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confirmation

The Ethereum team is testing fast confirmation rules, aiming to reduce the cross-chain bridge waiting time to about 13 seconds

According to Cointelegraph, the Ethereum client team is testing a mechanism called Fast Confirmation Rules (FCR), aimed at compressing the deposit confirmation time from L1 to L2 networks and exchanges to about 13 seconds, reducing it by up to 98% compared to existing solutions. This mechanism was proposed by Ethereum researcher Julian Ma.FCR determines whether a block can be considered confirmed by evaluating the validators' attestations, rather than relying on the traditional block depth counting method. Its operation is based on two premises: that network message propagation is fast enough, and that no single entity holds more than 25% of the staked ETH. Currently, most users rely on canonical bridges to complete asset transfers, which typically require waiting about 13 minutes; some exchanges and L2s have adopted "k-depth" confirmation rules to shorten the wait, but this method lacks formal security guarantees.FCR can be deployed without a hard fork, and nodes can independently enable it without the need for coordination across the entire network. Ethereum co-founder Vitalik Buterin expressed support for this, believing that the mechanism can provide "hard guarantees" for transactions within a single time slot (about 12 seconds) under specific network conditions. However, there are still voices of skepticism in the community, with some users concerned about whether its trust assumptions can hold up under network pressure. Currently, client and API integration work is still ongoing.

Delphi Digital: Solana's major upgrade Alpenglow is expected to launch in 2026, theoretically reducing confirmation delays by 100 times

Delphi Digital posted on platform X that Solana is preparing for a major upgrade called Alpenglow. This upgrade is a complete overhaul of the consensus mechanism, aiming to achieve sub-second finality by replacing Tower BFT and Proof of History (PoH).Alpenglow introduces two new protocol components: Votor and Rotor. Votor replaces the incremental voting rounds of Tower BFT with a lightweight voting aggregation model. Validators can aggregate votes off-chain before submitting the final confirmation, allowing blocks to achieve finality within 1 to 2 confirmation rounds. This improvement reduces the theoretical finality delay to 100 to 150 milliseconds, shortening it by about 100 times from the original 12.8 seconds.Votor achieves finality through two parallel paths: when a proposed block receives over 80% of the total staked weight in the first round, it triggers fast confirmation and takes effect immediately; if the support rate is between 60% and 80% in the first round, it triggers slow confirmation, requiring a second round of voting to exceed 60% for final confirmation.Rotor reconfigures Solana's block propagation layer. The original Turbine propagation network relied on multi-hop relays with variable delays, while Rotor introduces a staked-weight relay path that prioritizes bandwidth efficiency. Validators with high stakes and reliable bandwidth will become core relay points. Simulation data shows that under typical bandwidth conditions, block propagation can be completed in as fast as 18 milliseconds. This upgrade is expected to be rolled out gradually, with an initial launch timeframe anticipated between early to mid-2026.
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