A recent academic analysis has shed new light on Bitcoin’s ability to remain operational even when significant portions of global internet infrastructure fail. The research, conducted by the Cambridge Centre for Alternative Finance, delved into over a decade of historical data and network events to assess the world’s first cryptocurrency’s robustness against large-scale physical disruptions. The centre is an interdisciplinary research platform at the University of Cambridge that specializes in alternative finance, digital assets, and blockchain studies.
Resilience To Random Global Cable Failures
The study’s central finding points to remarkable durability within the Bitcoin ecosystem when faced with unexpected or random outages in the internet’s physical backbone. Researchers modeled scenarios in which enormous portions of international submarine cables, responsible for carrying the majority of the world’s long-distance digital communications, were rendered inoperative.
Simulations indicated that only if 72% to 92% of all existing submarine cables were to fail at the same time would the Bitcoin network begin to fragment in ways that disconnect over 10% of all its nodes. This fragmentation threshold highlights network resilience under accidental or non-targeted conditions.
An audit covering sixty-eight real incidents of cable faults from the prior decade revealed that nearly nine out of ten events resulted in less than five percent of Bitcoin nodes being affected. For instance, when several cables were severed off the coast of West Africa in 2024, regional disruptions were significant, but Bitcoin’s global node network as a whole maintained stable performance.
Targeted Disruptions And Critical Infrastructure Risks
In contrast to random failures, targeted threats present more subtle risks for the network. The researchers examined what could happen if someone deliberately attacked specific submarine cables classified as “high-betweenness”—those critical to international data routing.
Their modeling found that by disabling just 20% of these strategically important cables, the resulting impact would rival that of randomly disabling nearly all global cables. This demonstrates the outsized effect of targeted infrastructure manipulation compared to widespread but arbitrary malfunctions.
A further area of vulnerability centers on hosting concentration. Major internet service providers and large cloud companies such as Hetzner, Amazon, Comcast, OVH, and Google Cloud host a substantial share of Bitcoin’s publicly reachable nodes. The study determined that removing as little as 5% of routing capacity within these dominant networks could create significant connectivity problems for the overall system.
Another key trend in network resilience comes from the use of the Tor network. The analysis recorded that by 2025, just over 60% of Bitcoin nodes were accessible through Tor—up from only a handful in the early 2010s. Tor provides alternative communication channels that increase redundancy and allow the network to reroute data if traditional internet routes fail, with many Tor relays situated in European nations that have robust fiber infrastructure.
According to the published analysis, “Bitcoin survives massive random cable outages. Targeting key hosting providers could disrupt the network with minimal infrastructure damage.”
