It is a property that describes the inability to be changed or modified by anyone after its creation, especially over time. Immutability is considered to be the core defining feature of blockchain. This feature is required in blockchain networks as all of the nodes have to agree on the data validity in order to pass it on. Using the blockchain as a distributed ledger technology or DLT is to ensure that none of the individual entities can make any alterations to the records once they are added to the blockchain.
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