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EIP-8333 Align Checkpoint with Epoch Boundary Block

DraftCorecreated 2026-07-06

Resolve FFG checkpoints to the last block before the epoch instead of the first block of the epoch

Authors: Cayman (@wemeetagain), Nico Flaig (@nflaig), Lodekeeper (@lodekeeper), twoeths (@twoeths)

What the specification covers

AbstractMotivationSpecificationExecution layerConsensus layerNew get_checkpoint_slotNew get_checkpoint_rootModified functionsFork choiceHonest validatorFork transitionRationaleBackwards CompatibilityTest CasesSecurity ConsiderationsCopyright

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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