What it is
The block subsidy is the part of the block reward that consists of newly generated bitcoins. It represents the issuance of new currency into the Bitcoin economy. This subsidy is pre-programmed to decrease by 50% approximately every four years through an event called the Bitcoin halving. This predictable reduction ensures Bitcoin's scarcity and its finite supply cap of 21 million coins, distinguishing it from fiat currencies.
The block subsidy's scheduled reduction through halvings is a critical factor influencing Bitcoin's long-term supply dynamics and often contributes to its "digital gold" narrative. Miners rely on the block subsidy as a significant portion of their revenue, especially in periods of lower transaction fees. Policy discussions sometimes involve the eventual reliance on transaction fees alone as the subsidy approaches zero.
Why it matters
The block subsidy is the mechanism for new Bitcoin issuance and its controlled, predictable reduction through halvings is fundamental to Bitcoin's scarcity and value proposition.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice