I'd like a govt service where you can verify that you're a real person but not your identity or anything of the sort. Sort of like having the third party registering with the government and then you get a token per account you make so the service can verify there isn't more than one accounts per person but they can't identify you across the services. Would also be immensely helpful useful for stopping cheating in online video games, while not requiring you to give our your real name and identity to anything