+  return this
 }
 
-// <scriptSig> {serialized scriptPubKey script}
-function scriptHashInput (scriptSig, scriptPubKey) {
-  return Script.fromChunks([].concat(
-    scriptSig.chunks,
-    scriptPubKey.toBuffer()
-  ))
+function ch (x, y, z) {
+  return z ^ (x & (y ^ z))
 }
 
-// OP_0 [signatures ...]
-function multisigInput (signatures, scriptPubKey) {
-  if (scriptPubKey) {
-    assert(isMultisigOutput(scriptPubKey))
-
-    var mOp = scriptPubKey.chunks[0]
-    var nOp = scriptPubKey.chunks[scriptPubKey.chunks.length - 2]
-    var m = mOp - (ops.OP_1 - 1)
-    var n = nOp - (ops.OP_1 - 1)
-
-    assert(signatures.length >= m, 'Not enough signatures provided')
-    assert(signatures.length <= n, 'Too many signatures provided')
-  }
-
-  return Script.fromChunks([].concat(ops.OP_0, signatures))
+function maj (x, y, z) {
+  return (x & y) | (z & (x | y))
 }
 
-function nullDataOutput (data) {
-  return Script.fromChunks([ops.OP_RETURN, data])
+function sigma0 (x) {
+  return (x >>> 2 | x << 30) ^ (x >>> 13 | x << 19) ^ (x >>> 22 | x << 10)
 }
 
-module.exports = {
-  isCanonicalPubKey: isCanonicalPubKey,
-  isCanonicalSignature: isCanonicalSignature,
-  isPubKeyHashInput: isPubKeyHashInput,
-  isPubKeyHashOutput: isPubKeyHashOutput,
-  isPubKeyInput: isPubKeyInput,
-  isPubKeyOutput: isPubKeyOutput,
-  isScriptHashInput: isScriptHashInput,
-  isScriptHashOutput: isScriptHashOutput,
-  isMultisigInput: isMultisigInput,
-  isMultisigOutput: isMultisigOutput,
-  isNullDataOutput: isNullDataOutput,
-  classifyOutput: classifyOutput,
-  classifyInput: classifyInput,
-  pubKeyOutput: pubKeyOutput,
-  pubKeyHashOutput: pubKeyHashOutput,
-  scriptHashOutput: scriptHashOutput,
-  multisigOutput: multisigOutput,
-  pubKeyInput: pubKeyInput,
-  pubKeyHashInput: pubKeyHashInput,
-  scriptHashInput: scriptHashInput,
-  multisigInput: multisigInput,
-  dataOutput: function (data) {
-    console.warn('dataOutput is deprecated, use nullDataOutput by 2.0.0')
-    return nullDataOutput(data)
-  },
-  nullDataOutput: nullDataOutput
+function sigma1 (x) {
+  return (x >>> 6 | x << 26) ^ (x >>> 11 | x << 21) ^ (x >>> 25 | x << 7)
 }
 
-}).call(this,require("buffer").Buffer)
-},{"./ecsignature":62,"./opcodes":67,"./script":68,"assert":5,"buffer":7,"ecurve":49,"typeforce":53}],70:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var bufferutils = require('./bufferutils')
-var crypto = require('./crypto')
-var typeForce = require('typeforce')
-var opcodes = require('./opcodes')
-var scripts = require('./scripts')
-
-var Address = require('./address')
-var ECSignature = require('./ecsignature')
-var Script = require('./script')
-
-function Transaction () {
-  this.version = 1
-  this.locktime = 0
-  this.ins = []
-  this.outs = []
+function gamma0 (x) {
+  return (x >>> 7 | x << 25) ^ (x >>> 18 | x << 14) ^ (x >>> 3)
 }
 
-Transaction.DEFAULT_SEQUENCE = 0xffffffff
-Transaction.SIGHASH_ALL = 0x01
-Transaction.SIGHASH_NONE = 0x02
-Transaction.SIGHASH_SINGLE = 0x03
-Transaction.SIGHASH_ANYONECANPAY = 0x80
+function gamma1 (x) {
+  return (x >>> 17 | x << 15) ^ (x >>> 19 | x << 13) ^ (x >>> 10)
+}
 
-Transaction.fromBuffer = function (buffer, __disableAssert) {
-  var offset = 0
-  function readSlice (n) {
-    offset += n
-    return buffer.slice(offset - n, offset)
-  }
+Sha256.prototype._update = function (M) {
+  var W = this._w
 
-  function readUInt32 () {
-    var i = buffer.readUInt32LE(offset)
-    offset += 4
-    return i
-  }
+  var a = this._a | 0
+  var b = this._b | 0
+  var c = this._c | 0
+  var d = this._d | 0
+  var e = this._e | 0
+  var f = this._f | 0
+  var g = this._g | 0
+  var h = this._h | 0
 
-  function readUInt64 () {
-    var i = bufferutils.readUInt64LE(buffer, offset)
-    offset += 8
-    return i
-  }
+  for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
+  for (; i < 64; ++i) W[i] = (gamma1(W[i - 2]) + W[i - 7] + gamma0(W[i - 15]) + W[i - 16]) | 0
 
-  function readVarInt () {
-    var vi = bufferutils.readVarInt(buffer, offset)
-    offset += vi.size
-    return vi.number
-  }
+  for (var j = 0; j < 64; ++j) {
+    var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + W[j]) | 0
+    var T2 = (sigma0(a) + maj(a, b, c)) | 0
 
-  function readScript () {
-    return Script.fromBuffer(readSlice(readVarInt()))
+    h = g
+    g = f
+    f = e
+    e = (d + T1) | 0
+    d = c
+    c = b
+    b = a
+    a = (T1 + T2) | 0
   }
 
-  function readGenerationScript () {
-    return new Script(readSlice(readVarInt()), [])
-  }
+  this._a = (a + this._a) | 0
+  this._b = (b + this._b) | 0
+  this._c = (c + this._c) | 0
+  this._d = (d + this._d) | 0
+  this._e = (e + this._e) | 0
+  this._f = (f + this._f) | 0
+  this._g = (g + this._g) | 0
+  this._h = (h + this._h) | 0
+}
 
-  var tx = new Transaction()
-  tx.version = readUInt32()
+Sha256.prototype._hash = function () {
+  var H = new Buffer(32)
 
-  var vinLen = readVarInt()
-  for (var i = 0; i < vinLen; ++i) {
-    var hash = readSlice(32)
-
-    if (Transaction.isCoinbaseHash(hash)) {
-      tx.ins.push({
-        hash: hash,
-        index: readUInt32(),
-        script: readGenerationScript(),
-        sequence: readUInt32()
-      })
-    } else {
-      tx.ins.push({
-        hash: hash,
-        index: readUInt32(),
-        script: readScript(),
-        sequence: readUInt32()
-      })
-    }
-  }
+  H.writeInt32BE(this._a, 0)
+  H.writeInt32BE(this._b, 4)
+  H.writeInt32BE(this._c, 8)
+  H.writeInt32BE(this._d, 12)
+  H.writeInt32BE(this._e, 16)
+  H.writeInt32BE(this._f, 20)
+  H.writeInt32BE(this._g, 24)
+  H.writeInt32BE(this._h, 28)
 
-  var voutLen = readVarInt()
-  for (i = 0; i < voutLen; ++i) {
-    tx.outs.push({
-      value: readUInt64(),
-      script: readScript()
-    })
-  }
+  return H
+}
 
-  tx.locktime = readUInt32()
+module.exports = Sha256
 
-  if (!__disableAssert) {
-    assert.equal(offset, buffer.length, 'Transaction has unexpected data')
-  }
+}).call(this,require("buffer").Buffer)
+},{"./hash":99,"buffer":4,"inherits":93}],105:[function(require,module,exports){
+(function (Buffer){
+var inherits = require('inherits')
+var SHA512 = require('./sha512')
+var Hash = require('./hash')
 
-  return tx
-}
+var W = new Array(160)
 
-Transaction.fromHex = function (hex) {
-  return Transaction.fromBuffer(new Buffer(hex, 'hex'))
-}
+function Sha384 () {
+  this.init()
+  this._w = W
 
-Transaction.isCoinbaseHash = function (buffer) {
-  return Array.prototype.every.call(buffer, function (x) {
-    return x === 0
-  })
+  Hash.call(this, 128, 112)
 }
 
-/**
- * Create a new txIn.
- *
- * Can be called with any of:
- *
- * - A transaction and an index
- * - A transaction hash and an index
- *
- * Note that this method does not sign the created input.
- */
-Transaction.prototype.addInput = function (hash, index, sequence, script) {
-  if (sequence === undefined || sequence === null) {
-    sequence = Transaction.DEFAULT_SEQUENCE
-  }
-
-  script = script || Script.EMPTY
-
-  if (typeof hash === 'string') {
-    // TxId hex is big-endian, we need little-endian
-    hash = bufferutils.reverse(new Buffer(hash, 'hex'))
-  } else if (hash instanceof Transaction) {
-    hash = hash.getHash()
-  }
+inherits(Sha384, SHA512)
 
-  typeForce('Buffer', hash)
-  typeForce('Number', index)
-  typeForce('Number', sequence)
-  typeForce('Script', script)
+Sha384.prototype.init = function () {
+  this._ah = 0xcbbb9d5d
+  this._bh = 0x629a292a
+  this._ch = 0x9159015a
+  this._dh = 0x152fecd8
+  this._eh = 0x67332667
+  this._fh = 0x8eb44a87
+  this._gh = 0xdb0c2e0d
+  this._hh = 0x47b5481d
 
-  assert.equal(hash.length, 32, 'Expected hash length of 32, got ' + hash.length)
+  this._al = 0xc1059ed8
+  this._bl = 0x367cd507
+  this._cl = 0x3070dd17
+  this._dl = 0xf70e5939
+  this._el = 0xffc00b31
+  this._fl = 0x68581511
+  this._gl = 0x64f98fa7
+  this._hl = 0xbefa4fa4
 
-  // Add the input and return the input's index
-  return (this.ins.push({
-    hash: hash,
-    index: index,
-    script: script,
-    sequence: sequence
-  }) - 1)
+  return this
 }
 
-/**
- * Create a new txOut.
- *
- * Can be called with:
- *
- * - A base58 address string and a value
- * - An Address object and a value
- * - A scriptPubKey Script and a value
- */
-Transaction.prototype.addOutput = function (scriptPubKey, value) {
-  // Attempt to get a valid address if it's a base58 address string
-  if (typeof scriptPubKey === 'string') {
-    scriptPubKey = Address.fromBase58Check(scriptPubKey)
-  }
+Sha384.prototype._hash = function () {
+  var H = new Buffer(48)
 
-  // Attempt to get a valid script if it's an Address object
-  if (scriptPubKey instanceof Address) {
-    scriptPubKey = scriptPubKey.toOutputScript()
+  function writeInt64BE (h, l, offset) {
+    H.writeInt32BE(h, offset)
+    H.writeInt32BE(l, offset + 4)
   }
 
-  typeForce('Script', scriptPubKey)
-  typeForce('Number', value)
+  writeInt64BE(this._ah, this._al, 0)
+  writeInt64BE(this._bh, this._bl, 8)
+  writeInt64BE(this._ch, this._cl, 16)
+  writeInt64BE(this._dh, this._dl, 24)
+  writeInt64BE(this._eh, this._el, 32)
+  writeInt64BE(this._fh, this._fl, 40)
 
-  // Add the output and return the output's index
-  return (this.outs.push({
-    script: scriptPubKey,
-    value: value
-  }) - 1)
+  return H
 }
 
-Transaction.prototype.clone = function () {
-  var newTx = new Transaction()
-  newTx.version = this.version
-  newTx.locktime = this.locktime
-
-  newTx.ins = this.ins.map(function (txIn) {
-    return {
-      hash: txIn.hash,
-      index: txIn.index,
-      script: txIn.script,
-      sequence: txIn.sequence
-    }
-  })
+module.exports = Sha384
 
-  newTx.outs = this.outs.map(function (txOut) {
-    return {
-      script: txOut.script,
-      value: txOut.value
-    }
-  })
+}).call(this,require("buffer").Buffer)
+},{"./hash":99,"./sha512":106,"buffer":4,"inherits":93}],106:[function(require,module,exports){
+(function (Buffer){
+var inherits = require('inherits')
+var Hash = require('./hash')
 
