Definition
A halving reduces a specified issuance reward by 50% under a network’s rules. In Bitcoin, it refers to halving the new-BTC subsidy per block every 210,000 blocks, approximately every four years. The precise calendar date depends on block production rather than a fixed appointment. Not all cryptocurrencies have this mechanism.
What Changes
A halving lowers the rate at which new units are issued; it does not halve existing balances or remove half the coins already circulating. In Bitcoin, transaction fees are separate from the subsidy, so total mining revenue is not forced to decrease by exactly 50%. Other networks using the word halving may follow different schedules or reward definitions.
Key Considerations
Reduced issuance is one factor in supply dynamics, while demand, liquidity and broader market conditions also affect price. A halving does not guarantee an increase in market value or a repeat of earlier cycles. For miners, profitability also depends on difficulty, equipment, energy and fees. Always identify the network and reward component before comparing halving events.