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Bitcoin Forks Chronology – The Ultimate List of Forks Hard fork examples: The first: The significant first hard fork took place on August 1, 2017. The increase in block size is at the basis of the conflict. A group of developers wishing to return to the original size, that was originally "planned by Satoshi Nakamoto", 32 MB per block, and let the 1MB limit introduced in summer 2010 fall.