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How could digitial age verification be possibly implemented with privacy in mind?
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So how would you use it to solve this problem? There still needs to be some sort of foolproof way of saying “person X is only 14 years old”.
You would prove something like "I possess a private key that matches a public key that is in this list of public keys belonging to people at least X years old". But without revealing which item in the list is the specific one for you. Which is the zero knowledge proofs' cool trick.