Vanderpoole says he signed a message with Satoshi’s keys:

-----BEGIN BITCOIN SIGNED MESSAGE----- I am Vanderpoole and I have control of the private key Satoshi used to sign the first-ever Bitcoin transaction confirmed in block #170. This message is signed with the same private key. -----BEGIN BITCOIN SIGNATURE----- H4vQbVD0pLK7pkzPto8BHourzsBrHMB3Qf5oYVmr741pPwdU2m6FaZZmxh4ScHxFoDelFC9qG0PnAUl5qMFth8k= -----END BITCOIN SIGNATURE-----