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Danny Ryan 2021-05-11 07:28:24 -06:00
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12
specs/altair/validator.md
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@ -146,6 +146,7 @@ This function is a predicate indicating the presence or absence of the validator
*Note*: Being assigned to a sync committee for a given `slot` means that the validator produces and broadcasts signatures for `slot - 1` for inclusion in `slot`.
This means that when assigned to an `epoch` sync committee signatures must be produced and broadcast for slots on range `[compute_start_slot_at_epoch(epoch) - 1, compute_start_slot_at_epoch(epoch) + SLOTS_PER_EPOCH - 1)`
rather than for the range `[compute_start_slot_at_epoch(epoch), compute_start_slot_at_epoch(epoch) + SLOTS_PER_EPOCH)`.
To reduce complexity during the Altair fork, sync committees are not expected to produce signatures for `compute_epoch_at_slot(ALTAIR_FORK_EPOCH) - 1`.
```python
def compute_sync_committee_period(epoch: Epoch) -> uint64:
@ -296,11 +297,14 @@ The `subnet_id` is derived from the position in the sync committee such that the
```python
def compute_subnets_for_sync_committee(state: BeaconState, validator_index: ValidatorIndex) -> Sequence[uint64]:
next_slot_epoch = compute_epoch_at_slot(Slot(state.slot + 1))
if compute_sync_committee_period(get_current_epoch(state)) == compute_sync_committee_period(next_slot_epoch):
sync_committee = state.current_sync_committee
else:
sync_committee = state.next_sync_committee
target_pubkey = state.validators[validator_index].pubkey
sync_committee_indices = [
index for index, pubkey in enumerate(state.current_sync_committee.pubkeys)
if pubkey == target_pubkey
]
sync_committee_indices = [index for index, pubkey in enumerate(sync_committee.pubkeys) if pubkey == target_pubkey]
return [
uint64(index // (SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT))
for index in sync_committee_indices