At which block height did Bitcoin’s fourth halving occur in April 2024?

Bitcoin’s fourth halving occurred at block 840,000 in April 2024.

A Bitcoin halving cuts the subsidy paid to miners for adding a valid block to the blockchain. At block 840,000, the block subsidy fell from 6.25 BTC to 3.125 BTC. The event occurred on 20 April 2024, although the exact clock time depended on when miners found the triggering block.

The halving was programmed into Bitcoin’s original protocol and is scheduled after every 210,000 blocks. It does not halve transaction fees, the total supply, or the number of bitcoins already held by users. It reduces only the newly issued mining subsidy.

Block height counts blocks in the chain, with the genesis block treated as height zero. This is why the fourth halving is identified by block 840,000 rather than by a simple calendar interval.