Solana came close to losing transaction finality on August 12 after 28.83% of staked SOL went delinquent following a routing failure at infrastructure provider Teraswitch, according to an analysis published by liquid-staking platform Marinade Finance. The incident brought the network to roughly 86% of the 33.34% threshold at which Solana's consensus mechanism would stop finalizing transactions, leaving about 19.9 million SOL of stake as the only buffer between a routine glitch and a full network halt.
The fault traced back to a bad internet route originating at Teraswitch's Miami facility that propagated outward to data centers in Europe and Asia, cutting off validators in London, Amsterdam, Frankfurt, Singapore and Tokyo while North American infrastructure stayed online. Roughly 90 validators went offline in total, collectively forfeiting 333 SOL in staking rewards, with traffic beginning to recover within about 10 minutes and full restoration taking as long as 33 minutes for some operators.
A single network provider held a quarter of all staked SOL
The incident exposed a concentration risk that had been building beneath the surface of Solana's validator set. Autonomous system AS20326, which hosts more than a quarter of all staked SOL — nearly 119 million SOL, above the Solana Foundation's own 25% recommended cap for any single autonomous system — saw 94% of its stake go dark simultaneously when the routing fault hit. A network intended to be decentralized across thousands of independent validators found a meaningful share of its consensus power routed through, in practice, a single point of failure.
Marinade tightens its own delegation limits
In response, Marinade said it will tighten its per-ASN and per-data-center concentration limits for the stake it delegates and begin publishing whether individual validators support hot-swap and automatic failover capabilities, giving delegators more visibility into infrastructure risk before an incident rather than after. Marinade's own review found that four autonomous systems account for two-thirds of the stake distributed through its allocation model, with one alone responsible for nearly 37% — concentration levels the platform now says it will actively work to reduce.
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Solana avoided a halt this time, but the episode is a reminder that validator count alone doesn't guarantee resilience if a large share of that stake depends on a handful of shared network providers. Whether other staking platforms follow Marinade's lead in tightening concentration limits may determine how much closer the next routing incident comes to the finality threshold.
