What is Halving?

The halving is the moment, roughly every four years, when the reward paid to Bitcoin miners for each block is cut in half. It is written into the protocol: 50 bitcoin per block at launch, 25 in 2012, 12.5 in 2016, 6.25 in 2020, 3.125 in 2024, and so on until the supply approaches twenty-one million around the year 2140. It is the mechanism that makes bitcoin's supply schedule predictable.

Its economic effect is a drop in new supply entering the market. Miners receive fewer coins to sell, so if demand holds, the flow of sell pressure from issuance falls. This is the basis of the popular narrative that halvings precede bull markets, which has been true so far and is also a sample of four events with many other things happening at the same time.

For miners it is a shock. Revenue per block halves overnight while costs do not, so less efficient operations shut down until the difficulty adjustment and the price restore margins. Hash rate typically dips and recovers, and the industry consolidates a little each cycle.

For a holder the halving changes nothing about what you own and something about the story around it. It is worth understanding the schedule to see through both the hype and the dismissal: the supply effect is real and small in any given month, and the price effect, if any, is neither guaranteed nor timed.

Other chains have their own issuance schedules, from Litecoin's halvings to Ethereum's issuance set by the staking rate. A portfolio view does not need any of them; a holder deciding how much bitcoin to hold might.

The next halving is expected in 2028, and the block reward will fall to 1.5625 bitcoin. By then transaction fees, not new coins, are expected to carry an increasing share of miner revenue, which is the long-term question the schedule leaves open.