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Update 0_beacon-chain.md

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Justin 2019-01-02 15:21:22 +00:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -863,12 +863,12 @@ def split(values: List[Any], split_count: int) -> List[Any]:
#### `get_new_shuffling` #### `get_new_shuffling`
```python ```python
def get_new_shuffling(seed: Hash32, def get_new_shuffling(randao_mix: Hash32,
slot: int, slot: int,
validators: List[ValidatorRecord], validators: List[ValidatorRecord],
crosslinking_start_shard: int) -> List[List[ShardCommittee]]: crosslinking_start_shard: int) -> List[List[ShardCommittee]]:
""" """
Shuffles ``validators`` into shard committees using ``seed`` and ``slot`` as entropy. Shuffles ``validators`` into shard committees seeded by ``randao_mix`` and ``slot``.
""" """
active_validator_indices = get_active_validator_indices(validators) active_validator_indices = get_active_validator_indices(validators)
@ -880,8 +880,9 @@ def get_new_shuffling(seed: Hash32,
) )
) )
# Shuffle with seed # Shuffle
shuffled_active_validator_indices = shuffle(active_validator_indices, xor(seed, Hash32(slot)) seed = xor(randao_mix, Hash32(slot))
shuffled_active_validator_indices = shuffle(active_validator_indices, seed)
# Split the shuffled list into epoch_length pieces # Split the shuffled list into epoch_length pieces
validators_per_slot = split(shuffled_active_validator_indices, EPOCH_LENGTH) validators_per_slot = split(shuffled_active_validator_indices, EPOCH_LENGTH)