Bitcoin Mining Pool Concentration in 2026: Who Is Mining the Most Blocks?

Bitcoin Mining Pool Concentration in 2026: Who Is Mining the Most Blocks?

Bitcoin mining remains a competitive global industry, but block production is not distributed evenly among all miners and mining pools. A weekly snapshot from Minector’s internal data shows that a small number of identified pools produced most of the blocks attributed to known operators, while the largest individual category was reported as Unknown.

This distribution is useful for understanding mining pool concentration, but it should be interpreted carefully. Block counts can fluctuate from week to week, and the Unknown category does not necessarily represent one mining company or a single coordinated source of hashpower.

Weekly Bitcoin Block Distribution

The dataset contains 1,055 blocks in total. The percentages below are the supplied figures and represent each category’s share of the weekly block distribution.

Who Mined the Most Bitcoin Blocks?

The Unknown category produced the most blocks in this snapshot, with 528 blocks and a reported share of 50.0474%. However, “Unknown” is a classification label rather than a confirmed mining pool name. It may include blocks whose coinbase tags were not clearly identified, blocks associated with less recognizable operators, or data that could not be confidently attributed.

Among the named pools, AntPool ranked first with 214 blocks, representing 20.2844% of the total. F2Pool followed with 178 blocks and 16.8720%, while ViaBTC accounted for 97 blocks and 9.1943%.

The remaining named pools had much smaller shares. Braiins Pool mined 18 blocks, BTC.com mined 15, Poolin mined 4, and Solo CKPool mined 1. Together, the named categories excluding Unknown account for 49.9526% of the reported block distribution.

What Mining Pool Concentration Means

Mining pool concentration describes how much Bitcoin block production is associated with a limited number of pool operators. A pool combines the computing power of many independent miners, distributes work, and shares rewards according to the contribution of participating machines.

As a result, a pool’s block share does not necessarily mean that the pool itself owns all of the underlying mining hardware. Individual miners can often change pools, and some large mining companies may distribute their machines across multiple pools to manage operational or counterparty risk.

This distinction is important when interpreting the weekly figures. Concentration at the pool level can be higher than concentration at the hardware-ownership level, because many separate miners may be using the same service. Conversely, a large industrial miner could potentially operate through several pool accounts or pool brands.

Block share is not identical to hashrate

Block counts are an observable result of mining activity, while hashrate is an estimate of computing power. Over a short period, luck and normal statistical variation can cause a pool to find more or fewer blocks than its underlying hashrate share might suggest.

For that reason, this one-week distribution should be treated as a snapshot rather than a permanent ranking. A longer observation period can provide a more stable view, while near-real-time figures may move substantially as miners change pools or network conditions shift.

Why Centralization Matters

Bitcoin’s security model depends on miners competing to validate transactions and extend the blockchain. Broad participation can make it more difficult for any single operator, company, or jurisdiction to influence transaction ordering or disrupt normal network operations.

Greater concentration can introduce several risks. A dominant pool might experience an outage that temporarily reduces the available mining capacity. It could also become a more attractive target for cyberattacks, regulatory pressure, infrastructure failures, or attempts to influence which transactions are included in blocks.

Pool concentration may also create governance and operational concerns. If many miners rely on one service, a change in pool policies, payout terms, software configuration, or transaction-selection practices could affect a substantial portion of the network’s block production.

These are risks to monitor, not proof that the Bitcoin network is currently controlled by one party. Mining pools compete for customers, miners can switch providers, and other participants can respond when concentration becomes a concern.

The Theoretical 51% Attack

A 51% attack refers to a situation in which one entity or coordinated group controls more than half of the network’s active mining power. With majority control, an attacker could have a higher probability of producing a competing chain and might attempt transactions such as double spending by reorganizing recent blocks.

Such control could also enable the attacker to delay or censor selected transactions, at least while the majority advantage continued. However, a 51% attack would not give the attacker unlimited power. It would not allow arbitrary creation of valid Bitcoin outside the protocol’s rules, direct theft of coins from unrelated addresses without private keys, or a unilateral change to the consensus rules accepted by the wider network.

A majority attack would also carry significant economic and reputational costs. Exchanges, merchants, nodes, developers, and miners could detect unusual reorganizations or censorship behavior and respond with additional confirmations, pool changes, software changes, or other defensive measures.

Does the Unknown category indicate a 51% attack?

No. The Unknown category is reported at 50.0474% in this dataset, but that figure should not be interpreted as proof that one entity controls more than half of Bitcoin’s mining power. The category represents blocks that were not attributed to a named pool in the available data, and it may contain multiple unrelated miners or pool operators.

In addition, block share is not a perfect measurement of current hashrate. A meaningful assessment would require more information about the identities behind the blocks, the time period, pool relationships, mining hardware ownership, and sustained hashrate over a longer interval.

How Miners and Users Can Reduce Concentration Risk

Mining companies can reduce dependency on a single pool by maintaining the technical ability to switch providers. Comparing payout systems, fees, uptime, geographic infrastructure, transparency, and backup connectivity can help miners make more resilient operational decisions.

Pool operators can support decentralization through transparent reporting, reliable infrastructure, open communication, and designs that give miners appropriate control over transaction selection. Solo mining remains difficult for most participants, but it eliminates reliance on a pool’s reward-distribution service.

For Bitcoin users, practical safeguards include waiting for an appropriate number of confirmations when transaction risk is significant and monitoring unusual chain reorganizations through reputable network data. Users should also remember that decentralization is broader than pool rankings: it includes independent nodes, diverse hardware manufacturers, geographic distribution, software implementations, and the ability of participants to change providers.

Conclusion

The weekly data shows a concentrated Bitcoin mining landscape, led by the Unknown category at 528 blocks and 50.0474%, followed by AntPool at 214 blocks and 20.2844%, F2Pool at 178 blocks and 16.8720%, and ViaBTC at 97 blocks and 9.1943%.

The most important qualification is that a pool’s reported block share does not automatically equal ownership of the underlying mining hardware. The Unknown classification also prevents a definitive conclusion about whether one organization controls a majority of network hashpower. Concentration deserves continued monitoring because it can increase operational and censorship risks, but the figures alone do not establish that a 51% attack is occurring.

Frequently Asked Questions

Which pool mined the most identified Bitcoin blocks?

AntPool mined the most blocks among the named pools in this dataset, with 214 blocks and a reported share of 20.2844%. The Unknown category was larger overall, with 528 blocks and 50.0474%, but it is not a confirmed named pool.

Does a 50.0474% Unknown share prove a 51% attack risk?

No. The Unknown label may include multiple separate miners or pools, and the figure is based on block attribution rather than definitive ownership of network hashrate. It is a reason to examine the data carefully, not evidence that one entity has majority control.

Can a mining pool control the Bitcoin network?

A pool with enough coordinated hashpower could create serious disruption, including attempted censorship or chain reorganizations. However, pool operators generally serve independent miners, who may switch providers, and a pool cannot use mining power to bypass all Bitcoin consensus rules.

Why can weekly block shares differ from actual hashrate shares?

Mining is probabilistic. A pool can find more or fewer blocks than expected during a short period because of statistical variation, changes in connected miners, network conditions, or the timing of the measurement window.