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

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

Mining pool concentration is one of the most important indicators of Bitcoin’s operational health. While Bitcoin mining is performed by many independent companies and individuals, miners often connect their equipment to pools to receive more regular and predictable payouts. As a result, a relatively small number of pools can appear responsible for a large share of recently mined blocks.

According to Minector’s internal weekly data, the largest reported category was Unknown, with 513 blocks and 48.2596% of the total. Among identifiable pools, AntPool mined the most blocks with 238, followed by F2Pool with 177 and ViaBTC with 106.

Weekly Bitcoin Block Distribution

The dataset contains 1,063 Bitcoin blocks. The figures show the share attributed to each pool or category during the measured week, but they should not be interpreted as a permanent ranking or a precise measurement of the ownership of all underlying mining hardware.

Unknown is the largest reported category

Unknown accounted for 513 blocks, or 48.2596% of the weekly total. This label generally indicates that the available block-identification data could not confidently associate those blocks with a named pool. It does not necessarily represent one mining company, one pool, or one coordinated group.

This distinction is essential when evaluating centralization. Treating Unknown as a single pool could make the distribution appear more concentrated than it actually is. At the same time, a high Unknown share reduces transparency, because observers cannot determine which operators or pool infrastructures produced those blocks from the available classification alone.

Which Named Pool Mined the Most Blocks?

AntPool was the leading identifiable pool in the sample, mining 238 blocks and recording a 22.3895% share. F2Pool followed with 177 blocks and 16.6510%, while ViaBTC produced 106 blocks and held 9.9718%.

Together, the three largest named pools accounted for 521 blocks. Their combined presence is significant, but it still does not automatically mean that three companies control the same proportion of Bitcoin’s mining hardware. Pool servers coordinate work and distribute rewards, while the miners connected to them may be separate businesses operating in different countries.

The remaining named pools had much smaller reported shares. Braiins Pool mined 16 blocks, or 1.5052%; BTC.com mined 11 blocks, or 1.0348%; and Poolin mined 2 blocks, or 0.1881%.

What Mining Pool Concentration Means

Bitcoin mining pools allow participants to combine their computational power for block discovery. Because finding a block is probabilistic, an individual miner could wait a long time between rewards. Pool participation smooths this uncertainty by sharing payouts according to contributed work, subject to each pool’s rules and fees.

Pool concentration therefore measures where miners direct their work, not necessarily how many entities own the machines. A pool with a large block share may include thousands of independent miners. Conversely, a mining company could operate equipment across several pool accounts or change pools when fees, service quality, payout terms, or network conditions change.

Block distribution is also a short-term statistical measurement. Bitcoin blocks do not arrive at perfectly regular intervals, and mining results can vary over a week. A pool may find more or fewer blocks than its underlying hash rate would suggest simply because block discovery is random.

Why Concentration Matters for Bitcoin

The theoretical 51% attack

The most frequently discussed risk is a theoretical 51% attack. If one entity or coordinated group controlled more than half of the network’s active mining hash rate, it could potentially reorganize recent transactions, reverse its own payments, or conduct double-spending against transactions that had not gained sufficient finality.

Such control would not allow the attacker to create bitcoins outside the protocol’s rules, steal coins from arbitrary addresses without private keys, or change Bitcoin’s fixed supply by itself. The attacker would still face economic costs, operational risks, and the possibility that exchanges, users, and other network participants would reject suspicious chain reorganizations.

For these reasons, a 51% attack is a serious theoretical threat rather than an automatic outcome of a high pool percentage. The relevant question is whether a single actor can direct enough real hash rate, not simply whether one pool appears to have a large share in a public block chart.

Censorship and transaction selection

Mining pools also influence which transactions are included in the blocks produced through their infrastructure. A highly concentrated pool market could create concerns about transaction censorship, selective inclusion, or pressure from governments and service providers.

However, Bitcoin miners can change pool connections, and individual miners may reject pool policies they consider unacceptable. The ease of switching depends on technical, financial, and contractual factors, so decentralization is strengthened when miners have several credible pool options.

Operational and regulatory risks

Large pools can become important points of failure. A software problem, network outage, cyberattack, payment disruption, or regulatory action affecting one major pool could temporarily reduce the effective hash rate available through that service.

This does not necessarily stop Bitcoin mining as a whole. Miners can often redirect their equipment to another pool, but the transition may cause delays, lost revenue, or temporary instability. A diversified pool market limits the impact of any single service failure.

How to Interpret This Week’s Data

The weekly distribution shows a substantial Unknown category and a leading identifiable pool, but it should be read cautiously. The Unknown share makes it impossible to assign all 1,063 blocks confidently to named operators, and the data does not reveal whether the Unknown blocks came from one organization or many independent sources.

It is also important to separate pool concentration from hardware concentration. If miners connected to AntPool, F2Pool, or ViaBTC are widely distributed among unrelated companies, the network may be less centralized than the pool figures suggest. If a small number of companies control most of the hash rate behind those pool accounts, the practical concentration risk would be higher.

For a more complete analysis, observers should compare several weeks or months of block distribution, examine pool policies and ownership, monitor changes in network hash rate, and consider how quickly miners could move between services. No single weekly snapshot can answer all of these questions.

Practical Implications for Miners

Individual miners should evaluate more than a pool’s recent block share. Important considerations include payout structure, minimum payout requirements, service reliability, geographic connectivity, fee transparency, support quality, and whether the pool provides tools that help miners monitor performance.

Miners may also consider distributing equipment across more than one pool where operationally practical. This can reduce dependence on one service and support a more diverse mining ecosystem, although it may add administrative complexity and affect payout management.

From a network perspective, competition between pools is valuable. A healthy mining market gives operators alternatives and makes it harder for one service, company, or policy decision to dominate Bitcoin’s block production for an extended period.

Conclusion

The weekly data shows that Unknown was the largest reported category with 513 blocks and 48.2596%. Among named pools, AntPool led with 238 blocks and 22.3895%, followed by F2Pool with 177 blocks and 16.6510%, and ViaBTC with 106 blocks and 9.9718%.

These figures highlight why mining pool concentration deserves attention, but they do not prove that any single entity controls a majority of Bitcoin’s mining power. Pool affiliation is not the same as hardware ownership, Unknown attribution limits visibility, and short-term block results can fluctuate.

The theoretical 51% attack remains an important security concept, as do censorship, outages, and regulatory risks. Nevertheless, Bitcoin’s resilience depends on more than one chart: it also relies on independent miners, the ability to switch pools, open verification by network participants, and continued competition among mining services.

Frequently Asked Questions

What was the largest Bitcoin mining category in the weekly data?

Unknown was the largest reported category, with 513 blocks and a 48.2596% share of the 1,063-block dataset. This label does not necessarily represent one pool or organization.

Which named Bitcoin mining pool mined the most blocks?

AntPool was the largest identifiable pool in the data. It mined 238 blocks, representing 22.3895% of the weekly total.

Does a large pool share mean that one company controls the same percentage of Bitcoin’s hash rate?

No. A mining pool coordinates work from potentially many independent miners. Its block share is an indicator of work directed through that pool, but it does not directly reveal the ownership or geographic distribution of the underlying hardware.

What would a 51% attack allow an attacker to do?

A party controlling more than half of active mining hash rate could potentially reorganize recent blocks, reverse its own transactions, or attempt double-spending. It could not arbitrarily take coins from addresses without private keys or create bitcoin outside the protocol’s rules. The attack would also carry substantial economic and reputational risks.