diff --git a/Gruntfile.js b/Gruntfile.js
index 01406f682..3dfa69460 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -14,7 +14,7 @@ module.exports = function(grunt) {
         command: 'rm -Rf bower_components node_modules'
       },
       osx: {
-        command: 'webkitbuilds/build-osx.sh'
+        command: 'webkitbuilds/build-osx.sh sign'
       }
     },
     watch: {
@@ -218,5 +218,6 @@ module.exports = function(grunt) {
   grunt.registerTask('translate', ['nggettext_extract']);
   grunt.registerTask('test', ['karma:unit']);
   grunt.registerTask('test-coveralls', ['karma:prod', 'coveralls']);
-  grunt.registerTask('desktop', ['prod', 'nodewebkit', 'copy:linux', 'compress:linux', 'exec:osx']);
+  grunt.registerTask('desktop', ['prod', 'nodewebkit', 'copy:linux', 'compress:linux']);
+  grunt.registerTask('osx', ['prod', 'nodewebkit', 'exec:osx']);
 };
diff --git a/webkitbuilds/build-osx.sh b/webkitbuilds/build-osx.sh
index 749c763a2..5563f90eb 100755
--- a/webkitbuilds/build-osx.sh
+++ b/webkitbuilds/build-osx.sh
@@ -1,5 +1,11 @@
 #!/bin/bash
 
+SHOULD_SIGN=$1
+if [ "$SHOULD_SIGN" ] 
+then
+  echo "Will sign the APP"
+fi
+
 # by Andy Maloney
 # http://asmaloney.com/2013/07/howto/packaging-a-mac-os-x-application-using-a-dmg/
 
@@ -55,6 +61,26 @@ SIZE=150
 if [ $? -ne 0 ]; then
    echo "Error: Cannot compute size of staging dir"
    exit
+ fi
+
+# Sign Code (MATIAS)
+if [ $SHOULD_SIGN ]
+then
+  echo "Signing Copay DMG"
+
+  export IDENTITY="3rd Party Mac Developer Application: BitPay, Inc. (884JRH5R93)"
+
+  # not need for 'out of app store' distribution (?)  
+#  export PARENT_PLIST=parent.plist
+#  export CHILD_PLIST=child.plist
+  export APP_PATH=${STAGING_DIR}/${APP_NAME}.app
+
+  codesign --deep -s "${IDENTITY}"  $APP_PATH"/Contents/Frameworks/nwjs Helper.app" && echo "Sign 1"
+  codesign --deep -s "${IDENTITY}"  $APP_PATH"/Contents/Frameworks/nwjs Helper EH.app" && echo "Sign 2"
+  codesign --deep -s "${IDENTITY}"  $APP_PATH"/Contents/Frameworks/nwjs Helper NP.app" && echo "Sign 3"
+  codesign --deep -s "${IDENTITY}"  $APP_PATH && echo "Sign 4"
+  echo "Signing Done"
+
 fi
 
 # create the temp DMG file