In May 2016, Australian entrepreneur Craig Wright claimed to the
BBC, The Economist, and GQ that he was Satoshi Nakamoto, the creator of Bitcoin. During this time, he attempted to demonstrate his identity by signing a message using private keys associated with early Bitcoin blocks (sometimes referred to as "Satoshi's keys" or early blocks) in a private, staged session with journalists and Bitcoin community members, including Gavin Andresen.
Key details regarding the BBC show and "genesis wallet" claims:

The "Proof" Session: Wright, along with Jon Matonis (founding director of the Bitcoin Foundation) and Gavin Andresen (chief scientist at the Bitcoin Foundation), held a meeting where he claimed to sign an arbitrary message ("Gavin's favorite number is eleven. CSW") using a key from an early block, though the BBC reporter, Rory Cellan-Jones, noted he did not definitively sign the genesis block itself, but rather an early block, and later failed to provide public, verifiable proof.