#btc Bitcoin (BTC) is a decentralized digital currency that operates without a central authority, using blockchain technology to record transactions. Launched in 2009 by an anonymous entity known as Satoshi Nakamoto, Bitcoin was designed as a peer-to-peer financial system. It enables users to send and receive payments securely and transparently across borders. Bitcoin's supply is capped at 21 million coins, making it deflationary and often compared to digital gold.