-  return newTx
-}
+var K = [
+  0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
+  0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
+  0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
+  0x923f82a4, 0xaf194f9b, 0xab1c5ed5, 0xda6d8118,
+  0xd807aa98, 0xa3030242, 0x12835b01, 0x45706fbe,
+  0x243185be, 0x4ee4b28c, 0x550c7dc3, 0xd5ffb4e2,
+  0x72be5d74, 0xf27b896f, 0x80deb1fe, 0x3b1696b1,
+  0x9bdc06a7, 0x25c71235, 0xc19bf174, 0xcf692694,
+  0xe49b69c1, 0x9ef14ad2, 0xefbe4786, 0x384f25e3,
+  0x0fc19dc6, 0x8b8cd5b5, 0x240ca1cc, 0x77ac9c65,
+  0x2de92c6f, 0x592b0275, 0x4a7484aa, 0x6ea6e483,
+  0x5cb0a9dc, 0xbd41fbd4, 0x76f988da, 0x831153b5,
+  0x983e5152, 0xee66dfab, 0xa831c66d, 0x2db43210,
+  0xb00327c8, 0x98fb213f, 0xbf597fc7, 0xbeef0ee4,
+  0xc6e00bf3, 0x3da88fc2, 0xd5a79147, 0x930aa725,
+  0x06ca6351, 0xe003826f, 0x14292967, 0x0a0e6e70,
+  0x27b70a85, 0x46d22ffc, 0x2e1b2138, 0x5c26c926,
+  0x4d2c6dfc, 0x5ac42aed, 0x53380d13, 0x9d95b3df,
+  0x650a7354, 0x8baf63de, 0x766a0abb, 0x3c77b2a8,
+  0x81c2c92e, 0x47edaee6, 0x92722c85, 0x1482353b,
+  0xa2bfe8a1, 0x4cf10364, 0xa81a664b, 0xbc423001,
+  0xc24b8b70, 0xd0f89791, 0xc76c51a3, 0x0654be30,
+  0xd192e819, 0xd6ef5218, 0xd6990624, 0x5565a910,
+  0xf40e3585, 0x5771202a, 0x106aa070, 0x32bbd1b8,
+  0x19a4c116, 0xb8d2d0c8, 0x1e376c08, 0x5141ab53,
+  0x2748774c, 0xdf8eeb99, 0x34b0bcb5, 0xe19b48a8,
+  0x391c0cb3, 0xc5c95a63, 0x4ed8aa4a, 0xe3418acb,
+  0x5b9cca4f, 0x7763e373, 0x682e6ff3, 0xd6b2b8a3,
+  0x748f82ee, 0x5defb2fc, 0x78a5636f, 0x43172f60,
+  0x84c87814, 0xa1f0ab72, 0x8cc70208, 0x1a6439ec,
+  0x90befffa, 0x23631e28, 0xa4506ceb, 0xde82bde9,
+  0xbef9a3f7, 0xb2c67915, 0xc67178f2, 0xe372532b,
+  0xca273ece, 0xea26619c, 0xd186b8c7, 0x21c0c207,
+  0xeada7dd6, 0xcde0eb1e, 0xf57d4f7f, 0xee6ed178,
+  0x06f067aa, 0x72176fba, 0x0a637dc5, 0xa2c898a6,
+  0x113f9804, 0xbef90dae, 0x1b710b35, 0x131c471b,
+  0x28db77f5, 0x23047d84, 0x32caab7b, 0x40c72493,
+  0x3c9ebe0a, 0x15c9bebc, 0x431d67c4, 0x9c100d4c,
+  0x4cc5d4be, 0xcb3e42b6, 0x597f299c, 0xfc657e2a,
+  0x5fcb6fab, 0x3ad6faec, 0x6c44198c, 0x4a475817
+]
 
-/**
- * Hash transaction for signing a specific input.
- *
- * Bitcoin uses a different hash for each signed transaction input. This
- * method copies the transaction, makes the necessary changes based on the
- * hashType, serializes and finally hashes the result. This hash can then be
- * used to sign the transaction input in question.
- */
-Transaction.prototype.hashForSignature = function (inIndex, prevOutScript, hashType) {
-  // FIXME: remove in 2.x.y
-  if (arguments[0] instanceof Script) {
-    console.warn('hashForSignature(prevOutScript, inIndex, ...) has been deprecated. Use hashForSignature(inIndex, prevOutScript, ...)')
+var W = new Array(160)
 
-    // swap the arguments (must be stored in tmp, arguments is special)
-    var tmp = arguments[0]
-    inIndex = arguments[1]
-    prevOutScript = tmp
-  }
+function Sha512 () {
+  this.init()
+  this._w = W
 
-  typeForce('Number', inIndex)
-  typeForce('Script', prevOutScript)
-  typeForce('Number', hashType)
+  Hash.call(this, 128, 112)
+}
 
-  assert(inIndex >= 0, 'Invalid vin index')
-  assert(inIndex < this.ins.length, 'Invalid vin index')
+inherits(Sha512, Hash)
 
-  var txTmp = this.clone()
-  var hashScript = prevOutScript.without(opcodes.OP_CODESEPARATOR)
+Sha512.prototype.init = function () {
+  this._ah = 0x6a09e667
+  this._bh = 0xbb67ae85
+  this._ch = 0x3c6ef372
+  this._dh = 0xa54ff53a
+  this._eh = 0x510e527f
+  this._fh = 0x9b05688c
+  this._gh = 0x1f83d9ab
+  this._hh = 0x5be0cd19
 
-  // Blank out other inputs' signatures
-  txTmp.ins.forEach(function (txIn) {
-    txIn.script = Script.EMPTY
-  })
-  txTmp.ins[inIndex].script = hashScript
+  this._al = 0xf3bcc908
+  this._bl = 0x84caa73b
+  this._cl = 0xfe94f82b
+  this._dl = 0x5f1d36f1
+  this._el = 0xade682d1
+  this._fl = 0x2b3e6c1f
+  this._gl = 0xfb41bd6b
+  this._hl = 0x137e2179
 
-  var hashTypeModifier = hashType & 0x1f
+  return this
+}
 
-  if (hashTypeModifier === Transaction.SIGHASH_NONE) {
-    assert(false, 'SIGHASH_NONE not yet supported')
-  } else if (hashTypeModifier === Transaction.SIGHASH_SINGLE) {
-    assert(false, 'SIGHASH_SINGLE not yet supported')
-  }
+function Ch (x, y, z) {
+  return z ^ (x & (y ^ z))
+}
 
-  if (hashType & Transaction.SIGHASH_ANYONECANPAY) {
-    assert(false, 'SIGHASH_ANYONECANPAY not yet supported')
-  }
+function maj (x, y, z) {
+  return (x & y) | (z & (x | y))
+}
 
-  var hashTypeBuffer = new Buffer(4)
-  hashTypeBuffer.writeInt32LE(hashType, 0)
+function sigma0 (x, xl) {
+  return (x >>> 28 | xl << 4) ^ (xl >>> 2 | x << 30) ^ (xl >>> 7 | x << 25)
+}
 
-  var buffer = Buffer.concat([txTmp.toBuffer(), hashTypeBuffer])
-  return crypto.hash256(buffer)
+function sigma1 (x, xl) {
+  return (x >>> 14 | xl << 18) ^ (x >>> 18 | xl << 14) ^ (xl >>> 9 | x << 23)
 }
 
-Transaction.prototype.getHash = function () {
-  return crypto.hash256(this.toBuffer())
+function Gamma0 (x, xl) {
+  return (x >>> 1 | xl << 31) ^ (x >>> 8 | xl << 24) ^ (x >>> 7)
 }
 
-Transaction.prototype.getId = function () {
-  // TxHash is little-endian, we need big-endian
-  return bufferutils.reverse(this.getHash()).toString('hex')
+function Gamma0l (x, xl) {
+  return (x >>> 1 | xl << 31) ^ (x >>> 8 | xl << 24) ^ (x >>> 7 | xl << 25)
 }
 
-Transaction.prototype.toBuffer = function () {
-  function scriptSize (script) {
-    var length = script.buffer.length
+function Gamma1 (x, xl) {
+  return (x >>> 19 | xl << 13) ^ (xl >>> 29 | x << 3) ^ (x >>> 6)
+}
 
-    return bufferutils.varIntSize(length) + length
-  }
+function Gamma1l (x, xl) {
+  return (x >>> 19 | xl << 13) ^ (xl >>> 29 | x << 3) ^ (x >>> 6 | xl << 26)
+}
 
-  var buffer = new Buffer(
-    8 +
-    bufferutils.varIntSize(this.ins.length) +
-    bufferutils.varIntSize(this.outs.length) +
-    this.ins.reduce(function (sum, input) { return sum + 40 + scriptSize(input.script) }, 0) +
-    this.outs.reduce(function (sum, output) { return sum + 8 + scriptSize(output.script) }, 0)
-  )
+function getCarry (a, b) {
+  return (a >>> 0) < (b >>> 0) ? 1 : 0
+}
 
-  var offset = 0
-  function writeSlice (slice) {
-    slice.copy(buffer, offset)
-    offset += slice.length
-  }
+Sha512.prototype._update = function (M) {
+  var W = this._w
 
-  function writeUInt32 (i) {
-    buffer.writeUInt32LE(i, offset)
-    offset += 4
-  }
+  var ah = this._ah | 0
+  var bh = this._bh | 0
+  var ch = this._ch | 0
+  var dh = this._dh | 0
+  var eh = this._eh | 0
+  var fh = this._fh | 0
+  var gh = this._gh | 0
+  var hh = this._hh | 0
 
-  function writeUInt64 (i) {
-    bufferutils.writeUInt64LE(buffer, i, offset)
-    offset += 8
-  }
+  var al = this._al | 0
+  var bl = this._bl | 0
+  var cl = this._cl | 0
+  var dl = this._dl | 0
+  var el = this._el | 0
+  var fl = this._fl | 0
+  var gl = this._gl | 0
+  var hl = this._hl | 0
 
-  function writeVarInt (i) {
-    var n = bufferutils.writeVarInt(buffer, i, offset)
-    offset += n
+  for (var i = 0; i < 32; i += 2) {
+    W[i] = M.readInt32BE(i * 4)
+    W[i + 1] = M.readInt32BE(i * 4 + 4)
   }
+  for (; i < 160; i += 2) {
+    var xh = W[i - 15 * 2]
+    var xl = W[i - 15 * 2 + 1]
+    var gamma0 = Gamma0(xh, xl)
+    var gamma0l = Gamma0l(xl, xh)
 
-  writeUInt32(this.version)
-  writeVarInt(this.ins.length)
+    xh = W[i - 2 * 2]
+    xl = W[i - 2 * 2 + 1]
+    var gamma1 = Gamma1(xh, xl)
+    var gamma1l = Gamma1l(xl, xh)
 
-  this.ins.forEach(function (txIn) {
-    writeSlice(txIn.hash)
-    writeUInt32(txIn.index)
-    writeVarInt(txIn.script.buffer.length)
-    writeSlice(txIn.script.buffer)
-    writeUInt32(txIn.sequence)
-  })
+    // W[i] = gamma0 + W[i - 7] + gamma1 + W[i - 16]
+    var Wi7h = W[i - 7 * 2]
+    var Wi7l = W[i - 7 * 2 + 1]
 
-  writeVarInt(this.outs.length)
-  this.outs.forEach(function (txOut) {
-    writeUInt64(txOut.value)
-    writeVarInt(txOut.script.buffer.length)
-    writeSlice(txOut.script.buffer)
-  })
+    var Wi16h = W[i - 16 * 2]
+    var Wi16l = W[i - 16 * 2 + 1]
 
-  writeUInt32(this.locktime)
+    var Wil = (gamma0l + Wi7l) | 0
+    var Wih = (gamma0 + Wi7h + getCarry(Wil, gamma0l)) | 0
+    Wil = (Wil + gamma1l) | 0
+    Wih = (Wih + gamma1 + getCarry(Wil, gamma1l)) | 0
+    Wil = (Wil + Wi16l) | 0
+    Wih = (Wih + Wi16h + getCarry(Wil, Wi16l)) | 0
 
-  return buffer
-}
+    W[i] = Wih
+    W[i + 1] = Wil
+  }
 
-Transaction.prototype.toHex = function () {
-  return this.toBuffer().toString('hex')
-}
+  for (var j = 0; j < 160; j += 2) {
+    Wih = W[j]
+    Wil = W[j + 1]
 
-Transaction.prototype.setInputScript = function (index, script) {
-  typeForce('Number', index)
-  typeForce('Script', script)
+    var majh = maj(ah, bh, ch)
+    var majl = maj(al, bl, cl)
 
-  this.ins[index].script = script
-}
+    var sigma0h = sigma0(ah, al)
+    var sigma0l = sigma0(al, ah)
+    var sigma1h = sigma1(eh, el)
+    var sigma1l = sigma1(el, eh)
 
