Bitcoin - WikipediaBitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Based on a free-market ideology, bitcoin was invented in 2008 by an unknown entity under the pseudonym of Satoshi Nakamoto.[5] Use of bitcoin as a currency began in 2009,[6] with the release of its open-source implementation.[7]: ch. 1  In 2021, El Salvador adopted it as legal tender.[4] It is mostly seen as an investm
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