Solo Bitcoin mining in 2024 is like buying a single lottery ticket for a drawing that happens every 10 minutes — the odds of winning are astronomically low. A solo miner with even 100 ASICs might wait years between finding a block. Mining pools solve this problem by letting thousands of miners combine their hash rate and split rewards proportionally.
Foundry USA Pool, operated by Digital Currency Group subsidiary Foundry Digital, became the largest mining pool by 2023, controlling roughly 30% of Bitcoin’s hash rate. Its dominance reflects the institutional shift in mining — Foundry serves primarily North American publicly traded miners. AntPool (operated by Bitmain) and F2Pool are the other major players, each controlling 15-20% of hash rate.
The pool business model is surprisingly thin-margin. Pools typically charge 1-2% of mining rewards as fees. The real value for pool operators comes from adjacent services — firmware optimization, hash rate derivatives, lending against mining equipment, and data analytics. ViaBTC, which also runs CoinEx exchange, exemplifies the diversification strategy: the pool is a customer acquisition channel for higher-margin products.
Pool centralization raises important questions for Bitcoin’s security. If the top three pools collude, they could theoretically execute a 51% attack — controlling enough hash rate to rewrite recent transaction history. In practice, pool operators don’t own the hash rate; individual miners do, and they can switch pools instantly. This is a meaningful check on pool power, but it requires miners to actually pay attention and switch if a pool behaves badly. The 2014 GHash.io incident — when the pool briefly exceeded 50% of hash rate — demonstrated both the risk and the self-correcting mechanism: miners voluntarily left once the danger was publicized.
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