Cambridge Spent 11 Years Stress-Testing Bitcoin — Here’s What They Found in Their Research

Key Highlights

• Bitcoin can withstand massive internet infrastructure disruption, including extreme submarine cable failures
• Real-world cable faults typically have minimal impact on Bitcoin node connectivity
• The main vulnerabilities are not physical cables, but cloud concentration and infrastructure centralisation
• Millions of BTC could be theoretically exposed to future quantum computing risks
• Targeted attacks on key network chokepoints are far more dangerous than random failures
• Tor-based routing improves resilience by reducing dependency on physical infrastructure mapping
• The study uses over a decade of network data and large-scale infrastructure modelling

Researchers from the Cambridge Centre for Alternative Finance have spent 11 years analysing Bitcoin’s resilience under extreme infrastructure stress, producing one of the most comprehensive studies ever conducted on the network’s physical and digital robustness.

The findings show that Bitcoin is significantly more resilient to real-world infrastructure failures than many critics assume. Even in scenarios involving massive disruption to submarine internet cables, the network continues operating with minimal impact. In most historical cable fault events, fewer than 5% of Bitcoin nodes were affected, suggesting strong redundancy in global connectivity systems.

The study’s modelling indicates that Bitcoin could theoretically continue functioning even if a very large portion of global undersea cable infrastructure failed simultaneously. However, researchers note that such a scenario is highly unrealistic, and real-world disruptions tend to be localized and quickly rerouted through alternative connections.

Where the research becomes more notable is in its identification of systemic risks. Rather than physical cable damage, the biggest structural vulnerability lies in the concentration of Bitcoin nodes within a small number of cloud computing providers. This creates potential single points of failure if those providers face coordinated outages, regulatory pressure, or service disruptions.

The researchers also highlight the role of network concentration in overall resilience. Because many Bitcoin nodes are hosted through a limited set of infrastructure providers, disruption at the cloud layer could have a far greater impact than physical damage to global internet cables.

Another long-term concern identified in the study is quantum computing. The researchers estimate that millions of bitcoins could eventually be exposed if sufficiently advanced quantum machines are developed that can break current cryptographic protections. However, they also stress that such technology is not currently available and is likely still years away from posing a practical threat.

The study also notes that Bitcoin’s peer-to-peer architecture, including privacy routing systems like Tor, contributes to its resilience by reducing dependency on identifiable physical infrastructure paths. This makes the network more difficult to disrupt through geographically targeted failures.

Ultimately, the research concludes that Bitcoin’s weakest points are not where many expect. Instead of collapsing under physical internet failures, the network’s real risks stem from centralisation in cloud hosting, potential coordinated infrastructure pressure, and long-term cryptographic evolution challenges such as quantum computing.