What is the pseudonym of Bitcoin's creator?

The pseudonym of Bitcoin’s creator is Satoshi Nakamoto.

Satoshi Nakamoto is the name used by the person or group that developed Bitcoin, wrote its 2008 white paper, and released the original software. Nakamoto mined Bitcoin’s genesis block on January 3, 2009, launching the network and embedding a newspaper headline about bank bailouts in that first block.

Nakamoto communicated with early developers and users online, but the person’s real identity has never been conclusively established. The name is therefore best described as a pseudonym, and it may represent one individual or a team. Nakamoto used the name until gradually stepping away from Bitcoin development in 2010 and 2011.

Nick Szabo and Hal Finney are frequently proposed in theories about Nakamoto’s identity, but neither is the canonical answer to this question. Vitalik Buterin is also not Nakamoto; he later co-founded Ethereum. The name refers to Bitcoin’s unidentified creator, not to a confirmed legal identity.