This link http://defflogic.com/random/ provides a random 10 digit code to use for mechanical Turk survey codes to prove someone filled out your survey. Please enjoy and share with others. If you have no idea what I am talking about read this.
Make the last question of your Survey Monkey Survey similar to the one below
Please click the link below and you will receive a unique code. Please copy and paste the unique code into the box below and use it as your survey code as well.