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 the way miners organize their work can create concentration at the pool level. Mining pools combine the computing power of many individual miners, giving participants more consistent rewards while also making the pool a visible part of Bitcoin’s block-production landscape.

Minector’s internal weekly data shows a highly concentrated distribution of mined blocks. The largest category is Unknown, with 573 blocks and 53.4515% of the total. Among identified pools, AntPool leads with 213 blocks, followed by F2Pool with 167 and ViaBTC with 91.

Weekly Bitcoin Block Distribution

The dataset contains 1,072 Bitcoin blocks. The percentages below are the exact figures provided in the data; because they are displayed to four decimal places, their sum is 100.0001% rather than exactly 100%.

Who Mined the Most Bitcoin Blocks?

On the reported figures, the Unknown category mined the most blocks by a substantial margin. Its 573 blocks represent more than half of the weekly total, while AntPool is the largest named pool with 213 blocks and a 19.8694% share.

F2Pool ranks third overall at 167 blocks and 15.5784%. ViaBTC follows with 91 blocks and 8.4888%. These three named pools together account for 471 blocks, while all identified pools in the table account for 499 blocks and 46.5485% of the weekly distribution.

Braiins Pool recorded 19 blocks, or 1.7724%. BTC.com recorded 7 blocks, or 0.6530%, and Poolin recorded 2 blocks, or 0.1866%. The relatively small figures for these pools illustrate how uneven block production can appear across a single weekly sample.

Why the Unknown Category Matters

Unknown does not necessarily mean that one undisclosed mining operation controls more than half of Bitcoin’s network. It generally means that the available block-identification data could not confidently associate those blocks with a named pool or recognized label.

The category may include solo miners, private or untagged pool infrastructure, incomplete attribution, or several separate operators grouped under one label. Consequently, the 53.4515% figure should be treated as an attribution result, not as proof that a single entity controls 53.4515% of Bitcoin’s mining power.

What Mining Pool Concentration Means

A mining pool is an intermediary that coordinates miners. Participants contribute hashpower, receive work from the pool, and typically share rewards according to the pool’s payment method and the miner’s contribution.

This structure can improve income consistency for individual miners. Bitcoin mining rewards are probabilistic, so a small miner may wait a long time to find a block independently. Pool participation helps smooth that variability, although the miner normally pays a pool fee and relies on the pool’s software, payout system, and operational policies.

Concentration becomes a concern when a small number of pool operators account for a large share of observed block production. The relevant question is not only how many public pool names appear in a chart, but also whether those pools are genuinely independent and whether miners can quickly redirect their hashpower if a pool experiences a problem.

Centralization Risks and the 51% Attack

The theoretical 51% attack is the most widely discussed risk associated with excessive mining concentration. If one actor, or a sufficiently coordinated group of actors, controlled more than half of the network’s active hashpower, it could potentially reorganize recent blocks, reverse its own transactions, or conduct double-spending against merchants and services.

A majority hashpower position would not allow the attacker to create bitcoin from nothing, change the fixed supply, or spend coins belonging to other users without the required private keys. It would also not guarantee control over every future transaction. The main power would be the ability to compete successfully in block production and potentially replace parts of the recent chain.

Pool concentration is not identical to hashpower concentration. A pool may represent many independent miners that can leave, and the pool operator may not own or directly control their hardware. Conversely, several apparently separate pools could have relationships involving common ownership, infrastructure, or decision-making.

For this reason, a block-distribution chart is an important monitoring tool but not a complete measurement of decentralization. Hashrate estimates, pool ownership, miner distribution, geographic location, and the ease of switching pools all provide additional context.

Why One Week Should Be Interpreted Carefully

Bitcoin block production is probabilistic. Even if the underlying hashpower shares remain stable, the number of blocks found by each pool can vary from week to week because block discovery depends on chance.

A longer observation period can reduce the effect of short-term statistical variation. It can also reveal whether a pool’s position is persistent or whether an unusually strong or weak period produced the reported result.

The current data nevertheless highlights a practical issue: attribution quality matters. When the largest category is Unknown, analysts should avoid treating named-pool rankings as a complete map of the network. Better identification can make the distribution more useful, but it does not automatically prove that the underlying mining activity is more or less centralized.

How Miners and Users Can Respond

Individual miners can reduce dependence on a single pool by comparing payout terms, uptime, geographic infrastructure, fee structures, transparency, and the availability of backup pool connections. Supporting different pool operators can also help distribute decision-making across the ecosystem.

Miners should distinguish between a pool’s apparent size and the ownership of the hashpower behind it. A large pool may have many independent customers, while a smaller pool could still be closely tied to one organization. Reviewing pool policies and switching options is therefore more informative than relying on rankings alone.

Users and businesses can reduce exposure to transaction reversal risks by applying suitable confirmation policies for their circumstances. Exchanges and payment services commonly use their own risk controls, but these should be considered operational safeguards rather than guarantees against every possible network event.

Conclusion

The weekly distribution shows that Bitcoin block production was concentrated in a small number of reported categories. Unknown led with 573 blocks and 53.4515%, followed by AntPool with 213 blocks and 19.8694%, F2Pool with 167 blocks and 15.5784%, and ViaBTC with 91 blocks and 8.4888%.

These figures deserve attention, but they should not be read as definitive evidence that one organization controls most of Bitcoin’s hashpower. The Unknown label limits attribution, pool customers may be independent, and a single week cannot establish a long-term trend.

Mining concentration remains an important decentralization topic because excessive control by one actor or coordinated group could increase censorship, reorganization, and double-spending risks. At the same time, Bitcoin’s open participation model gives miners the ability to change pools, making ongoing measurement and transparent attribution essential for a balanced assessment.

Frequently Asked Questions

Which pool mined the most blocks in this weekly dataset?

The Unknown category recorded the most blocks, with 573 and a reported share of 53.4515%. Among named pools, AntPool ranked first with 213 blocks and 19.8694%.

Does the Unknown category represent one mining pool?

Not necessarily. Unknown is an attribution label that may include untagged pools, solo miners, private infrastructure, or blocks that could not be confidently matched to a recognized pool. It should not automatically be interpreted as one organization.

Does a large mining pool automatically control Bitcoin?

No. A pool may coordinate hashpower supplied by many independent miners. Those miners can potentially redirect their equipment, so pool block share is not the same as permanent ownership or direct control of the corresponding hashpower.

What would a 51% attack allow?

A majority-hashpower attacker could potentially reorganize recent blocks, censor selected transactions, or double-spend its own funds under certain conditions. It could not create bitcoin without limit, change the protocol’s supply rules by itself, or spend other users’ coins without their private keys.