diff --git a/lib/model/txproposal.js b/lib/model/txproposal.js
index 292f7c6..fbb41f3 100644
--- a/lib/model/txproposal.js
+++ b/lib/model/txproposal.js
@@ -69,6 +69,15 @@ TxProposal.prototype._updateStatus = function() {
 };
 
 
+TxProposal.prototype._getCurrentSignatures = function() {
+  return _.map(_.some(this.actions, 'xpub'), function(x) {
+    return {
+      signatures: x.signatures,
+      xpub: xpub,
+    };
+  });
+};
+
 TxProposal.prototype._getBitcoreTx = function() {
   var self = this;
 
@@ -81,6 +90,13 @@ TxProposal.prototype._getBitcoreTx = function() {
     .change(this.changeAddress);
 
   t._updateChangeOutput();
+
+
+  var sigs = this._getCurrentSignatures();
+  _.each(sigs, function(x) {
+    this._addSignaturesToBitcoreTx(t, x.signatures, x.xpub);
+  });
+
   return t;
 };
 
@@ -121,22 +137,20 @@ TxProposal.prototype.getActionBy = function(copayerId) {
   };
 };
 
-TxProposal.prototype.addAction = function(copayerId, type, signatures) {
+TxProposal.prototype.addAction = function(copayerId, type, signatures, xpub) {
   var action = new TxProposalAction({
     copayerId: copayerId,
     type: type,
     signatures: signatures,
+    xpub: xpub,
   });
   this.actions[copayerId] = action;
   this._updateStatus();
 };
 
-// TODO: no sure we should receive xpub or a list of pubkeys (pre derived)
-TxProposal.prototype.checkSignatures = function(signatures, xpub) {
+TxProposal.prototype._addSignaturesToBitcoreTx = function(t, signatures, xpub) {
   var self = this;
 
-  var t = this._getBitcoreTx();
-
   if (signatures.length != this.inputs.length)
     return false;
 
@@ -159,17 +173,25 @@ TxProposal.prototype.checkSignatures = function(signatures, xpub) {
 
       t.applySignature(s);
       oks++;
-    } catch (e) {
-      // TODO only for debug now
-      console.log('DEBUG ONLY:', e.message); //TODO
-    };
+    } catch (e) {};
   });
-  return oks === t.inputs.length;
+
+  if (oks != t.inputs.length)
+    throw new Error('wrong signatures');
 };
 
 
-TxProposal.prototype.sign = function(copayerId, signatures) {
-  this.addAction(copayerId, 'accept', signatures);
+TxProposal.prototype.sign = function(copayerId, signatures, xpub) {
+
+  // Tests signatures are OK
+  var t = this._getBitcoreTx();
+  try {
+    this._addSignaturesToBitcoreTx(t, signatures, xpub);
+    this.addAction(copayerId, 'accept', signatures, xpub);
+    return true;
+  } catch (e) {
+    return false;
+  }
 };
 
 TxProposal.prototype.reject = function(copayerId) {
diff --git a/lib/model/txproposalaction.js b/lib/model/txproposalaction.js
index 8e0f3af..13fa98b 100644
--- a/lib/model/txproposalaction.js
+++ b/lib/model/txproposalaction.js
@@ -7,6 +7,7 @@ function TxProposalAction(opts) {
   this.copayerId = opts.copayerId;
   this.type = opts.type || (opts.signatures ? 'accept' : 'reject');
   this.signatures = opts.signatures;
+  this.xpub = opts.xpub;
 };
 
