diff --git a/lib/model/address.js b/lib/model/address.js
index 8ef4db0..a5da342 100644
--- a/lib/model/address.js
+++ b/lib/model/address.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var Bitcore = require('bitcore');
+var Bitcore = require('bitcore-wallet-utils').Bitcore;
 
 function Address() {
   this.version = '1.0.0';
diff --git a/lib/model/copayer.js b/lib/model/copayer.js
index 1cfffd4..830a55f 100644
--- a/lib/model/copayer.js
+++ b/lib/model/copayer.js
@@ -4,12 +4,11 @@ var $ = require('preconditions').singleton();
 var _ = require('lodash');
 var util = require('util');
 
-var Bitcore = require('bitcore');
-var HDPublicKey = Bitcore.HDPublicKey;
 var Uuid = require('uuid');
 var AddressManager = require('./addressmanager');
 var WalletUtils = require('bitcore-wallet-utils');
-
+var Bitcore = WalletUtils.Bitcore;
+var HDPublicKey = Bitcore.HDPublicKey;
 
 function Copayer() {
   this.version = '1.0.0';
diff --git a/lib/model/txproposal.js b/lib/model/txproposal.js
index ef77ec4..1846e50 100644
--- a/lib/model/txproposal.js
+++ b/lib/model/txproposal.js
@@ -2,7 +2,8 @@
 
 var _ = require('lodash');
 var Uuid = require('uuid');
-var Bitcore = require('bitcore');
+var WalletUtils = require('bitcore-wallet-utils');
+var Bitcore = WalletUtils.Bitcore;
 var Address = Bitcore.Address;
 
 var TxProposalAction = require('./txproposalaction');
@@ -31,6 +32,7 @@ TxProposal.create = function(opts) {
   x.requiredRejections = opts.requiredRejections;
   x.status = 'pending';
   x.actions = [];
+  x.outputOrder = _.shuffle(_.range(2));
 
   return x;
 };
@@ -57,6 +59,7 @@ TxProposal.fromObj = function(obj) {
   x.actions = _.map(obj.actions, function(action) {
     return TxProposalAction.fromObj(action);
   });
+  x.outputOrder = obj.outputOrder;
 
   return x;
 };
@@ -89,16 +92,7 @@ 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) {
diff --git a/lib/server.js b/lib/server.js
index 4481849..1b4e707 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -8,7 +8,8 @@ var inherits = require('inherits');
 var events = require('events');
 var nodeutil = require('util');
 
-var Bitcore = require('bitcore');
+var WalletUtils = require('bitcore-wallet-utils');
+var Bitcore = WalletUtils.Bitcore;
 var PublicKey = Bitcore.PublicKey;
 var HDPublicKey = Bitcore.HDPublicKey;
 var Address = Bitcore.Address;
@@ -17,7 +18,6 @@ var Explorers = require('bitcore-explorers');
 var ClientError = require('./clienterror');
 var Utils = require('./utils');
 var Storage = require('./storage');
-var WalletUtils = require('bitcore-wallet-utils');
 
 var Wallet = require('./model/wallet');
 var Copayer = require('./model/copayer');
diff --git a/package.json b/package.json
index a2c6aba..4638121 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "bitcore-wallet-service",
   "description": "A service for Mutisig HD Bitcoin Wallets",
   "author": "BitPay Inc",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "keywords": [
     "bitcoin",
     "copay",
@@ -19,8 +19,7 @@
   },
   "dependencies": {
     "async": "^0.9.0",
-    "bitcore": "^0.11.2",
-    "bitcore-wallet-utils": "0.0.3",
+    "bitcore-wallet-utils": "^0.0.4",
     "bitcore-explorers": "^0.9.1",
     "body-parser": "^1.11.0",
     "coveralls": "^2.11.2",
diff --git a/test/integration/server.js b/test/integration/server.js
index 6b49596..3a5ae14 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -11,10 +11,10 @@ var levelup = require('levelup');
 var memdown = require('memdown');
 var log = require('npmlog');
 log.debug = log.verbose;
-var Bitcore = require('bitcore');
 
 var Utils = require('../../lib/utils');
 var WalletUtils = require('bitcore-wallet-utils');
+var Bitcore = WalletUtils.Bitcore;
 var Storage = require('../../lib/storage');
 
 var Wallet = require('../../lib/model/wallet');
@@ -168,38 +168,7 @@ helpers.stubHistory = function(txs) {
   blockExplorer.getTransactions = sinon.stub().callsArgWith(1, null, txs);
 };
 
