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 the distribution of recently mined blocks shows that block production is concentrated among a small number of participants. According to Minector’s internal weekly data, eight listed categories produced 1,009 Bitcoin blocks, with the largest share attributed to Unknown.

This result is important to interpret carefully. A mining pool’s share of blocks is not the same as ownership of all the underlying mining hardware, and an “Unknown” label does not automatically represent one identifiable organization. The figures provide a useful view of observed block distribution, while the broader question of Bitcoin mining centralization requires additional context.

Weekly Bitcoin Block Distribution

The table below shows the full distribution supplied for the measured week. The percentages are the reported shares of the 1,009 blocks in the dataset.

Unknown is the largest reported category

Unknown accounted for 520 blocks, representing 51.5362% of the recorded total. This is the most significant result in the dataset, but it should not be read as proof that a single undisclosed miner controlled 51.5362% of Bitcoin’s total hash rate.

Block attribution depends on identifying information included in a block, such as a coinbase tag. Some miners may not use recognizable tags, may change identifiers, or may be difficult for data providers to classify. As a result, Unknown can combine multiple independent miners rather than describe one coordinated pool.

AntPool, F2Pool and ViaBTC lead the named pools

Among the identifiable pools, AntPool produced the most blocks: 224, or 22.2002% of the weekly total. F2Pool followed with 150 blocks and a 14.8662% share, while ViaBTC recorded 93 blocks, equal to 9.2170%.

These three named pools are substantially larger than the remaining identified participants in this sample. Braiins Pool mined 11 blocks, BTC.com mined 9, and both Poolin and Ultimus recorded 1 block each, with each of the latter two representing 0.0991%.

What Mining Pool Concentration Means

Mining pools allow individual miners to combine their hash rate and receive more regular payouts. Instead of waiting for one miner to discover an entire block independently, a pool coordinates work from many participants and distributes rewards according to agreed payment rules.

This structure can make a pool appear powerful even when its hash rate comes from thousands of separate machines and operators. Pool concentration therefore measures where miners coordinate their work and how blocks are attributed; it does not necessarily measure the number of companies, facilities or jurisdictions that ultimately control the hardware.

There are several different ways to assess decentralization. Analysts may consider the distribution of hash rate, the number of active miners, geographic location, hardware ownership, pool operators, node distribution and the ability of miners to switch pools. A block distribution chart is valuable, but it captures only one part of this wider picture.

The 51% Attack: A Theoretical Risk

The term “51% attack” describes a situation in which one entity or coordinated group controls more than half of the network’s active mining hash rate. With that level of control, an attacker could potentially reorganize recent blocks, reverse its own transactions, or attempt double-spending against a merchant or exchange.

An attacker could not use a majority of hash rate to arbitrarily create unlimited Bitcoin, take coins from unrelated wallets without private keys, or change the basic rules of the network by mining alone. A majority attack is primarily a threat to transaction ordering and settlement reliability, especially for transactions with limited confirmation depth.

The current data should not be presented as evidence that a 51% attack is taking place. The largest category is Unknown, and the dataset does not establish that these blocks came from one entity, one pool operator or one coordinated group. Even if a pool appears to exceed half of observed blocks, the contributing miners may be independent and capable of moving their hash rate elsewhere.

Why pool control and hash-rate control differ

A pool generally constructs templates, distributes work and communicates with connected miners. Individual miners supply the hash rate and can often change their pool configuration when they disagree with a pool’s policies, fees or technical decisions.

This creates an important safeguard. A pool operator that attempted harmful behavior could lose participants, while miners could redirect their machines to another pool. However, switching may not happen instantly, and miners may face operational, contractual or geographic constraints. Pool-level concentration can therefore create governance and coordination risks even when it does not equal direct ownership of the majority of hardware.

Risks of Concentration Beyond a 51% Attack

Centralization can create risks that are less dramatic than a successful chain reorganization but still relevant. Large pools may become important points of failure if they experience outages, software bugs, connectivity problems or operational mistakes. A disruption affecting a major pool could temporarily reduce the efficiency of many miners at the same time.

Concentration can also increase the influence of a small number of operators over transaction selection, payout policies and software upgrades. Regulatory pressure or legal restrictions affecting a large pool could influence miners indirectly, particularly if alternatives are less accessible or less competitive.

At the same time, concentration statistics should not be interpreted as an automatic sign that Bitcoin is failing. Pools compete for customers, miners can switch providers, and the protocol continues to validate blocks according to its consensus rules. The practical risk depends on whether concentration reflects temporary variance, voluntary coordination, common ownership or durable control over a large portion of hash rate.

How Miners and Users Can Monitor the Situation

Miners should compare pool concentration data over time rather than relying on one weekly snapshot. A short period can be affected by normal statistical variation, changes in pool connectivity, miner migrations and differences in block-label attribution.

• Compare block distribution with reported or estimated hash-rate distribution.
• Review whether the Unknown category is rising because of genuine concentration or weaker attribution.
• Check the geographic and ownership diversity of major mining operations where reliable information is available.
• Consider pool switching options, payout terms, fees and operational reliability.
• For high-value transactions, use appropriate confirmation policies and assess exchange or merchant risk controls.

Users should also distinguish between a pool’s visible block share and the security assumptions of the Bitcoin network as a whole. No single chart can prove the presence or absence of an attack. It can, however, highlight where further investigation and monitoring are worthwhile.

Conclusion

Minector’s weekly data shows a concentrated Bitcoin block distribution, led by the Unknown category with 520 blocks and 51.5362%. Among named pools, AntPool led with 224 blocks and 22.2002%, followed by F2Pool with 150 blocks and 14.8662%, and ViaBTC with 93 blocks and 9.2170%.

The figures are a useful warning to examine mining coordination, but they are not conclusive proof of a single entity controlling most of Bitcoin’s hash rate. Unknown attribution, miner mobility and the difference between pool coordination and hardware ownership all matter. The balanced conclusion is that concentration deserves ongoing observation, while the theoretical 51% attack remains a security risk rather than a claim that such an attack is occurring.

Frequently Asked Questions

Does the Unknown category mean one mining pool controls 51.5362% of Bitcoin?

No. The Unknown category recorded 520 blocks, equal to 51.5362% of this dataset, but it may combine multiple miners or pools whose block-identification data was not recognized. The figure should not automatically be treated as evidence of one entity controlling that share of network hash rate.

Is AntPool the largest identifiable mining pool in the data?

Yes. AntPool produced 224 blocks and accounted for 22.2002% of the weekly distribution. F2Pool ranked next with 150 blocks and 14.8662%, while ViaBTC recorded 93 blocks and 9.2170%.

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

A pool could potentially coordinate a majority attack only if it controlled or could direct more than half of the relevant mining hash rate. However, pool participants may be independent and can often redirect their machines, so a pool’s reported block share is not identical to permanent control of that hash rate.

How should miners respond to high pool concentration?

Miners can monitor distribution trends, review pool policies and maintain the technical ability to switch providers. Diversifying across reputable pools can reduce dependence on one operator, although miners should also evaluate fees, payout systems, reliability and operational risks before changing pools.