-// FIXME: remove in 2.x.y
-Transaction.prototype.sign = function (index, privKey, hashType) {
-  console.warn('Transaction.prototype.sign is deprecated.  Use TransactionBuilder instead.')
+    // t1 = h + sigma1 + ch + K[j] + W[j]
+    var Kih = K[j]
+    var Kil = K[j + 1]
 
-  var prevOutScript = privKey.pub.getAddress().toOutputScript()
-  var signature = this.signInput(index, prevOutScript, privKey, hashType)
+    var chh = Ch(eh, fh, gh)
+    var chl = Ch(el, fl, gl)
 
-  var scriptSig = scripts.pubKeyHashInput(signature, privKey.pub)
-  this.setInputScript(index, scriptSig)
-}
+    var t1l = (hl + sigma1l) | 0
+    var t1h = (hh + sigma1h + getCarry(t1l, hl)) | 0
+    t1l = (t1l + chl) | 0
+    t1h = (t1h + chh + getCarry(t1l, chl)) | 0
+    t1l = (t1l + Kil) | 0
+    t1h = (t1h + Kih + getCarry(t1l, Kil)) | 0
+    t1l = (t1l + Wil) | 0
+    t1h = (t1h + Wih + getCarry(t1l, Wil)) | 0
 
-// FIXME: remove in 2.x.y
-Transaction.prototype.signInput = function (index, prevOutScript, privKey, hashType) {
-  console.warn('Transaction.prototype.signInput is deprecated.  Use TransactionBuilder instead.')
+    // t2 = sigma0 + maj
+    var t2l = (sigma0l + majl) | 0
+    var t2h = (sigma0h + majh + getCarry(t2l, sigma0l)) | 0
 
-  hashType = hashType || Transaction.SIGHASH_ALL
+    hh = gh
+    hl = gl
+    gh = fh
+    gl = fl
+    fh = eh
+    fl = el
+    el = (dl + t1l) | 0
+    eh = (dh + t1h + getCarry(el, dl)) | 0
+    dh = ch
+    dl = cl
+    ch = bh
+    cl = bl
+    bh = ah
+    bl = al
+    al = (t1l + t2l) | 0
+    ah = (t1h + t2h + getCarry(al, t1l)) | 0
+  }
 
-  var hash = this.hashForSignature(index, prevOutScript, hashType)
-  var signature = privKey.sign(hash)
+  this._al = (this._al + al) | 0
+  this._bl = (this._bl + bl) | 0
+  this._cl = (this._cl + cl) | 0
+  this._dl = (this._dl + dl) | 0
+  this._el = (this._el + el) | 0
+  this._fl = (this._fl + fl) | 0
+  this._gl = (this._gl + gl) | 0
+  this._hl = (this._hl + hl) | 0
 
-  return signature.toScriptSignature(hashType)
+  this._ah = (this._ah + ah + getCarry(this._al, al)) | 0
+  this._bh = (this._bh + bh + getCarry(this._bl, bl)) | 0
+  this._ch = (this._ch + ch + getCarry(this._cl, cl)) | 0
+  this._dh = (this._dh + dh + getCarry(this._dl, dl)) | 0
+  this._eh = (this._eh + eh + getCarry(this._el, el)) | 0
+  this._fh = (this._fh + fh + getCarry(this._fl, fl)) | 0
+  this._gh = (this._gh + gh + getCarry(this._gl, gl)) | 0
+  this._hh = (this._hh + hh + getCarry(this._hl, hl)) | 0
 }
 
-// FIXME: remove in 2.x.y
-Transaction.prototype.validateInput = function (index, prevOutScript, pubKey, buffer) {
-  console.warn('Transaction.prototype.validateInput is deprecated.  Use TransactionBuilder instead.')
+Sha512.prototype._hash = function () {
+  var H = new Buffer(64)
+
+  function writeInt64BE (h, l, offset) {
+    H.writeInt32BE(h, offset)
+    H.writeInt32BE(l, offset + 4)
+  }
 
-  var parsed = ECSignature.parseScriptSignature(buffer)
-  var hash = this.hashForSignature(index, prevOutScript, parsed.hashType)
+  writeInt64BE(this._ah, this._al, 0)
+  writeInt64BE(this._bh, this._bl, 8)
+  writeInt64BE(this._ch, this._cl, 16)
+  writeInt64BE(this._dh, this._dl, 24)
+  writeInt64BE(this._eh, this._el, 32)
+  writeInt64BE(this._fh, this._fl, 40)
+  writeInt64BE(this._gh, this._gl, 48)
+  writeInt64BE(this._hh, this._hl, 56)
 
-  return pubKey.verify(hash, parsed.signature)
+  return H
 }
 
-module.exports = Transaction
+module.exports = Sha512
 
 }).call(this,require("buffer").Buffer)
-},{"./address":54,"./bufferutils":57,"./crypto":58,"./ecsignature":62,"./opcodes":67,"./script":68,"./scripts":69,"assert":5,"buffer":7,"typeforce":53}],71:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var ops = require('./opcodes')
-var scripts = require('./scripts')
-
-var ECPubKey = require('./ecpubkey')
-var ECSignature = require('./ecsignature')
-var Script = require('./script')
-var Transaction = require('./transaction')
-
-function extractInput (txIn) {
-  var redeemScript
-  var scriptSig = txIn.script
-  var prevOutScript
-  var prevOutType = scripts.classifyInput(scriptSig, true)
-  var scriptType
-
-  // Re-classify if scriptHash
-  if (prevOutType === 'scripthash') {
-    redeemScript = Script.fromBuffer(scriptSig.chunks.slice(-1)[0])
-    prevOutScript = scripts.scriptHashOutput(redeemScript.getHash())
+},{"./hash":99,"buffer":4,"inherits":93}],107:[function(require,module,exports){
+var inherits = require('inherits')
+var native = require('./native')
 
-    scriptSig = Script.fromChunks(scriptSig.chunks.slice(0, -1))
-    scriptType = scripts.classifyInput(scriptSig, true)
-  } else {
-    scriptType = prevOutType
-  }
+function TfTypeError (type, value, valueTypeName) {
+  this.__error = Error.call(this)
+  this.__type = type
+  this.__value = value
+  this.__valueTypeName = valueTypeName
 
-  // Extract hashType, pubKeys and signatures
-  var hashType, parsed, pubKeys, signatures
+  var message
+  Object.defineProperty(this, 'message', {
+    enumerable: true,
+    get: function () {
+      if (message) return message
 
-  switch (scriptType) {
-    case 'pubkeyhash': {
-      parsed = ECSignature.parseScriptSignature(scriptSig.chunks[0])
-      hashType = parsed.hashType
-      pubKeys = [ECPubKey.fromBuffer(scriptSig.chunks[1])]
-      signatures = [parsed.signature]
-      prevOutScript = pubKeys[0].getAddress().toOutputScript()
+      valueTypeName = valueTypeName || getValueTypeName(value)
+      message = tfErrorString(type, value, valueTypeName)
 
-      break
+      return message
     }
+  })
+}
 
-    case 'pubkey': {
-      parsed = ECSignature.parseScriptSignature(scriptSig.chunks[0])
-      hashType = parsed.hashType
-      signatures = [parsed.signature]
+function TfPropertyTypeError (type, property, label, value, error, valueTypeName) {
+  this.__error = error || Error.call(this)
+  this.__label = label
+  this.__property = property
+  this.__type = type
+  this.__value = value
+  this.__valueTypeName = valueTypeName
 
-      if (redeemScript) {
-        pubKeys = [ECPubKey.fromBuffer(redeemScript.chunks[0])]
+  var message
+  Object.defineProperty(this, 'message', {
+    enumerable: true,
+    get: function () {
+      if (message) return message
+      if (type) {
+        valueTypeName = valueTypeName || getValueTypeName(value)
+        message = tfPropertyErrorString(type, label, property, value, valueTypeName)
+      } else {
+        message = 'Unexpected property "' + property + '"'
       }
 
-      break
+      return message
     }
+  })
+}
 
-    case 'multisig': {
-      signatures = scriptSig.chunks.slice(1).map(function (chunk) {
-        if (chunk === ops.OP_0) return chunk
-
-        var parsed = ECSignature.parseScriptSignature(chunk)
-        hashType = parsed.hashType
+// inherit from Error, assign stack
+[TfTypeError, TfPropertyTypeError].forEach(function (tfErrorType) {
+  inherits(tfErrorType, Error)
+  Object.defineProperty(tfErrorType, 'stack', {
+    get: function () { return this.__error.stack }
+  })
+})
 
-        return parsed.signature
-      })
+function tfCustomError (expected, actual) {
+  return new TfTypeError(expected, {}, actual)
+}
 
-      if (redeemScript) {
-        pubKeys = redeemScript.chunks.slice(1, -2).map(ECPubKey.fromBuffer)
-      }
+function tfSubError (e, property, label) {
+  // sub child?
+  if (e instanceof TfPropertyTypeError) {
+    property = property + '.' + e.__property
+    label = e.__label
 
-      break
-    }
+    return new TfPropertyTypeError(
+      e.__type, property, label, e.__value, e.__error, e.__valueTypeName
+    )
   }
 
-  return {
-    hashType: hashType,
-    prevOutScript: prevOutScript,
-    prevOutType: prevOutType,
-    pubKeys: pubKeys,
-    redeemScript: redeemScript,
-    scriptType: scriptType,
-    signatures: signatures
+  // child?
+  if (e instanceof TfTypeError) {
+    return new TfPropertyTypeError(
+      e.__type, property, label, e.__value, e.__error, e.__valueTypeName
+    )
   }
-}
 
-function TransactionBuilder () {
-  this.prevTxMap = {}
-  this.prevOutScripts = {}
-  this.prevOutTypes = {}
-
-  this.inputs = []
-  this.tx = new Transaction()
+  return e
 }
 
-TransactionBuilder.fromTransaction = function (transaction) {
-  var txb = new TransactionBuilder()
-
-  // Copy other transaction fields
-  txb.tx.version = transaction.version
-  txb.tx.locktime = transaction.locktime
+function getTypeName (fn) {
+  return fn.name || fn.toString().match(/function (.*?)\s*\(/)[1]
+}
 
-  // Extract/add inputs
-  transaction.ins.forEach(function (txIn) {
-    txb.addInput(txIn.hash, txIn.index, txIn.sequence)
-  })
+function getValueTypeName (value) {
+  return native.Nil(value) ? '' : getTypeName(value.constructor)
+}
 
-  // Extract/add outputs
-  transaction.outs.forEach(function (txOut) {
-    txb.addOutput(txOut.script, txOut.value)
-  })
+function getValue (value) {
+  if (native.Function(value)) return ''
+  if (native.String(value)) return JSON.stringify(value)
+  if (value && native.Object(value)) return ''
+  return value
+}
 
-  // Extract/add signatures
-  txb.inputs = transaction.ins.map(function (txIn) {
-    // TODO: remove me after testcase added
-    assert(!Transaction.isCoinbaseHash(txIn.hash), 'coinbase inputs not supported')
+function tfJSON (type) {
+  if (native.Function(type)) return type.toJSON ? type.toJSON() : getTypeName(type)
+  if (native.Array(type)) return 'Array'
+  if (type && native.Object(type)) return 'Object'
 
-    // Ignore empty scripts
-    if (txIn.script.buffer.length === 0) return {}
+  return type !== undefined ? type : ''
+}
 
-    return extractInput(txIn)
-  })
+function tfErrorString (type, value, valueTypeName) {
+  var valueJson = getValue(value)
 
-  return txb
+  return 'Expected ' + tfJSON(type) + ', got' +
+    (valueTypeName !== '' ? ' ' + valueTypeName : '') +
+    (valueJson !== '' ? ' ' + valueJson : '')
 }
 
-TransactionBuilder.prototype.addInput = function (prevTx, index, sequence, prevOutScript) {
-  var prevOutHash
-
-  // txId
-  if (typeof prevTx === 'string') {
-    prevOutHash = new Buffer(prevTx, 'hex')
+function tfPropertyErrorString (type, label, name, value, valueTypeName) {
+  var description = '" of type '
+  if (label === 'key') description = '" with key type '
 
-    // TxId hex is big-endian, we want little-endian hash
-    Array.prototype.reverse.call(prevOutHash)
+  return tfErrorString('property "' + tfJSON(name) + description + tfJSON(type), value, valueTypeName)
+}
 
