Bitcointalk, as a trademark title, was registered in August 2011. The forum's domain began as a directory of bitcoin dot org. Specifically, bitcoin.org/smf. Then, in 2010, it changed to forum.bitcoin.org and in August 2011, they moved it to bitcointalk.org after a long email discussion.

See: Forum moved to bitcointalk.org

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I'm disappointed no one has taken the time to write a little bit more about our forum, but indeed left an article that only describes really summarily its history and scams...