Ethereum (ETH) Foundation researcher Julian Ma has proposed the Fast Confirmation Rule (FCR), a mechanism that would reduce deposit times from Ethereum mainnet to Layer 2 networks and centralized exchanges from roughly 13 minutes to approximately 13 seconds - without requiring a hard fork.
Co-founder Vitalik Buterin endorsed the proposal on X, describing it as providing "a hard guarantee that Ethereum will not revert after one slot (12 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 - waiting for a transaction to be buried beneath a fixed number of subsequent blocks - which offer no formal security guarantees. FCR replaces that heuristic with an attestation-based model that counts validator votes rather than blocks.
How FCR Works
Under FCR, a block is treated as confirmed once sufficient validator attestations have accumulated - a process that takes roughly 13 seconds under normal network conditions.
The mechanism 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.
That fallback is a deliberate design feature. Ma described FCR as degrading gracefully: "As soon as sufficiently many attestations are delivered, the block is fast-confirmed. In the worst case, FCR falls back to finality." If FCR's assumptions do hold, Ma said a fast-confirmed block "will be finalized with certainty."
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Rollout and Industry Impact
Consensus layer client teams are already working on implementations. The rule activates via a configuration flag and queries the existing JSON-RPC safe tag - requiring no new API endpoints and no network-wide coordination.
Ma described an "80-98% reduction" in deposit times for most L2s and exchanges. Buterin called it "very strong for many use cases."
Not all observers were convinced. Reviewing the proposal publicly, some developers noted that the "supermajority honest" assumption carries significant weight. If adversarial stake exceeds 25%, FCR can lose liveness - stalling confirmations entirely, rather than producing incorrect ones.
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