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I don't see how it could be fully privacy preserving. It's the government trying to get the information, the repository is not secure! However, you could come

I don't see how it could be fully privacy preserving. It's the government trying to get the information, the repository is not secure! However, you could come close. Sell a simple USB device that generates codes. It can only be purchased in person by showing ID--but the ID is not recorded. Down the road it can only be traced to the device, not to the purchaser. But you would no doubt see them for sale by unscrupulous individuals reselling them.

AnthonyMouse 2y ago
Why does everyone want to make it complicated? You don't need hardware. You don't need cryptography. You show your ID and you get a password. The password is the same for everyone so it can't be correlated with anyone. Will people share the password? Of course, and they would also share the signatures or devices or whatever else, because you can't prevent that while also preserving privacy.