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Merge pull request #384 from ethereum/JustinDrake-patch-1 

RANDAO hash chain and no stale shuffles
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Danny Ryan 2019-01-08 09:55:36 -07:00 committed by GitHub
parent 9f87511632 78ee210d56
commit d4271b6bbd
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1 changed files with 6 additions and 4 deletions
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10
specs/core/0_beacon-chain.md
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@ -184,6 +184,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
| - | - |
| `GENESIS_FORK_VERSION` | `0` |
| `GENESIS_SLOT` | `0` |
| `GENESIS_START_SHARD` | `0` |
| `FAR_FUTURE_SLOT` | `2**64 - 1` |
| `ZERO_HASH` | `bytes32(0)` |
| `EMPTY_SIGNATURE` | `[bytes48(0), bytes48(0)]` |
@ -862,7 +863,7 @@ def get_shuffling(seed: Hash32,
crosslinking_start_shard: int,
slot: int) -> List[List[ShardCommittee]]:
"""
Shuffles ``validators`` into shard committees using ``seed`` as entropy.
Shuffles ``validators`` into shard committees seeded by ``randao_mix`` and ``slot``.
"""
# Normalizes slot to start of epoch boundary
@ -878,7 +879,8 @@ def get_shuffling(seed: Hash32,
)
)
# Shuffle with seed
# Shuffle
seed = xor(randao_mix, bytes32(slot))
shuffled_active_validator_indices = shuffle(active_validator_indices, seed)
# Split the shuffled list into epoch_length pieces
@ -1206,7 +1208,7 @@ def get_initial_beacon_state(initial_validator_deposits: List[Deposit],
activate_validator(state, validator_index, True)
# Set initial committee shuffling
initial_shuffling = get_shuffling(ZERO_HASH, state.validator_registry, 0, GENESIS_SLOT)
initial_shuffling = get_shuffling(ZERO_HASH, state.validator_registry, GENESIS_START_SHARD, GENESIS_SLOT)
state.shard_committees_at_slots = initial_shuffling + initial_shuffling
return state
@ -1402,7 +1404,7 @@ Below are the processing steps that happen at every `block`.
* Let `repeat_hash(x, n) = x if n == 0 else repeat_hash(hash(x), n-1)`.
* Let `proposer = state.validator_registry[get_beacon_proposer_index(state, state.slot)]`.
* Verify that `repeat_hash(block.randao_reveal, proposer.randao_layers) == proposer.randao_commitment`.
* Set `state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH] = xor(state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH], block.randao_reveal)`
* Set `state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH] = hash(xor(state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH], block.randao_reveal))`
* Set `proposer.randao_commitment = block.randao_reveal`.
* Set `proposer.randao_layers = 0`.