Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Based on a free-market ideology, bitcoin was invented in 2008 when an unknown entity published a white paper 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 …