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A blockchain is a growing list of records, called blocks, that 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). By design, a blockchain is resistant to modification of its data. This is because once recorded, the data in any given block cannot be altered retroactively without alteration of all subsequent blocks. 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 validating new blocks. Although blockchain records are not unalterable, blockchains may be considered secure by design and exemplify a distributed computing system with high Byzantine fault tolerance. The blockchain has been described as "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way".
W Blockchain
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3.   Visa: Digital Dollar currency on Blockchain, patent filed - Forbes
Published: 14 May 2020   |   250 views · 4 days ago
4.   Microsoft and Accenture reveal blockchain ID system for refugees at ID2020 Summit - ZDNet
Published: 20 Jun 2017   |   185 views · 5 days ago

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