According to Oxford Dictionary, Blockchain is a system in which a record of transactions made in bitcoin or another cryptocurrency are maintained across several computers that are linked in a peer-to-peer network.
The dictionary also defined it as "A digital ledger in which transactions made in bitcoin or another cryptocurrency are recorded chronologically and publicly."
Wikipedia describes Blockchain as a growing list of records, called blocks, which are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a merkle tree root hash).
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