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Bitcoin (abbreviated as BTC) is a decentralized digital currency proposed by Satoshi Nakamoto in 2008 and officially launched in 2009. It is based on blockchain technology and operates through a peer-to-peer network without the need for a central authority. Bitcoin is generated through 'mining', which involves solving complex mathematical problems to verify transactions and earn rewards. Its core features include decentralization, anonymity, transaction transparency, and immutability. The total supply of Bitcoin is limited, capped at 21 million coins, with approximately 19 million already issued as of now, and it is expected to be fully mined by 2140. It is widely used for investment, payments, and value storage, but its price is highly volatile, posing speculative risks. In recent years, Bitcoin has gradually gained acceptance in mainstream finance, with some countries and businesses allowing it as a means of payment, though regulatory policies vary by country.