The bitcoin mining industry is sending one of its strongest signals yet that a long-discussed protocol transition is moving closer to reality. According to an announcement published on the official Stratum V2 Working Group website, seven major companies — Antpool, F2pool, Foundry, Spiderpool, Block Inc., MARA Foundation and DMND — formally joined the group on May 7, 2026. Their participation suggests that Stratum V2 is advancing from a development and testing effort into a broader industry deployment phase.
A larger coalition forms around an open mining standard
Stratum V2 is designed to replace Stratum V1, the mining communication protocol introduced in 2012 by Marek “Slush” Palatinus. While V1 became the industry default, it was never created as a formal standard and left meaningful power concentrated in mining pools. Under that model, pools retained near-total control over transaction selection and block template construction, while miners typically accepted the work assigned to them. The older protocol also relied on plaintext communication, exposing participants to risks such as hashrate hijacking and surveillance.
The newer protocol aims to address those weaknesses directly. Stratum V2 uses authenticated end-to-end encryption and improves data transmission efficiency across the mining stack. The figures cited in the announcement are notable: bandwidth usage can be reduced by roughly 60% on the pool side and 70% for miners. In an industry where latency, communication overhead and operational reliability directly affect revenue, those efficiency gains are not just technical upgrades — they can alter competitiveness.
Perhaps the most consequential change is the inclusion of the Job Declaration subprotocol. This feature allows miners to create their own block templates rather than relying exclusively on templates built by pools. That shift touches one of the most debated structural issues in bitcoin mining: who decides which transactions enter a block. Under Stratum V1, pools effectively held that authority. Under Stratum V2, miners gain a path toward meaningful transaction-selection autonomy.
Efficiency and profitability are central to the push
The official statement argues that keeping Stratum V2 as a public, vendor-independent specification removes compatibility barriers and allows the ecosystem to focus on what matters most: improving efficiency, privacy, security and miner autonomy, with the end result of greater profitability. That framing is important because protocol upgrades in mining are often judged less by ideology and more by operational economics.
Braiins, one of the key organizations behind the initiative, says real-world testing indicates that miners can achieve up to 7.4% higher profitability when running Stratum V2 natively. The cited reasons include faster template delivery, lower latency and better fee capture through improved transaction selection. In a business defined by tight margins, volatile hashprice and rising infrastructure costs, a gain of that size is large enough to attract serious attention from both industrial and independent operators.
Industry executives quoted in the report also framed the transition as more than a software update. Antpool CEO Andy Zhou said the company is proud to support broader adoption of Stratum V2, adding that alignment around an open and interoperable standard gives the sector a foundation for collaboration on efficiency, security and decentralization. Spiderpool CTO Kenway Wang emphasized the practical value of miner-built templates, especially for operators working in bandwidth-constrained environments.
From experiments to production deployment
The ecosystem is no longer operating purely at the proof-of-concept stage. Braiins Pool and DMND are already running Stratum V2 in production, according to the report. DMND, launched in 2025, is described as one of the earliest pools to offer fully miner-selected templates. Blitzpool is also running the protocol for individual miners, while the community pool tied to the Stratum V2 Reference Implementation continues testing. Together, these deployments show that the protocol is moving beyond white papers and working-group discussions into active mining operations.
The Stratum V2 Working Group itself was founded in 2022 by Braiins and Spiral, Block’s bitcoin-focused technology arm. After more than four years as an independent open-source community, the group now says it is entering “a new phase of accelerated development and deployment.” The addition of large-scale operators gives that statement more weight, because adoption in bitcoin mining often depends on support from a relatively small set of dominant pools and infrastructure providers.
The report notes that Foundry, Luxor and Antpool had already made testing commitments or prepared infrastructure before this latest announcement. That matters because protocol transitions in mining tend to be gradual. Operators need compatibility, stability and confidence that software changes will not interrupt revenue-generating activity. Early infrastructure preparation suggests some major players were already planning for eventual integration.
Why this matters for mining centralization
The strategic importance of Stratum V2 becomes clearer when viewed against today’s concentration of hashpower. The article says that roughly five pools control about 70% of global bitcoin hashpower, and therefore influence most of the content included in newly mined blocks. Even if the miners physically running machines are widely distributed, decision-making over transaction inclusion has remained concentrated at the pool level.
If Stratum V2 adoption expands, that balance could begin to shift. The seven newly participating organizations reportedly represent tens of exahashes per second in combined hashrate. While joining the working group does not mean every connected miner instantly gains full template autonomy, it does indicate that some of the largest institutions in the sector are now publicly aligned with a protocol that can reduce pool dominance over block construction.
That does not automatically solve mining centralization. Pool concentration is driven by many forces, including payout reliability, financial products, geographic distribution, credit relationships and operational scale. But protocol design still matters. By allowing miners greater control over transaction selection, improving communication security and reducing infrastructure friction, Stratum V2 could change incentives at the margins in ways that make the mining system more resilient.
Adoption still depends on access and implementation
For individual miners, the practical question is not whether Stratum V2 exists, but when major pools will enable user access. Formal support from the largest operators is a meaningful milestone, yet deployment across real mining fleets takes time. Firmware compatibility, software tooling, routing policies and operational support all affect how quickly users can migrate.
One factor that may accelerate adoption is the availability of translation proxies. These tools already allow Stratum V1 firmware to connect to V2 pools without requiring hardware or firmware upgrades. That lowers the barrier to entry significantly, especially for miners that cannot afford a broad hardware refresh or for facilities managing mixed machine fleets. In other words, the transition path does not require the industry to rebuild itself from scratch.
What emerges from this latest announcement is a clearer picture of momentum. Stratum V2 is no longer just an aspirational standard championed by developers and a handful of early adopters. With Foundry, Antpool, F2pool and other major names entering the working group, the protocol now has visible backing from companies that shape a substantial share of global bitcoin mining activity. Whether the shift happens quickly or gradually, the debate over who controls bitcoin block templates is moving from theory to implementation.