Cambridge's 11-Year Bitcoin Stress Test Finds Cable Failures Matter Less Than Cloud and Quantum Risks

On 15 March 2026, researchers at the Cambridge Centre for Alternative Finance published an 11-year study stress-testing Bitcoin's resilience to physical internet disruptions. Their data shows the network can endure failures affecting up to 92% of global submarine cables, while real-world incidents typically knocked out fewer than 5% of nodes. The study instead highlights concentration in five major cloud providers and a potential exposure of 4‑7 million BTC to future quantum attacks as the more pressing vulnerabilities.