Ethereum developers are testing a fast confirmation mechanism (Fast Confirmation Rule, FCR) designed to accelerate transfers between the main network and Layer 2 from 13 minutes to 13 seconds. This was revealed by ecosystem researcher Julian Ma.
— Julian (@_julianma) March 17, 2026
Currently, users rely on bridges. Transactions await multiple confirmations or full finality. Many exchanges and L2s do not wait for this, instead using the k-deep rule: an operation is considered final only after a certain number of blocks have passed. However, this approach offers no formal guarantees.
How FCR Works
Instead of counting blocks, the mechanism analyses validator attestations to determine if a record in the chain can be considered securely confirmed — this speeds up bridge operations. The rule operates under two assumptions:
- The network is sufficiently fast, and validator messages arrive within seconds.
- No participant controls more than 25% of all ETH in staking.
These conditions are less stringent than Ethereum’s full finality requirements, yet they suffice for most practical purposes.
“When a node detects that greater security is needed, it waits longer before quickly confirming a block. This is not a bug, but a feature,” Ma explained.
The developer noted that implementing the new rule will not require a hard fork — developers are already integrating it into clients and API. Once deployed, nodes will be able to use the mechanism without network-wide coordination. It is expected that exchanges, L2s, and infrastructure projects will adopt it with minimal adjustments.
Community Reaction
Project co-founder Vitalik Buterin endorsed the mechanism. According to him, under certain conditions, FCR provides a “hard guarantee” that an operation will not be reversed after just one slot — about 12 seconds.
A new fast confirmation rule mechanism lets you get a hard guarantee that Ethereum will not revert after one slot (12 seconds)
Security assumptions are (i) supermajority honest, (ii) network latency under ~3s. So one step below economic finality, but very strong for many use…
— vitalik.eth (@VitalikButerin) March 18, 2026
However, the community’s response was mixed. A user under the pseudonym serx pointed out that the mechanism’s security entirely depends on the honesty of the majority of validators. If this fails, the entire structure could collapse.
Some questioned whether the basic assumptions of FCR would hold under real-world stress and remain effective under pressure.
12-second near-finality is huge for UX
But can those assumptions hold under stress?— CryptoJoeXX (@IHeddaji) March 18, 2026
Back in February, an Ethereum Foundation member under the pseudonym ladislaus announced that the network is transitioning from re-executing all transactions on nodes to confirming the correctness of operations using zkEVM.