31% of Ethereum Node Activity Runs in U.S., Cambridge Finds

Cambridge researchers found that about 31% of active Ethereum node activity originates in the United States. The study warns that losing roughly one-third of those nodes within a short period could prevent the network from finalizing new blocks temporarily.

The study measured computers running Ethereum software around the world. Those machines, called nodes, relay data, pass transactions and keep the peer-to-peer network connected. The researchers reported the largest single share of node activity in the U.S., but the data reflect node locations rather than the geographic distribution of staked ETH or individual validators.

Finality on Ethereum depends on validator participation. Under the proof-of-stake rules in place since 2022, the protocol requires signatures from at least two-thirds of validators on checkpoint messages before it treats blocks as irreversible. If about one-third of validators are offline, unreachable or prevented from signing, the protocol cannot reach finality until enough signing capacity returns or protocol mechanisms act to restore availability.

The study notes that nodes and validators perform different tasks. Nodes broadcast and store blocks and transactions. Validators propose and attest to blocks based on staked assets. The research does not directly measure stake concentration, but geographic clustering of nodes can align with where infrastructure providers, staking services and validators operate.

Researchers pointed to several causes that could remove many nodes at once: large regional power or internet outages, major network failures, natural disasters and targeted interference with hosting providers. The network resumes finalization once a sufficient number of validators are reachable and able to sign. Operators can restore service or move infrastructure to other regions to recover availability.

The report highlights the current distribution of node activity and recommends monitoring and diversifying where nodes and validator services run to reduce the risk of regional disruptions. The authors write, “Losing roughly one-third of nodes could be enough to pause finalization temporarily.” The study provides data on node distribution without assigning a measure of staked assets to specific locations.