$BTC Bitcoin (BTC) is a decentralized digital currency, created in 2009 by Satoshi Nakamoto. It operates on a peer-to-peer network, free from central bank control. Transactions are secured by cryptography and recorded on a public ledger called the blockchain. New bitcoins are "mined" by solving complex computational problems. With a limited supply of 21 million units, Bitcoin serves as both a medium of exchange and a store of value, making it a unique asset.