diff --git a/js/models/core/Wallet.js b/js/models/core/Wallet.js
index 1ae29657e..395f952d3 100644
--- a/js/models/core/Wallet.js
+++ b/js/models/core/Wallet.js
@@ -4,6 +4,7 @@ var EventEmitter = require('events').EventEmitter;
 var async = require('async');
 var preconditions = require('preconditions').singleton();
 var util = require('util');
+var microtime = require('microtime');
 
 var bitcore = require('bitcore');
 var bignum = bitcore.Bignum;
@@ -315,6 +316,11 @@ Wallet.prototype._onAddressBook = function(senderId, data, isInbound) {
   }
 };
 
+
+Wallet.prototype.updateTimestamp = function() {
+  this.lastTimestamp = microtime.now();
+};
+
 Wallet.prototype._onData = function(senderId, data, isInbound) {
   preconditions.checkArgument(senderId);
   preconditions.checkArgument(data);
@@ -326,6 +332,8 @@ Wallet.prototype._onData = function(senderId, data, isInbound) {
     return;
   }
 
+  this.updateTimestamp();
+
   switch (data.type) {
     // This handler is repeaded on WalletFactory (#join). TODO
     case 'walletId':
@@ -438,7 +446,8 @@ Wallet.prototype.netStart = function(callback) {
   var startOpts = {
     copayerId: myId,
     privkey: myIdPriv,
-    maxPeers: self.totalCopayers
+    maxPeers: self.totalCopayers,
+    lastTimestamp: this.lastTimestamp,
   };
 
   if (this.publicKeyRing.isComplete()) {
diff --git a/js/models/network/Async.js b/js/models/network/Async.js
index 6e1835bbe..195773b27 100644
--- a/js/models/network/Async.js
+++ b/js/models/network/Async.js
@@ -326,7 +326,7 @@ Network.prototype.start = function(opts, openCallback) {
   this._setupConnectionHandlers(openCallback);
   var pubkey = this.getKey().public.toString('hex');
   this.socket.emit('subscribe', pubkey);
-  //this.socket.emit('sync');
+  this.socket.emit('sync', opts.lastTimestamp);
   this.started = true;
 
 };
diff --git a/package.json b/package.json
index d68f10f9f..fe84e9ba1 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   },
   "version": "0.4.7",
   "dependencies": {
+    "microtime": "^1.0.1",
     "mocha": "^1.18.2",
     "mocha-lcov-reporter": "0.0.1",
     "optimist": "^0.6.1",