-  // Transaction
-  } else if (prevTx instanceof Transaction) {
-    prevOutHash = prevTx.getHash()
-    prevOutScript = prevTx.outs[index].script
+module.exports = {
+  TfTypeError: TfTypeError,
+  TfPropertyTypeError: TfPropertyTypeError,
+  tfCustomError: tfCustomError,
+  tfSubError: tfSubError,
+  tfJSON: tfJSON,
+  getValueTypeName: getValueTypeName
+}
 
-  // txHash
-  } else {
-    prevOutHash = prevTx
-  }
+},{"./native":110,"inherits":93}],108:[function(require,module,exports){
+(function (Buffer){
+var NATIVE = require('./native')
+var ERRORS = require('./errors')
 
-  var input = {}
-  if (prevOutScript) {
-    var prevOutType = scripts.classifyOutput(prevOutScript)
+function _Buffer (value) {
+  return Buffer.isBuffer(value)
+}
 
-    // if we can, extract pubKey information
-    switch (prevOutType) {
-      case 'multisig': {
-        input.pubKeys = prevOutScript.chunks.slice(1, -2).map(ECPubKey.fromBuffer)
-        break
-      }
+function Hex (value) {
+  return typeof value === 'string' && /^([0-9a-f]{2})+$/i.test(value)
+}
 
-      case 'pubkey': {
-        input.pubKeys = prevOutScript.chunks.slice(0, 1).map(ECPubKey.fromBuffer)
-        break
-      }
-    }
+function _LengthN (type, length) {
+  var name = type.toJSON()
 
-    if (prevOutType !== 'scripthash') {
-      input.scriptType = prevOutType
-    }
+  function Length (value) {
+    if (!type(value)) return false
+    if (value.length === length) return true
 
-    input.prevOutScript = prevOutScript
-    input.prevOutType = prevOutType
+    throw ERRORS.tfCustomError(name + '(Length: ' + length + ')', name + '(Length: ' + value.length + ')')
   }
+  Length.toJSON = function () { return name }
 
-  assert(this.inputs.every(function (input2) {
-    if (input2.hashType === undefined) return true
+  return Length
+}
 
-    return input2.hashType & Transaction.SIGHASH_ANYONECANPAY
-  }), 'No, this would invalidate signatures')
+var _ArrayN = _LengthN.bind(null, NATIVE.Array)
+var _BufferN = _LengthN.bind(null, _Buffer)
+var _HexN = _LengthN.bind(null, Hex)
 
-  var prevOut = prevOutHash.toString('hex') + ':' + index
-  assert(!(prevOut in this.prevTxMap), 'Transaction is already an input')
+var UINT53_MAX = Math.pow(2, 53) - 1
 
-  var vin = this.tx.addInput(prevOutHash, index, sequence)
-  this.inputs[vin] = input
-  this.prevTxMap[prevOut] = vin
+function Finite (value) {
+  return typeof value === 'number' && isFinite(value)
+}
+function Int8 (value) { return ((value << 24) >> 24) === value }
+function Int16 (value) { return ((value << 16) >> 16) === value }
+function Int32 (value) { return (value | 0) === value }
+function UInt8 (value) { return (value & 0xff) === value }
+function UInt16 (value) { return (value & 0xffff) === value }
+function UInt32 (value) { return (value >>> 0) === value }
+function UInt53 (value) {
+  return typeof value === 'number' &&
+    value >= 0 &&
+    value <= UINT53_MAX &&
+    Math.floor(value) === value
+}
 
-  return vin
+var types = {
+  ArrayN: _ArrayN,
+  Buffer: _Buffer,
+  BufferN: _BufferN,
+  Finite: Finite,
+  Hex: Hex,
+  HexN: _HexN,
+  Int8: Int8,
+  Int16: Int16,
+  Int32: Int32,
+  UInt8: UInt8,
+  UInt16: UInt16,
+  UInt32: UInt32,
+  UInt53: UInt53
 }
 
-TransactionBuilder.prototype.addOutput = function (scriptPubKey, value) {
-  assert(this.inputs.every(function (input) {
-    if (input.hashType === undefined) return true
+for (var typeName in types) {
+  types[typeName].toJSON = function (t) {
+    return t
+  }.bind(null, typeName)
+}
 
-    return (input.hashType & 0x1f) === Transaction.SIGHASH_SINGLE
-  }), 'No, this would invalidate signatures')
+module.exports = types
 
-  return this.tx.addOutput(scriptPubKey, value)
-}
+}).call(this,{"isBuffer":require("../../../../../.nvm/versions/node/v6.0.0/lib/node_modules/browserify/node_modules/is-buffer/index.js")})
+},{"../../../../../.nvm/versions/node/v6.0.0/lib/node_modules/browserify/node_modules/is-buffer/index.js":9,"./errors":107,"./native":110}],109:[function(require,module,exports){
+var ERRORS = require('./errors')
+var NATIVE = require('./native')
 
-TransactionBuilder.prototype.build = function () {
-  return this.__build(false)
-}
-TransactionBuilder.prototype.buildIncomplete = function () {
-  return this.__build(true)
-}
+// short-hand
+var tfJSON = ERRORS.tfJSON
+var TfTypeError = ERRORS.TfTypeError
+var TfPropertyTypeError = ERRORS.TfPropertyTypeError
+var tfSubError = ERRORS.tfSubError
+var getValueTypeName = ERRORS.getValueTypeName
 
-var canSignTypes = {
-  'pubkeyhash': true,
-  'multisig': true,
-  'pubkey': true
-}
+var TYPES = {
+  arrayOf: function arrayOf (type) {
+    type = compile(type)
 
-TransactionBuilder.prototype.__build = function (allowIncomplete) {
-  if (!allowIncomplete) {
-    assert(this.tx.ins.length > 0, 'Transaction has no inputs')
-    assert(this.tx.outs.length > 0, 'Transaction has no outputs')
-  }
+    function _arrayOf (array, strict) {
+      if (!NATIVE.Array(array)) return false
 
-  var tx = this.tx.clone()
+      return array.every(function (value, i) {
+        try {
+          return typeforce(type, value, strict)
+        } catch (e) {
+          throw tfSubError(e, i)
+        }
+      })
+    }
+    _arrayOf.toJSON = function () { return '[' + tfJSON(type) + ']' }
 
-  // Create script signatures from signature meta-data
-  this.inputs.forEach(function (input, index) {
-    var scriptType = input.scriptType
-    var scriptSig
+    return _arrayOf
+  },
 
-    if (!allowIncomplete) {
-      assert(!!scriptType, 'Transaction is not complete')
-      assert(scriptType in canSignTypes, scriptType + ' not supported')
-      assert(input.signatures, 'Transaction is missing signatures')
+  maybe: function maybe (type) {
+    type = compile(type)
+
+    function _maybe (value, strict) {
+      return NATIVE.Nil(value) || type(value, strict, maybe)
     }
+    _maybe.toJSON = function () { return '?' + tfJSON(type) }
 
-    if (input.signatures) {
-      switch (scriptType) {
-        case 'pubkeyhash': {
-          var pkhSignature = input.signatures[0].toScriptSignature(input.hashType)
-          scriptSig = scripts.pubKeyHashInput(pkhSignature, input.pubKeys[0])
-          break
-        }
+    return _maybe
+  },
 
-        case 'multisig': {
-          // Array.prototype.map is sparse-compatible
-          var msSignatures = input.signatures.map(function (signature) {
-            return signature && signature.toScriptSignature(input.hashType)
-          })
+  map: function map (propertyType, propertyKeyType) {
+    propertyType = compile(propertyType)
+    if (propertyKeyType) propertyKeyType = compile(propertyKeyType)
 
-          // fill in blanks with OP_0
-          if (allowIncomplete) {
-            for (var i = 0; i < msSignatures.length; ++i) {
-              if (msSignatures[i]) continue
+    function _map (value, strict) {
+      if (!NATIVE.Object(value, strict)) return false
+      if (NATIVE.Nil(value, strict)) return false
 
-              msSignatures[i] = ops.OP_0
-            }
-          } else {
-            // Array.prototype.filter returns non-sparse array
-            msSignatures = msSignatures.filter(function (x) { return x })
+      for (var propertyName in value) {
+        try {
+          if (propertyKeyType) {
+            typeforce(propertyKeyType, propertyName, strict)
           }
-
-          var redeemScript = allowIncomplete ? undefined : input.redeemScript
-          scriptSig = scripts.multisigInput(msSignatures, redeemScript)
-          break
+        } catch (e) {
+          throw tfSubError(e, propertyName, 'key')
         }
 
-        case 'pubkey': {
-          var pkSignature = input.signatures[0].toScriptSignature(input.hashType)
-          scriptSig = scripts.pubKeyInput(pkSignature)
-          break
+        try {
+          var propertyValue = value[propertyName]
+          typeforce(propertyType, propertyValue, strict)
+        } catch (e) {
+          throw tfSubError(e, propertyName)
         }
       }
+
+      return true
     }
 
-    // did we build a scriptSig?
-    if (scriptSig) {
-      // wrap as scriptHash if necessary
-      if (input.prevOutType === 'scripthash') {
-        scriptSig = scripts.scriptHashInput(scriptSig, input.redeemScript)
+    if (propertyKeyType) {
+      _map.toJSON = function () {
+        return '{' + tfJSON(propertyKeyType) + ': ' + tfJSON(propertyType) + '}'
       }
-
-      tx.setInputScript(index, scriptSig)
+    } else {
+      _map.toJSON = function () { return '{' + tfJSON(propertyType) + '}' }
     }
-  })
-
-  return tx
-}
 
-TransactionBuilder.prototype.sign = function (index, privKey, redeemScript, hashType) {
-  assert(index in this.inputs, 'No input at index: ' + index)
-  hashType = hashType || Transaction.SIGHASH_ALL
+    return _map
+  },
 
-  var input = this.inputs[index]
-  var canSign = input.hashType &&
-    input.prevOutScript &&
-    input.prevOutType &&
-    input.pubKeys &&
-    input.scriptType &&
-    input.signatures
+  object: function object (uncompiled) {
+    var type = {}
 
-  // are we almost ready to sign?
-  if (canSign) {
-    // if redeemScript was provided, enforce consistency
-    if (redeemScript) {
-      assert.deepEqual(input.redeemScript, redeemScript, 'Inconsistent redeemScript')
+    for (var typePropertyName in uncompiled) {
+      type[typePropertyName] = compile(uncompiled[typePropertyName])
     }
 
-    assert.equal(input.hashType, hashType, 'Inconsistent hashType')
+    function _object (value, strict) {
+      if (!NATIVE.Object(value)) return false
+      if (NATIVE.Nil(value)) return false
 
-  // no? prepare
-  } else {
-    // must be pay-to-scriptHash?
-    if (redeemScript) {
-      // if we have a prevOutScript, enforce scriptHash equality to the redeemScript
-      if (input.prevOutScript) {
-        assert.equal(input.prevOutType, 'scripthash', 'PrevOutScript must be P2SH')
-
-        var scriptHash = input.prevOutScript.chunks[1]
-        assert.deepEqual(scriptHash, redeemScript.getHash(), 'RedeemScript does not match ' + scriptHash.toString('hex'))
-      }
+      var propertyName
 
-      var scriptType = scripts.classifyOutput(redeemScript)
-      assert(scriptType in canSignTypes, 'RedeemScript not supported (' + scriptType + ')')
+      try {
+        for (propertyName in type) {
+          var propertyType = type[propertyName]
+          var propertyValue = value[propertyName]
 
-      var pubKeys = []
-      switch (scriptType) {
-        case 'multisig': {
-          pubKeys = redeemScript.chunks.slice(1, -2).map(ECPubKey.fromBuffer)
-          break
+          typeforce(propertyType, propertyValue, strict)
         }
+      } catch (e) {
+        throw tfSubError(e, propertyName)
+      }
 
-        case 'pubkeyhash': {
-          var pkh1 = redeemScript.chunks[2]
-          var pkh2 = privKey.pub.getAddress().hash
-
-          assert.deepEqual(pkh1, pkh2, 'privateKey cannot sign for this input')
-          pubKeys = [privKey.pub]
-          break
-        }
+      if (strict) {
+        for (propertyName in value) {
+          if (type[propertyName]) continue
 
-        case 'pubkey': {
-          pubKeys = redeemScript.chunks.slice(0, 1).map(ECPubKey.fromBuffer)
-          break
+          throw new TfPropertyTypeError(undefined, propertyName)
         }
       }
 
-      if (!input.prevOutScript) {
-        input.prevOutScript = scripts.scriptHashOutput(redeemScript.getHash())
-        input.prevOutType = 'scripthash'
-      }
-
-      input.pubKeys = pubKeys
-      input.redeemScript = redeemScript
-      input.scriptType = scriptType
+      return true
+    }
+    _object.toJSON = function () { return tfJSON(type) }
 
