It is technically impossible.

People are already selling Worldcoin and other ID verifications for bot accounts for pretty cheap online (seems to be mostly targeted towards chinese users that want access to Claude).

Anonymous Credentials comes up frequently in this discussion. Doesn't solve the origination, but makes passing credentials through proxies and providers better.

https://hn.algolia.com/?q=anonymous+credentials

i think its the other way around, we need a way to stop construction of AI that can be mistaken for human, and a revision of the online environment that allows AI to conceal its identity.

there is no functional reason for AI to structure its output to be indistinguishable from human interaction.