-helpers.clientSign = function(txp, xprivHex) {
-  //Derive proper key to sign, for each input
-  var privs = [],
-    derived = {};
-  var xpriv = new Bitcore.HDPrivateKey(xprivHex);
-
-  _.each(txp.inputs, function(i) {
-    if (!derived[i.path]) {
-      derived[i.path] = xpriv.derive(i.path).privateKey;
-      privs.push(derived[i.path]);
-    }
-  });
-
-  var t = new Bitcore.Transaction();
-
-  _.each(txp.inputs, function(i) {
-    t.from(i, i.publicKeys, txp.requiredSignatures);
-  });
-
-  t.to(txp.toAddress, txp.amount)
-    .change(txp.changeAddress.address);
-
-  var signatures = _.map(privs, function(priv, i) {
-    return t.getSignatures(priv);
-  });
-
-  signatures = _.map(_.sortBy(_.flatten(signatures), 'inputIndex'), function(s) {
-    return s.signature.toDER().toString('hex');
-  });
-
-  return signatures;
-};
+helpers.clientSign = WalletUtils.signTxp;
 
 helpers.createProposalOpts = function(toAddress, amount, message, signingKey) {
   var opts = {
@@ -1236,7 +1205,7 @@ describe('Copay server', function() {
         var tx = txs[0];
         tx.id.should.equal(txid);
 
-        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
         server.signTx({
           txProposalId: txid,
           signatures: signatures,
@@ -1263,7 +1232,7 @@ describe('Copay server', function() {
       server.getPendingTxs({}, function(err, txs) {
         var tx = txs[0];
         tx.id.should.equal(txid);
-        var signatures = helpers.clientSign(tx, TestData.copayers[1].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[1].xPrivKey);
         server.signTx({
           txProposalId: txid,
           signatures: signatures,
@@ -1279,7 +1248,7 @@ describe('Copay server', function() {
         var tx = txs[0];
         tx.id.should.equal(txid);
 
-        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
         signatures[0] = 1;
 
         server.signTx({
@@ -1314,7 +1283,7 @@ describe('Copay server', function() {
         var tx = txs[0];
         tx.id.should.equal(txid);
 
-        var signatures = _.take(helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H), 2);
+        var signatures = _.take(helpers.clientSign(tx, TestData.copayers[0].xPrivKey), 2);
         server.signTx({
           txProposalId: txid,
           signatures: signatures,
@@ -1331,7 +1300,7 @@ describe('Copay server', function() {
         var tx = txs[0];
         tx.id.should.equal(txid);
 
