Hi guys unpix.in owner here. To avoid scammers like this I've added "verified posters" feature. When you're about to tip someone you can see a "Posted By:" under title of the post, and if he/she is verified user you'll see a yellow box says that 'verified user' that means he/she is proved his/her identity to admins, here you can see an example: http://i.imgur.com/xpJH6S2.png