>Proof of identity in theory can solve the problem but at the cost of privacy.
All current implementations: yes. I do think there are some privacy preserving solutions, but they're obviously imperfect. But assuming you have a central authority that can validate and sign valid government identification, it seems like some sort of ZK scheme could allow one to verify that they have a valid government issued ID, but without disclosing which one it is.
I still don't love the idea, but it sure seems better than everything else I've seen proposed.
All current implementations: yes. I do think there are some privacy preserving solutions, but they're obviously imperfect. But assuming you have a central authority that can validate and sign valid government identification, it seems like some sort of ZK scheme could allow one to verify that they have a valid government issued ID, but without disclosing which one it is.
I still don't love the idea, but it sure seems better than everything else I've seen proposed.