Ethereum Proposes Radical Speedup with Fast Confirmation Rule

Ethereum researcher Julian Ma has proposed the Fast Confirmation Rule (FCR), a mechanism that would significantly reduce deposit times from Ethereum's mainnet to Layer 2 networks and centralized exchanges. According to Ma, FCR would slash these times from around 13 minutes to approximately 13 seconds.

The proposal directly targets one of the most persistent friction points in the Ethereum ecosystem: the delay incurred when moving assets from the base layer to L2s or exchanges. Most platforms currently rely on 'k-deep' confirmation rules, which offer no formal security guarantees. FCR replaces this heuristic with an attestation-based model that counts validator votes rather than blocks.

FCR operates one level below Ethereum's formal finality and rests on two explicit assumptions: that the network delivers attestations within approximately 8 seconds, and that no single actor controls more than 25% of staked ETH. If either condition fails, FCR stalls and falls back to the finalized head rather than producing an unsafe confirmation.

Consensus layer client teams are already working on implementations. Vitalik Buterin has endorsed the proposal, describing it as providing 'a hard guarantee that Ethereum will not revert after one slot (12 seconds).' However, some developers have noted concerns regarding the 'supermajority honest' assumption and its potential impact on FCR's liveness.