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Merge pull request #2485 from nisdas/patch-1 

Make The Nature of Validator Sync Committee Assignments Clearer
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Danny Ryan 2021-06-21 16:51:11 -05:00 committed by GitHub
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specs/altair/validator.md
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@ -265,7 +265,7 @@ This process occurs each slot.
##### Prepare sync committee message ##### Prepare sync committee message
If a validator is in the current sync committee (i.e. `is_assigned_to_sync_committee()` above returns `True`), then for every `slot` in the current sync committee period, the validator should prepare a `SyncCommitteeMessage` for the previous slot (`slot - 1`) according to the logic in `get_sync_committee_message` as soon as they have determined the head block of `slot - 1`. If a validator is in the current sync committee (i.e. `is_assigned_to_sync_committee()` above returns `True`), then for every `slot` in the current sync committee period, the validator should prepare a `SyncCommitteeMessage` for the previous slot (`slot - 1`) according to the logic in `get_sync_committee_message` as soon as they have determined the head block of `slot - 1`. This means that when assigned to `slot` a `SyncCommitteeMessage` is prepared and broadcast in `slot-1 ` instead of `slot`.
This logic is triggered upon the same conditions as when producing an attestation. This logic is triggered upon the same conditions as when producing an attestation.
Meaning, a sync committee member should produce and broadcast a `SyncCommitteeMessage` either when (a) the validator has received a valid block from the expected block proposer for the current `slot` or (b) one-third of the slot has transpired (`SECONDS_PER_SLOT / 3` seconds after the start of the slot) -- whichever comes first. Meaning, a sync committee member should produce and broadcast a `SyncCommitteeMessage` either when (a) the validator has received a valid block from the expected block proposer for the current `slot` or (b) one-third of the slot has transpired (`SECONDS_PER_SLOT / 3` seconds after the start of the slot) -- whichever comes first.