-    // cannot be pay-to-scriptHash
-    } else {
-      assert.notEqual(input.prevOutType, 'scripthash', 'PrevOutScript is P2SH, missing redeemScript')
+    return _object
+  },
 
-      // can we otherwise sign this?
-      if (input.scriptType) {
-        assert(input.pubKeys, input.scriptType + ' not supported')
+  oneOf: function oneOf () {
+    var types = [].slice.call(arguments).map(compile)
 
-      // we know nothin' Jon Snow, assume pubKeyHash
-      } else {
-        input.prevOutScript = privKey.pub.getAddress().toOutputScript()
-        input.prevOutType = 'pubkeyhash'
-        input.pubKeys = [privKey.pub]
-        input.scriptType = input.prevOutType
-      }
+    function _oneOf (value, strict) {
+      return types.some(function (type) {
+        try {
+          return typeforce(type, value, strict)
+        } catch (e) {
+          return false
+        }
+      })
     }
+    _oneOf.toJSON = function () { return types.map(tfJSON).join('|') }
 
-    input.hashType = hashType
-    input.signatures = input.signatures || []
-  }
+    return _oneOf
+  },
 
-  var signatureScript = input.redeemScript || input.prevOutScript
-  var signatureHash = this.tx.hashForSignature(index, signatureScript, hashType)
+  quacksLike: function quacksLike (type) {
+    function _quacksLike (value) {
+      return type === getValueTypeName(value)
+    }
+    _quacksLike.toJSON = function () { return type }
 
-  // enforce signature order matches public keys
-  if (input.scriptType === 'multisig' && input.redeemScript && input.signatures.length !== input.pubKeys.length) {
-    // maintain a local copy of unmatched signatures
-    var unmatched = input.signatures.slice()
+    return _quacksLike
+  },
 
-    input.signatures = input.pubKeys.map(function (pubKey) {
-      var match
+  tuple: function tuple () {
+    var types = [].slice.call(arguments).map(compile)
 
-      // check for any matching signatures
-      unmatched.some(function (signature, i) {
-        if (!pubKey.verify(signatureHash, signature)) return false
-        match = signature
+    function _tuple (values, strict) {
+      return types.every(function (type, i) {
+        try {
+          return typeforce(type, values[i], strict)
+        } catch (e) {
+          throw tfSubError(e, i)
+        }
+      }) && (!strict || values.length === arguments.length)
+    }
+    _tuple.toJSON = function () { return '(' + types.map(tfJSON).join(', ') + ')' }
 
-        // remove matched signature from unmatched
-        unmatched.splice(i, 1)
+    return _tuple
+  },
 
-        return true
-      })
+  value: function value (expected) {
+    function _value (actual) {
+      return actual === expected
+    }
+    _value.toJSON = function () { return expected }
 
-      return match || undefined
-    })
+    return _value
   }
-
-  // enforce in order signing of public keys
-  assert(input.pubKeys.some(function (pubKey, i) {
-    if (!privKey.pub.Q.equals(pubKey.Q)) return false
-
-    assert(!input.signatures[i], 'Signature already exists')
-    var signature = privKey.sign(signatureHash)
-    input.signatures[i] = signature
-
-    return true
-  }, this), 'privateKey cannot sign for this input')
 }
 
-module.exports = TransactionBuilder
-
-}).call(this,require("buffer").Buffer)
-},{"./ecpubkey":61,"./ecsignature":62,"./opcodes":67,"./script":68,"./scripts":69,"./transaction":70,"assert":5,"buffer":7}],72:[function(require,module,exports){
-(function (Buffer){
-var assert = require('assert')
-var bufferutils = require('./bufferutils')
-var typeForce = require('typeforce')
-var networks = require('./networks')
-var randomBytes = require('randombytes')
-
-var Address = require('./address')
-var HDNode = require('./hdnode')
-var TransactionBuilder = require('./transaction_builder')
-var Script = require('./script')
-
-function Wallet (seed, network) {
-  console.warn('Wallet is deprecated and will be removed in 2.0.0, see #296')
-
-  seed = seed || randomBytes(32)
-  network = network || networks.bitcoin
-
-  // Stored in a closure to make accidental serialization less likely
-  var masterKey = HDNode.fromSeedBuffer(seed, network)
-
-  // HD first-level child derivation method should be hardened
-  // See https://bitcointalk.org/index.php?topic=405179.msg4415254#msg4415254
-  var accountZero = masterKey.deriveHardened(0)
-  var externalAccount = accountZero.derive(0)
-  var internalAccount = accountZero.derive(1)
-
-  this.addresses = []
-  this.changeAddresses = []
-  this.network = network
-  this.unspents = []
-
-  // FIXME: remove in 2.0.0
-  this.unspentMap = {}
-
-  // FIXME: remove in 2.0.0
-  var me = this
-  this.newMasterKey = function (seed) {
-    console.warn('newMasterKey is deprecated, please make a new Wallet instance instead')
-
-    seed = seed || randomBytes(32)
-    masterKey = HDNode.fromSeedBuffer(seed, network)
-
-    accountZero = masterKey.deriveHardened(0)
-    externalAccount = accountZero.derive(0)
-    internalAccount = accountZero.derive(1)
+function compile (type) {
+  if (NATIVE.String(type)) {
+    if (type[0] === '?') return TYPES.maybe(compile(type.slice(1)))
 
-    me.addresses = []
-    me.changeAddresses = []
+    return NATIVE[type] || TYPES.quacksLike(type)
+  } else if (type && NATIVE.Object(type)) {
+    if (NATIVE.Array(type)) return TYPES.arrayOf(compile(type[0]))
 
-    me.unspents = []
-    me.unspentMap = {}
+    return TYPES.object(type)
+  } else if (NATIVE.Function(type)) {
+    return type
   }
 
-  this.getMasterKey = function () {
-    return masterKey
-  }
-  this.getAccountZero = function () {
-    return accountZero
-  }
-  this.getExternalAccount = function () {
-    return externalAccount
-  }
-  this.getInternalAccount = function () {
-    return internalAccount
-  }
+  return TYPES.value(type)
 }
 
-Wallet.prototype.createTransaction = function (to, value, options) {
-  // FIXME: remove in 2.0.0
-  if (typeof options !== 'object') {
-    if (options !== undefined) {
-      console.warn('Non options object parameters are deprecated, use options object instead')
-
-      options = {
-        fixedFee: arguments[2],
-        changeAddress: arguments[3]
-      }
-    }
-  }
-
-  options = options || {}
-
-  assert(value > this.network.dustThreshold, value + ' must be above dust threshold (' + this.network.dustThreshold + ' Satoshis)')
-
-  var changeAddress = options.changeAddress
-  var fixedFee = options.fixedFee
-  var minConf = options.minConf === undefined ? 0 : options.minConf // FIXME: change minConf:1 by default in 2.0.0
-
-  // filter by minConf, then pending and sort by descending value
-  var unspents = this.unspents.filter(function (unspent) {
-    return unspent.confirmations >= minConf
-  }).filter(function (unspent) {
-    return !unspent.pending
-  }).sort(function (o1, o2) {
-    return o2.value - o1.value
-  })
-
-  var accum = 0
-  var addresses = []
-  var subTotal = value
-
-  var txb = new TransactionBuilder()
-  txb.addOutput(to, value)
+function typeforce (type, value, strict, surrogate) {
+  if (NATIVE.Function(type)) {
+    if (type(value, strict)) return true
 
-  for (var i = 0; i < unspents.length; ++i) {
-    var unspent = unspents[i]
-    addresses.push(unspent.address)
-
-    txb.addInput(unspent.txHash, unspent.index)
-
-    var fee = fixedFee === undefined ? estimatePaddedFee(txb.buildIncomplete(), this.network) : fixedFee
-
-    accum += unspent.value
-    subTotal = value + fee
-
-    if (accum >= subTotal) {
-      var change = accum - subTotal
-
-      if (change > this.network.dustThreshold) {
-        txb.addOutput(changeAddress || this.getChangeAddress(), change)
-      }
-
-      break
-    }
+    throw new TfTypeError(surrogate || type, value)
   }
 
-  assert(accum >= subTotal, 'Not enough funds (incl. fee): ' + accum + ' < ' + subTotal)
+  // JIT
+  return typeforce(compile(type), value, strict)
+}
 
-  return this.signWith(txb, addresses).build()
+// assign types to typeforce function
+for (var typeName in NATIVE) {
+  typeforce[typeName] = NATIVE[typeName]
 }
 
-// FIXME: remove in 2.0.0
-Wallet.prototype.processPendingTx = function (tx) {
-  this.__processTx(tx, true)
+for (typeName in TYPES) {
+  typeforce[typeName] = TYPES[typeName]
 }
 
-// FIXME: remove in 2.0.0
-Wallet.prototype.processConfirmedTx = function (tx) {
-  this.__processTx(tx, false)
+var EXTRA = require('./extra')
+for (typeName in EXTRA) {
+  typeforce[typeName] = EXTRA[typeName]
 }
 
-// FIXME: remove in 2.0.0
-Wallet.prototype.__processTx = function (tx, isPending) {
-  console.warn('processTransaction is considered harmful, see issue #260 for more information')
+// async wrapper
+function __async (type, value, strict, callback) {
+  // default to falsy strict if using shorthand overload
+  if (typeof strict === 'function') return __async(type, value, false, strict)
 
-  var txId = tx.getId()
-  var txHash = tx.getHash()
+  try {
+    typeforce(type, value, strict)
+  } catch (e) {
+    return callback(e)
+  }
 
-  tx.outs.forEach(function (txOut, i) {
-    var address
+  callback()
+}
 
-    try {
-      address = Address.fromOutputScript(txOut.script, this.network).toString()
-    } catch (e) {
-      if (!(e.message.match(/has no matching Address/)))
-        throw e
-    }
+typeforce.async = __async
+typeforce.compile = compile
+typeforce.TfTypeError = TfTypeError
+typeforce.TfPropertyTypeError = TfPropertyTypeError
 
-    var myAddresses = this.addresses.concat(this.changeAddresses)
-    if (myAddresses.indexOf(address) > -1) {
-      var lookup = txId + ':' + i
-      if (lookup in this.unspentMap) return
+module.exports = typeforce
 
-      // its unique, add it
-      var unspent = {
-        address: address,
-        confirmations: 0, // no way to determine this without more information
-        index: i,
-        txHash: txHash,
-        txId: txId,
-        value: txOut.value,
-        pending: isPending
-      }
+},{"./errors":107,"./extra":108,"./native":110}],110:[function(require,module,exports){
+var types = {
+  Array: function (value) { return value !== null && value !== undefined && value.constructor === Array },
+  Boolean: function (value) { return typeof value === 'boolean' },
+  Function: function (value) { return typeof value === 'function' },
+  Nil: function (value) { return value === undefined || value === null },
+  Number: function (value) { return typeof value === 'number' },
+  Object: function (value) { return typeof value === 'object' },
+  String: function (value) { return typeof value === 'string' },
+  '': function () { return true }
+}
 
-      this.unspentMap[lookup] = unspent
-      this.unspents.push(unspent)
-    }
-  }, this)
+// TODO: deprecate
+types.Null = types.Nil
 
-  tx.ins.forEach(function (txIn) {
-    // copy and convert to big-endian hex
-    var txInId = bufferutils.reverse(txIn.hash).toString('hex')
+for (var typeName in types) {
+  types[typeName].toJSON = function (t) {
+    return t
+  }.bind(null, typeName)
+}
 
-    var lookup = txInId + ':' + txIn.index
-    if (!(lookup in this.unspentMap)) return
+module.exports = types
 
-    var unspent = this.unspentMap[lookup]
+},{}],111:[function(require,module,exports){
+(function (Buffer){
+'use strict'
 
-    if (isPending) {
-      unspent.pending = true
-      unspent.spent = true
-    } else {
-      delete this.unspentMap[lookup]
+// Number.MAX_SAFE_INTEGER
+var MAX_SAFE_INTEGER = 9007199254740991
 
-      this.unspents = this.unspents.filter(function (unspent2) {
-        return unspent !== unspent2
-      })
-    }
-  }, this)
+function checkUInt53 (n) {
+  if (n < 0 || n > MAX_SAFE_INTEGER || n % 1 !== 0) throw new RangeError('value out of range')
 }
 
-Wallet.prototype.generateAddress = function () {
-  var k = this.addresses.length
-  var address = this.getExternalAccount().derive(k).getAddress()
+function encode (number, buffer, offset) {
+  checkUInt53(number)
 
