OFF-TOPIC: Altcoin that forked from Bitcoin in 2017 to increase the maximum block size.
Bitcoin Cash is an altcoin which forked from Bitcoin in order to raise the maximum block size initially from 1 MB to 8 MB. And by the year 2018 increased the maximum block size from 8 MB to 32 MB as well as re-enabled Satoshi OP_Codes.
Bitcoin Cash activated when the Median Time Past of a block was after August 1st 2017 at 12:20 UTC. The first Bitcoin Cash block was at height 478559. Anyone who held Bitcoin prior to the fork had the same amount of Bitcoin Cash following the fork.
Bitcoin Cash implemented mandatory 2-way replay protection by adopting the Signature Hashing scheme described in BIP 143.