diff --git a/controllers/prototype/dbrequests.js b/controllers/prototype/dbrequests.js
index 6333294..e4f2671 100644
--- a/controllers/prototype/dbrequests.js
+++ b/controllers/prototype/dbrequests.js
@@ -1270,7 +1270,13 @@ DBReq.UserVerifier.prototype.execute = function() {
                 },
                 function(err, result) {
                     var ok = result.reduce(function(prev, next) { return prev && next; });
-                    self.finish(ok);
+                    self.client.query(
+                        "UPDATE Users SET valid = $1 WHERE id = $2",
+                        [ok, self.userId],
+                        function(err, result) {
+                            self.finish(ok);
+                        }
+                    );
                 }
             );
         }
@@ -1286,7 +1292,40 @@ DBReq.UserVerifier.prototype.finish = function(finalResult) {
     this.finishAction(finalResult);
 };
 
+DBReq.UserGetter = function(userId, finishAction) {
+    this.userId = userId;
+    this.finishAction = finishAction;
 
+    var self = this;
+    pg.connect(pgc.url, function(err, client, release) {
+        self.client = client;
+        self.release = release;
+
+        self.execute();
+    });
+};
+
+DBReq.UserGetter.prototype.execute = function() {
+    var self = this;
+
+    this.client.query(
+        'SELECT worker_id AS "workerId", valid FROM Users WHERE id = $1',
+        [self.userId],
+        function(err, result) {
+            self.finish(result.rows[0].workerId, result.rows[0].valid);
+        }
+    );
+};
+
+DBReq.UserGetter.prototype.finish = function(workerId, valid) {
+
+    this.release();
+    this.release = null;
+    this.client = null;
+
+    this.finishAction(workerId, valid);
+
+};
 
 /**
  * Try to get a user by id, and creates it if it doesn't exists
@@ -1386,4 +1425,8 @@ DBReq.verifyUser = function(id, callback) {
     new DBReq.UserVerifier(id, callback);
 };
 
+DBReq.getUser = function(id, callback) {
+    new DBReq.UserGetter(id, callback);
+}
+
 module.exports = DBReq;
diff --git a/controllers/thankyou/index.js b/controllers/thankyou/index.js
index fb4accc..d17582d 100644
--- a/controllers/thankyou/index.js
+++ b/controllers/thankyou/index.js
@@ -3,24 +3,23 @@ var vcode = require('../../lib/vcode.js');
 
 module.exports.index = function(req, res) {
 
-    db.verifyUser(req.session.userId, function(ok) {
+    // If not micro-worker
+    if (req.session.workerId === undefined) {
 
-        if (ok) {
+        res.setHead('Content-Type', 'text/html');
 
-            res.locals.vcode = vcode(req.session.workerId, req.session.campaignIp);
-
-        }
-
-        res.locals.workerId = req.session.workerId;
-        req.session = null;
-        res.locals.session = null;
-
-        res.setHeader('Content-Type', 'text/html');
-
-        res.render('index.jade', res.locals, function(err, result) {
+        res.render('normal.jade', res.locals, function(err, result) {
             res.send(result);
         });
 
+        return;
+    }
+
+    res.setHeader('Content-Type', 'text/html');
+
+    res.render('vcode.jade', res.locals, function(err, result) {
+        console.log(err);
+        res.send(result);
     });
 
 };
diff --git a/controllers/thankyou/views/index.jade b/controllers/thankyou/views/normal.jade
similarity index 58%
rename from controllers/thankyou/views/index.jade
rename to controllers/thankyou/views/normal.jade
index 53a86d8..821cda0 100644
--- a/controllers/thankyou/views/index.jade
+++ b/controllers/thankyou/views/normal.jade
@@ -6,8 +6,3 @@ block content
         source(src="/static/data/music/thankyou.ogg")
         source(src="/static/data/music/thankyou.mp3")
 
