The miners who secure Bitcoin's $1.3 trillion network just took a quiet step toward actually controlling what they mine.
The Summary
- Seven major mining operations — ANTPOOL, Block Inc, F2Pool, Foundry, Spiderpool, MARA Foundation, and DMND — joined the Stratum V2 working group, a protocol upgrade that shifts power from pool operators back to individual miners.
- Under current Stratum V1, miners must use block templates provided by pool operators, centralizing transaction selection and censorship risk at the pool level.
- Stratum V2 could enhance Bitcoin's decentralization, security, and miner profitability by letting miners choose which transactions to include, even while pooling computational power.
The Signal
Bitcoin mining has a quiet centralization problem. Most people focus on geographic concentration or hash rate distribution. The real chokepoint is simpler: pool operators decide what goes in blocks. Individual miners just run the numbers.
That matters because transaction selection is where censorship happens. A pool operator can exclude specific addresses, filter out certain transaction types, or bow to government pressure without miners knowing or consenting. Under Stratum V1, the protocol most pools still use, miners are computational wage workers. They contribute hash power but surrender editorial control.
"Individual miners must rely on block templates provided by the mining pool operator."
Stratum V2 flips this. Miners can construct their own block templates while still pooling rewards. The technical upgrade includes:
- Job negotiation protocol that lets miners propose their own transaction sets
- Binary encoding that reduces bandwidth by up to 90%
- Authentication and encryption, making pool connections harder to surveil or manipulate
The list of new working group members reads like a who's who of industrial-scale mining. ANTPOOL and Foundry alone account for roughly 40% of Bitcoin's hash rate. F2Pool has been mining since 2013. MARA is publicly traded on NASDAQ. Block Inc brings Jack Dorsey's capital and ideological commitment to decentralization.
Their participation signals this isn't a hobbyist side project. It's infrastructure work at the base layer. Stratum V2 has been in development for years, but adoption stalled because pools had little incentive to give up control. Now the biggest players are joining the working group, which means they're committing engineering time and political capital to make it standard.
The implications touch decentralization, security, and profitability. Decentralization becomes real when thousands of miners make independent transaction choices rather than deferring to seven pool operators. Security improves when there's no single point to pressure or compromise. Profitability increases because miners can optimize for fees, prioritize their own transactions, or run custom strategies without leaving their pool.
The Implication
Watch for Stratum V2 adoption timelines from these pools. Working group membership is a commitment, but actual deployment is the test. If even two of these seven deploy V2 as default in 2026, it changes the mining landscape. Individual miners gain leverage. Pool operators lose their monopoly on block construction. Bitcoin becomes harder to censor at the protocol level.
For anyone building on Bitcoin or holding it long-term, this matters more than hash rate charts. The network's neutrality depends on who controls transaction selection. Stratum V2 makes that control distributed by default.