Bitcoin network holds as cable cuts, ASN risks assessed

Bitcoin impact: minimal from random cable cuts, major from ASN targets

According to a Cambridge study published on arXiv, modeling of 11 years of Bitcoin network data (2014–2025) across 658 submarine cables and 68 verifiable cable fault events shows that random physical disruptions generally do little harm to node connectivity. The authors report that it would take a 72–92% loss of all inter-country cables in random-failure scenarios to disconnect more than 10% of nodes. By contrast, shutting off about 5–20% of routing capacity at dominant Autonomous Systems (ASNs) could trigger comparable fragmentation. These findings distinguish physical path diversity from dependency on concentrated hosting networks.

The report separates clearnet reachability from overall protocol liveness, indicating that nodes often re-route over remaining paths during sizable physical outages. It also notes that roughly 64% of nodes use the Tor overlay, which tends to raise failure thresholds, although relay bandwidth is concentrated in a handful of well-connected European hubs. That concentration could become a liability if those relays or jurisdictions are disrupted. This underscores that resilience depends on both path diversity and avoiding over-reliance on a few intermediaries.

The real chokepoint: dependence on top ASNs like Hetzner

A practical chokepoint emerges from the share of clearnet nodes hosted by a small set of large ASNs, including providers such as Hetzner, OVHcloud, Amazon Web Services, Comcast, and google cloud. If outages, legal orders, or coordinated shutdowns were to restrict traffic across those networks, the modeled loss of only single-digit to low-double-digit percentages of routing capacity could fragment connectivity far more than random cable breaks. The exposure is infrastructural rather than cryptographic, and it primarily affects visibility and peering rather than ledger integrity. In policy terms, this risk lives where private hosting markets and national rules meet internet routing realities.

One industry summary has stressed how concentrated this dependency has become. “a targeted takedown of the top five ASNs … could demolish 95% of the network’s clearnet routing capacity,” said Gate.com in coverage of the research (https://www.gate.com/tr/news/detail/19269586?utm_source=openai).

Physical chokepoints still matter as they can magnify routing pressure when cuts cluster. As reported by Ars Technica, Kentik’s Director of Internet Analysis Doug Madory has highlighted the Red Sea as a major convergence zone for Europe–Asia cables, where multi-cable incidents have produced noticeable slowdowns for cloud services and transit. The Bitcoin findings suggest such clusters are usually survivable for nodes, but a simultaneous loss of hosting routes at top ASNs would be a different order of risk.

What seven internet cables cut means for network routing today

When several submarine links fail at once, internet traffic generally shifts to surviving paths where available. Based on the study’s thresholds, seven random cuts would fall well short of the 72–92% inter-country loss needed to disconnect more than a tenth of nodes, aligning with contemporaneous reporting that Bitcoin traffic showed limited disruption during a seven-cable incident, as reported by Blocklist.co.kr (https://blocklist.co.kr/2026/03/08/seven-internet-cables-cut-at-once-bitcoin-s-real-chokepoint/amp/?utm_source=openai).

Accidents remain the predominant cause of faults, according to the International Cable Protection Committee, which cites anchors, fishing activity, and natural hazards for roughly 70–80% of breaks (https://www.thenationalnews.com/future/technology/2025/09/09/red-sea-internet-cables-cut-outage//?utm_source=openai). That context argues for redundancy, rapid repair arrangements, and recognition of cable systems and key ASNs as critical infrastructure, while planners also diversify hosting across jurisdictions and overlay networks. The study’s model-based results imply that multi-homing, broader geographic placement, and diversified Tor/VPN paths can raise failure thresholds, though outcomes will vary by region and incident profile.