feat: update vc to submit beacon committee selections once per epoch #8669
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Summary of ChangesHello @nflaig, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly refactors the handling of beacon and sync committee selections for distributed validator clients. The core change involves shifting the submission of selection proofs from a per-slot operation within the Highlights
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Code Review
This pull request refactors the submission of beacon committee selections to occur once per epoch, rather than per slot. This is achieved by relocating the runDistributedAggregationSelectionTasks logic from AttestationService to AttestationDutiesService. A similar refactoring has been applied to sync committee duties, moving logic from SyncCommitteeService to SyncCommitteeDutiesService. The changes are logical and align with the goal of reducing submission frequency.
I have one suggestion to improve the robustness of the new implementation in attestationDuties.ts.
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Performance Report🚀🚀 Significant benchmark improvement detected
Full benchmark results
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nflaig
commented
Dec 4, 2025
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| this.logger.debug("Submitting partial beacon committee selection proofs", {epoch, count: partialSelections.length}); | ||
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| const res = await this.api.validator.submitBeaconCommitteeSelections({selections: partialSelections}); |
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we call this with duties for a whole epoch, could consider batching the request but generally assume vc and charon run on the same host without any proxy in-between that could cause issues due to large request body size
| * 3. Mutate duty objects to set selection proofs for aggregators | ||
| * 4. Resubscribe validators as aggregators on beacon committee subnets | ||
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| * See https://docs.google.com/document/d/1q9jOTPcYQa-3L8luRvQJ-M0eegtba4Nmon3dpO79TMk/mobilebasic |
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the google doc is no longer accessible
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Motivation
Closes #8606
Description
This updates our implementation to be compliant with latest spec ethereum/beacon-APIs#368.
For sync committee aggregation selection (unchanged)
submitSyncCommitteeSelectionsat the start of the slotCONTRIBUTION_DUE_BPSinto the slot (8 seconds)For attestation aggregation selection
submitBeaconCommitteeSelectionsat the start of the epoch for current and next epoch (2 separate calls)SLOT_DURATION_MS(12 seconds)prepareBeaconCommitteeSubnetonce the above call either resolved or fails, this should fine as it's not that time sensitive (one epoch lookahead)submitBeaconCommitteeSelectionswith duties of affected epochPrevious PR #5344