A new collaborative report by ARK Invest and Glassnode has introduced the "critical resilience threshold," a metric quantifying the minimum number of entities required to disrupt a blockchain. By analyzing the concentration of block production and voting power, the framework offers a comparative look at the security profiles of Bitcoin, Ethereum, and Solana.
Defining the Thresholds of Control
The report identifies that just three entities control enough hash rate or stake to cross a protocol-relevant threshold on both the Bitcoin and Ethereum networks. For Bitcoin, this reflects the dominance of major mining pools like Foundry USA and AntPool, though individual miners can redirect their power in seconds if a pool acts maliciously. Ethereum faces a similar concentration among top staking entities, though the impact of coordination varies based on whether a group seeks to delay finality at 33% stake or censor transactions at 50%. In contrast, Solana requires a larger coalition of 19 validators to reach a similar disruption point, suggesting a higher level of validator-level decentralization for consensus-specific tasks.
The Hidden Layers of Vulnerability
True network resilience extends beyond simple entity counts to include infrastructure, software diversity, and the "exit speed" of participants. While Solana has a higher validator count, a significant portion of its stake is hosted in concentrated commercial data centers, creating a correlated failure risk if a provider goes offline. Ethereum faces risks from software monocultures, such as a high percentage of nodes running the Geth client, which could lead to widespread outages if a shared bug is triggered. Bitcoin remains a leader in the composite ranking because it pairs high auditability with the ability for miners to exit or switch pools almost instantly, preventing persistent capture. Institutions must evaluate these multi-dimensional risks—ranging from legal pressure to software faults—to truly understand the settlement infrastructure they choose to trust.
