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Add `shard_block.slot` to seed

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Hsiao-Wei Wang 2020-06-04 11:19:04 +08:00
parent c0108afe77
commit 8afb93f5a3
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1 changed files with 6 additions and 2 deletions
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8
specs/phase1/beacon-chain.md
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@ -537,9 +537,13 @@ def get_light_client_committee(beacon_state: BeaconState, epoch: Epoch) -> Seque
```python
def get_shard_proposer_index(beacon_state: BeaconState, slot: Slot, shard: Shard) -> ValidatorIndex:
committee = get_shard_committee(beacon_state, compute_epoch_at_slot(slot), shard)
"""
Return the proposer's index of shard block at ``slot``.
"""
epoch = compute_epoch_at_slot(slot)
r = bytes_to_int(get_seed(beacon_state, epoch, DOMAIN_SHARD_COMMITTEE)[:8])
committee = get_shard_committee(beacon_state, epoch, shard)
seed = hash(get_seed(beacon_state, epoch, DOMAIN_SHARD_COMMITTEE) + int_to_bytes(slot, length=8))
r = bytes_to_int(seed[:8])
return committee[r % len(committee)]
```