$BTC Bitcoin ($BTC) is the first and largest cryptocurrency by market capitalization, often viewed as digital gold. Launched in 2009 by the pseudonymous Satoshi Nakamoto, it operates on a decentralized, peer-to-peer network secured by proof-of-work consensus. Bitcoin has a fixed supply of 21 million coins, making it deflationary by design. In 2025, BTC continues to act as both a store of value and a macro-sensitive asset, reacting to inflation data, interest rates, and geopolitical events. Institutional interest remains strong, and BTC often leads the crypto market cycles. Its recent halving has tightened supply, influencing long-term bullish sentiment.