Block Reward

A block reward is a form of incentive given to miners who successfully solve a block on a blockchain network. It is a predetermined amount of cryptocurrency given to the miner as compensation for their efforts in verifying and adding transactions to the blockchain ledger. Anyone with the technical capability and appropriate hardware can participate in mining and compete for block rewards, though the probability of successfully mining a block is proportional to the share of total network hash rate a miner controls. Block rewards serve the dual purpose of compensating miners for the real costs of hardware and electricity and introducing new cryptocurrency into circulation in a controlled, predictable manner.

In Bitcoin's design, the block reward halves approximately every four years in an event called the "halving," which reduces the rate at which new Bitcoin is created. Bitcoin launched with a block reward of 50 BTC, which has since been halved multiple times. This programmatic supply reduction is designed to create scarcity over time, contributing to Bitcoin's fixed maximum supply of 21 million coins. Halvings have historically coincided with or preceded significant bull markets, as the reduced new supply of Bitcoin entering the market creates upward price pressure when demand remains constant or grows.

As block rewards diminish over time, transaction fees become an increasingly important component of miner revenue. Users pay fees to have their transactions included in blocks, and during periods of high network congestion, these fees can rise substantially. Ethereum transitioned away from proof-of-work mining entirely in 2022, eliminating block rewards for miners and replacing them with validator rewards for those who stake ETH in the proof-of-stake system. This fundamental shift in incentive structures represents one of the most significant changes in blockchain consensus mechanisms to date.