Block Reward
Learn what a block reward is in cryptocurrency mining and why it matters for miner incentives and coin issuance.
Definition
A block reward is the payment a cryptocurrency miner receives for successfully adding a new block of transactions to a blockchain. It usually includes newly created coins, transaction fees, or both. In proof-of-work networks like Bitcoin, the block reward is the main reason miners spend electricity, hardware, and time competing to find valid blocks.
How It Works
Miners gather pending transactions, build them into a candidate block, and search for a valid hash that meets the network’s difficulty target. The first miner to find a valid block broadcasts it to the network. If other nodes verify that the block follows the consensus rules, the miner is allowed to claim the block reward.
In many cryptocurrencies, the reward has two parts. The first part is the block subsidy, which is the new coin issued by the protocol. The second part is transaction fees, which are paid by users whose transactions are included in the block.
Bitcoin is the best-known example. Its block subsidy started at 50 BTC per block and is cut in half roughly every four years in an event called a halving. Over time, this reduces the rate at which new bitcoin enters circulation. Eventually, Bitcoin miners are expected to rely mostly on transaction fees rather than new coin issuance.
Other networks may use different reward schedules. Some keep rewards fixed for long periods, some reduce them gradually, and others adjust rewards through protocol upgrades. The basic purpose is the same: reward participants who help secure and maintain the network.
Why It Matters
Block rewards create the economic incentive behind mining. Without them, miners would have little reason to invest in specialized equipment, pay for power, and contribute hash rate to the network; mining operators often track these economics closely when evaluating hashprice and profitability.
They also affect supply. When a block reward includes newly issued coins, it determines how quickly new coins enter circulation. This can influence scarcity, inflation, miner revenue, and long-term network economics.
Block rewards are also important for security. Higher rewards can attract more miners, which can make a proof-of-work network harder to attack. If rewards fall too low and fees do not replace the lost income, some miners may shut down, reducing hash rate and weakening network security.
For users and investors, understanding block rewards helps explain why mining exists, why halvings matter, and why transaction fees become more important as a network matures.
Related Terms
FAQ
What is a Bitcoin block reward?
A block reward is the payment a miner receives for successfully adding a new block to the Bitcoin blockchain. It consists of newly created coins (the block subsidy) and transaction fees from the transactions included in the block. Currently, the block subsidy is 3.125 BTC per block after the 2024 halving.
How does the block reward halving affect miners?
Each halving cuts Bitcoin’s block subsidy in half, reducing the new coins miners earn per block. Miners must then rely more on transaction fees or operate with greater efficiency to stay profitable. Historically, halvings reduce sell pressure from miners and often coincide with changes in Bitcoin’s market price.
Will Bitcoin mining work after all block rewards are issued?
Bitcoin mining will continue after the final block subsidy is issued around the year 2140, but miners will earn revenue only from transaction fees. Whether fees alone can sustain sufficient network security is an ongoing debate, though rising transaction volume and fee markets may compensate for the lost subsidy over time.