-  this.addresses.push(address.toString())
+  if (!buffer) buffer = new Buffer(encodingLength(number))
+  if (!Buffer.isBuffer(buffer)) throw new TypeError('buffer must be a Buffer instance')
+  if (!offset) offset = 0
 
-  return this.getReceiveAddress()
-}
-
-Wallet.prototype.generateChangeAddress = function () {
-  var k = this.changeAddresses.length
-  var address = this.getInternalAccount().derive(k).getAddress()
+  // 8 bit
+  if (number < 0xfd) {
+    buffer.writeUInt8(number, offset)
+    encode.bytes = 1
 
-  this.changeAddresses.push(address.toString())
+  // 16 bit
+  } else if (number <= 0xffff) {
+    buffer.writeUInt8(0xfd, offset)
+    buffer.writeUInt16LE(number, offset + 1)
+    encode.bytes = 3
 
-  return this.getChangeAddress()
-}
+  // 32 bit
+  } else if (number <= 0xffffffff) {
+    buffer.writeUInt8(0xfe, offset)
+    buffer.writeUInt32LE(number, offset + 1)
+    encode.bytes = 5
 
-Wallet.prototype.getAddress = function () {
-  if (this.addresses.length === 0) {
-    this.generateAddress()
+  // 64 bit
+  } else {
+    buffer.writeUInt8(0xff, offset)
+    buffer.writeUInt32LE(number >>> 0, offset + 1)
+    buffer.writeUInt32LE((number / 0x100000000) | 0, offset + 5)
+    encode.bytes = 9
   }
 
-  return this.addresses[this.addresses.length - 1]
-}
-
-Wallet.prototype.getBalance = function (minConf) {
-  minConf = minConf || 0
-
-  return this.unspents.filter(function (unspent) {
-    return unspent.confirmations >= minConf
-
-      // FIXME: remove spent filter in 2.0.0
-  }).filter(function (unspent) {
-    return !unspent.spent
-  }).reduce(function (accum, unspent) {
-    return accum + unspent.value
-  }, 0)
+  return buffer
 }
 
-Wallet.prototype.getChangeAddress = function () {
-  if (this.changeAddresses.length === 0) {
-    this.generateChangeAddress()
-  }
+function decode (buffer, offset) {
+  if (!Buffer.isBuffer(buffer)) throw new TypeError('buffer must be a Buffer instance')
+  if (!offset) offset = 0
 
-  return this.changeAddresses[this.changeAddresses.length - 1]
-}
+  var first = buffer.readUInt8(offset)
 
-Wallet.prototype.getInternalPrivateKey = function (index) {
-  return this.getInternalAccount().derive(index).privKey
-}
+  // 8 bit
+  if (first < 0xfd) {
+    decode.bytes = 1
+    return first
 
-Wallet.prototype.getPrivateKey = function (index) {
-  return this.getExternalAccount().derive(index).privKey
-}
+  // 16 bit
+  } else if (first === 0xfd) {
+    decode.bytes = 3
+    return buffer.readUInt16LE(offset + 1)
 
-Wallet.prototype.getPrivateKeyForAddress = function (address) {
-  var index
+  // 32 bit
+  } else if (first === 0xfe) {
+    decode.bytes = 5
+    return buffer.readUInt32LE(offset + 1)
 
-  if ((index = this.addresses.indexOf(address)) > -1) {
-    return this.getPrivateKey(index)
-  }
+  // 64 bit
+  } else {
+    decode.bytes = 9
+    var lo = buffer.readUInt32LE(offset + 1)
+    var hi = buffer.readUInt32LE(offset + 5)
+    var number = hi * 0x0100000000 + lo
+    checkUInt53(number)
 
-  if ((index = this.changeAddresses.indexOf(address)) > -1) {
-    return this.getInternalPrivateKey(index)
+    return number
   }
-
-  assert(false, 'Unknown address. Make sure the address is from the keychain and has been generated')
 }
 
-Wallet.prototype.getUnspentOutputs = function (minConf) {
-  minConf = minConf || 0
+function encodingLength (number) {
+  checkUInt53(number)
 
-  return this.unspents.filter(function (unspent) {
-    return unspent.confirmations >= minConf
-
-      // FIXME: remove spent filter in 2.0.0
-  }).filter(function (unspent) {
-    return !unspent.spent
-  }).map(function (unspent) {
-    return {
-      address: unspent.address,
-      confirmations: unspent.confirmations,
-      index: unspent.index,
-      txId: unspent.txId,
-      value: unspent.value,
-
-      // FIXME: remove in 2.0.0
-      hash: unspent.txId,
-      pending: unspent.pending
-    }
-  })
+  return (
+    number < 0xfd ? 1
+  : number <= 0xffff ? 3
+  : number <= 0xffffffff ? 5
+  : 9
+  )
 }
 
-Wallet.prototype.setUnspentOutputs = function (unspents) {
-  this.unspentMap = {}
-  this.unspents = unspents.map(function (unspent) {
-    // FIXME: remove unspent.hash in 2.0.0
-    var txId = unspent.txId || unspent.hash
-    var index = unspent.index
-
-    // FIXME: remove in 2.0.0
-    if (unspent.hash !== undefined) {
-      console.warn('unspent.hash is deprecated, use unspent.txId instead')
-    }
-
-    // FIXME: remove in 2.0.0
-    if (index === undefined) {
-      console.warn('unspent.outputIndex is deprecated, use unspent.index instead')
-      index = unspent.outputIndex
-    }
+module.exports = { encode: encode, decode: decode, encodingLength: encodingLength }
 
-    typeForce('String', txId)
-    typeForce('Number', index)
-    typeForce('Number', unspent.value)
+}).call(this,require("buffer").Buffer)
+},{"buffer":4}],112:[function(require,module,exports){
+(function (Buffer){
+var bs58check = require('bs58check')
 
-    assert.equal(txId.length, 64, 'Expected valid txId, got ' + txId)
-    assert.doesNotThrow(function () {
-      Address.fromBase58Check(unspent.address)
-    }, 'Expected Base58 Address, got ' + unspent.address)
-    assert(isFinite(index), 'Expected finite index, got ' + index)
+function decodeRaw (buffer, version) {
+  // check version only if defined
+  if (version !== undefined && buffer[0] !== version) throw new Error('Invalid network version')
 
-    // FIXME: remove branch in 2.0.0
-    if (unspent.confirmations !== undefined) {
-      typeForce('Number', unspent.confirmations)
+  // uncompressed
+  if (buffer.length === 33) {
+    return {
+      version: buffer[0],
+      privateKey: buffer.slice(1, 33),
+      compressed: false
     }
+  }
 
-    var txHash = bufferutils.reverse(new Buffer(txId, 'hex'))
+  // invalid length
+  if (buffer.length !== 34) throw new Error('Invalid WIF length')
 
-    unspent = {
-      address: unspent.address,
-      confirmations: unspent.confirmations || 0,
-      index: index,
-      txHash: txHash,
-      txId: txId,
-      value: unspent.value,
+  // invalid compression flag
+  if (buffer[33] !== 0x01) throw new Error('Invalid compression flag')
 
-      // FIXME: remove in 2.0.0
-      pending: unspent.pending || false
-    }
+  return {
+    version: buffer[0],
+    privateKey: buffer.slice(1, 33),
+    compressed: true
+  }
+}
 
-    // FIXME: remove in 2.0.0
-    this.unspentMap[txId + ':' + index] = unspent
+function encodeRaw (version, privateKey, compressed) {
+  var result = new Buffer(compressed ? 34 : 33)
 
-    return unspent
-  }, this)
-}
+  result.writeUInt8(version, 0)
+  privateKey.copy(result, 1)
 
-Wallet.prototype.signWith = function (tx, addresses) {
-  addresses.forEach(function (address, i) {
-    var privKey = this.getPrivateKeyForAddress(address)
+  if (compressed) {
+    result[33] = 0x01
+  }
 
-    tx.sign(i, privKey)
-  }, this)
+  return result
+}
 
-  return tx
+function decode (string, version) {
+  return decodeRaw(bs58check.decode(string), version)
 }
 
-function estimatePaddedFee (tx, network) {
-  var tmpTx = tx.clone()
-  tmpTx.addOutput(Script.EMPTY, network.dustSoftThreshold || 0)
+function encode (version, privateKey, compressed) {
+  if (typeof version === 'number') return bs58check.encode(encodeRaw(version, privateKey, compressed))
 
-  return network.estimateFee(tmpTx)
+  return bs58check.encode(
+    encodeRaw(
+      version.version,
+      version.privateKey,
+      version.compressed
+    )
+  )
 }
 
-// FIXME: 1.0.0 shims, remove in 2.0.0
-Wallet.prototype.getReceiveAddress = Wallet.prototype.getAddress
-Wallet.prototype.createTx = Wallet.prototype.createTransaction
-
-module.exports = Wallet
+module.exports = {
+  decode: decode,
+  decodeRaw: decodeRaw,
+  encode: encode,
+  encodeRaw: encodeRaw
+}
 
 }).call(this,require("buffer").Buffer)
-},{"./address":54,"./bufferutils":57,"./hdnode":63,"./networks":66,"./script":68,"./transaction_builder":71,"assert":5,"buffer":7,"randombytes":52,"typeforce":53}]},{},[64])(64)
+},{"bs58check":80,"buffer":4}]},{},[33])(33)
 });</script>
-        <script>bitcoin.networks.shadow = {
-  magicPrefix: '\x19ShadowCash Signed Message:\n',
+        <script>bitcoinjs.bitcoin.networks.shadow = {
+  messagePrefix: "unused",
   bip32: {
     public: 0xEE80286A,
     private: 0xEE8031E8
@@ -19874,13 +22114,10 @@ module.exports = Wallet
   pubKeyHash: 0x3f,
   scriptHash: 0x7d,
   wif: 0xbf,
-  dustThreshold: 0,
-  feePerKb: 1000,
-  estimateFee: function() { return "unused in this app" },
 };
 
-bitcoin.networks.shadowtn = {
-  magicPrefix: '\x19ShadowCash Signed Message:\n',
+bitcoinjs.bitcoin.networks.shadowtn = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x76C0FDFB,
     private: 0x76C1077A
@@ -19888,21 +22125,32 @@ bitcoin.networks.shadowtn = {
   pubKeyHash: 0x7f,
   scriptHash: 0xc4,
   wif: 0xff,
-  dustThreshold: 0,
-  feePerKb: 1000,
-  estimateFee: function() { return "unused in this app" },
 };
 
-bitcoin.networks.clam = {
+bitcoinjs.bitcoin.networks.clam = {
+  messagePrefix: "unused",
   bip32: {
     public: 0xa8c26d64,
     private: 0xa8c17826
   },
   pubKeyHash: 0x89,
+  scriptHash: 0x00, // TODO set this correctly
   wif: 0x85,
 };
 
-bitcoin.networks.dash = {
+bitcoinjs.bitcoin.networks.crown = {
+  messagePrefix: "unused",
+  bip32: {
+    public: 0x0488b21e,
+    private: 0x0488ade4
+  },
+  pubKeyHash: 0x00,
+  scriptHash: 0x05,
+  wif: 0x80,
+};
+
+bitcoinjs.bitcoin.networks.dash = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x0488b21e,
     private: 0x0488ade4
@@ -19912,7 +22160,8 @@ bitcoin.networks.dash = {
   wif: 0xcc,
 };
 
-bitcoin.networks.dashtn = {
+bitcoinjs.bitcoin.networks.dashtn = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x043587cf,
     private: 0x04358394
@@ -19922,7 +22171,8 @@ bitcoin.networks.dashtn = {
   wif: 0xef,
 };
 
-bitcoin.networks.game = {
+bitcoinjs.bitcoin.networks.game = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x0488b21e,
     private: 0x0488ade4
@@ -19932,27 +22182,30 @@ bitcoin.networks.game = {
   wif: 0xa6,
 };
 
-bitcoin.networks.namecoin = {
+bitcoinjs.bitcoin.networks.namecoin = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x0488b21e,
     private: 0x0488ade4
   },
   pubKeyHash: 0x34,
-  //scriptHash: 0x10,
+  scriptHash: 0x00, // TODO set this correctly
   wif: 0x80,
 };
 
-bitcoin.networks.peercoin = {
+bitcoinjs.bitcoin.networks.peercoin = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x0488b21e,
     private: 0x0488ade4
   },
   pubKeyHash: 0x37,
-  //scriptHash: 0x10,
+  scriptHash: 0x00, // TODO set this correctly
   wif: 0xb7,
 };
 
