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Allow light client updates to only improve optimistic header #2811

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Allow light client updates to only improve optimistic header #2811

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6 changes: 4 additions & 2 deletions specs/altair/sync-protocol.md
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Original file line number Diff line number Diff line change
Expand Up @@ -152,9 +152,11 @@ def validate_light_client_update(store: LightClientStore,
update: LightClientUpdate,
current_slot: Slot,
genesis_validators_root: Root) -> None:
# Verify update slot is larger than slot of current best finalized header
# Verify update is relevant
active_header = get_active_header(update)
assert current_slot >= active_header.slot > store.finalized_header.slot
assert current_slot >= active_header.slot >= store.finalized_header.slot
if active_header.slot == store.finalized_header.slot:
assert update.attested_header.slot > store.optimistic_header.slot

# Verify update does not skip a sync committee period
finalized_period = compute_epoch_at_slot(store.finalized_header.slot) // EPOCHS_PER_SYNC_COMMITTEE_PERIOD
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