$BTC Bitcoin, The abbreviation BTC. The very first decentralized cryptocurrency with the ideology of free market. Invented back in 2008 by Satoshi Nakamoto. As a currency bitcoin began in 2009 with the release of its open source implementation. As a legal tender El Salvador adopted Bitcoin in the year 2021. Some scholars describe this economics and other hand as an investment. Bitcoin as an asset is highly volatile and does not behave like any other conventional asset.