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Bitcoin Hard Fork

A fork occurs when enacting a new set of rules. A hard fork is a permanent change/divergence in the blockchain protocol and is not backwards compatible. This means that nodes that haven’t upgraded can’t validate blocks that have been created by upgraded nodes which follow newer consensus rules.

A good example of a Bitcoin hard fork is the one that took place between bitcoin (BTC) and bitcoin cash (BCH), due to the recommended different approaches to scale and process more transactions.

Note: These are non-technical definitions meant for a general audience and should not be used as legal definition
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