$BTC Bitcoin ($BTC) is a decentralized digital currency introduced by Satoshi Nakamoto in 2009. It is based on blockchain technology and verifies transactions through a peer-to-peer network, without the need for banks or third-party intermediaries. The total supply of Bitcoin is capped at 21 million, giving it scarcity, and it is often referred to as 'digital gold'. Due to its decentralization, censorship resistance, and the convenience of cross-border transfers, it has attracted a large number of investors and institutions. However, its challenges include significant price volatility, high energy consumption, and regulatory uncertainty. Currently, Bitcoin is gradually being recognized in the global financial system as an important digital asset.