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 is designed to be decentralized, but miners commonly work through pools to make income more predictable. A mining pool combines the hashrate of many participants and distributes rewards according to each miner’s contribution. As a result, the distribution of newly mined blocks between pools provides an important, although imperfect, view of mining concentration.

Minector’s weekly Bitcoin block distribution shows a large share attributed to “Unknown,” followed by AntPool, F2Pool and ViaBTC. The figures do not automatically prove that one organization controls the network, because a pool’s reported identity, its underlying miners and the ownership of that hashrate are separate questions.

Weekly Bitcoin Block Distribution

The dataset contains 935 Bitcoin blocks across seven listed pool categories. “Unknown” accounted for 484 blocks, while the named pools collectively represented the remaining 451 blocks.

Unknown was the largest category by a substantial margin, with 484 blocks and 51.7647% of the reported total. AntPool followed with 174 blocks and 18.6096%, while F2Pool mined 169 blocks and recorded 18.0749%.

ViaBTC contributed 87 blocks, equal to 9.3048% of the weekly distribution. The remaining named pools had much smaller shares: Braiins Pool mined 15 blocks, BTC.com mined 4, and Solo CKPool mined 2.

What Does “Unknown” Mean?

An unknown label generally means that the block’s coinbase information or other identifying data could not be confidently matched to a recognized pool. It should not be interpreted automatically as a single mining company, a secret pool or a coordinated group.

Several factors can produce an unknown classification. A miner may use a private or customized coinbase tag, a pool may not use a widely recognized identifier, or the available data may not provide enough information for reliable attribution. Some large operations may also mine through arrangements that make public identification difficult.

This distinction is essential when assessing concentration. If the 484 unknown blocks were actually spread across many independent miners or smaller pools, the network could be less concentrated than the headline percentage suggests. If much of that hashrate belonged to one coordinated operator, the concentration concern would be greater.

Why Mining Pool Concentration Matters

Mining pools do not own Bitcoin’s consensus rules, but they coordinate the work performed by participating miners. Pool operators typically distribute mining jobs, collect information about valid blocks and handle reward accounting. This gives them operational influence even when the underlying hashrate belongs to many independent businesses and individuals.

A concentrated pool market can create several risks. A large pool may influence which transactions are included in blocks, how quickly miners adopt software changes or how the network responds to unusual events. Operational failures, censorship decisions or a security breach at a major pool could affect a significant amount of visible mining activity.

Concentration can also make the ecosystem more vulnerable to regulation, infrastructure outages or coordinated pressure. These risks are not the same as control of the Bitcoin network, but they are relevant to miners choosing where to direct hashrate and to users evaluating the resilience of the mining sector.

Theoretical 51% Attack Risk

A 51% attack refers to a situation in which one entity or coordinated group controls more than half of Bitcoin’s mining hashpower. With that majority, an attacker could theoretically reorganize recent transactions, attempt double-spending against a party that accepts unconfirmed or insufficiently confirmed payments, or prevent selected transactions from being confirmed for a period of time.

This does not allow the attacker to create coins outside Bitcoin’s issuance rules, steal coins from arbitrary addresses without private keys or change the protocol unilaterally. The practical impact would depend on the attacker’s strategy, the duration of control and how exchanges, merchants, nodes and other miners respond.

The weekly data shows Unknown at 51.7647%, which is above the 50% threshold when treated as one unified source. However, the label alone does not establish that these blocks came from one entity, and a block-distribution percentage is not definitive proof of current hashpower ownership. A measured result should therefore be viewed as a monitoring signal, not conclusive evidence of a 51% attack capability.

Even if a pool briefly appeared above 50%, sustaining an attack would be expensive and technically visible. Other miners could redirect hashrate, exchanges could increase confirmation requirements, and developers and node operators could coordinate defensive responses. Those possibilities reduce the likelihood of a successful attack, but they do not eliminate the importance of preventing excessive concentration.

How Pool Concentration Should Be Interpreted

Block shares naturally fluctuate over short periods because mining is probabilistic. A pool can find several blocks close together or experience a period without a block, even when its average hashrate has not changed significantly. For that reason, a single week should not be treated as a complete picture of long-term mining power.

Block data can also differ from hashrate estimates. Hashrate is an estimate of computational work being performed, while block counts reflect the outcomes of that work. A longer observation window, pool-reported hashrate, miner distribution and changes in pool membership can provide a more reliable assessment.

It is also useful to distinguish pool concentration from hardware concentration. Many independent miners can direct their machines to one pool, creating a high pool share without giving the pool operator ownership of all that equipment. Conversely, a small number of companies could control substantial hardware while distributing it across several pools.

What Miners Can Do

Individual miners can reduce dependency on a single pool by comparing several established services and considering more than headline payout rates. Important factors include fee structure, payout method, uptime, transparency, server availability, account security and the pool’s approach to transaction selection.

Some miners may choose to split their hashrate between pools, provided that the operational complexity and payout rules make sense for their business. Others may consider solo mining, although the irregular nature of solo rewards can make income highly unpredictable for smaller operators.

Pool operators can support decentralization by publishing clear information about connected hashrate, encouraging geographically diverse participation and avoiding unnecessary control over transaction selection. Better attribution of unknown blocks would also improve public analysis and reduce uncertainty around concentration measurements.

Conclusion

The weekly distribution is led by Unknown with 484 blocks and 51.7647%, followed by AntPool with 174 blocks and 18.6096%, F2Pool with 169 blocks and 18.0749%, and ViaBTC with 87 blocks and 9.3048%. Braiins Pool, BTC.com and Solo CKPool accounted for smaller reported shares of 1.6043%, 0.4278% and 0.2139%, respectively.

The most important conclusion is not that a 51% attack is taking place. Rather, the data highlights why accurate pool identification and longer-term monitoring matter. Unknown attribution makes the apparent concentration difficult to interpret, while the combined presence of several major named pools shows that Bitcoin mining remains distributed across multiple participants. Miners and observers should treat concentration as an ongoing operational and governance risk, not as proof of an immediate network failure.

Frequently Asked Questions

Does Unknown mean one mining pool controls 51.7647% of Bitcoin mining?

No. Unknown is an attribution category, not necessarily a single pool or organization. The 484 blocks may represent multiple miners, private pools, unidentified coinbase tags or data that could not be matched confidently to a known operator.

Can a mining pool launch a 51% attack by itself?

In theory, a pool could coordinate enough participating hashrate to exceed 50% if its miners followed an attack strategy. In practice, miners are independent economic actors and could leave a pool if its actions threatened Bitcoin’s value or their own business interests.

Is block share the same as mining hashrate?

No. Block share is based on blocks found during a specific period, while hashrate is an estimate of computational power. Because mining outcomes are probabilistic, longer periods and additional data are needed to estimate sustained hashrate more accurately.

How can miners support Bitcoin’s decentralization?

Miners can compare multiple pools, diversify where practical, review pool policies and consider the security and transparency of each service. Pool operators can also improve attribution, publish useful operational information and avoid unnecessary central control over mining participants.