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Definition of 'Bitcoin': A digital or virtual currency that uses peer-to-peer technology to facilitate instant payments. Bitcoin is a type of alternative currency known as a cryptocurrency, which uses cryptography for security, making it difficult to counterfeit. Bitcoin issuance and transactions are carried out collectively by the network, with no central authority. The total number of Bitcoins that will be issued is capped at 21 million to ensure they are not devalued by limitless supply. They are divisible to eight decimal places; Bitcoin fractions are called satoshis. Users store their Bitcoins in a digital wallet, while transactions are verified by a digital signature known as a public-encryption key. Investopedia explains 'Bitcoin' The first Bitcoin specification and proof-of-concept was published in 2009 by an individual or individuals under the pseudonym Satoshi Nakamoto. Satoshi left the project toward the end of 2010, leaving the motivatio