diff --git a/www/common/pinpad.js b/www/common/pinpad.js
new file mode 100644
index 000000000..b3285b8f8
--- /dev/null
+++ b/www/common/pinpad.js
@@ -0,0 +1,57 @@
+define([
+    '/common/cryptpad-common.js',
+    '/common/rpc.js',
+
+    '/bower_components/tweetnacl/nacl-fast.min.js'
+], function (Cryptpad, Rpc) {
+
+    var Nacl = window.nacl;
+
+    var deduplicate = function (array) {
+        var a = array.slice();
+        for(var i=0; i<a.length; i++) {
+            for(var j=i+1; j<a.length; j++) {
+                if(a[i] === a[j]) { a.splice(j--, 1); }
+            }
+        }
+        return a;
+    };
+
+    var create = function (network, ed) {
+        var exp = {};
+        var rpc = Rpc.create(network, ed);
+
+        var checkHash = exp.checkHash = function (fileList) {
+            //var fileList = fo.getFilesDataFiles();
+            var channelIdList = [];
+            fileList.forEach(function (href) {
+                var parsedHref = Cryptpad.parsePadUrl(href);
+                if (!parsedHref || !parsedHref.hash) { return; }
+                var parsedHash = Cryptpad.parseHash(parsedHref.hash);
+                if (!parsedHash || !parsedHash.channel) { return; }
+                channelIdList.push(Cryptpad.base64ToHex(parsedHash.channel));
+            });
+            var uniqueList = deduplicate(channelIdList).sort();
+
+            /*
+1. every time you want to pin or unpid a pad you send a message to the server
+2. the server sends back a hash of the sorted list of your pinned pads
+3. you hash your sorted list of pinned pads that you should have according to your drive
+4. compare them, if same
+    AWESOME
+  if they are not
+    UNPIN all, send all
+
+            */
+
+            var hash = Nacl.util.encodeBase64(Nacl.hash(Nacl.util.decodeUTF8( JSON.stringify(uniqueList) )));
+
+            console.log(hash);
+            return hash;
+        };
+
+        return exp;
+    };
+
+    return { create: create };
+});