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How could digitial age verification be possibly implemented with privacy in mind?
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Could have a system where a government site cryptographically signs a birth year plus random token provided by the site you want to use.
Step 1: access site
Step 2: site sends random token
Step 3: user's browser sends token plus user authentication information
Step 4: gov site replies with a string containing birth year, token, and signature
Step 5: send that string to the other site where it uses the government's public key to verify the signature, showing the birth year is attested by the government
No need to have any direct connection with the user's identity and the site or been the gov and site.
Unless the government buys the generated tokens from those websites. That's like the entire problem