this post was submitted on 26 Jun 2025
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Depends entirely on how it's implemented, because the website doesn't need to know who you are, only verify that you are over 18. Which can be done reasonably securely - you generate a random ID on a secure service (e.g here in Finland, we use our online banking stuff for official verification purposes), give that ID to the website, and the only communication between the two of them is "Is id 123 valid and an adult? Yes/No".
Now, if that "secure service", most likely a government contract done as cheaply as possible turns out not to be, and they keep logs linking those IDs to the URLs requesting verification, then the entire thing goes belly up.
Zero Knowledge is more secure. Government signs a credential confirming date of birth and gives that to the citizen.
Citizen can then use that to create a proof they were born before date X. Verifier only sees the proof and the Government signature.
No need to trust 3rd party websites.
I was basically after that same concept - create that credential, and have the website only verify it's legit and nothing else.
I think my example of how it's currently done for basically everything in Finland just confused people, I wasn't suggesting every country implements adult age checks with their banks.