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 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.
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.