Someone claiming to be Satoshi posted on the bitcoin-dev mailing list that he's not Craig Wright, but he didn't sign anything with his PGP key. Ironically it could be a fake Satoshi stating that Craig Wright (another fake Satoshi) is not Satoshi. The real Satoshi would use his key to sign a message.
http://www.theguardian.com/technology/2015/dec/10/bitcoin-creator-satoshi-nakamoto-denies-being-craig-wright-maybeSomeone claiming to be bitcoin creator Satoshi Nakamoto has denied being the Australian entrepreneur Craig Wright, who was named as man behind the cryptocurrency by Gizmodo and Wired on Tuesday night.
In a posting to the bitcoin-dev mailing list with the subject line “Not this again.”, the email’s author wrote “I am not Craig Wright. We are all Satoshi.” The address the message was apparently sent from,
satoshi@vistamail.com, is one of the email addresses formerly used by the creator of bitcoin.
But email addresses are trivially easy to forge, and many remain unconvinced that this email did come from Nakamoto, rather than a fan who wants to protect their idol’s identity.
The style of the denial is similar to a posting made in March 2014 from another account associated with Nakamoto, after Newsweek named a Japanese American man named Dorian Satoshi Nakamoto as the real person behind the currency. Then, someone using an account formerly used by Satoshi posted “I am not Dorian Nakamoto” on a coding forum.
However, neither denial was enough to change the minds of many who were previously convinced. For one thing, both denials conspicuously fail to include the most convincing proof of identity: a cryptographic signature already known to be used by Satoshi Nakamoto. That would allow recipients to compare the publicly-available key for his genuine account with the signature of a particular message, and be certain that it came from the real Nakamoto.
Email headers are easy to forge, allowing senders to pretend that they are sending an email from an account they don’t have access to. Just four months ago, another email was sent to the bitcoin-dev mailing list in Satoshi’s name, decrying an unpopular proposal to alter the codebase of the currency. It was widely dismissed as a forgery.