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Who’s running the background here?
There isn’t one. Local, on-device zero knowledge proof in a cross-platform OSS app. You scan your ID’s NFC tag, once. Site only gets “is over 18 y/n” info. We all already have these IDs and they are used for a bunch of stuff, from doing taxes to creating bank accounts.
So when the site got “is under 18” yesterday and “is over 18” today, they now know your birthday. Cool.
No. As the other person said. The answers to the zkp do not refer to each other. All the site knows is SOME user was not 18 yesterday, and today SOME user is 18 (or 24… or 89…). No relation between the two zkps/certs.
Browser fingerprinting is a thing, though. The site already know who you are. This doesn’t really change anything.