Why blockchain is immutable?

The blockchain network is designed in such a way that it becomes immutable. In a blockchain, the logs of transactions are created by an accord among the connected computers in the network i.e. chain’s participants. In simple words, once a blockchain transaction happens and successfully authorized by the sufficient level of validation mechanism it can never be reversed or replaced or edited. This trusted and reliable nature of the blockchain makes it legitimate as rewriting any block is just can't possible because enormous computing complexity is involved.

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