-    if (vcode !== undefined)
-        p Your vcode is #{vcode}.
-    else if (workerId !== undefined)
-        p You have no vcode because you're bad
-
diff --git a/controllers/thankyou/views/vcode.jade b/controllers/thankyou/views/vcode.jade
new file mode 100644
index 0000000..73a826b
--- /dev/null
+++ b/controllers/thankyou/views/vcode.jade
@@ -0,0 +1,36 @@
+extends ../../../views/base.jade
+
+block content
+    h1 Thank you for everything !
+    audio(autoplay)
+        source(src="/static/data/music/thankyou.ogg")
+        source(src="/static/data/music/thankyou.mp3")
+
+    p We are verifying that the experiment was correctly done...
+        #vcode
+
+    script.
+        function tryVcode() {
+            var xhr = new XMLHttpRequest();
+            xhr.open('GET', '/vcode', true);
+            xhr.onreadystatechange = function (aEvt) {
+                if (xhr.readyState == 4) {
+                    if(xhr.status == 200) {
+                        changeHtml(xhr.responseText);
+                    }
+                }
+            };
+            xhr.send(null);
+        }
+
+        function changeHtml(vcode) {
+            if (vcode === 'not ready') {
+                setTimeout(tryVcode, 1000);
+            } else if (vcode === 'no vcode') {
+                $('#vcode').html('Sorry, the experiment has not been correctly done ! You have no vcode.');
+            } else {
+                $('#vcode').html('Your vcode is ' + vcode);
+            }
+        }
+
+        tryVcode();
diff --git a/controllers/vcode/index.js b/controllers/vcode/index.js
new file mode 100644
index 0000000..3ac1ca5
--- /dev/null
+++ b/controllers/vcode/index.js
@@ -0,0 +1,39 @@
+var db = require('../prototype/dbrequests.js');
+var vcode = require('../../lib/vcode.js');
+
+module.exports.index = function(req, res) {
+
+    // If not micro-worker
+    if (req.session.workerId === undefined) {
+
+        res.setHeader('Content-Type', 'text/html');
+
+        res.send(null);
+
+        return;
+    }
+
+    // Else, check that exp was correctly done
+    db.getUser(req.session.userId, function(workerId, ok) {
+
+        res.setHeader('Content-Type', 'text/html');
+
+        if (ok === true) {
+
+            var code = vcode(req.session.workerId);
+            res.send(code);
+
+        } else if (ok === false) {
+
+            res.send('no vcode');
+
+        } else {
+
+            res.send('not ready');
+
+        }
+
+    });
+
+};
+
diff --git a/controllers/vcode/urls.js b/controllers/vcode/urls.js
new file mode 100644
index 0000000..42d5339
--- /dev/null
+++ b/controllers/vcode/urls.js
@@ -0,0 +1,3 @@
+module.exports = {
+    '/vcode': 'index',
+};
diff --git a/posts/feedback-target/index.js b/posts/feedback-target/index.js
index 53a573d..8af8894 100644
--- a/posts/feedback-target/index.js
+++ b/posts/feedback-target/index.js
@@ -1,16 +1,20 @@
 var pg = require('pg');
 var pgc = require('../../private.js');
+var db = require('../../controllers/prototype/dbrequests.js');
 var mail = require('../../lib/mail.js');
 var Log = require('../../lib/NodeLog.js');
 
 module.exports.index = function(req, res) {
 
+    db.verifyUser(req.session.userId, function() {});
+
     var text = '';
 
     for (var i in req.body) {
         text += i + ' : ' + req.body[i] + '\n';
     }
 
+
     pg.connect(pgc.url, function(err, client, release) {
 
         client.query(
diff --git a/sql/backup.pgsql b/sql/backup.pgsql
index bb572eb..17508a1 100644
--- a/sql/backup.pgsql
+++ b/sql/backup.pgsql
@@ -42,7 +42,8 @@ CREATE TABLE Users(
     age VARCHAR(10),
     rating INT,
     lasttime INT,
-    male BOOLEAN
+    male BOOLEAN,
+    valid BOOLEAN DEFAULT NULL
 );
 
 CREATE TABLE Scene(