At what block height did Bitcoin Cash fork from Bitcoin?

Bitcoin Cash forked from Bitcoin at block height 478558.

The hard fork occurred on 1 August 2017, splitting the Bitcoin network into the original Bitcoin chain and a new chain called Bitcoin Cash, or BCH. The two networks shared Bitcoin’s transaction history up to the fork point, after which they followed different consensus rules.

Bitcoin Cash emerged from a long-running dispute over how Bitcoin should scale. Its supporters favored larger blocks as a way to increase on-chain transaction capacity, while Bitcoin’s eventual SegWit-based roadmap pursued a different combination of transaction-format changes and scaling approaches.

Block 478558 is often confused with 481824, but they mark different 2017 events. Block 481824 is associated with SegWit activation on Bitcoin, not the Bitcoin Cash split. The fork also created a duplicated balance for holders, although using those coins safely required care because replay and transaction-handling issues were important around the split.