 TxProposalAction.fromObj = function (obj) {
@@ -16,6 +17,7 @@ TxProposalAction.fromObj = function (obj) {
   x.copayerId = obj.copayerId;
   x.type = obj.type;
   x.signatures = obj.signatures;
+  x.xpub = obj.xpub;
 
   return x;
 };
diff --git a/lib/server.js b/lib/server.js
index 7aff2fc..d186758 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -585,9 +585,7 @@ CopayServer.prototype.removePendingTx = function(opts, cb) {
 CopayServer.prototype._broadcastTx = function(txp, cb) {
   var raw = txp.getRawTx();
   var bc = this._getBlockExplorer('insight', txp.getNetworkName());
-console.log('[server.js.588:raw:]',raw); //TODO
   bc.broadcast(raw, function(err, txid) {
-console.log('[server.js.589:err:]',err, txid); //TODO
     return cb(err, txid);
   })
 };
@@ -622,11 +620,9 @@ CopayServer.prototype.signTx = function(opts, cb) {
 
       var copayer = wallet.getCopayer(self.copayerId);
 
-      if (!txp.checkSignatures(opts.signatures, copayer.xPubKey))
+      if (!txp.sign(self.copayerId, opts.signatures, copayer.xPubKey))
         return cb(new ClientError('BADSIGNATURES', 'Bad signatures'));
 
-      txp.sign(self.copayerId, opts.signatures);
-
       self.storage.storeTx(self.walletId, txp, function(err) {
         if (err) return cb(err);
 
diff --git a/test/integration.js b/test/integration.js
index b4685f4..e80218c 100644
--- a/test/integration.js
+++ b/test/integration.js
@@ -114,7 +114,14 @@ helpers.createUtxos = function(server, wallet, amounts, cb) {
 };
 
 
-helpers.stubBlockExplorer = function(server, utxos, txid) {
+helpers.stubBlockExplorer = function(server, inUtxos, txid) {
+
+  var utxos = _.map(inUtxos, function(x) {
+    x.toObject = function() {
+      return this;
+    };
+    return x;
+  });
 
   var bc = sinon.stub();
   bc.getUnspentUtxos = sinon.stub().callsArgWith(1, null, utxos);
diff --git a/test/txproposal.js b/test/txproposal.js
index a3709bf..131862e 100644
--- a/test/txproposal.js
+++ b/test/txproposal.js
@@ -28,10 +28,10 @@ describe('TXProposal', function() {
   describe('#sign', function() {
     it('should sign 2-2', function() {
       var txp = TXP.fromObj(aTXP());
-      txp.sign('1', theSignatures);
+      txp.sign('1', theSignatures, theXPub);
       txp.isAccepted().should.equal(false);
       txp.isRejected().should.equal(false);
-      txp.sign('2', theSignatures);
+      txp.sign('2', theSignatures, theXPub);
       txp.isAccepted().should.equal(true);
       txp.isRejected().should.equal(false);
     });
@@ -59,26 +59,10 @@ describe('TXProposal', function() {
     });
   });
 
-
-  describe('#checkSignatures', function() {
-    it('should check signatures', function() {
-      var txp = TXP.fromObj(aTXP());
-      var xpriv = new Bitcore.HDPrivateKey(theXPriv);
-      var priv = xpriv.derive(txp.inputPaths[0]).privateKey;
-
-      var t = txp._getBitcoreTx();
-      t.sign(priv);
-
-      var s = t.getSignatures(priv)[0].signature.toDER().toString('hex');
-      var xpub = new Bitcore.HDPublicKey(xpriv);
-
-      var res = txp.checkSignatures([s], xpub);
-      res.should.equal(true);
-    });
-  });
 });
 
 var theXPriv = 'xprv9s21ZrQH143K2rMHbXTJmWTuFx6ssqn1vyRoZqPkCXYchBSkp5ey8kMJe84sxfXq5uChWH4gk94rWbXZt2opN9kg4ufKGvUM7HQSLjnoh7e';
+var theXPub = 'xpub661MyMwAqRbcFLRkhYzK8eQdoywNHJVsJCMQNDoMks5bZymuMcyDgYfnVQYq2Q9npnVmdTAthYGc3N3uxm5sEdnTpSqBc4YYTAhNnoSxCm9';
 var theSignatures = ['3045022100896aeb8db75fec22fddb5facf791927a996eb3aee23ee6deaa15471ea46047de02204c0c33f42a9d3ff93d62738712a8c8a5ecd21b45393fdd144e7b01b5a186f1f9'];
 
 var aTXP = function() {