#wikipedia.org. × bitcoin. Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Based on a free-market ideology, bitcoin was invented in 2008 by Satoshi Nakamoto, an unknown person. Use of bitcoin as a currency began in 2009, with the release of its open-source implementation.: ch. 1 In 2021, El Salvador adopted it as legal tender. It is mostly seen
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