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add documentation about duplicate pubkeys

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Alex Stokes 2021-05-04 12:16:39 -07:00
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commit 9c3d5982cf
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specs/altair/beacon-chain.md
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@ -302,6 +302,14 @@ def get_sync_committee_indices(state: BeaconState, epoch: Epoch) -> Sequence[Val
def get_sync_committee(state: BeaconState, epoch: Epoch) -> SyncCommittee:
"""
Return the sync committee for a given ``state`` and ``epoch``.
``SyncCommittee`` contains an aggregate pubkey that enables
resource-constrained clients to save some computation when verifying
the sync committee's signature.
``SyncCommittee`` can also contain duplicate pubkeys, when ``get_sync_committee_indices``
returns duplicate indices. Implementations must take care when handling
optimizations relating to aggregation and verification in the presence of duplicates.
"""
indices = get_sync_committee_indices(state, epoch)
pubkeys = [state.validators[index].pubkey for index in indices]