12,799,920,955 Bitcoin ($BTC) is the world's earliest and most influential cryptocurrency, launched by Satoshi Nakamoto in 2009. It is based on blockchain technology and features decentralization, public transparency, and immutability. Bitcoin is generated through a 'mining' mechanism, with a total supply limited to 21 million coins, which is why many people consider it 'digital gold.' As a means of storing value and an investment asset, Bitcoin is widely accepted globally, driving the development of the entire cryptocurrency ecosystem. However, its price is highly volatile and it faces regulatory and technological challenges, making it a high-risk, high-reward investment target.