How would you prove that you were the owner of a name and address without revealing additional information about yourself? Theoretically, there could be a syst

How would you prove that you were the owner of a name and address without revealing additional information about yourself? Theoretically, there could be a system where, if the publisher of a name+address gets an anonymous request to remove that information, then they have to mail a letter with a nonce to that address, and then if they get a followup request with that nonce, then they have to comply and remove it. In practice, a system involving third-parties such as a lawyer or government agency is more likely, I'm just proving my point that there's nothing fundamental that requires compromising anonymity. It's also worth noting that if a client is known to their lawyer but unknown to anyone else, it's pretty widely accepted to describe that client as anonymous, even if they're not technically anonymous in the ultimate, purist sense. If a website operator is anonymous, how are you going to contact them and require them to take down your information? [What] if they refuse?" First of all, that's not a conflict or tradeoff between my ability to anonymously use services and my control over my data. And the obvious solution, which is the one we have, is that to run a website, someone has to give up a little anonymity and be subject to laws. But there's no fundamental reason people can't anonymously use services and maintain control over their data.