In what month and year did Satoshi Nakamoto last post on the BitcoinTalk forum?

Satoshi Nakamoto last posted on the BitcoinTalk forum in December 2010.

The final widely cited forum post was published on December 12, 2010, during a discussion about Bitcoin's possible use for WikiLeaks donations. Nakamoto was still involved in technical discussions at that point, including warnings about denial-of-service risks and the need for further development.

The date is often confused with April 2011 because Nakamoto later sent emails to developers, including Mike Hearn and Gavin Andresen. Those messages are generally treated as later private correspondence, not BitcoinTalk forum posts. Nakamoto's disappearance from public development is therefore usually dated to late 2010, even though traces of communication continued afterward.

Nakamoto's identity remains unknown, and “last post” means the last known post made under the Satoshi Nakamoto account—not proof of the person's final activity anywhere online.