Unveiling Bitcoin’s Resilience: How Undersea Disruptions Barely Made a Ripple

In a remarkable show of resilience, the Bitcoin network remained largely unaffected by a significant internet outage in March 2024. The incident occurred when seabed movements off the Ivory Coast damaged seven undersea cables, disrupting internet services in the region. Remarkably, the global Bitcoin network did not falter, with only about five nodes impacted—a mere 0.03% of its entire infrastructure. Despite this occurrence, neither Bitcoin’s network consensus nor its price showed any significant disturbance.

Bitcoin: Stable Against Cable Disruptions

The stability of Bitcoin amidst such disruptions draws from a comprehensive Cambridge University study. Led by researchers Wenbin Wu and Alexander Neumueller, the study analyzed over a decade of network data combined with historical incidents of undersea cable faults. It was revealed that these events have historically had a minimal impact on Bitcoin. The study examined eight million node observations and 658 cables, noting considerable resilience. In fact, out of 385 cable failures analyzed, only 68 led to any network disruption.

Key vulnerabilities lie not in the physical cables but in specific network elements. The research identified three layers crucial to Bitcoin: submarine cables, autonomous systems for routing traffic, and the peer-to-peer protocol. To inflict noticeable damage, 72% to 92% of cables would need to be compromised simultaneously. More concerning, however, is the susceptibility of major hosting networks. A strategic attack could severely impair connectivity if even 5% of capacity among top providers like Hetzner and Google Cloud is affected.

Bitcoin’s network resilience further benefits from the decentralized nature of its structure, significantly bolstered by Tor adoption. Tor’s share in Bitcoin’s architecture surged from 23% in 2021 to 63% by 2026. This rise in adoption aligns with global events like Iran’s blackout and the Chinese mining prohibition, showcasing its fundamental role in maintaining network integrity.

“We found that it would take a vast, coordinated effort to critically disrupt both the open internet and Tor infrastructure,” notes the Cambridge study.

The geographic distribution of Bitcoin mining became more varied post-2021, as the concentration in East Asia diminished following China’s mining ban. This prompted a broader dispersal of mining operations around the globe, enhancing the network’s robustness.

Concerns over network stability persist, primarily due to the dominance of major cloud providers. Disruptions in services offered by companies like Amazon are considered potentially more damaging than physical cable faults. Despite this, technologies such as Blockstream’s satellite network continue to offer alternative avenues, ensuring Bitcoin’s adaptability and resistance to central failures.

• Only 68 out of 385 cable failures affected Bitcoin nodes.
• 63% of accessible Bitcoin nodes now operate through Tor.
• A coordinated attack would need to compromise over 70% of cables to significantly impact Bitcoin.

The persistence and stability of Bitcoin stand resilient amidst both physical and strategic challenges. Through technological advancements and distributed systems like Tor, the Bitcoin network remains largely impervious to disruptions that continue to challenge other traditional internet infrastructures.