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FoundedJune 20, 2011
DefunctMay 22, 2012
Not to be confused with 21.

21bitcoin was a Hong Kong mining pool. The pool offered mining contracts[1] and a forum.

It is not known if the pool had ever solved a block. It shut down in 2011, but the site remained as a blog until the domain expired the following year.[citation needed]


  1. BitcoinTalk thread 17208. HK mining contract 15 June 2011.
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