Lodestar, an Ethereum consensus layer client, supports the Fast Confirm Rule, allowing Ethereum node operators to confirm transactions in a single slot (~13 seconds) by using validator attestations. Fast Confirmation provides a middle ground, between the chain head and finalized status, for transaction confirmations. Rather than waiting ~12.8 minutes required for full transaction finality, ecosystem providers can reasonably operate on 13-second confirmations under normal network conditions.

The feature helps exchanges, bridges, and L2s speed up deposit and withdrawal processing times, resulting in a better experience for end users. The Fast Confirm Rule runs at the start of each slot, checks whether the current confirmed root still has sufficient attestation support under a configurable adversarial threshold (default: 25%), and either advances, stalls, or falls back toward finalized if assumptions no longer hold. The feature is new, disabled by default, and and performance-intensive in its current form.

Operators running mainnet validators should monitor CPU headroom and validator effectiveness before relying on it for economic decisions Nimbus has also shipped FCR support and Lighthouse has an implementation PR in flight.

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