this post was submitted on 29 Aug 2025
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Sorry, not sufficient.
Not secure.
" I certify that somebody is >18, but I don't say who - just somebody "
This is an open invitation to fraud. You are going to create at least a black market for these certificates, since they are anonymous but valid.
And I'm sure some real fraudsters have even stronger ideas than I have.
Making the certs short-lived (a few minutes) and single use and having a rate limit for users could make it difficult enough with serious risks (if you make it a crime) for little profit (I doubt many kids will pay serious amounts of money to watch porn; definetly not drug-scale amounts of money).
You cannot make a certificate "single use" (except if it exists only inside a closed system).
The website generates a random value, your government signs a cert for that value. That's what makes it single use and zero trust.