Just because you can't do it doesn't automatically mean that it can't be done in general, you idiot.
Actually, all you need to prove the ownership of a public key is to sign a message with the matching private key. Such signature check can be implemented in bitcoin, in litecoin, in any other coin and even in your toaster you pongid. If you don't know what you're talking about, then just shut the fuck up. You keep making a fool of yourself, and the world is watching amused. I have seen many trolls here, but you for sure are the stupidest.