Bitcoin’s community has been operating nonstop since 2009. The query no person had rigorously answered till now’s what it would really take to interrupt it.
Researchers at the Cambridge Centre for Different Finance final week published the first longitudinal study of Bitcoin blockchain’s resilience to bodily infrastructure disruption, analyzing 11 years of peer-to-peer community information in opposition to 68 verified submarine cable fault occasions.
The headline discovering is that between 72% and 92% of the world’s inter-country submarine cables would wish to fail concurrently earlier than Bitcoin experiences vital node disconnection.
In a world the place the Strait of Hormuz is presently disrupted and infrastructure vulnerability is entrance of thoughts, the examine supplies the first empirical benchmark for a way laborious Bitcoin really is to knock offline.
The numbers inform a story of a community that degrades gracefully reasonably than collapsing catastrophically. The researchers ran 1,000 Monte Carlo simulations per state of affairs throughout the full dataset and located that random cable failures barely register.
Over 87% of the 68 real-world cable fault occasions they studied triggered lower than 5% node influence. The biggest single occasion, when seabed disturbances off Côte d’Ivoire broken 7-8 cables concurrently in March 2024, knocked out 43% of regional nodes but affected solely 5-7 bitcoin nodes globally, roughly 0.03% of the community.
The correlation between cable failures and bitcoin’s value was primarily zero, at -0.02. Infrastructure disruptions are invisible in opposition to every day value volatility.
But the paper’s most essential discovering is the asymmetry between random and targeted assaults.
Whereas random cable failures require 72-92% removing to trigger harm, a targeted attack on the cables with the highest betweenness centrality, the ones that function chokepoints between continents, drops that threshold to twenty%.
And concentrating on the high five hosting providers by node depend, Hetzner, OVH, Comcast, Amazon, and Google Cloud, requires eradicating simply 5% of routing capability to realize the identical influence.
That is a basically totally different risk mannequin. Random failures are acts of nature. Targeted assaults are acts of state, coordinated regulatory shutdowns of hosting providers or deliberate severing of important cable routes. The examine primarily maps two very totally different adversaries: one Bitcoin can simply survive, and one that continues to be a credible threat.
How threats to bitcoin change over time
The paper tracks how resilience developed over time, and the trajectory is not a straight line. Bitcoin was most resilient in its early years from 2014-2017, when the community was geographically numerous and the important failure threshold sat round 0.90-0.92.
Resilience declined sharply throughout 2018-2021 as the community grew quickly but concentrated geographically, hitting its lowest level of 0.72 in 2021 throughout peak mining focus in East Asia. The China mining ban in 2021 compelled redistribution, and resilience partially recovered to 0.88 in 2022 earlier than settling at 0.78 in 2025.
The TOR discovering is the one which challenges standard considering. As of 2025, 64% of Bitcoin nodes use TOR, making their bodily location unobservable.
The idea has been that this lack of ability to watch may cover fragility, that if TOR nodes turned out to be geographically concentrated, the community could be extra weak than it seems.
The Cambridge researchers constructed a four-layer mannequin to check this and located the reverse. TOR relay infrastructure is closely concentrated in Germany, France, and the Netherlands, nations with in depth submarine cable and land border connectivity.
An attacker making an attempt to disrupt TOR relay capability by reducing cables faces a compound drawback as a result of these nations are amongst the hardest to disconnect. The four-layer mannequin persistently confirmed increased resilience than the clearnet-only baseline, with TOR including between 0.02 and 0.10 to the important failure threshold.
The paper frames this as “adaptive self-organization.” TOR adoption surged after censorship occasions like Iran’s web shutdown in 2019, the Myanmar coup in 2021, and the China mining ban.
The Bitcoin group shifted towards censorship-resistant infrastructure with none central coordination, and that shift occurred to additionally make the community bodily tougher to disrupt.
With the Strait of Hormuz successfully closed and a regional warfare disrupting infrastructure throughout the Center East, the query of what occurs to Bitcoin if submarine cables get broken is not theoretical.
The examine suggests the reply might be nothing, until somebody is intentionally concentrating on the particular cables and hosting providers that matter most.
