$BTC Bitcoin (BTC) is the world's first and largest decentralized digital currency, launched in 2009 by Satoshi Nakamoto. It allows peer-to-peer transactions without intermediaries, using a decentralized ledger technology called blockchain. Bitcoin is limited to 21 million coins, making it a scarce asset. Its value has fluctuated over time, with significant price increases and decreases. Bitcoin is widely recognized and accepted as a form of payment, investment, and store of value.