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 competitive by design, but miners commonly coordinate through pools to reduce income volatility. Instead of waiting to discover a block independently, participants contribute hash rate to a pool and receive rewards according to the work they perform.

This makes mining pools important indicators of how Bitcoin’s hash rate is distributed. Minector’s internal weekly data records 1,083 Bitcoin blocks across seven identified pool categories, including an Unknown category. The figures show a highly concentrated distribution at the pool-label level, although the Unknown classification means the results require careful interpretation.

Weekly Bitcoin block distribution

Unknown is the largest category in the dataset, with 552 blocks and 50.9695% of the weekly total. This does not necessarily mean that a single unidentified mining pool produced more than half of all blocks. It indicates that the relevant block attribution data did not identify those blocks under a named pool.

Named pools behind the Unknown category

Among the named pools, AntPool leads the weekly distribution with 212 blocks, representing 19.5753%. F2Pool follows with 189 blocks and 17.4515%, while ViaBTC recorded 101 blocks and 9.3259%.

The remaining named pools account for much smaller portions of the sample. Braiins Pool mined 16 blocks, BTC.com mined 10, and Poolin mined 3. These differences reflect the measured block distribution for this week, but a single week should not be treated as a permanent ranking because Bitcoin block discovery is probabilistic.

What Bitcoin mining centralization means

Mining centralization describes a situation in which a relatively small number of entities control, coordinate, or direct a large share of Bitcoin’s total hash rate. The concern is not simply the number of pool brands visible in a dashboard. It also involves the ownership of mining hardware, relationships between pools and large miners, geographic concentration, energy dependencies, and the ability to make or enforce decisions.

A pool usually does not own every machine contributing to its reported hash rate. Independent miners may point their hardware to a pool because it offers predictable payouts, technical infrastructure, low latency, or convenient monitoring. As a result, a pool’s block share is best understood as an indicator of coordinated hash rate, not automatically as proof that one company owns the same percentage of all Bitcoin mining equipment.

The weekly data nevertheless highlights why attribution matters. If the Unknown category represents many independent miners or multiple unrecognized pools, the network may be more distributed than the headline figure suggests. If a large portion comes from one identifiable operator whose blocks are not being labeled correctly, the apparent concentration could understate that operator’s influence.

Why pool concentration matters

Operational and infrastructure risk

Large pools provide valuable infrastructure, but dependence on a small group of operators can create operational risks. A software failure, connectivity problem, cyberattack, regulatory disruption, or payout issue affecting one major pool could temporarily affect the miners connected to it.

These events would not necessarily stop Bitcoin itself. Miners can often redirect their equipment to another pool, and other participants continue producing blocks. However, a significant disruption could reduce effective hash rate for a period, increase confirmation uncertainty, or create financial pressure for affected mining businesses.

Transaction selection and censorship

Mining pools typically construct candidate blocks, including decisions about which transactions to select. A pool with substantial coordinated hash rate could attempt to exclude certain transactions or apply a particular policy. Persistent censorship would be difficult if other miners continue accepting and confirming those transactions, but concentration can make such behavior more disruptive.

Pool protocols and miner choice provide an important counterbalance. Miners can leave a pool if its policies become unacceptable, although switching may involve technical, contractual, or economic costs.

The theoretical 51% attack

The commonly discussed 51% attack refers to a party or coordinated group controlling more than half of the network’s mining hash rate. With that level of power, an attacker could potentially reorganize recent transactions, reverse its own payments under certain conditions, or prevent selected transactions from being confirmed for a period.

This does not give the attacker unlimited control. A majority miner cannot arbitrarily spend coins from other users without their private keys, create valid coins outside Bitcoin’s consensus rules, or permanently rewrite the entire blockchain at will. The attack would also be expensive, visible, and likely to damage the value of the system the attacker is using.

Pool concentration is therefore a risk indicator, not evidence that a 51% attack is taking place. A pool’s reported share may represent many independent miners who could redirect their hash rate. Coordination, intent, geographic access, and the duration of control would all matter in a real attack scenario.

How to interpret this week’s figures

The clearest observation is that Unknown accounts for 552 blocks, or 50.9695% of the weekly distribution. AntPool is the largest named pool at 212 blocks and 19.5753%, followed by F2Pool at 189 blocks and 17.4515%. ViaBTC is the fourth-largest category overall with 101 blocks and 9.3259%.

Looking only at named labels, the data shows several significant participants rather than one named pool dominating the entire sample. However, treating Unknown as a single pool would produce a misleading conclusion because the category is an attribution label, not necessarily an individual operator.

Block counts also fluctuate naturally. Bitcoin’s block interval is probabilistic, so a pool can find more or fewer blocks than its underlying hash-rate share might imply during a particular week. Longer observation periods, consistent labeling, and direct hash-rate measurements are useful for identifying durable trends.

How the mining ecosystem can reduce concentration risks

• Improve attribution: Clear coinbase signatures and reliable monitoring can reduce the size of Unknown categories and make analysis more meaningful.
• Maintain miner choice: Miners can consider multiple pools, payout structures, geographic locations, and technical policies rather than relying on one provider.
• Support decentralized pool protocols: Designs that give individual miners greater control over block construction can reduce the influence of a centralized pool coordinator.
• Monitor ownership and geography: Pool statistics should be reviewed alongside information about hardware operators, facilities, jurisdictions, and infrastructure dependencies.
• Use longer-term data: Weekly results are useful snapshots, but multi-week and multi-month trends provide a stronger basis for judging concentration.

These measures do not eliminate all risks. They can, however, make it easier for miners to respond if a pool becomes unreliable, overly influential, or aligned with policies that participants do not support.

Conclusion

The weekly distribution shows 1,083 Bitcoin blocks, with Unknown at 552 blocks and 50.9695%. Among the named pools, AntPool leads with 212 blocks and 19.5753%, followed by F2Pool with 189 blocks and 17.4515%, and ViaBTC with 101 blocks and 9.3259%.

The data suggests that pool-level coordination deserves attention, but it does not by itself prove that one entity controls more than half of Bitcoin’s mining hardware or that a 51% attack is imminent. The Unknown category is especially important: better attribution could reveal a more distributed network or identify concentration that current labels do not show. The most balanced approach is to monitor the trend, understand how pool hash rate differs from hardware ownership, and preserve meaningful choice for miners.

Frequently Asked Questions

Which pool mined the most Bitcoin blocks in this weekly data?

Unknown was the largest category with 552 blocks and 50.9695%. Among the named pools, AntPool ranked first with 212 blocks and 19.5753%.

Does Unknown mean one mining pool controls 50.9695% of Bitcoin?

No. Unknown means the blocks were not attributed to a named pool in the dataset. They may represent several pools, private miners, incomplete labeling, or other sources that cannot be identified from the available data.

Does a large pool automatically control a majority of Bitcoin’s hash rate?

No. Pools coordinate miners, but the participating hardware may belong to many independent companies and individuals. Miners can potentially switch pools, so block share should not automatically be treated as hardware ownership or permanent control.

What would a 51% attack allow?

A party controlling more than half of mining hash rate could potentially reorganize recent blocks, censor transactions temporarily, or reverse its own payments under certain conditions. It could not use the attack alone to take coins protected by other users’ private keys or freely change Bitcoin’s consensus rules.