TL;DR
Seven leading Bitcoin mining pools, representing about 75% of the global hashrate, have joined the Stratum V2 working group, adopting an open protocol that shifts block construction decisions to individual miners. This move aims to enhance decentralization and transparency in Bitcoin mining.
Seven of the largest Bitcoin mining pools, including Foundry, AntPool, F2Pool, SpiderPool, MARA Pool, Block Inc, and DMND, have joined the Stratum V2 working group, collectively controlling nearly 75% of the global Bitcoin hashrate. This development marks a significant shift towards decentralization in Bitcoin mining by adopting an open-source protocol that gives individual miners more control over block construction decisions.
The Stratum V2 protocol, introduced in 2022, allows individual miners to construct their own block templates, deciding which transactions to include, rather than leaving these decisions solely to pool operators. Foundry alone accounts for 34.2% of the global hashrate, AntPool 14.2%, F2Pool 11.3%, and SpiderPool 10.5%, with MARA Pool contributing 4.7%, according to Hashrate Index data. The seven pools’ support for Stratum V2 now encompasses nearly 75% of Bitcoin’s total hashrate, marking a major step toward broader adoption.
Previously, the dominant Stratum V1 protocol centralized transaction selection within pools, raising concerns about mining centralization and potential manipulation. The move to Stratum V2 does not alter the distribution of hashrate but shifts control over transaction inclusion, addressing community worries about concentration risks associated with large pools controlling more than 30% of the network’s hashrate.
Why It Matters
This development is significant because it represents the largest collective move by major miners toward decentralization in recent years. By enabling individual miners to influence block content directly, it could reduce the risk of transaction censorship and increase transparency within the network. Although it does not reduce the overall concentration of hashrate, it changes the decision-making process, which could have long-term implications for network security and governance.
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Background
The adoption of Stratum V2 by these pools comes amid ongoing concerns about mining centralization and the potential risks it poses to Bitcoin’s decentralization ethos. Prior to this, the protocol had limited adoption and was considered a niche project. The move by Foundry and AntPool, two of the largest pools, signals a new phase of deployment aimed at addressing these concerns as the mining industry faces profitability pressures, with up to 20% of miners estimated to be unprofitable and difficulty levels set to rise again on May 15, 2026.
“The support from these major pools for Stratum V2 is a pivotal step toward decentralizing decision-making in Bitcoin mining, but the real impact will depend on how quickly and widely the protocol is adopted across smaller pools.”
— Bitcoin Mining Industry Analyst
“Joining the Stratum V2 working group reflects our commitment to transparency and decentralization in Bitcoin mining.”
— Foundry spokesperson
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What Remains Unclear
It remains unclear how quickly other pools, especially smaller ones, will adopt Stratum V2, or whether this move will significantly alter the network’s decentralization in practice. The impact on transaction censorship or manipulation remains a subject of debate, as the protocol shifts decision-making but does not change the distribution of hashrate itself.
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What’s Next
Next steps include monitoring the rate of adoption among smaller pools and individual miners, as well as observing any technical or governance challenges that may arise. Further developments could involve broader industry consensus on decentralization measures or potential protocol upgrades to address remaining centralization concerns.
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Key Questions
What is Stratum V2?
Stratum V2 is an open-source protocol that governs how mining pools communicate with individual miners, allowing miners to construct their own block templates and decide transaction inclusion.
Why is this move significant?
It marks the largest collective effort by major pools to promote decentralization by shifting control over block content from pool operators to individual miners, potentially reducing centralization risks.
Does this reduce the overall concentration of Bitcoin’s hashrate?
No, it does not change the distribution of hashrate but alters who makes decisions about transaction inclusion in blocks.
Will smaller pools adopt Stratum V2?
The rate of adoption among smaller pools remains uncertain, and it is unclear how quickly the protocol will be widely implemented across the industry.
What are the potential risks or drawbacks?
Potential challenges include technical integration issues, resistance from pools preferring centralized control, and whether the protocol can effectively address decentralization concerns in practice.
