I'm running a WordPress site that has giveaways. It randomly picks from the WordPress users that have entered and it rewards them. However, I'm trying to figure out how to make it so that I can access my user's computer GUIDs so that I can ban people who have multiple accounts.
The trouble with IP banning is that people use proxies to bypass the security system.
So, is there any plugin or custom code that allows me to do this?