-        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
         server.signTx({
           txProposalId: txid,
           signatures: signatures,
@@ -1354,7 +1323,7 @@ describe('Copay server', function() {
         server.rejectTx({
           txProposalId: txid,
         }, function(err) {
-          var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+          var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
           server.signTx({
             txProposalId: txid,
             signatures: signatures,
@@ -1402,7 +1371,7 @@ describe('Copay server', function() {
               txProposalId: txid
             }, function(err, tx) {
               should.not.exist(err);
-              var signatures = helpers.clientSign(tx, TestData.copayers[2].xPrivKey_45H);
+              var signatures = helpers.clientSign(tx, TestData.copayers[2].xPrivKey);
               server.signTx({
                 txProposalId: txid,
                 signatures: signatures,
@@ -1429,7 +1398,7 @@ describe('Copay server', function() {
           server.createTx(txOpts, function(err, txp) {
             should.not.exist(err);
             should.exist(txp);
-            var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey_45H);
+            var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey);
             server.signTx({
               txProposalId: txp.id,
               signatures: signatures,
@@ -1571,7 +1540,7 @@ describe('Copay server', function() {
           });
         },
         function(txp, next) {
-          var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey_45H);
+          var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey);
           server.signTx({
             txProposalId: txpId,
             signatures: signatures,
@@ -1602,7 +1571,7 @@ describe('Copay server', function() {
         },
         function(txp, next) {
           helpers.getAuthServer(wallet.copayers[1].id, function(server, wallet) {
-            var signatures = helpers.clientSign(txp, TestData.copayers[1].xPrivKey_45H);
+            var signatures = helpers.clientSign(txp, TestData.copayers[1].xPrivKey);
             server.signTx({
               txProposalId: txpId,
               signatures: signatures,
@@ -1917,7 +1886,7 @@ describe('Copay server', function() {
       server.getPendingTxs({}, function(err, txs) {
         helpers.stubBroadcastFail();
         var tx = txs[0];
-        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
         server.signTx({
           txProposalId: tx.id,
           signatures: signatures,
@@ -1959,7 +1928,7 @@ describe('Copay server', function() {
     it('should notify sign, acceptance, and broadcast, and emit', function(done) {
       server.getPendingTxs({}, function(err, txs) {
         var tx = txs[2];
-        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+        var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
         sinon.spy(server, 'emit');
         server.signTx({
           txProposalId: tx.id,
@@ -2102,7 +2071,7 @@ describe('Copay server', function() {
     });
 
     it('should allow creator to remove an signed TX by himself', function(done) {
-      var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey_45H);
+      var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey);
       server.signTx({
         txProposalId: txp.id,
         signatures: signatures,
@@ -2124,7 +2093,7 @@ describe('Copay server', function() {
       async.waterfall([
 
         function(next) {
-          var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey_45H);
+          var signatures = helpers.clientSign(txp, TestData.copayers[0].xPrivKey);
           server.signTx({
             txProposalId: txp.id,
             signatures: signatures,
@@ -2188,7 +2157,7 @@ describe('Copay server', function() {
 
     it('should not allow creator copayer to remove an TX signed by other copayer', function(done) {
       helpers.getAuthServer(wallet.copayers[1].id, function(server2) {
-        var signatures = helpers.clientSign(txp, TestData.copayers[1].xPrivKey_45H);
+        var signatures = helpers.clientSign(txp, TestData.copayers[1].xPrivKey);
         server2.signTx({
           txProposalId: txp.id,
           signatures: signatures,
@@ -2325,7 +2294,7 @@ describe('Copay server', function() {
           should.not.exist(err);
           should.exist(tx);
 
-          var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey_45H);
+          var signatures = helpers.clientSign(tx, TestData.copayers[0].xPrivKey);
           server.signTx({
             txProposalId: tx.id,
             signatures: signatures,
diff --git a/test/models/txproposal.js b/test/models/txproposal.js
index 119ab88..9b864f3 100644
--- a/test/models/txproposal.js
+++ b/test/models/txproposal.js
@@ -5,7 +5,7 @@ var chai = require('chai');
 var sinon = require('sinon');
 var should = chai.should();
 var TXP = require('../../lib/model/txproposal');
-var Bitcore = require('bitcore');
+var Bitcore = require('bitcore-wallet-utils').Bitcore;
 
 
 describe('TXProposal', function() {
@@ -22,6 +22,17 @@ describe('TXProposal', function() {
       var t = txp.getBitcoreTx();
       should.exist(t);
     });
+    it('should order ouputs as specified by outputOrder', function() {
+      var txp = TXP.fromObj(aTXP());
+
+      txp.outputOrder = [0, 1];
+      var t = txp.getBitcoreTx();
+      t.getChangeOutput().should.deep.equal(t.outputs[1]);
+
+      txp.outputOrder = [1, 0];
+      var t = txp.getBitcoreTx();
+      t.getChangeOutput().should.deep.equal(t.outputs[0]);
+    });
   });
 
 
@@ -108,6 +119,7 @@ var aTXP = function() {
     "requiredSignatures": 2,
     "requiredRejections": 1,
     "status": "pending",
-    "actions": []
+    "actions": [],
+    "outputOrder": [0, 1],
   }
 };