Ethereum's new FCR could reduce transaction confirmation times from 13 minutes to 13 seconds, boosting efficiency for users.
Ethereum developers are piloting a new Fast Confirmation Rule (FCR), which could drastically reduce transfer times between the main network and Layer 2 solutions from 13 minutes to a mere 13 seconds, as announced by researcher Julian Ma.
Currently, users depend on bridges for transactions that require several confirmations for finality. Many platforms employ a k-deep rule, where an operation is deemed final only after a specified number of blocks are processed. However, this method does not provide absolute guarantees.
Functioning of the Fast Confirmation Rule
The FCR mechanism shifts the focus from block counting to analyzing validator attestations to confirm records on the blockchain, thereby accelerating bridge operations. It operates on two primary assumptions: that the network is efficient enough for validator messages to arrive in seconds, and that no single participant controls over 25% of all staked ETH. While these conditions are not as rigorous as Ethereum's complete finality criteria, they are sufficient for most practical applications.
“When a node identifies increased security needs, it may delay confirming a block. This adaptability is intentional,” said Ma.
Importantly, implementing FCR will not necessitate a hard fork; developers are embedding it directly into clients and APIs. After its deployment, nodes can utilize this mechanism autonomously, facilitating easy adoption by exchanges, Layer 2 solutions, and other infrastructure projects.
Reactions from the Ethereum Community
Ethereum co-founder Vitalik Buterin has expressed support for the FCR, highlighting that it can provide a "hard guarantee" against reversion after just one slot, or approximately 12 seconds, under specific conditions.
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 cases…
— vitalik.eth (@VitalikButerin) March 18, 2026
Despite the endorsement, reactions within the community have been mixed. A user known as serx raised concerns that the security of the FCR is contingent on a majority of validators being honest, warning that if this assumption fails, the system could be at risk. Others questioned whether the foundational assumptions of the FCR could withstand real-world challenges and remain reliable.
12-second near-finality is huge for UX. But can those assumptions hold under stress?
— CryptoJoeXX (@IHeddaji) March 18, 2026
Additionally, it was noted that the Ethereum network is evolving, with plans to shift from re-executing all transactions to verifying operational correctness using zkEVM technology, as stated by an Ethereum Foundation member in February.
