A possible protocol for practical anonymous age verification

Alice wants to access Bob's website, but doesn't want Bob to know who she is.

Bob is fine with not knowing Alice's identity but needs to verify her age meets certain criteria (over 21, between 13-18, or most commonly, 18 or over)

Charlie (probably a state actor) is an age-verification service. Charlie issues Alice a secure token with a keypair on it, protected by PIN, password, passphrase, etc.

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Bob generates a random identifier associated with the account Alice is …

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