ACDC #187 · Sepolia fork Scheduled for October 6
AllCoreDevs - Consensus #187 · 2026-09-17
Glamsterdam goes onto the first public testnet
The Glamsterdam fork on the Sepolia testnet was set for October 6, and Hoodi is tentatively October 27. Candidate sorting for the next fork, Hegota, also began: EIP-8015 moved to Considered for Inclusion (CFI), seven EIPs were declined (DFI), and the issuance-reduction EIP-8363 was put on hold with no decision.
Why it matters
With Glamsterdam on the public testnet schedule, changes such as the gas limit increase are getting closer to mainnet. Meanwhile, a consensus emerged that the issuance EIP, which would reduce staking rewards, cannot be decided by core developers alone, and discussion of a new decision-making process for proposals like this is beginning.
Decisions
- QUIC as default: All clients agreed to enable QUIC by default in the Glamsterdam release and to deprecate MPLEX (not remove it) in a release after mainnet activation. This is a preparatory step toward moving node-to-node communication to the new protocol, and spec PR 3866 will be merged after the fork.
- Sepolia October 6: The Sepolia fork was set for October 6, and the Hoodi fork was tentatively set for October 27. If Sepolia goes smoothly, the Hoodi date will be confirmed on the October 8 ACD call.
- EIP-8411 PFI: EIP-8411 (Fast Execution Payload Broadcast) was accepted as a Hegotá candidate (PFI). Whether to move it to Considered for Inclusion (CFI) was deferred until scoping decisions on the other EIPs are finished.
- EIP-8015 CFI: EIP-8015, which removes the unused beacon state fields deposit and eth1data, was moved to Hegotá Considered for Inclusion (CFI). It is a change that cleans up data that currently serves no function.
- EIP-8365 narrowed: EIP-8365 is likely to get CFI as a narrowed proposal that drops forced exits and keeps only blocking new 0x00 deposits, with exits deferred to the I-Star fork. The revised version is expected to be confirmed as a formal CFI at the next ACDC.
- Seven EIPs DFI'd together: Seven EIPs, EIP-8237, 8341, 8367, 8321, 8243, 8146 and 8375, were declined for inclusion (DFI) from the Hegotá candidates. Work related to post-quantum (PQ), including hash-chain RANDAO, will continue informally during the Hegotá period.
- Issuance on hold: The issuance-reduction EIP-8363 was put on hold and not decided today. stokes will propose a process for gathering broader community input before the next ACDC.
Discussion
MPLEX deprecation and QUIC as default
This is about removing MPLEX, the legacy multiplexing protocol used for node-to-node communication, and moving to QUIC, an issue that has been postponed for three years.
Outcome: Scheduled decision 00:15:32
Testnet builder circuit breaker
A discussion that called for safeguards before the fork, because builders, who build blocks on behalf of proposers, can be faked on testnets with free ETH to paralyze the chain.
EIP-8365 forced exit reduction
In EIP-8365, which retires the legacy BLS withdrawal credentials (0x00), the issue became whether to include forced exits of existing validators in Hegotá.
Outcome: CFI consensus 01:07:28
EIP-8363 issuance decision process
Over EIP-8363, which would reduce Ethereum issuance, the issue became whether the core developer call has the standing and the process to make such a decision.
Outcome: On hold 01:20:47
Glossary
- SFI: Scheduled for Inclusion, the state where inclusion in the fork is confirmed
- CFI: Considered for Inclusion, the state in which inclusion in the fork is under formal review
- PFI: Proposed for Inclusion, the state in which a proposal has been accepted as a fork candidate
- DFI: Declined for Inclusion, the status of having been dropped from fork candidates
- QUIC: A modern UDP-based transport protocol that replaces TCP
- MPLEX: A legacy stream multiplexing protocol used for connections between nodes, scheduled to be deprecated
- Builder: An entity that specializes in block production and bids to validators
- PQ: Post-quantum, a cryptographic scheme that withstands attacks from quantum computers
EIPs covered
- EIP-8015 Removal of Deposit and Eth1 Data Fields
- EIP-8146 Block access list sidecar
- EIP-8237 Independent sync for the consensus and execution layers
- EIP-8243 Source-stage attestation batching
- EIP-8321 Hash-chain RANDAO
- EIP-8341
- EIP-8363 Declining issuance burn
- EIP-8365 Ban on registering new 0x00 validators
- EIP-8367
- EIP-8375
- EIP-8411 Fast propagation of execution payloads