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A hard fork is an event where a blockchain “splits” into two separate blockchains running parallel with each other, each with different parameters from a common previous chain. Even if the transaction history and parameters are the same before the hard fork, the history of both networks dissociates from one another after the event and any further activity beyond the fork will not reflect on the other. Hard forks can result accidentally from bugs/errors in the blockchain or be done intentionally. For instance, the proposal to hard fork Bitcoin in 2017 in order to increase its block size from 1 MB to 8 MB for faster and more transactions was met by strict opposition from the majority of the community. As a result, a part of the community split and formed Bitcoin Cash (BCH).

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