An important academic study has deeply analyzed the performance of the Bitcoin network in the face of global network failures, revealing its surprising resilience while also pointing out potential vulnerabilities.
Ability to Withstand Random Global Network Interruptions
The core finding of the study indicates that the Bitcoin ecosystem demonstrates extraordinary persistence when faced with unexpected or random interruptions to the physical backbone of the internet. Researchers simulated scenarios of widespread failure of international submarine cables, which carry the vast majority of long-distance digital communications worldwide.
The simulation results showed that the Bitcoin network would only begin to fragment when 72% to 92% of existing submarine cables failed simultaneously, leading to over 10% of nodes being isolated. This fragmentation threshold highlights the network's strong resilience under accidental or non-directional conditions.
An audit analysis of 68 real cable failure events over the past decade found that nearly 90% of incidents affected less than 5% of Bitcoin nodes. For instance, in 2024, although the breakage of several cables off the coast of West Africa caused severe regional disruptions, the global network of Bitcoin nodes remained stable overall.
Directed Attacks and Critical Infrastructure Risks
Unlike random failures, directed threats pose a more insidious risk to the network. Researchers examined the potential consequences of deliberately attacking submarine cables classified as having a “high node degree” (i.e., nodes critical to international data routing).
Their modeling found that damaging just 20% of these strategically significant cables could have an impact comparable to randomly damaging nearly all cables globally. This indicates that targeted infrastructure manipulation can have a disproportionate effect compared to widespread but arbitrary failures.
Another potential vulnerability lies in hosting centralization. Major internet service providers and large cloud companies such as Hetzner, Amazon, Comcast, OVH, and Google Cloud host a significant number of publicly accessible Bitcoin nodes. The study determined that even a 5% loss of routing capacity in these dominant networks could lead to significant connectivity issues for the entire system.
Another key trend in network resilience is reflected in the use of the Tor network. Analysis records show that by 2025, the proportion of Bitcoin nodes accessible via Tor has exceeded 60%, a significant increase from the few available in the early 2010s. Tor provides alternative communication channels, enhancing redundancy and allowing the network to reroute data when traditional internet routing fails, with many Tor relay nodes located in European countries with robust fiber infrastructure.
According to published analyses, “Bitcoin can withstand large-scale random cable failures. However, attacking key hosting providers may disrupt the network with minimal infrastructure damage.”