Bitcoin is a cryptocurrency and worldwide payment system. It is the first decentralized digital currency, as the system works without a central bank or single administrator. The network is peer-to-peer and transactions take place between users directly, without an intermediary.
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A blockchain originally block chain is a continuously growing list of records called blocks which are linked and secured using cryptography. Each block typically contains a hash pointer as a link to a previous block a timestamp and transaction data. By design blockchains are inherently resistant to modification of the data.
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