$BTC Bitcoin (BTC), launched in 2009 by Satoshi Nakamoto, is the first decentralized cryptocurrency, operating on a peer-to-peer blockchain. It enables direct, intermediary-free digital transactions, secured by cryptography. Miners validate transactions via proof-of-work, earning BTC rewards. With a 21 million coin cap, its scarcity drives value. In 2025, BTC’s price hovers around $105,000-$110,000, up 52% year-over-year, with $110 billion in ETF assets. Used for payments, investment, and as "digital gold," it faces volatility, regulatory scrutiny, and environmental criticism due to mining energy use. Despite risks, Bitcoin’s dominance and adoption grow, shaping global finance.