What it is
Individual Bitcoin miners, especially those with less powerful hardware, face long odds of independently solving a block and receiving the block reward. By joining a mining pool, participants contribute their hash rate to a collective effort. When the pool successfully mines a block, the block reward (newly minted bitcoins and transaction fees) is distributed among all members proportionally to the amount of hash rate they contributed.
Mining pools are crucial for the practical operation of Bitcoin mining, allowing smaller miners to achieve more consistent, albeit smaller, payouts. The concentration of hash rate within a few large mining pools is a frequent topic in discussions about Bitcoin's decentralization and security. Excessive concentration could theoretically increase the risk of a 51% attack, though this is mitigated by the open nature of pools and the ability of miners to switch.
Why it matters
Mining pools illustrate how Bitcoin's security and reward system work in practice and are relevant to discussions about the network's decentralization and potential vulnerabilities.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice