Bitcoin halving explained
Every 210,000 blocks the reward for mining a Bitcoin block is cut in half. What this means for miners and for new supply.
A halving is a built-in event in Bitcoin's rules: every 210,000 blocks — roughly every four years — the number of new bitcoin a miner receives for a block is cut in half.
Why it exists
Bitcoin's issuance is fixed in its software. Instead of a central bank deciding how much money to create, the schedule is known in advance by everyone. Halvings make new supply smaller and smaller over time until no new coins are created at all.
What changes for miners
Miners are paid with the block reward plus transaction fees. After a halving, the reward part becomes half as large. Miners with expensive electricity or old equipment may become unprofitable and stop, and the difficulty adjusts accordingly. Over the long term, transaction fees are expected to play a bigger role in paying for network security.
Past halvings
The block reward started at 50 BTC in 2009. Halvings have happened in:
- 2012 — the reward fell to 25 BTC;
- 2016 — to 12.5 BTC;
- 2020 — to 6.25 BTC;
- 2024 — to 3.125 BTC.
Because halvings are tied to block height, not to a calendar date, the exact day is known only approximately in advance. The schedule continues until the reward becomes too small to divide, around the year 2140.
What it does not guarantee
Halvings are often discussed in connection with Bitcoin's price, because new supply entering the market falls. However, the price depends on demand as well, and past patterns are no guarantee of the future. A halving is a supply event, not a price promise.
How to follow it
The next halving happens at a specific block height. You can follow the latest block height and fees on XFasil's On-chain analytics page.
University materials are for education only and are not investment, legal or tax advice.