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A blockchain is a distributed database that maintains a growing list of individual records, called blocks [1]. These blocks are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. A blockchain is a decentralized, public digital ledger that is used to record transactions. Due to the distribution (mirroring) across many computers the newly entered records cannot be altered retroactively without the alteration of all subsequent blocks and the consensus of the network. There are different ways to achieve consensus within the network, e.g. Proof of Work (PoW), Proof of Stake (PoS), Delegated Proof of Stake (DPoS), etc. Visualization of the Bitcoin blockchain: ![blockchain.JPG]( src:
## References 1.