I. What Is Halving
A fixed mechanism built into the Bitcoin code: every time 210,000 blocks are mined (about 4 years on average), the Bitcoin reward miners receive for mining a block is cut in half.
Bitcoin produces an average of 1 block every 10 minutes. Halving is triggered by block height, not by a fixed calendar date. Purpose of the design: to control the rate of new coin issuance, locking Bitcoin’s total supply cap at 21 million coins. The last coin is expected to be mined in 2140.
II. The complete history of four halvings
1. 1st Halving | 2012-11-28 Block 210,000: 50 → 25 BTC/block
2. 2nd Halving | 2016-07-09 Block 420,000: 25 → 12.5 BTC/block
3. 3rd time｜2020-05-11 Block 630000: 12.5 → 6.25 BTC/block
4. 4th time｜2024-04-20 Block 840000: 6.25 → 3.125 BTC/block (the most recent halving)
Next time (5th halving): expected in April 2028, block height 1,050,000. The reward drops from 3.125 to 1.5625 BTC per block; daily new output falls from 450 coins to 225 coins.
III. Halving brings 2 core impacts
1. Supply side: the production speed of new bitcoins declines
Halving directly reduces the amount of new BTC flowing into the market, lowering the annual inflation rate. After the 2024 halving, BTC’s annual inflation rate fell to 0.83%, below gold.
2. Shakeout in the mining industry
Miner revenue = block rewards + transaction fees. When the reward is halved, revenue is cut in half directly:
Electricity prices are high, and outdated inefficient mining rigs cost more than their revenue, forcing them to shut down and exit.
Hashrate may drop in the short term; the network difficulty automatically adjusts downward. Only miners with low electricity costs and high-performance rigs remain, increasing industry concentration.
IV. Common market misconceptions
Mistake 1: The moment halving happens, the coin price immediately surges
Historical pattern: bull markets often don’t erupt on the day of halving. More often, expectations are traded before halving, and when halving happens, “good news gets priced in and a selloff follows.” In previous bull cycles, most tops appeared 6–18 months after halving—not right after it.
Mistake 2: Halving = inevitable bull market
Halving is only supply shrinkage. The final price depends on multiple factors such as liquidity, macro interest rates, regulation, and institutional capital. There is no mechanism that guarantees a price increase; the past does not represent the future.
V. A simple one-sentence summary
Halving is Bitcoin’s built-in “capacity reduction” program: every four years it cuts the newly mined block reward in half, ensuring the total supply never exceeds 21 million. It’s the most important cyclical event in the crypto market, but it can’t be used as a buy/sell basis—risk is extremely high.
