Ethereum Centralization Risk: Bitmine's Large Stake Threatens Exit Queues

Bitmine's large Ethereum stake poses a risk of centralization to the network. The company holds approximately 4.9 million ETH, which accounts for about 12% of the total supply staked. This concentration creates a dependency that other validators may not consider when determining their target utilization rate.

If Bitmine is forced to liquidate even a portion of its position to meet its preferred stock dividend obligations, it could surge the exit queue, affecting every other validator waiting to withdraw. The Kiln incident in 2025 serves as a reference point for this risk, where 1.6 million ETH unstaked pushed exit queues to 50 days.

However, the Glamsterdam upgrade scheduled for Q4 2026 includes EIP-8061, which increases the exit churn limit four times and addresses the exit side of the validator queue. This change may mitigate some of the risks associated with Bitmine's large stake.