Xkno Proving Grounds is a Rap Battle App that revolutionizes what the Rap Game is. With a digital meeting place people can meet up, users can get together with other users and have fun Conducting, or joining in on Rap Battles. If you want to know who really is the Rap King/Queen, then you have found the right app. But if you are looking to prove yourself and your skills, or just get better at lyrical flows, here is also the place you have been looking. Xkno Proving Grounds. Where you will get paid to rap.