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What is a "hard fork" in blockchain?


Options are:

1-        A difficult decision in blockchain governance

2-        A radical change to the network`s protocol that makes previously invalid blocks/transactions valid (or vice-versa)

3-        A method for "forking" or copying someone else`s cryptocurrency

4-        A tool used for mining cryptocurrencies

Correct Answers is:


A radical change to the network`s protocol that makes previously invalid blocks/transactions valid (or vice-versa).