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EIP-8243 Batching Attestations at Source

DraftCorecreated 2026-05-01

Allow validators scheduled for duty on the same committee to publish a single pre-aggregated attestation in place of N individual ones

Authors: Raúl Kripalani (@raulk), Toni Wahrstätter (@nerolation), Mikhail Kalinin (@mkalinin)

What the specification covers

AbstractMotivationSpecificationNew constantsNew containersSSZ union serializationHelper functionsState transition changesP2P changesGossip validation rulesAttestation deduplicationRationaleWhy a per-validator seal?Why bind the seal to (slot, committee_index, batcher) only, and not to aggregation_bits?Why the subset dedup rule?Why no slashing condition?Backwards CompatibilitySecurity ConsiderationsSpam boundSignature theft inviableLeaked singles do not suppress batchesOperational disciplineDVT and pooled staking compatibilitySeal pre-signing and batcher failoverGriefing resistanceValidator colocation leakageCopyright

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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