25,371,123,731 Bitcoin (BTC) is the earliest and most influential cryptocurrency, launched by Satoshi Nakamoto in 2009. It utilizes blockchain technology, is decentralized, anonymous, and secure, supporting peer-to-peer transactions. The total supply of Bitcoin is fixed at 21 million coins and is regarded as "digital gold," gradually gaining recognition in investment, payment, and hedging areas. Price volatility is high, and regulatory policies are increasingly strengthened.