In plain English
What Bitcoin halving means
Bitcoin pays a block producer from two sources: newly created bitcoin, called the block subsidy, and transaction fees included in the block. At each halving, only the subsidy is cut in half. Since Bitcoin targets roughly 10-minute blocks but actual block times vary, the date of a future halving can be estimated but is not fixed in advance.
Why it matters
The halving changes Bitcoin’s issuance rate and the composition of potential mining revenue. It does not automatically determine Bitcoin’s price, transaction fees, or miners’ profitability. For miners, the impact also depends on hash rate, mining difficulty, electricity costs, equipment efficiency, and the market value of bitcoin. For traders, widely anticipated events can still coincide with volatile markets.
Example
Suppose a simplified block pays a 6.25 BTC subsidy plus 0.50 BTC in transaction fees, for a 6.75 BTC block reward. After a halving, the subsidy becomes 3.125 BTC. If fees stayed at 0.50 BTC, the total would be 3.625 BTC. In practice, transaction fees vary from block to block.
Quick answers
Common questions
How often does a Bitcoin halving occur?+
Bitcoin’s subsidy schedule halves every 210,000 blocks. This is commonly described as about every four years because of the network’s target block interval, but the protocol uses block height rather than a calendar date.
Does Bitcoin halving stop miners from earning fees?+
No. The halving reduces the new-bitcoin subsidy. Miners can also receive transaction fees from the transactions included in a valid block, subject to the network’s rules and the fees users choose to attach.
Sources