diff --git a/src/app.js b/src/app.js
index 2d21c78305..44e2786a39 100644
--- a/src/app.js
+++ b/src/app.js
@@ -659,11 +659,11 @@ var run = function () {
 
   udapp.event.register('publishContract', this, function (contract) {
     console.log('Publish contract...', contract)
-    swarmgw.put(contract.metadata, function (err, ret) {
+    swarmVerifiedPublish(contract.metadata, contract.metadataHash, function (err) {
       if (err) {
         alert('Failed to publish metadata: ' + err)
       } else {
-        alert('Published metadata: ' + ret)
+        alert('Published metadata')
       }
     })
   })
diff --git a/src/app/renderer.js b/src/app/renderer.js
index 70a181c6f2..24d948731b 100644
--- a/src/app/renderer.js
+++ b/src/app/renderer.js
@@ -72,6 +72,13 @@ Renderer.prototype.error = function (message, container, options) {
 }
 
 Renderer.prototype.contracts = function (data, source) {
+  var retrieveMetadataHash = function (bytecode) {
+    var match = /a165627a7a72305820([0-9a-f]{64})0029$/.exec(bytecode)
+    if (match) {
+      return match[1]
+    }
+  }
+
   var udappContracts = []
   for (var contractName in data.contracts) {
     var contract = data.contracts[contractName]
@@ -79,17 +86,11 @@ Renderer.prototype.contracts = function (data, source) {
       name: contractName,
       interface: contract['interface'],
       bytecode: contract.bytecode,
-      metadata: contract.metadata
+      metadata: contract.metadata,
+      metadataHash: contract.bytecode && retrieveMetadataHash(contract.bytecode)
     })
   }
 
-  var retrieveMetadataHash = function (bytecode) {
-    var match = /a165627a7a72305820([0-9a-f]{64})0029$/.exec(bytecode)
-    if (match) {
-      return match[1]
-    }
-  }
-
   var tableRowItems = function (first, second, cls) {
     return $('<div class="crow"/>')
       .addClass(cls)