TokenAnalyst: five mining entities - AntPool, BTC.com, BTC.top, F2 Pool, and ViaBTC, all based in China, control 49.9% of Bitcoin network's computing power
Olga Kharif / Bloomberg : Tweets: @digieconomist , @el33th4xor , @alistairmilne , and @bitcoin Tweets: Digiconomist / @digieconomist : In the meanwhile this PoW thing is turning in the most environmentally damaging centralized database https://twitter.com/... Emin Gün Sirer / @el33th4xor : One way to look at PoW is to view it as an extortion racket by miners where you have to pay an ever more centralizing set increasing amounts to not attack you. https://www.bloomberg.com/... Alistair Milne / @alistairmilne : Bitcoin up, release the FUD https://twitter.com/... @bitcoin : Concern trolling by Bloomberg. Mining pools = aggregate hashing power of many individually owned miners. https://twitter.com/...
Context & Ripple Effects
TokenAnalyst's finding that five China-based pools — AntPool, BTC.com, BTC.top, F2 Pool and ViaBTC — sit just shy of half the network put a number on the proof-of-work centralization critique Emin Gün Sirer voiced in response, while Alistair Milne dismissed the reaction as FUD. The measurement mattered because a majority share would give those pools practical leverage over transaction ordering.
The later coverage shows how the concentration question evolved rather than disappeared: a study found ~50 miners still controlled 50% of mining capacity by late 2021, while geography shifted as China cracked down on domestic mining, pushing hashrate toward hubs like Kazakhstan, whose internet outage briefly knocked out an estimated 15% of global miners.
First-order effects
- Bitcoin users and exchanges face renewed counterparty-style risk assessment of the five named pools, since a coordinated majority could censor or reorder transactions; the pools' own reputations become part of the network's security story.
- Digiconomist and other critics gain a concrete data point linking proof-of-work to both centralization and environmental cost, sharpening the public argument against PoW at exactly the moment its defenders call the concern overblown.
Second-order effects
- Concentration in one country turns out to be a single point of failure: when Chinese authorities crack down on mining, the same dominance flagged in 2020 unwinds rapidly, redistributing hashrate to Kazakhstan and North America and forcing pool operators to diversify their physical footprint.
- Energy-intensive relocation draws regulators in — New York weighs a three-year moratorium bill after a fossil-fuel plant restarts to mine crypto, making miners' siting decisions a policy issue rather than a private one.
Third-order effects
- If the pattern holds, Bitcoin's security model splits into two concentrations — a few dozen dominant miners per the 2021 study, and a handful of jurisdictions hosting them — so decentralization claims rest increasingly on geographic spread rather than participant count.
- Proof-of-work networks face a durable legitimacy gap: each centralization measurement and each regulatory response gives policymakers a template for treating mining infrastructure like any other critical, licensable industry.
The trend: Bitcoin mining is consolidating into fewer large operators even as it disperses across jurisdictions, with each concentration measurement feeding a growing regulatory and environmental backlash against proof-of-work.