Tuesday, May 1, 2018

How Blockchains are immutable

Immutability is a crucial feature of blockchains: records once added in the blockchain are immutable. There is the possibility of rolling back the changes, but this is considered almost impossible to do as it will require an unaffordable amount of computing resources. For example, in case of bitcoin if a malicious user wants to alter the previous blocks, then it would need computing the Proof of Work (PoW) again for all those blocks that have already been added to the blockchain. This difficulty of redoing the PoW makes the records on a blockchain practically immutable.

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