Analysis: With ~42.6% of Bitcoin Hashrate in the U.S., the Real Fight Is Over Mining Pool Control

On June 14, 2026, renewed discussion around Bitcoin’s decentralization surfaced after estimates suggested that roughly 42.5%–42.6% of global Bitcoin hashrate is now concentrated in the United States. The headline number is attention-grabbing, but the deeper question for censorship resistance is not where the machines are—it's who controls block construction.

Bitcoin was designed to be resilient under hostile conditions. Yet in 2026, the network’s security budget, public-company mining scale, and the dominance of a handful of mining pools have shifted the decentralization debate from pure geography to infrastructure governance—especially the transaction selection power embedded in today’s pool-centric workflow.

1) The U.S. hashrate number is a signal, not a verdict

Hashrate by country is notoriously difficult to measure with precision. Depending on methodology (pool data, IP/geolocation heuristics, ASIC shipment flows, self-reported surveys), the U.S. share can look meaningfully different across datasets.

For example, Hashrate Index’s Q1 2026 heatmap places the United States at ~37.5% of global hashrate (about 400 EH/s at the time of the report), still the largest single jurisdiction by a wide margin. You can see the breakdown in the Global Hashrate Heatmap Update (Q1 2026) from Hashrate Index here.

So how do we reconcile “~37%” with “~42%”? In practice, the higher figure usually reflects broader influence estimates (e.g., combining direct U.S.-based operations with U.S.-linked corporate capacity, hosting, or pool routing), and short observation windows can amplify volatility. The point is not that one number is “right” and another is “wrong”—it’s that a rising U.S. share is a trend indicator worth monitoring, not a final conclusion about Bitcoin’s neutrality.

Why the U.S. keeps attracting miners

Several factors continue to pull industrial miners toward the United States:

• Grid-scale power markets and demand response, especially in energy-rich states
• Institutional financing, which lowered cost of capital for large operators
• Large hosting ecosystems that make expansion faster than greenfield builds

The U.S. government has also become more active in measuring mining’s footprint. The U.S. Energy Information Administration (EIA) outlined multiple approaches to estimate crypto-mining electricity usage and documented a growing set of identified facilities across U.S. states in its analysis here.

2) Public companies now represent a major slice of global hashrate

A key 2025–2026 shift is that Bitcoin mining is no longer dominated only by private operators. Publicly traded miners—especially U.S.-listed ones—have scaled into a large fraction of the network.

In mid-2025, JPMorgan coverage reported that 13 U.S.-listed miners accounted for ~31.5% of global network hashrate, a record at the time. CoinDesk summarized that JPMorgan note here.

This matters because public companies introduce a different risk profile:

• Governance and compliance pressure (boards, auditors, banking relationships)
• Operational transparency (disclosures can reveal concentration patterns faster)
• Capital-market reflexivity (hashrate growth and treasury strategy can be driven by equity cycles)

None of this automatically reduces Bitcoin’s censorship resistance—but it does mean network security is increasingly shaped by corporate incentives as well as pure mining economics.

3) The bigger structural risk: Mining pool concentration and block template control

Even if hashrate were perfectly geographically distributed, Bitcoin can still face censorship pressure if a small number of mining pools coordinate transaction selection.

Pools don’t just pay miners—they shape blocks

Under the dominant Stratum V1 model, pools typically provide miners with work based on a block template constructed upstream. In simple terms: if the entity building the template can decide what transactions enter the candidate block, then transaction inclusion becomes editorial.

This is why pool dominance is often more consequential than country dominance.

In 2026, a few pools can influence most blocks

A May 2026 CoinDesk report noted that several major pools collectively represent close to ~75% of global hashrate and highlighted the central concern: under Stratum V1, transaction selection tends to sit with pool operators rather than individual miners. That report is available here.

The same report also cited pool shares where Foundry alone was above 30% in the observed period—illustrating why “single pool near one-third” headlines keep returning.

Why “pool share” is not identical to “ownership”—but still matters

It’s true that miners can redirect hashrate between pools relatively quickly, which limits the permanence of pool dominance. However, while miners remain pointed at a pool, that pool’s policies can become a default rule-set for a large fraction of blocks—especially when the top few pools together exceed two-thirds of production.

