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How does the Bitcoin halving mechanism work?

What is Bitcoin halving is an important question for understanding why the network was designed as a scarce digital asset. In Bitcoin, new coins are issued through the block reward paid to miners who confirm transactions, and that reward is reduced at set intervals.

By rule, the halving takes place every 210,000 blocks. Since the average block time is roughly 10 minutes, the cycle spans about four years; however, because block production can vary, the exact calendar date is not known in advance.

What is the block reward and how does it decline?

The block reward is the amount of bitcoin miners receive when they add a new block. The system began with a 50 BTC reward, and each subsequent halving has reduced that amount step by step.

  • Initial reward: 50 BTC
  • 2012 halving: 25 BTC
  • 2016 halving: 12.5 BTC
  • 2020 halving: 6.25 BTC
  • April 20, 2024, block 840,000: 3.125 BTC

With the fourth halving in 2024, daily new supply fell from about 900 BTC to 450 BTC. That means the amount of new bitcoin entering the market was cut in half at once.

How is this tied to the 21 million supply cap?

At the center of Bitcoin’s economic model is the 21 million bitcoin supply cap. The halving mechanism ensures that new supply slows over time, preventing the upper limit from being exceeded in an uncontrolled way.

This structure creates a заранее known supply schedule, unlike traditional monetary systems. In other words, the amount of new bitcoin added to the market follows a predictable path under the network’s rules.

How is the next halving date calculated?

The halving date depends on block height, not directly on the calendar. The next halving will occur at block 1,050,000, and the block reward will fall to 1.5625 BTC.

Because blocks are not produced at a perfectly fixed pace, the exact day cannot be stated yet. Based on the current rate, expectations point to the spring of 2028 as the likely timeframe for the next milestone.

How does halving affect price and miners?

Discussions about price after a halving usually focus on supply and demand. The theory is that if new supply falls while demand holds steady or rises, the price may receive support.

That said, this argument is not considered sufficient on its own. Market expectations, global risk appetite, regulatory developments, liquidity conditions and investor behavior also play a role in price formation; for that reason, halving does not automatically produce a price outcome.

For miners, the revenue mix changes over time. By design, after each halving, miner revenue is structured to shift gradually away from the block reward and toward transaction fees in the long run, highlighting the balance between network security and economic incentives.

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