In March 2024, seabed movements off the coast of Ivory Coast damaged seven undersea internet cables, sparking a severe regional internet outage. Despite the disruption, the global Bitcoin network showed little evidence of disturbance. Only about five Bitcoin nodes were located in the affected area—just 0.03% of the network’s total. The change rate in Bitcoin nodes stayed below the typical 2.5% fluctuation band, with no significant disruption to either network consensus or Bitcoin’s price.
Bitcoin Proves Robust Against Undersea Cable Failures
A new study by Cambridge University, which reviewed eleven years of Bitcoin network data alongside sixty-eight verified undersea cable faults, found that such infrastructure incidents have historically triggered only minimal effects on the network. In research led by Wenbin Wu and Alexander Neumueller, the team analyzed eight million Bitcoin node observations, 658 undersea cables, and 385 cable failure events between 2014 and 2025. Only 68 of these failures coincided with confirmed network disruptions. In 87% of these cases, the change in node count remained below 5%. The average impact was a -1.5% change, with a median of -0.4%. The researchers also found no significant link between node outages and fluctuations in the price of Bitcoin.
Identifying Vulnerabilities: Hosts and Critical Internet Layers
The study breaks the Bitcoin network down into three tiers: submarine cables for physical connectivity, autonomous systems for routing, and the peer-to-peer Bitcoin protocol at the top. In a random cable failure scenario, disabling between 72% and 92% of all cables would be necessary to affect more than 10% of nodes. However, far greater impact could result from a targeted effort against hosting networks with dense node populations. The Cambridge model indicates that even a 5% capacity reduction in the largest autonomous system providers could sharply disrupt node connectivity. Leading providers include Hetzner, OVHcloud, Comcast, Amazon Web Services, and Google Cloud. As of March 2026, 63.1% of the 23,150 accessible nodes run via the Tor network, with the remainder hosted mainly by these key providers.
Tor Network Emerges as Key Resilience Layer
The composition of the Bitcoin network has undergone remarkable change in recent years. In 2014, almost none of the nodes ran over Tor, yet by 2021 the share had jumped to 23%, soaring to 52% by 2022 and reaching 63% in March 2026. This surge coincided with events such as Iran’s 2019 communications blackout, Myanmar’s 2021 coup, and the 2021 Chinese ban on Bitcoin mining. While Tor was originally favored for privacy, it now serves as a core layer of structural resilience for Bitcoin. Although the physical location of many nodes remains obscured, Tor itself operates via distributed servers—primarily in well-connected countries such as Germany, France, and the Netherlands.
By expanding the model to include a fourth layer that accounts for Tor relay infrastructure, the researchers found that thresholds for a critical shutdown are dramatically higher compared to traditional approaches. In other words, to seriously disrupt both the open internet and Tor simultaneously would demand a massive loss of connectivity infrastructure.
China’s Mining Ban Deepens Network Distribution
Bitcoin’s infrastructural resilience dropped to its lowest in 2021, when 74% of global mining power was concentrated in East Asia. After the Chinese mining ban in 2022, the network’s geographic distribution widened sharply, and Tor usage spiked. This shift significantly strengthened the overall durability of the Bitcoin ecosystem.
Cloud Providers and Policy Poses Greatest Threat
Although geopolitical anxieties over submarine cables persist, the real Achilles’ heel for Bitcoin’s network lies in the dominance of major cloud hosting providers. Disruptions or regulatory actions targeting services such as Amazon Web Services or Google Cloud could visibly shrink the accessible node population. Nevertheless, off-protocol services—such as the Blockstream satellite network and block relay networks—continue to bolster the Bitcoin network’s ability to adapt and resist such threats.
