$BTC
Bitcoin (BTC) is the world's first and most well-known cryptocurrency, created in 2009 by an anonymous entity known as Satoshi Nakamoto. It's a decentralized digital currency, meaning it operates without a central bank or single administrator.
Bitcoin transactions are recorded on a public, distributed ledger called a blockchain, secured by cryptography. This technology ensures transparency and immutability. Users can send and receive BTC peer-to-peer globally, bypassing traditional financial intermediaries. With a finite supply of 21 million coins, Bitcoin is often seen as "digital gold" and a store of value, though its price can be volatile.