Seven major participants in the bitcoin mining sector have formally joined the Stratum V2 Working Group, marking one of the clearest signals yet that the industry is moving toward a mining protocol designed to give miners more control over block construction. The newly announced members include Antpool, F2pool, Foundry, Spiderpool, Block Inc., MARA Foundation, and DMND, according to an announcement published on the Stratum V2 Working Group’s official site.
The development matters because Stratum sits at the heart of how miners communicate with mining pools. For years, the industry has relied on Stratum V1, a protocol introduced in 2012 that became the de facto standard for coordinating mining activity. But while widely adopted, Stratum V1 was never designed as a formal standard and has long been criticized for centralizing important decisions in the hands of pools, particularly the selection of transactions included in candidate blocks.
Why Stratum V2 Is Gaining Momentum
Stratum V2 was built to address several shortcomings in the original protocol. Under V1, pools generally retain full control over transaction selection, while communications are sent in plain text, exposing miners to risks such as hash rate hijacking and surveillance. By contrast, Stratum V2 introduces end-to-end authenticated encryption, a more efficient communication model, and a framework that can increase miner autonomy.
One of the most important technical additions is the Job Declaration subprotocol. This feature allows miners to build their own block templates instead of simply accepting templates assigned by pools. In practical terms, that means miners can gain more influence over which transactions are included in blocks, a shift with implications for decentralization, censorship resistance, and the broader balance of power in bitcoin mining.
The protocol also promises operational improvements. According to the report, Stratum V2 can reduce bandwidth usage by roughly 60% on the pool side and 70% on the miner side. Those savings are especially relevant for mining operations deployed in areas with limited or expensive connectivity, where communication efficiency can materially affect uptime and profitability.
Potential Profitability Gains
Supporters of Stratum V2 argue that the protocol is not only about governance and decentralization, but also about economics. Real-world tests conducted by Braiins suggest miners can achieve up to 7.4% higher profitability when running V2 natively. The gains are attributed to faster block template delivery, lower latency, and improved fee capture through more efficient transaction selection.
In the official statement, the working group said that keeping Stratum V2 as a public, vendor-neutral specification removes compatibility barriers and enables the ecosystem to focus on what matters most: efficiency, privacy, security, and miner autonomy. That framing is important. Rather than positioning V2 as a proprietary upgrade controlled by a single provider, backers are emphasizing interoperability and open-source collaboration as the foundation for adoption.
Antpool CEO Andy Zhou said the company is proud to support broader adoption of Stratum V2 and argued that alignment around an open, interoperable standard will help the sector collaborate on efficiency, security, and decentralization. Spiderpool CTO Kenway Wang added that miner-built templates are especially useful for operators working in bandwidth-constrained environments, where protocol design can have an outsized effect on performance.
Adoption Moves From Testing to Deployment
The latest announcement suggests the effort is moving beyond theory and into a more serious deployment phase. Braiins Pool and DMND are already running Stratum V2 in production. DMND, launched in 2025, was described as one of the earliest pools to offer fully miner-selected templates. Blitzpool is also running the protocol for individual miners, while the Stratum V2 Reference Implementation community pool continues testing.
The Stratum V2 Working Group itself was founded in 2022 by Braiins and Spiral, Block’s bitcoin-focused technology arm. Since then, it has operated as an independent open-source community working to refine and promote the protocol. With the addition of larger operators, the group says it is entering a new phase of accelerated development and deployment.
Notably, some major players had already signaled interest before the current announcement. Foundry, Luxor, and Antpool had previously made testing commitments or prepared infrastructure related to V2. The formal addition of seven major companies now gives the effort more visible institutional backing and strengthens the case that the migration is becoming operationally realistic rather than merely aspirational.
Why the Industry Impact Could Be Significant
The scale of the newly participating firms is a central part of the story. Together, the seven new additions represent tens of exahashes per second in combined hash rate. That matters because bitcoin mining remains highly concentrated: the report notes that roughly five pools currently control about 70% of global hash power, and by extension exercise substantial influence over block content.
If Stratum V2 becomes broadly available across those pools, the implications could extend beyond network efficiency. It could reshape the relationship between individual miners and pool operators by giving miners a larger role in block template selection. In an ecosystem where transaction inclusion has both economic and political importance, even incremental shifts in control can be meaningful.
At the same time, adoption will likely be uneven and depend on implementation decisions by each pool. For individual miners, the practical question is not whether V2 exists, but when their chosen pool enables access and how smoothly the transition can be managed. In that respect, the availability of translation proxies may prove crucial. These tools allow miners using Stratum V1 firmware to connect to V2 pools without requiring hardware replacement or firmware upgrades, substantially reducing the barrier to entry.
An Open Standard at a Strategic Moment
The timing of the move is also notable. As mining economics become more competitive and fee capture grows in importance, protocol-level efficiency gains are increasingly valuable. A standard that can reduce communication overhead, strengthen security, and improve transaction selection at the miner level offers a compelling combination of incentives for both large-scale and smaller operators.
More broadly, the endorsement of Stratum V2 by several major mining entities suggests that open standards remain strategically important in bitcoin’s infrastructure layer. The debate is no longer only about raw hash rate or machine efficiency; it is also about who controls the construction of blocks and how transparent, secure, and interoperable the underlying systems should be.
While the transition is still underway, the latest wave of support indicates that Stratum V2 is emerging as a serious candidate to replace the legacy mining communication standard. Whether that shift ultimately transforms miner autonomy on a large scale will depend on rollout speed, technical execution, and user uptake. But with some of the industry’s biggest names now aligned behind the effort, the path toward wider adoption appears more credible than at any point since the working group was founded.