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Bitcoin explained: How do cryptocurrencies work? - BBC NewsBitcoin is a digital currency -- also called cryptocurrency -- that can be traded for goods or services with vendors that accept Bitcoin as payment. Bitcoin and other cryptocurrencies (or 'crypto') are forms of currency that aren't controlled by any country or central bank. You can use. A Bitcoin ETF combines two prevalent forms of investment, ETFs and cryptocurrencies, into one package. A Bitcoin ETF aims to track the Bitcoin price.