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I have my California Drivers License in my Apple Wallet.

I should be able to prove to iPhone apps that I am 18+ (only a binary yes/no with no metadata) by the apps making a local API call to iOS, which checks this information with the unexpired drivers license on device.

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That is trusting both Apple and the client, and also only works for iPhone.

We can do better with zero-knowledge-proof-based schemes, which also allow securely decoupling issuance/certification from online verification.

E.g. https://linc.cnil.fr/en/demonstration-privacy-preserving-age...

It's a privacy issue as long as Jim's Blackmail and Certificates, Inc. knows who they've certified.

I don't see why Google/Android can't implement the same solution.

What if you're born on February 29th?

What if you're borth on March 1st and it's currently February 29, 18 years later?

I don't know that I care for the solution, but why would the API have a problem with either of those scenarios? What datetime library are you using that does, and why haven't you switched?

Age Laws worry about dates. They don't care about leap years, time of birth or timezones.

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