Researchers have published the first longitudinal study of Bitcoin's resilience to submarine cable failures, and the findings challenge conventional assumptions in both directions.

What the Study Found

The paper, posted to arXiv this February, analyzed 11 years of Bitcoin peer-to-peer network data (2014–2025) against 68 verified submarine cable fault events. Using 1,000 Monte Carlo simulations per scenario, researchers found that between 72% and 92% of the world's inter-country cables would need to fail simultaneously before Bitcoin experiences meaningful node disconnection.

Historical data backs this up: 87% of the 68 real-world cable failures studied caused less than 5% node impact. The largest single event — simultaneous seabed damage off Côte d'Ivoire in March 2024 — knocked out 43% of regional nodes but affected only 0.03% of the global Bitcoin network.

The correlation between cable failures and Bitcoin's price was essentially zero (-0.02).

Where the Real Risk Lies

Random failures and targeted attacks present fundamentally different threat models. While random cable failures require 72–92% removal to cause damage, a coordinated attack targeting cables with the highest network centrality drops that threshold to just 20%. Targeting the top five hosting providers by node count requires removing only 5% of routing capacity to achieve similar impact.

That asymmetry defines the real vulnerability: not natural disasters or accidents, but deliberate state-level or coordinated attacks on critical infrastructure chokepoints.

TOR Makes Bitcoin Stronger

As of 2025, 64% of Bitcoin nodes operate through TOR, with unobservable physical locations. The intuitive concern is that hidden nodes could mask fragility — but the study found the opposite.

TOR relay infrastructure is heavily concentrated in well-connected European countries, making it physically difficult to disrupt. The researchers' four-layer model found TOR adoption consistently increased resilience by 0.02 to 0.10 above the clearnet-only baseline. The Bitcoin community's shift toward censorship-resistant infrastructure — driven by events like Iran's 2019 internet shutdown and the 2021 China mining ban — inadvertently made the network harder to physically disconnect.

Bitcoin's resilience has evolved unevenly: highest during 2014–2017, lowest in 2021 during peak mining concentration in East Asia, and partially recovered since the China mining ban redistributed nodes globally.