Hard Fork (of a Blockchain)

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A type of protocol change that validates all previously invalid transactions, and invalidates all previously valid transactions. This type of fork requires all nodes and users to upgrade to the latest version of the forked protocol software. In a hard fork, a single cryptocurrency permanently splits into two, resulting in one blockchain that follows the old protocol and the other that follows the newest protocol. Some examples are Bitcoin and Bitcoin Cash, or Ethereum and Ethereum Classic. *see Soft Fork.

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