user323: Should Satoshi decide to reveal his or her true identity, how can one know the person is the real creator of Bitcoin, rather than a person who hacked the forum login, email address or the like? In other words, what methods of authentication did Satoshi use that could clearly identify him or her?

user238: He can prove that he has the private key matching the address used in the genesis block.

user403: He has a PGP public key which he can use to sign things.

323: <p>Should Satoshi decide to reveal his or her true identity, how can one know the person is the real creator of Bitcoin, rather than a person who hacked the forum login, email address or the like? In other words, what methods of authentication did Satoshi use that could clearly identify him or her?</p>
 238: <p>He can prove that he has the private key matching the address used in the genesis block.</p>
 403: <p>He has a <a href="https://bitcointalk.org/Satoshi_Nakamoto.asc">PGP public key</a> which he can use to sign things.</p>