-bitcoin.networks.slimcoin = {
+bitcoinjs.bitcoin.networks.slimcoin = {
+  messagePrefix: "unused",
   bip32: {
     public: 0xef6adf10,
     private: 0xef69ea80
@@ -19962,7 +22215,8 @@ bitcoin.networks.slimcoin = {
   wif: 0x46,
 };
 
-bitcoin.networks.slimcointn = {
+bitcoinjs.bitcoin.networks.slimcointn = {
+  messagePrefix: "unused",
   bip32: {
     public: 0x043587CF,
     private: 0x04358394
@@ -19972,6 +22226,104 @@ bitcoin.networks.slimcointn = {
   wif: 0x57,
 };
 
+bitcoinjs.bitcoin.networks.dogecoin = {
+  messagePrefix: '\x19Dogecoin Signed Message:\n',
+  bip32: {
+    public: 0x02facafd,
+    private: 0x02fac398
+  },
+  pubKeyHash: 0x1e,
+  scriptHash: 0x16,
+  wif: 0x9e,
+},
+
+bitcoinjs.bitcoin.networks.viacoin = {
+  messagePrefix: '\x18Viacoin Signed Message:\n',
+  bip32: {
+    public: 0x0488b21e,
+    private: 0x0488ade4
+  },
+  pubKeyHash: 0x47,
+  scriptHash: 0x21,
+  wif: 0xc7,
+},
+
+bitcoinjs.bitcoin.networks.viacointestnet = {
+  messagePrefix: '\x18Viacoin Signed Message:\n',
+  bip32: {
+    public: 0x043587cf,
+    private: 0x04358394
+  },
+  pubKeyHash: 0x7f,
+  scriptHash: 0xc4,
+  wif: 0xff,
+},
+
+bitcoinjs.bitcoin.networks.gamerscoin = {
+  messagePrefix: '\x19Gamerscoin Signed Message:\n',
+  bip32: {
+    public: 0x019da462,
+    private: 0x019d9cfe
+  },
+  pubKeyHash: 0x26,
+  scriptHash: 0x05,
+  wif: 0xA6,
+},
+
+bitcoinjs.bitcoin.networks.jumbucks = {
+  messagePrefix: '\x19Jumbucks Signed Message:\n',
+  bip32: {
+    public: 0x037a689a,
+    private: 0x037a6460
+  },
+  pubKeyHash: 0x2b,
+  scriptHash: 0x05,
+  wif: 0xab,
+},
+
+bitcoinjs.bitcoin.networks.zetacoin = {
+  messagePrefix: '\x18Zetacoin Signed Message:\n',
+  bip32: {
+    public: 0x0488b21e,
+    private: 0x0488ade4
+  },
+  pubKeyHash: 0x50,
+  scriptHash: 0x09,
+  wif: 0xe0,
+}
+
+bitcoinjs.bitcoin.networks.myriadcoin = {
+  messagePrefix: "unused",
+  bip32: {
+    public: 0x0488b21e,
+    private: 0x0488ade4
+  },
+  pubKeyHash: 0x32,
+  scriptHash: 0x00, // TODO set this correctly
+  wif: 0xb2,
+};
+
+bitcoinjs.bitcoin.networks.pivx = {
+  messagePrefix: "unused",
+  bip32: {
+    public: 0x022d2533,
+    private: 0x0221312b
+  },
+  pubKeyHash: 0x1e,
+  scriptHash: 0x0d,
+  wif: 0xd4,
+};
+
+bitcoinjs.bitcoin.networks.pivxtestnet = {
+  messagePrefix: "unused",
+  bip32: {
+    public: 0x3a8061a0,
+    private: 0x3a805837
+  },
+  pubKeyHash: 0x8b,
+  scriptHash: 0x13,
+  wif: 0xef,
+};
 </script>
         <script>(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.ethUtil = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 (function (global){
@@ -43740,7 +46092,7 @@ window.Entropy = new (function() {
     var seed = null;
     var bip32RootKey = null;
     var bip32ExtendedKey = null;
-    var network = bitcoin.networks.bitcoin;
+    var network = bitcoinjs.bitcoin.networks.bitcoin;
     var addressRowTemplate = $("#address-row-template");
 
     var showIndex = true;
@@ -43781,8 +46133,10 @@ window.Entropy = new (function() {
     DOM.extendedPubKey = $(".extended-pub-key");
     DOM.bip32tab = $("#bip32-tab");
     DOM.bip44tab = $("#bip44-tab");
+    DOM.bip49tab = $("#bip49-tab");
     DOM.bip32panel = $("#bip32");
     DOM.bip44panel = $("#bip44");
+    DOM.bip49panel = $("#bip49");
     DOM.bip32path = $("#bip32-path");
     DOM.bip44path = $("#bip44-path");
     DOM.bip44purpose = $("#bip44 .purpose");
@@ -43791,6 +46145,15 @@ window.Entropy = new (function() {
     DOM.bip44accountXprv = $("#bip44 .account-xprv");
     DOM.bip44accountXpub = $("#bip44 .account-xpub");
     DOM.bip44change = $("#bip44 .change");
+    DOM.bip49unavailable = $("#bip49 .unavailable");
+    DOM.bip49available = $("#bip49 .available");
+    DOM.bip49path = $("#bip49-path");
+    DOM.bip49purpose = $("#bip49 .purpose");
+    DOM.bip49coin = $("#bip49 .coin");
+    DOM.bip49account = $("#bip49 .account");
+    DOM.bip49accountXprv = $("#bip49 .account-xprv");
+    DOM.bip49accountXpub = $("#bip49 .account-xpub");
+    DOM.bip49change = $("#bip49 .change");
     DOM.generatedStrength = $(".generate-container .strength");
     DOM.hardenedAddresses = $(".hardened-addresses");
     DOM.addresses = $(".addresses");
@@ -43822,10 +46185,10 @@ window.Entropy = new (function() {
         DOM.more.on("click", showMore);
         DOM.rootKey.on("input", delayedRootKeyChanged);
         DOM.bip32path.on("input", calcForDerivationPath);
-        DOM.bip44purpose.on("input", calcForDerivationPath);
-        DOM.bip44coin.on("input", calcForDerivationPath);
         DOM.bip44account.on("input", calcForDerivationPath);
         DOM.bip44change.on("input", calcForDerivationPath);
+        DOM.bip49account.on("input", calcForDerivationPath);
+        DOM.bip49change.on("input", calcForDerivationPath);
         DOM.tab.on("shown.bs.tab", calcForDerivationPath);
         DOM.hardenedAddresses.on("change", calcForDerivationPath);
         DOM.indexToggle.on("click", toggleIndexes);
@@ -43844,8 +46207,17 @@ window.Entropy = new (function() {
     // Event handlers
 
     function networkChanged(e) {
+        clearDerivedKeys();
+        clearAddressesList();
         var networkIndex = e.target.value;
-        networks[networkIndex].onSelect();
+        var network = networks[networkIndex];
+        network.onSelect();
+        if (network.bip49available) {
+            showBip49();
+        }
+        else {
+            hideBip49();
+        }
         if (seed != null) {
             phraseChanged();
         }
@@ -43889,6 +46261,10 @@ window.Entropy = new (function() {
 
     function delayedPhraseChanged() {
         hideValidationError();
+        seed = null;
+        bip32RootKey = null;
+        bip32ExtendedKey = null;
+        clearAddressesList();
         showPending();
         if (phraseChangeTimeoutEvent != null) {
             clearTimeout(phraseChangeTimeoutEvent);
@@ -43898,7 +46274,6 @@ window.Entropy = new (function() {
 
     function phraseChanged() {
         showPending();
-        hideValidationError();
         setMnemonicLanguage();
         // Get the mnemonic phrase
         var phrase = DOM.phrase.val();
@@ -43911,7 +46286,6 @@ window.Entropy = new (function() {
         var passphrase = DOM.passphrase.val();
         calcBip32RootKeyFromSeed(phrase, passphrase);
         calcForDerivationPath();
-        hidePending();
     }
 
     function delayedEntropyChanged() {
@@ -43987,9 +46361,13 @@ window.Entropy = new (function() {
     }
 
     function calcForDerivationPath() {
-        showPending();
+        clearDerivedKeys();
         clearAddressesList();
-        hideValidationError();
+        showPending();
+        // Don't show bip49 if it's selected but network doesn't support it
+        if (bip49TabSelected() && !networkHasBip49()) {
+            return;
+        }
         // Get the derivation path
         var derivationPath = getDerivationPath();
         var errorText = findDerivationPathErrors(derivationPath);
@@ -44001,8 +46379,10 @@ window.Entropy = new (function() {
         if (bip44TabSelected()) {
             displayBip44Info();
         }
+        if (bip49TabSelected()) {
+            displayBip49Info();
+        }
         displayBip32Info();
-        hidePending();
     }
 
     function generateClicked() {
@@ -44072,11 +46452,11 @@ window.Entropy = new (function() {
 
     function calcBip32RootKeyFromSeed(phrase, passphrase) {
         seed = mnemonic.toSeed(phrase, passphrase);
-        bip32RootKey = bitcoin.HDNode.fromSeedHex(seed, network);
+        bip32RootKey = bitcoinjs.bitcoin.HDNode.fromSeedHex(seed, network);
     }
 
     function calcBip32RootKeyFromBase58(rootKeyBase58) {
-        bip32RootKey = bitcoin.HDNode.fromBase58(rootKeyBase58, network);
+        bip32RootKey = bitcoinjs.bitcoin.HDNode.fromBase58(rootKeyBase58, network);
     }
 
     function calcBip32ExtendedKey(path) {
@@ -44094,7 +46474,7 @@ window.Entropy = new (function() {
                 continue;
             }
             var hardened = bit[bit.length-1] == "'";
-            var isPriv = "privKey" in extendedKey;
+            var isPriv = !(extendedKey.isNeutered());
             var invalidDerivationPath = hardened && !isPriv;
             if (invalidDerivationPath) {
                 extendedKey = null;
@@ -44150,7 +46530,7 @@ window.Entropy = new (function() {
 
     function validateRootKey(rootKeyBase58) {
         try {
-            bitcoin.HDNode.fromBase58(rootKeyBase58);
+            bitcoinjs.bitcoin.HDNode.fromBase58(rootKeyBase58);
         }
         catch (e) {
             return "Invalid root key";
@@ -44174,6 +46554,21 @@ window.Entropy = new (function() {
             console.log("Using derivation path from BIP44 tab: " + derivationPath);
             return derivationPath;
         }
+        if (bip49TabSelected()) {
+            var purpose = parseIntNoNaN(DOM.bip49purpose.val(), 49);
+            var coin = parseIntNoNaN(DOM.bip49coin.val(), 0);
+            var account = parseIntNoNaN(DOM.bip49account.val(), 0);
+            var change = parseIntNoNaN(DOM.bip49change.val(), 0);
+            var path = "m/";
+            path += purpose + "'/";
+            path += coin + "'/";
+            path += account + "'/";
+            path += change;
+            DOM.bip49path.val(path);
+            var derivationPath = DOM.bip49path.val();
+            console.log("Using derivation path from BIP49 tab: " + derivationPath);
+            return derivationPath;
+        }
         else if (bip32TabSelected()) {
             var derivationPath = DOM.bip32path.val();
             console.log("Using derivation path from BIP32 tab: " + derivationPath);
@@ -44224,7 +46619,7 @@ window.Entropy = new (function() {
         }
         // Check no hardened derivation path when using xpub keys
         var hardened = path.indexOf("'") > -1;
-        var isXpubkey = !("privKey" in bip32RootKey);
+        var isXpubkey = bip32RootKey.isNeutered();
         if (hardened && isXpubkey) {
             return "Hardened derivation path is invalid with xpub key";
         }
@@ -44243,24 +46638,42 @@ window.Entropy = new (function() {
         // Calculate the account extended keys
         var accountExtendedKey = calcBip32ExtendedKey(path);
         var accountXprv = accountExtendedKey.toBase58();
-        var accountXpub = accountExtendedKey.toBase58(false);
+        var accountXpub = accountExtendedKey.neutered().toBase58();
         // Display the extended keys
         DOM.bip44accountXprv.val(accountXprv);
         DOM.bip44accountXpub.val(accountXpub);
     }
 
