$BTC BTC (Bitcoin) is the original decentralized digital currency, created in 2009 by an anonymous entity known as Satoshi Nakamoto. It operates on a public, distributed ledger called a blockchain, enabling peer-to-peer transactions without central banks or intermediaries. Bitcoin is "mined" by powerful computers solving complex cryptographic puzzles, and its supply is capped at 21 million, contributing to its "digital gold" perception. It functions as both a medium of exchange and an investment asset.