So the risk isn’t that one company “owns Bitcoin,” but that transaction filtering could become operationally easy if:

• compliant filtering becomes standardized,
• miners prioritize payout stability over policy independence,
• and block building remains centralized at the pool layer.

4) Bitcoin has survived major hashrate shocks before (and adapted fast)

The censorship-resistance debate often forgets Bitcoin’s demonstrated ability to survive sudden mining dislocations.

When China’s mining crackdown accelerated in 2021, hashrate fell sharply and then rebalanced across jurisdictions. Cambridge’s research on the timeline and data-driven view of China’s mining exodus is a strong reference point here.

The key lesson: hashrate is mobile—not instantly, but fast enough that attempts at long-term national control face real physical and economic constraints. The network’s difficulty adjustment mechanism also helps stabilize security after shocks, preventing temporary disruptions from becoming permanent failures.

5) Why sustained “systemic censorship” is harder than it looks

Even if a majority of hashrate sits in one country, censorship still has to fight Bitcoin’s incentive design:

• Miners are paid to maximize revenue, which includes transaction fees. Excluding fee-paying transactions is costly unless someone compensates miners for the loss.
• Hashrate can move (across pools quickly, and across borders more slowly) if policy risk becomes expensive.
• Competing pools can market “neutral block building” as a differentiator, especially as fee revenue becomes more important post-halving.

That said, short-lived censorship episodes—especially around specific sanctioned entities—could still occur under certain conditions. The practical risk is often less “Bitcoin stops working” and more “some transactions take longer, become more expensive, or require better fee strategy.”

6) The most promising mitigation: Stratum V2 and miner-led transaction selection

The good news is that the industry is actively working on the specific bottleneck: who gets to choose transactions.

What Stratum V2 changes

Stratum V2 introduces optional mechanisms that can allow individual miners (or downstream operators) to build their own block templates, reducing the pool’s control over transaction selection.

The Stratum V2 team’s explanation of Job Negotiation—the component most directly tied to “miner chooses transactions”—is described here. For a more formal view of how roles and message flows fit together, the Protocol Overview is available here.

Why this matters in 2026 specifically

Post-2024 halving economics pushed miners to care more about fee optimization. If miners increasingly compete on fee capture, they have more reason to adopt architectures where they can:

• source transactions from their own mempool policy,
• avoid one-size-fits-all pool filtering,
• and reduce reliance on a small set of template builders.

The May 2026 CoinDesk report also framed recent momentum around open block construction standards and Stratum V2 adoption as one of the most meaningful mining decentralization shifts in years here.

7) Practical takeaways for users: Decentralization is something you can participate in

Mining centralization debates can feel distant if you’re not running ASICs. But censorship resistance is a full-stack property—users matter too:

• Run your own Bitcoin node (or use infrastructure that does), so your wallet verifies consensus rules independently.
• Use self-custody so your ability to transact doesn’t depend on an intermediary’s policy decisions.
• Understand fee dynamics so you can react if inclusion becomes more selective (e.g., during spikes in mempool congestion).

If you’re focused on self-custody as a defense against institutional choke points, a hardware wallet can help keep private keys offline. OneKey’s design philosophy centers on verifiable security and a smoother self-custody experience, which fits naturally with the broader goal of keeping Bitcoin usage more resistant to external control—especially when combined with your own node and good transaction hygiene.

Conclusion: Watch the pool layer, not just the map

A U.S. hashrate share approaching the low-40% range should be treated as a trend signal—a reminder that Bitcoin mining has industrialized and consolidated in visible jurisdictions. But the network’s real censorship-resistance battleground is increasingly mining pool block construction, where transaction selection power can become concentrated even if miners are globally distributed.

The next phase of decentralization likely won’t come from a single country losing share overnight—it will come from protocol and infrastructure upgrades (like Stratum V2 Job Negotiation) that push transaction choice back downstream, aligning Bitcoin’s incentives with its original anti-censorship design.