diff --git a/js/controllers/send.js b/js/controllers/send.js
index 07bbfbb53..5a78389cc 100644
--- a/js/controllers/send.js
+++ b/js/controllers/send.js
@@ -52,8 +52,7 @@ angular.module('copay.send').controller('SendController',
       var amount = (form.amount.$modelValue * 100000000).toString(); // satoshi to string
 
       var w = $rootScope.wallet;
-      w.createTx( address, amount,function() {
-
+      w.createTx(address, amount,function() {
         $scope.loading = false;
         $rootScope.$flashMessage = { message: 'The transaction proposal has been created', type: 'success'};
         $rootScope.$digest();
diff --git a/js/models/core/Wallet.js b/js/models/core/Wallet.js
index 58008ae79..42c754037 100644
--- a/js/models/core/Wallet.js
+++ b/js/models/core/Wallet.js
@@ -20,7 +20,8 @@ function Wallet(opts) {
     'requiredCopayers', 'totalCopayers', 'spendUnconfirmed',
     'publicKeyRing', 'txProposals', 'privateKey', 'version'
   ].forEach(function(k) {
-    if (typeof opts[k] === 'undefined') throw new Error('missing key:' + k);
+    if (typeof opts[k] === 'undefined')
+      throw new Error('missing required option for Wallet: ' + k);
     self[k] = opts[k];
   });
 
@@ -544,6 +545,8 @@ Wallet.prototype.getUnspent = function(cb) {
 
 Wallet.prototype.createTx = function(toAddress, amountSatStr, opts, cb) {
   var self = this;
+  alert(amountSatStr);
+  alert(JSON.stringify(opts));
   if (typeof opts === 'function') {
     cb = opts;
     opts = {};
diff --git a/js/models/core/WalletFactory.js b/js/models/core/WalletFactory.js
index fc7f0ee77..602d8c3a2 100644
--- a/js/models/core/WalletFactory.js
+++ b/js/models/core/WalletFactory.js
@@ -17,6 +17,8 @@ var Wallet = require('./Wallet');
 
 function WalletFactory(config, version) {
   var self = this;
+  config = config || {};
+
   this.storage = new Storage(config.storage);
   this.network = new Network(config.network);
   this.blockchain = new Blockchain(config.blockchain);
@@ -97,7 +99,6 @@ WalletFactory.prototype.create = function(opts) {
 
   opts.privateKey = opts.privateKey ||  new PrivateKey({ networkName: this.networkName });
 
-
   var requiredCopayers = opts.requiredCopayers || this.walletDefaults.requiredCopayers;
   var totalCopayers =  opts.totalCopayers || this.walletDefaults.totalCopayers;
 
@@ -124,7 +125,7 @@ WalletFactory.prototype.create = function(opts) {
   opts.spendUnconfirmed = opts.spendUnconfirmed || this.walletDefaults.spendUnconfirmed;
   opts.requiredCopayers = requiredCopayers;
   opts.totalCopayers = totalCopayers;
-  opts.version       = this.version;
+  opts.version       = opts.version || this.version;
   var w = new Wallet(opts);
   w.store();
   return w;
diff --git a/test/find_m_n.js b/test/find_m_n.js
new file mode 100755
index 000000000..678a3d5dd
--- /dev/null
+++ b/test/find_m_n.js
@@ -0,0 +1,65 @@
+#!/usr/bin/env node
+
+'use strict';
+
+var bitcore = require('bitcore');
+var PublicKeyRing = require('../js/models/core/PublicKeyRing');
+var PrivateKey = require('../js/models/core/PrivateKey');
+
+var FakeNetwork = require('./mocks/FakeNetwork');
+var Insight = require('../js/models/blockchain/Insight');
+var FakeStorage = require('./mocks/FakeStorage');
+
+var WalletFactory = require('soop').load('../js/models/core/WalletFactory', {
+  Network: FakeNetwork,
+  Blockchain: Insight,
+  Storage: FakeStorage,
+});
+var Key = bitcore.Key;
+
+
+var N_LIMIT = 16;
+var nn = 'livenet';
+
+for (var n = 1; n < N_LIMIT; n++) {
+  for (var m = 1; m <= n; m++) {
+    // case m-of-n
+    console.log('case '+m+'-of-'+n);
+    // create full pkr
+    var publicKeyRing = new PublicKeyRing({
+      networkName: nn,
+      requiredCopayers: m,
+      totalCopayers: n,
+    });
+    var privateKey = null;
+    for (var i = 0; i < n; i++) {
+      var pk = new PrivateKey({
+        networkName: nn
+      });
+      if (i === 0) {
+        privateKey = pk;
+      } else {
+        publicKeyRing.addCopayer(pk.getExtendedPublicKeyString(), 'dummy');
+      }
+    }
+
+    var opts = {};
+    opts.publicKeyRing = publicKeyRing;
+    opts.privateKey = privateKey;
+    opts.requiredCopayers = m;
+    opts.totalCopayers = n;
+    opts.spendUnconfirmed = true;
+    opts.version = 'script'
+
+    var w = new WalletFactory(opts).create(opts);
+    var addr = w.generateAddress();
+    console.log('\t receive addr='+addr);
+
+
+    var toAddress = 'msj42CCGruhRsFrGATiUuh25dtxYtnpbTx';
+    var amount = '5000000';
+
+
+
+  }
+}