+    function displayBip49Info() {
+        // Get the derivation path for the account
+        var purpose = parseIntNoNaN(DOM.bip49purpose.val(), 49);
+        var coin = parseIntNoNaN(DOM.bip49coin.val(), 0);
+        var account = parseIntNoNaN(DOM.bip49account.val(), 0);
+        var path = "m/";
+        path += purpose + "'/";
+        path += coin + "'/";
+        path += account + "'/";
+        // Calculate the account extended keys
+        var accountExtendedKey = calcBip32ExtendedKey(path);
+        var accountXprv = accountExtendedKey.toBase58();
+        var accountXpub = accountExtendedKey.neutered().toBase58();
+        // Display the extended keys
+        DOM.bip49accountXprv.val(accountXprv);
+        DOM.bip49accountXpub.val(accountXpub);
+    }
+
     function displayBip32Info() {
         // Display the key
         DOM.seed.val(seed);
         var rootKey = bip32RootKey.toBase58();
         DOM.rootKey.val(rootKey);
         var xprvkeyB58 = "NA";
-        if (bip32ExtendedKey.privKey) {
+        if (!bip32ExtendedKey.isNeutered()) {
             xprvkeyB58 = bip32ExtendedKey.toBase58();
         }
         var extendedPrivKey = xprvkeyB58;
         DOM.extendedPrivKey.val(extendedPrivKey);
-        var extendedPubKey = bip32ExtendedKey.toBase58(false);
+        var extendedPubKey = bip32ExtendedKey.neutered().toBase58();
         DOM.extendedPubKey.val(extendedPubKey);
         // Display the addresses and privkeys
         clearAddressesList();
@@ -44276,21 +46689,25 @@ window.Entropy = new (function() {
                 for (var i=0; i<rows.length; i++) {
                     rows[i].shouldGenerate = false;
                 }
+                hidePending();
             }
 
             for (var i=0; i<total; i++) {
                 var index = i + start;
-                rows.push(new TableRow(index));
+                var isLast = i == total - 1;
+                rows.push(new TableRow(index, isLast));
             }
 
         })());
     }
 
-    function TableRow(index) {
+    function TableRow(index, isLast) {
 
         var self = this;
         this.shouldGenerate = true;
         var useHardenedAddresses = DOM.hardenedAddresses.prop("checked");
+        var isBip49 = bip49TabSelected();
+        var bip49available = networkHasBip49();
 
         function init() {
             calculateValues();
@@ -44301,7 +46718,7 @@ window.Entropy = new (function() {
                 if (!self.shouldGenerate) {
                     return;
                 }
-                var key = "";
+                var key = "NA";
                 if (useHardenedAddresses) {
                     key = bip32ExtendedKey.deriveHardened(index);
                 }
@@ -44310,17 +46727,17 @@ window.Entropy = new (function() {
                 }
                 var address = key.getAddress().toString();
                 var privkey = "NA";
-                if (key.privKey) {
-                    privkey = key.privKey.toWIF(network);
+                if (!key.isNeutered()) {
+                    privkey = key.keyPair.toWIF(network);
                 }
-                var pubkey = key.pubKey.toHex();
+                var pubkey = key.getPublicKeyBuffer().toString('hex');
                 var indexText = getDerivationPath() + "/" + index;
                 if (useHardenedAddresses) {
                     indexText = indexText + "'";
                 }
                 // Ethereum values are different
-                if (networks[DOM.network.val()].name == "Ethereum") {
-                    var privKeyBuffer = key.privKey.d.toBuffer();
+                if (networks[DOM.network.val()].name == "ETH - Ethereum") {
+                    var privKeyBuffer = key.keyPair.d.toBuffer();
                     privkey = privKeyBuffer.toString('hex');
                     var addressBuffer = ethUtil.privateToAddress(privKeyBuffer);
                     var hexAddress = addressBuffer.toString('hex');
@@ -44330,11 +46747,25 @@ window.Entropy = new (function() {
                     pubkey = ethUtil.addHexPrefix(pubkey);
                 }
                 // Ripple values are different
-                if (networks[DOM.network.val()].name == "Ripple") {
+                if (networks[DOM.network.val()].name == "XRP - Ripple") {
                     privkey = convertRipplePriv(privkey);
                     address = convertRippleAdrr(address);
                 }
+                // BIP49 addresses are different
+                if (isBip49) {
+                    if (!bip49available) {
+                        return;
+                    }
+                    var keyhash = bitcoinjs.bitcoin.crypto.hash160(key.getPublicKeyBuffer());
+                    var scriptsig = bitcoinjs.bitcoin.script.witnessPubKeyHash.output.encode(keyhash);
+                    var addressbytes = bitcoinjs.bitcoin.crypto.hash160(scriptsig);
+                    var scriptpubkey = bitcoinjs.bitcoin.script.scriptHash.output.encode(addressbytes);
+                    address = bitcoinjs.bitcoin.address.fromOutputScript(scriptpubkey, network)
+                }
                 addAddressToList(indexText, address, pubkey, privkey);
+                if (isLast) {
+                    hidePending();
+                }
             }, 50)
         }
 
@@ -44361,7 +46792,7 @@ window.Entropy = new (function() {
 
     function clearDisplay() {
         clearAddressesList();
-        clearKey();
+        clearKeys();
         hideValidationError();
     }
 
@@ -44377,10 +46808,20 @@ window.Entropy = new (function() {
         }
     }
 
-    function clearKey() {
+    function clearKeys() {
+        clearRootKey();
+        clearDerivedKeys();
+    }
+
+    function clearRootKey() {
         DOM.rootKey.val("");
+    }
+
+    function clearDerivedKeys() {
         DOM.extendedPrivKey.val("");
         DOM.extendedPubKey.val("");
+        DOM.bip44accountXprv.val("");
+        DOM.bip44accountXpub.val("");
     }
 
     function addAddressToList(indexText, address, pubkey, privkey) {
@@ -44468,6 +46909,9 @@ window.Entropy = new (function() {
             var option = $("<option>");
             option.attr("value", i);
             option.text(network.name);
+            if (network.name == "BTC - Bitcoin") {
+                option.prop("selected", true);
+            }
             DOM.phraseNetwork.append(option);
         }
     }
@@ -44789,140 +47233,222 @@ window.Entropy = new (function() {
         return DOM.bip32tab.hasClass("active");
     }
 
+    function networkHasBip49() {
+        return networks[DOM.network.val()].bip49available;
+    }
+
+    function bip49TabSelected() {
+        return DOM.bip49tab.hasClass("active");
+    }
+
+    function setHdCoin(coinValue) {
+        DOM.bip44coin.val(coinValue);
+        DOM.bip49coin.val(coinValue);
+    }
+
+    function showBip49() {
+        DOM.bip49unavailable.addClass("hidden");
+        DOM.bip49available.removeClass("hidden");
+    }
+
+    function hideBip49() {
+        DOM.bip49available.addClass("hidden");
+        DOM.bip49unavailable.removeClass("hidden");
+    }
+
     var networks = [
         {
-            name: "Bitcoin",
+            name: "BCH - Bitcoin Cash",
+            bip49available: false,
+            onSelect: function() {
+                network = bitcoinjs.bitcoin.networks.bitcoin;
+                setHdCoin(145);
+            },
+        },
+        {
+            name: "BTC - Bitcoin",
+            bip49available: true,
             onSelect: function() {
-                network = bitcoin.networks.bitcoin;
-                DOM.bip44coin.val(0);
+                network = bitcoinjs.bitcoin.networks.bitcoin;
+                setHdCoin(0);
             },
         },
         {
-            name: "Bitcoin Testnet",
+            name: "BTC - Bitcoin Testnet",
+            bip49available: true,
             onSelect: function() {
-                network = bitcoin.networks.testnet;
-                DOM.bip44coin.val(1);
+                network = bitcoinjs.bitcoin.networks.testnet;
+                setHdCoin(1);
             },
         },
         {
-            name: "CLAM",
+            name: "CLAM - Clams",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.clam;
-                DOM.bip44coin.val(23);
+                network = bitcoinjs.bitcoin.networks.clam;
+                setHdCoin(23);
             },
         },
         {
-            name: "Dogecoin",
+            name: "CRW - Crown",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.dogecoin;
-                DOM.bip44coin.val(3);
+                network = bitcoinjs.bitcoin.networks.crown;
+                setHdCoin(72);
             },
         },
         {
-            name: "DASH",
+            name: "DASH - Dash",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.dash;
-                DOM.bip44coin.val(5);
+                network = bitcoinjs.bitcoin.networks.dash;
+                setHdCoin(5);
             },
         },
         {
-            name: "DASH Testnet",
+            name: "DASH - Dash Testnet",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.dashtn;
-                DOM.bip44coin.val(1);
+                network = bitcoinjs.bitcoin.networks.dashtn;
+                setHdCoin(1);
             },
         },
         {
-            name: "Ethereum",
+            name: "DOGE - Dogecoin",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.bitcoin;
-                DOM.bip44coin.val(60);
+                network = bitcoinjs.bitcoin.networks.dogecoin;
+                setHdCoin(3);
             },
         },
         {
-            name: "GAME",
+            name: "ETH - Ethereum",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.game;
-                DOM.bip44coin.val(101);
+                network = bitcoinjs.bitcoin.networks.bitcoin;
+                setHdCoin(60);
             },
         },
         {
-            name: "Jumbucks",
+            name: "GAME - GameCredits",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.jumbucks;
-                DOM.bip44coin.val(26);
+                network = bitcoinjs.bitcoin.networks.game;
+                setHdCoin(101);
             },
         },
         {
-            name: "Litecoin",
+            name: "JBS - Jumbucks",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.litecoin;
-                DOM.bip44coin.val(2);
+                network = bitcoinjs.bitcoin.networks.jumbucks;
+                setHdCoin(26);
             },
         },
         {
-            name: "Namecoin",
+            name: "LTC - Litecoin",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.namecoin;
-                DOM.bip44coin.val(7);
+                network = bitcoinjs.bitcoin.networks.litecoin;
+                setHdCoin(2);
             },
         },
         {
-            name: "Peercoin",
+            name: "NMC - Namecoin",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.peercoin;
-                DOM.bip44coin.val(6);
+                network = bitcoinjs.bitcoin.networks.namecoin;
+                setHdCoin(7);
             },
         },
         {
-            name: "Ripple",
+            name: "PIVX - PIVX",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.bitcoin;
-                DOM.bip44coin.val(144);
+                network = bitcoinjs.bitcoin.networks.pivx;
+                setHdCoin(119);
             },
         },
         {
-            name: "ShadowCash",
+            name: "PIVX - PIVX Testnet",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.shadow;
-                DOM.bip44coin.val(35);
+                network = bitcoinjs.bitcoin.networks.pivxtestnet;
+                setHdCoin(1);
             },
         },
         {
-            name: "ShadowCash Testnet",
+            name: "PPC - Peercoin",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.shadowtn;
-                DOM.bip44coin.val(1);
+                network = bitcoinjs.bitcoin.networks.peercoin;
+                setHdCoin(6);
             },
         },
         {
-            name: "Slimcoin",
+            name: "SDC - ShadowCash",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.slimcoin;
-                DOM.bip44coin.val(63);
+                network = bitcoinjs.bitcoin.networks.shadow;
+                setHdCoin(35);
             },
         },
         {
-            name: "Slimcoin Testnet",
+            name: "SDC - ShadowCash Testnet",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.slimcointn;
-                DOM.bip44coin.val(111);
+                network = bitcoinjs.bitcoin.networks.shadowtn;
+                setHdCoin(1);
             },
         },
         {
-            name: "Viacoin",
+            name: "SLM - Slimcoin",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.viacoin;
-                DOM.bip44coin.val(14);
+                network = bitcoinjs.bitcoin.networks.slimcoin;
+                setHdCoin(63);
             },
         },
         {
-            name: "Viacoin Testnet",
+            name: "SLM - Slimcoin Testnet",
+            bip49available: false,
             onSelect: function() {
-                network = bitcoin.networks.viacointestnet;
-                DOM.bip44coin.val(1);
+                network = bitcoinjs.bitcoin.networks.slimcointn;
+                setHdCoin(111);
             },
         },
+        {
+            name: "VIA - Viacoin",
+            bip49available: false,
+            onSelect: function() {
+                network = bitcoinjs.bitcoin.networks.viacoin;
+                setHdCoin(14);
+            },
+        },
+        {
+            name: "VIA - Viacoin Testnet",
+            bip49available: false,
+            onSelect: function() {
+                network = bitcoinjs.bitcoin.networks.viacointestnet;
+                setHdCoin(1);
+            },
+        },
+        {
+            name: "XMY - Myriadcoin",
+            bip49available: false,
+            onSelect: function() {
+                network = bitcoinjs.bitcoin.networks.myriadcoin;
+                setHdCoin(90);
+            },
+        },
+        {
+            name: "XRP - Ripple",
+            bip49available: false,
+            onSelect: function() {
+                network = bitcoinjs.bitcoin.networks.bitcoin;
+                setHdCoin(144);
+            },
+        }
     ]
 
     var clients = [