build tx using BWU

lib/model/txproposal.js

@@ -2,7 +2,8 @@
 
 var _ = require('lodash');
 var Uuid = require('uuid');
-var Bitcore = require('bitcore-wallet-utils').Bitcore;
+var WalletUtils = require('bitcore-wallet-utils');
+var Bitcore = WalletUtils.Bitcore;
 var Address = Bitcore.Address;
 
 var TxProposalAction = require('./txproposalaction');
@@ -89,16 +90,7 @@ TxProposal.prototype._getCurrentSignatures = function() {
 TxProposal.prototype.getBitcoreTx = function() {
   var self = this;
 
-  var t = new Bitcore.Transaction();
-
-  _.each(this.inputs, function(i) {
-    t.from(i, i.publicKeys, self.requiredSignatures)
-  });
-
-  t.to(this.toAddress, this.amount)
-    .change(this.changeAddress.address);
-
-  t._updateChangeOutput();
+  var t = WalletUtils.buildTx(this);
 
   var sigs = this._getCurrentSignatures();
   _.each(sigs, function(x) {