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Seven of the largest Bitcoin mining pools, representing about 75% of global hashrate, have committed to adopting the open-source Stratum V2 protocol. This shift allows individual miners to determine which transactions are included in blocks, potentially decentralizing transaction decision-making.
Seven of the largest Bitcoin mining pools, controlling nearly three-quarters of the global hashrate, have announced their support for the open-source Stratum V2 protocol, marking a major step in the decentralization of transaction selection in Bitcoin mining.
The pools—Foundry, AntPool, F2Pool, SpiderPool, MARA Pool, Block Inc, and DMND—joined the Stratum V2 working group, which was established in 2022 to develop a protocol that shifts control of block transaction decisions from pool operators to individual miners. Foundry alone accounts for 34.2% of the global hashrate, with AntPool at 14.2%, F2Pool at 11.3%, and SpiderPool at 10.5%, according to Hashrate Index data. Together, these pools represent approximately 75% of Bitcoin’s total hashrate.
Under the current Stratum V1 protocol, pool operators decide which transactions to include in each block, a process that has raised concerns about centralization and potential manipulation. Stratum V2 allows individual miners to construct their own block templates, giving them control over transaction selection. This change does not alter the overall distribution of hashrate but shifts decision-making power, addressing longstanding community concerns about concentration of influence.
Why It Matters
This development is significant because it addresses core issues of decentralization within Bitcoin mining. By empowering individual miners, the move could reduce the risk of large pools exerting undue influence over transaction ordering, which has implications for network censorship resistance and trust. The adoption by pools controlling most of the network’s hashrate signals a potential shift toward more distributed control, though the actual impact remains to be seen.
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Background
The move follows years of debate over the centralization risks posed by large mining pools. Although the protocol has existed since 2022, adoption was limited until now. The recent joining of major pools reflects a broader industry recognition of the importance of decentralization and transparency in Bitcoin’s consensus process. The timing coincides with ongoing economic pressures on miners, with estimates suggesting up to 20% are currently unprofitable and network difficulty expected to rise again on May 15, 2026.
“The support from these major pools marks a pivotal step towards a more decentralized and resilient Bitcoin network.”
— Bitcoin Mining Association spokesperson
“Adopting Stratum V2 aligns with our commitment to transparency and decentralization in Bitcoin mining.”
— F2Pool representative
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What Remains Unclear
It remains unclear how quickly and widely other pools will adopt Stratum V2, and whether this shift will significantly alter the network’s decentralization in practice. Additionally, the community continues to debate whether changing who decides transaction inclusion addresses the core centralization concerns or merely shifts influence among miners.
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What’s Next
Next steps include monitoring the adoption rate of Stratum V2 among smaller pools and individual miners, as well as observing any impacts on network decentralization and transaction censorship resistance. Further updates from the working group and industry stakeholders are expected as deployment progresses.
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Key Questions
What is Stratum V2?
Stratum V2 is an open-source protocol that allows individual miners to construct their own block templates, shifting transaction selection authority from pool operators to miners.
Why is this move significant?
It addresses longstanding concerns about centralization in Bitcoin mining by decentralizing transaction decision-making, which could improve network resilience and trustworthiness.
Will all mining pools adopt Stratum V2?
It is not yet clear how quickly or broadly other pools will adopt the protocol. The current support from major pools is a notable first step.
Does this change reduce the overall hashrate concentration?
No, it does not alter the distribution of hashrate but shifts control over transaction inclusion, which is a different aspect of decentralization.
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