$BTC Bitcoin (BTC) is the world's first decentralized digital currency, created in 2009 by an anonymous entity named Satoshi Nakamoto. It operates on a peer-to-peer network, meaning transactions occur directly between users without central intermediaries like banks or governments. All transactions are recorded on a public, immutable ledger called the blockchain, secured by cryptography. This technology ensures transparency and prevents double-spending. Bitcoin's supply is capped at 21 million coins, a scarcity that contributes to its perceived value. It's primarily seen as an investment or a "digital gold," though some businesses also accept it as payment.