Cambridge Research Finds Nearly a Third of Ethereum Nodes Concentrated in the US, Raising Finality Risk
New data from Cambridge shows the world's largest smart contract network running on infrastructure clustered in a handful of Western countries, with meaningful consequences for the hundreds of millions of users who depend on it elsewhere.
A report published July 10 by the Cambridge Centre for Alternative Finance (CCAF) has found that approximately 31% of Ethereum's roughly 8,522 discoverable nodes are hosted in the United States, placing the network's node concentration within about 2.3 percentage points of a technical threshold that would halt the confirmation of transactions. The findings, part of the CCAF's Cambridge Blockchain Network Sustainability Index update titled "Ethereum After the Merge, A Change in Power," add a new layer of infrastructure risk data to a network that currently secures around $38.91 billion in decentralized finance (DeFi) activity, $314 billion in stablecoin circulation, and approximately $25 billion in tokenized real-world assets (RWAs) from issuers including JPMorgan, BlackRock, Fidelity, and UBS.
How close is too close
Ethereum uses a proof-of-stake consensus system that requires at least two-thirds of validator stake to attest to a checkpoint before any block is considered final and irreversible. The flip side of that rule is that if more than one-third of validator stake (33.3%) goes offline simultaneously, the network stops finalizing blocks entirely. Transactions continue to be processed probabilistically, but nothing becomes permanent until the supermajority is restored. Recovery can take days and triggers automatic financial penalties on offline validators through a mechanism called the inactivity leak. With US-hosted nodes accounting for 31% of the total, a single coordinated outage or regulatory action affecting American infrastructure would bring the network to within striking distance of that limit (subject to the caveat, addressed below, that node count and validator stake are not identical measures).
The concern does not stop at national borders. The CCAF data shows that Germany accounts for 16% of nodes, Finland 8%, and France 6%. Taken in aggregate, the European Union accounts for roughly 39% of Ethereum nodes across all member states. The top four countries together control roughly 62% of the network's node base. At the provider level, Amazon Web Services hosts approximately 28% of all Ethereum nodes, Hetzner hosts around 15.6%, and OVH is identified as a third major provider in the data.
Across all providers, 64% of nodes run in cloud or enterprise data centres, with only 36% on residential hardware.
This has happened before
The risk is not theoretical. In August 2022, Hetzner, now identified by CCAF as one of Ethereum's three largest node hosts, banned blockchain workloads from its platform. At the time, Hetzner hosted an estimated 10 to 16% of Ethereum nodes and approximately 40% of Solana validator stake. The Solana network lost more than 1,000 validators and roughly 20% of its total stake nearly overnight as operators scrambled to migrate. Analysts have argued that a parallel situation on Ethereum would carry far greater consequences given the volume of assets and financial infrastructure now sitting on top of the network.
A software-level near-miss followed in December 2025, when a bug in Prysm consensus client version 7.0.0 caused validator participation to drop to 74.7%, leaving the network approximately eight to nine percentage points from losing finality before the incident was resolved through runtime workarounds and emergency client updates.
On the same day the CCAF report was released, CoinDesk reported that an AI system had independently identified a separate validator bug requiring human review to verify, underscoring that validator resilience remains an active concern inside the protocol's development community.
Alexander Neumuller, research lead at the CCAF, described the distribution as "Western-centric without being concentrated in any single country," offering that characterization as a personal observation rather than a formal research finding. He also flagged a key visibility gap: "Nodes and validators do not map one-to-one, so no one knows exactly how many validators sit behind any node."
That caveat matters because the finality threshold is based on validator stake, not node count. The actual geographic distribution of staked ETH may differ from what node data alone suggests.
The consequences fall hardest elsewhere
For users outside the United States and Western Europe, the stakes are concrete. Ethereum serves as a settlement layer for cross-border remittances, DeFi access, and tokenized asset markets across South Asia and sub-Saharan Africa, regions that represent some of the network's fastest-growing user bases. Yet neither region registers meaningfully in the CCAF node data. A finality stall triggered by US regulatory action or a cloud provider policy change would freeze withdrawals from layer-2 bridges, disrupt stablecoin transfers, and halt rollup exits globally. The populations with the least ability to influence that outcome through political or legal channels are precisely those most exposed to the fallout.
The US Securities and Exchange Commission cited Ethereum's domestic node concentration in 2022 as partial grounds for asserting jurisdiction over the network, a legal argument the CCAF data now reinforces with updated figures. That jurisdictional claim stands as a prior regulatory assertion and has not been formally litigated or withdrawn; its current legal status may require additional review before it bears on compliance decisions.
What comes next
Several protocol upgrades on Ethereum's roadmap address parts of this problem directly. Distributed Validator Technology (DVT) splits validator keys across multiple geographic regions, limiting the damage any single jurisdiction can cause. EIP-7594, known as PeerDAS, would reduce bandwidth requirements for running a node, lowering barriers for operators in markets with constrained connectivity. Further down the roadmap, stateless verification could theoretically allow node operation on consumer hardware as minimal as a smartphone, requiring negligible local storage.
Early-stage efforts to build node capacity in Africa include the Ethereum Enugu 2025 Pop-up City event in Nigeria, which targeted infrastructure skills including node operation with a stated goal of building long-term node capacity on the continent. An Ethereum Research Village is being developed as a year-round successor hub to sustain that work.
India's government launched the Blockchain India Challenge in February 2026 and also operates the Centre of Excellence in Blockchain Technology under the National Informatics Centre, though those efforts have not yet produced measurable Ethereum node participation.
Until they do, the network's critical infrastructure will remain concentrated in the same handful of jurisdictions that hold the most regulatory leverage over it.