self.toSeed = function(mnemonic, passphrase) {
passphrase = passphrase || '';
mnemonic = self.joinWords(self.splitWords(mnemonic)); // removes duplicate blanks
self.toSeed = function(mnemonic, passphrase) {
passphrase = passphrase || '';
mnemonic = self.joinWords(self.splitWords(mnemonic)); // removes duplicate blanks