The hidden reality of Bitcoin mining control

The illusion of independent pools

I see a massive gap between reported mining pool data and the actual concentration of block production. While Foundry USA holds roughly 34.2% of the network hashrate, the true dominance of single entities remains hidden by proxy networks. Research by developer 0xb10c and Matt Corallo shows that AntPool functions as a pool of pools, using proxies like Binance Pool, Poolin, and EMCD to control block templates. This arrangement pushes AntPool’s effective control over block template construction to between 37% and 50% of the total network hashrate. When you consider that the top six pools control over 95% of all blocks, the Nakamoto Coefficient of just three pools becomes a glaring vulnerability for a system whose security model assumes no single coalition controls block production. This concentration allows a small coalition to dictate which transactions enter blocks, which undermines the censorship resistance that makes Bitcoin valuable. F2Pool demonstrated this risk when researchers detected transactions from OFAC-sanctioned addresses being excluded from its blocks in January 2025. The 2024 halving, which reduced the block reward to 3.125 BTC, accelerated this consolidation because smaller pools could no longer offer competitive fee structures. Even empty blocks show this divide, as OCEAN mines empty blocks at 17.5x the network average because its DATUM protocol adds latency. The threat of a 51% attack remains credible because AntPool’s proxy network brings its control closer to the 51% threshold. A pool with 33% hashrate could also profitably engage in selfish mining as network advantages shift.

Hardware supply chain bottlenecks

Bitmain dominates the physical layer of Bitcoin security, controlling an estimated 50% to 65% of the global ASIC miner market. This hardware concentration creates a single point of failure because Bitmain relies exclusively on TSMC for its advanced chip fabrication, creating immense risk if geopolitical conflict disrupts the supply of silicon. I find the efficiency of the current flagship hardware impressive, but the industry remains an oligopoly of Bitmain, MicroBT, and Canaan. The Antminer S21 XP uses the BM1370 chip to deliver 270 TH/s at 13.5 J/TH. This machine provides a 10% efficiency improvement over the S21 Pro’s 15.0 J/TH.

You should look at the efficiency gap before buying old hardware. The S21 Pro produces 234 TH/s and costs significantly less, but the XP provides more raw power for the same electrical footprint. US miners imported $860 million in equipment in Q1 2025 to avoid tariffs that pushed ASIC mining rates above 21%. At a hashprice of $49.00 per PH/day, the S21 XP remains profitable even at electricity costs of $0.151/kWh, while the S21 Pro reaches its breakeven point much sooner.

Regulatory shifts and protocol upgrades

Geographic migration and protocol changes attempt to correct these imbalances. Kazakhstan removed the mandatory 75% asset sale rule in 2025, which gave local miners freedom to choose their own international buyers. This shift follows the massive migration of miners from China to the US and Kazakhstan after the 2021 crackdown. I notice that Stratum V2 provides a real path toward miner sovereignty by allowing individual miners to build their own block templates through Job Declaration. Seven major pools, including Foundry USA and AntPool, now support this standard, and these signatories hold close to 75% of the total hashrate. OCEAN and DEMAND also lead this charge with the DATUM protocol and SLICE payout system. Russia also introduced a proposal to ban mining in Moscow and parts of the Kursk Region through 2032. In the US, public listed miners sold more than 32,000 BTC in Q1 2026 to cover operating expenses. Will these protocol-level changes prevent the eventual consolidation of hashrate into a few massive, regulated entities?