TL;DR
Seven leading Bitcoin mining pools, including Foundry and AntPool, representing about 75% of the network’s hashrate, have joined the Stratum V2 protocol. This shift allows individual miners to control transaction inclusion, potentially increasing decentralization. The move marks a significant development in Bitcoin mining governance.
Seven of the largest Bitcoin mining pools, controlling nearly 75% of the network’s hashrate, have joined the Stratum V2 working group, supporting an open standard that shifts transaction decision-making power to individual miners. This development is a notable step toward decentralizing Bitcoin’s mining infrastructure and reducing transaction concentration risks.
The pools involved include Foundry, AntPool, F2Pool, SpiderPool, MARA Pool, Block Inc, and DMND, all of which have committed to adopting the Stratum V2 protocol. Foundry alone accounts for 34.2% of global Bitcoin hashrate, with AntPool at 14.2%, F2Pool at 11.3%, and SpiderPool at 10.5%, according to Hashrate Index data. Collectively, these pools represent nearly three-quarters of the total network hashrate.
Stratum V2 is an open-source protocol that enables individual miners within pools to construct their own block templates, determining which transactions are included in each block. Under the current Stratum V1 standard, transaction selection is centralized with pool operators, which has raised concerns about transaction and hashrate concentration. The new standard aims to address these issues without altering the overall distribution of hashrate.
Why It Matters
This move is significant because it addresses ongoing concerns about centralization in Bitcoin mining, particularly the risks associated with large pools controlling transaction ordering. By empowering individual miners, the protocol could enhance the network’s decentralization and resilience. The support from pools controlling a majority of the network’s hashrate signals a potential shift toward more distributed decision-making in Bitcoin mining.

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Background
Since its inception in 2022, the Stratum V2 protocol has been a niche project, with limited adoption. The recent joining of major pools marks a turning point, as the protocol now reaches a substantial portion of the global hashrate. The development comes amid ongoing industry debates about mining centralization, especially as profitability declines and difficulty rises, with about 20% of miners reportedly unprofitable, according to CoinShares. The network’s hashrate currently sits near 998 exahash per second, with difficulty expected to increase again on May 15.
“This support from major pools marks the beginning of a new phase of deployment, emphasizing decentralization and miner empowerment.”
— a spokesperson for the Stratum V2 working group
“Joining the standard aligns with our commitment to a more decentralized and resilient Bitcoin network.”
— a representative from Foundry

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What Remains Unclear
It is still unclear how quickly these pools will fully implement Stratum V2 and how individual miners will respond to the change. The overall impact on transaction ordering, network decentralization, and potential resistance from pools or miners remains to be seen. Further technical and industry assessments are expected in the coming months.

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What’s Next
Next steps include the technical rollout of Stratum V2 by the participating pools and monitoring its adoption rate among miners. Industry observers will watch for changes in transaction inclusion practices and any shifts in mining centralization metrics. Additional pools may join the standard in the future, further expanding its reach.

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Key Questions
What is the significance of the pools joining the Stratum V2 protocol?
The move signals a potential shift toward decentralizing transaction decision-making within Bitcoin mining, reducing risks associated with large pools controlling transaction ordering.
Will this change how Bitcoin blocks are mined?
It will not change the overall distribution of hashrate but allows individual miners to decide which transactions to include, potentially increasing decentralization.
When will the pools fully adopt Stratum V2?
The timeline for full implementation is still uncertain; technical rollout and industry adaptation are ongoing processes.
Does this move reduce the risk of mining centralization?
It could, by giving individual miners more control over transaction inclusion, but the overall impact depends on broader industry adoption and miner behavior.