Four Bitcoin mining pools — Foundry, AntPool, ViaBTC, and F2Pool — collectively accounted for more than 70% of the network’s hashrate in a June 23, 2026 snapshot, intensifying concerns about mining concentration and its implications for Bitcoin’s decentralization. The figures come from miningpoolstats.stream, a widely referenced aggregator of pool-level hashrate estimates.
Hashrate Concentration Tops 70%
According to the June 23 snapshot, the combined share of the four largest pools surpassed 70% of total Bitcoin hashrate at that time. While pool shares fluctuate from day to day, the reading underscores the degree to which a handful of operators now dominate block production on the network.
Mining pools coordinate the work of many independent miners and distribute rewards based on contributed computing power. High concentration at the pool level does not necessarily mean a small number of physical operators control the hardware; however, it does concentrate block template creation and transaction selection among a few coordinating entities.
Why It Matters for Decentralization
Sustained concentration of hashrate raises well-known concerns for Bitcoin’s censorship resistance and security. If a small set of pools controls the majority of block production, coordinated transaction filtering or other policy choices could have outsized impact. Although a true 51% attack would still require significant coordination and incentives, concentration increases systemic risk relative to a more distributed pool landscape.
At the same time, miners can typically redirect their machines to different pools within hours, which can act as a market-based check on pool behavior. Industry advocates also point to emerging protocols that delegate more decision-making to individual miners, aiming to reduce the influence of pool operators over transaction selection.
A ‘Two‑Tier’ Market for Miners
Industry participants increasingly describe a two‑tier market that favors institutional clients, as larger operators often receive preferential fee terms, advanced risk‑management tools, or bespoke connections to pool infrastructure. This dynamic is prompting some independent miners to reassess which pools they support, weighing factors such as fees, payout methods, transparency in block construction, and jurisdictional exposure.
Data Caveats and Outlook
Pool share statistics are estimates and reflect a specific point in time; they can change quickly with price volatility, difficulty adjustments, and miners’ routing decisions. Still, the June 23 reading highlights the ongoing consolidation of pool influence across the network. Decentralization advocates and miners alike are likely to continue monitoring concentration metrics and evaluating technical and market mechanisms that could distribute block production more evenly.