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EIP-8390 Remove the Sync Committee

DraftCorecreated 2026-08-22

Remove the onchain Altair sync committee and its rewards, superseded by offchain ZK proofs

Author: Lion (@dapplion)

What the specification covers

AbstractMotivationThe replacement is feasible todaySpecificationExecution layerConsensus layerRemoved constantsRemoved containersRemoved functionsModified BeaconBlockBodyModified BeaconStateModified process_blockModified process_epochRewardsNetworkingValidator dutiesFork transitionRationaleRemoval instead of repairThe reward weight is not redistributedThe domain types are retiredBackwards CompatibilitySecurity ConsiderationsActivating before a replacementProof production is not incentivisedSignature replay through a reused domainCopyright

This proposal declares no Solidity interface, so there is nothing to compute. It may be a core protocol change, a meta proposal, or written in prose only.

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