Wouldn't there be some people that would check who their opponent is using IPs?

I think this is an interesting idea. After all, I'm sure more than one of us plays better when they aren't nervous. Playing against annonymous opponents, while it could be anxiety-producing for some, would make some (including me) less nervous about battling. Obviously, this would make me a lot better in duels. I've signed up, and I anxiously await the first rounds. However, I have one question:

Who will host the duels?