A blockchain , [1] [2] [3] originally block chain , [4] [5] is a growing list of records , called blocks , that are linked using cryptography . [1] [6] Each block contains a cryptographic hash of the previous block, [6] a timestamp , and transaction data (generally represented as a Merkle tree ). By design, a blockchain is resistant to modification of the data. It is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way". [7] For use as a distributed ledger , a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for inter-node communication and vali...
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