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).
I was using the wording of OP who seems to be talking about tokens. The service asks the trusted entity if the token is valid, the trusted entity deletes the token after the first time.