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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 8 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.