$BTC Bitcoin (BTC), as the first decentralized cryptocurrency, has fundamentally changed the financial landscape since its inception in 2009. Based on blockchain technology, it has a fixed total supply (21 million), anonymity, and anti-inflation characteristics, making it known as 'digital gold.' The bull market of 2021 propelled BTC to break through $60,000, but its extreme volatility has also sparked controversy. Institutional investors and companies like Tesla have helped drive its mainstream adoption, while countries have shown varied regulatory stances (such as China's ban and El Salvador's adoption as legal tender). Currently, BTC faces key issues such as Layer 2 scalability, ETF approvals, and halving cycles, coexisting as a long-term store of value and a short-term speculative asset, continuously impacting global financial markets.