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Hard Fork

A hard fork is a change to the blockchain protocol that makes previously invalid blocks/transactions valid, and therefore requires all users to upgrade their clients. The most recent example of a hard fork in public blockchains is the Ethereum hard fork which happened on July 21st, 2016. The hard fork changed the Ethereum protocol, therefore a second blockchain emerged (Ethereum Classic, ETC) which supports the old Ethereum protocol. In order to continue existing ETC needs miners, which would validate the transactions on the blockchain.

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