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Of course we have no way of telling that the voidnull website is by the same person as the voidnull HN account used to start this thread. Thats one problem with being anonymous, anyone can impersonate you, I can't think of any way to have a 'verified' account which is also anonymous.

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PGP signed messages.

a challenge based on public key crypto, user has a known public key and can sign a specified message with his private key to prove he owns that public key while remaining anonymous.

This also allows for password recovery in the opposite direction, site can publish passwords signed with users public keys and then users can decrypt their own using their private keys.

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