diff --git a/isso/js/app/isso.js b/isso/js/app/isso.js
index b5236d8..ee57624 100644
--- a/isso/js/app/isso.js
+++ b/isso/js/app/isso.js
@@ -7,6 +7,20 @@ define(["app/dom", "app/utils", "app/config", "app/api", "app/jade", "app/i18n",
 
     var Postbox = function(parent) {
 
+        if (config['auth'] === true) {
+            var authCookie = utils.cookie('auth');
+            if (! authCookie) {
+                jade.set("cookie", {'valid': false});
+            } else {
+                var authData = lib.itsdangerous(authCookie)
+                if (! authData) {
+                    jade.set("cookie", {'valid': false});
+                } else {
+                    jade.set("cookie", {'valid': true, 'data': authData});
+                }
+            }
+        }
+
         var el = $.htmlify(jade.render("postbox"));
 
         // callback on success (e.g. to toggle the reply button)
diff --git a/isso/js/app/text/postbox.jade b/isso/js/app/text/postbox.jade
index 5e65df3..00d09f5 100644
--- a/isso/js/app/text/postbox.jade
+++ b/isso/js/app/text/postbox.jade
@@ -16,7 +16,7 @@ mixin form(style)
 div(class='isso-postbox')
     if conf.auth
         if cookie.valid
-            p=i18n('postbox-auth-commenting-as') + ' ' + cookie.username
+            p=i18n('postbox-auth-commenting-as') + ' ' + cookie.data.username
             +form('visibility: hidden;')
         else
             p=i18n('postbox-auth-required')
diff --git a/isso/js/embed.js b/isso/js/embed.js
index 8134315..680880b 100644
--- a/isso/js/embed.js
+++ b/isso/js/embed.js
@@ -11,7 +11,6 @@ require(["app/lib/ready", "app/config", "app/i18n", "app/api", "app/isso", "app/
     jade.set("i18n", i18n.translate);
     jade.set("pluralize", i18n.pluralize);
     jade.set("svg", svg);
-    jade.set("cookie", {'valid': true, 'username': 'Nicolas'})
 
     domready(function() {