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Merge pull request #2277 from ralexstokes/fix-altair-val-guide 

Fix use of block root in Altair validator guide
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Danny Ryan 2021-03-29 07:59:02 -06:00 committed by GitHub
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specs/altair/validator.md
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@ -266,15 +266,16 @@ If a validator is in the current sync committee (i.e. `is_assigned_to_sync_commi
This logic is triggered upon the same conditions as when producing an attestation.
Meaning, a sync committee member should produce and broadcast a `SyncCommitteeSignature` 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.
`get_sync_committee_signature` assumes `state` is the head state corresponding to processing the block at the current slot as determined by the fork choice (including any empty slots processed with `process_slots`), `validator_index` is the index of the validator in the registry `state.validators` controlled by `privkey`, and `privkey` is the BLS private key for the validator.
`get_sync_committee_signature` assumes `state` is the head state corresponding to processing the block at the current slot as determined by the fork choice (including any empty slots processed with `process_slots`), `block_root` is the root of the head block whose processing results in `state`, `validator_index` is the index of the validator in the registry `state.validators` controlled by `privkey`, and `privkey` is the BLS private key for the validator.
```python
def get_sync_committee_signature(state: BeaconState,
block_root: Root,
validator_index: ValidatorIndex,
privkey: int) -> SyncCommitteeSignature:
epoch = get_current_epoch(state)
domain = get_domain(state, DOMAIN_SYNC_COMMITTEE, epoch)
signing_root = compute_signing_root(get_block_root_at_slot(state, state.slot), domain)
signing_root = compute_signing_root(block_root, domain)
signature = bls.Sign(privkey, signing_root)
return SyncCommitteeSignature(slot=state.slot, validator_index=validator_index, signature=signature)