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Addressed Justin's 16, 17, 18

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vbuterin 2018-11-25 06:23:34 -05:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -44,7 +44,6 @@ The primary source of load on the beacon chain are "attestations". Attestations
| `MIN_VALIDATOR_SET_CHANGE_INTERVAL` | 2**8 (= 256) | slots | ~25 minutes |
| `SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD` | 2**17 (= 131,072) | slots | ~9 days |
| `MIN_ATTESTATION_INCLUSION_DELAY` | 2**2 (= 4) | slots | ~24 seconds |
| `RANDAO_SLOTS_PER_LAYER` | 2**12 (= 4,096) | slots | ~7 hours |
| `SQRT_E_DROP_TIME` | 2**18 (= 262,144) | slots | ~18 days |
| `WITHDRAWALS_PER_CYCLE` | 2**2 (=4) | validators | 5.2m ETH in ~6 months |
| `MIN_WITHDRAWAL_PERIOD` | 2**13 (= 8,192) | slots | ~14 hours |
@ -55,6 +54,7 @@ The primary source of load on the beacon chain are "attestations". Attestations
| `BASE_REWARD_QUOTIENT` | 2**15 (= 32,768) | — |
| `MAX_VALIDATOR_CHURN_QUOTIENT` | 2**5 (= 32) | — |
| `POW_CONTRACT_MERKLE_TREE_DEPTH` | 2**5 (= 32) | - |
| `MAX_ATTESTATION_COUNT` | 2**7 (= 128) | - |
| `LOGOUT_MESSAGE` | `"LOGOUT"` | — |
| `INITIAL_FORK_VERSION` | 0 | — |
@ -263,8 +263,8 @@ A `ValidatorRecord` has the following fields:
'withdrawal_credentials': 'hash32',
# RANDAO commitment
'randao_commitment': 'hash32',
# Slot the RANDAO commitment was last changed
'randao_last_change': 'uint64',
# Slot the proposer has skipped (ie. layers of RANDAO expected)
'randao_skips': 'uint64',
# Balance in Gwei
'balance': 'uint64',
# Status code
@ -597,7 +597,9 @@ def deposit(deposit_params: bytes[2048]):
self.receipt_tree[index] = sha3(concat(self.receipt_tree[index * 2], self.receipt_tree[index * 2 + 1]))
self.total_deposit_count += 1
if self.total_deposit_count == 16384:
log.ChainStart(self.receipt_tree[1], timestamp_bytes8)
timestamp_day_boundary = (block.timestamp - block.timestamp % 86400) + 86400
timestamp_day_boundary_bytes8: bytes[8] = slice(convert(timestamp_day_boundary, 'bytes32'), 24, 8)
log.ChainStart(self.receipt_tree[1], timestamp_day_boundary_bytes8 )
@public
@constant
@ -733,7 +735,7 @@ def add_validator(validators: List[ValidatorRecord],
pubkey=pubkey,
withdrawal_credentials=withdrawal_credentials,
randao_commitment=randao_commitment,
randao_last_change=current_slot,
randao_skips=0,
balance=DEPOSIT_SIZE * GWEI_PER_ETH,
status=status,
last_status_change_slot=current_slot,
@ -800,7 +802,7 @@ def update_ancestor_hashes(parent_ancestor_hashes: List[Hash32],
### Verify attestations
For each `AttestationRecord` object:
Verify that there are at most `MAX_ATTESTATION_COUNT` `AttestationRecord` objects. For each `AttestationRecord` object:
* Verify that `slot <= block.slot - MIN_ATTESTATION_INCLUSION_DELAY` and `slot >= max(parent.slot - CYCLE_LENGTH + 1, 0)`.
* Verify that `justified_slot` is equal to or earlier than `last_justified_slot`.
@ -824,10 +826,20 @@ Verify that `BLSVerify(pubkey=get_beacon_proposer(state, block.slot).pubkey, dat
### Verify and process RANDAO reveal
First run the following state transition to update `randao_skips` variables for the missing slots.
```python
for slot in range(parent.slot + 1, block.slot):
proposer = get_beacon_proposer(state, slot)
proposer.randao_skips += 1
```
Then:
* Let `repeat_hash(x, n) = x if n == 0 else repeat_hash(hash(x), n-1)`.
* Let `V = get_beacon_proposer(state, block.slot)`.
* Verify that `repeat_hash(block.randao_reveal, (block.slot - V.randao_last_change) // RANDAO_SLOTS_PER_LAYER + 1) == V.randao_commitment`
* Set `state.randao_mix = xor(state.randao_mix, block.randao_reveal)`, `V.randao_commitment = block.randao_reveal`, `V.randao_last_change = block.slot`
* Verify that `repeat_hash(block.randao_reveal, V.randao_skips + 1) == V.randao_commitment`
* Set `state.randao_mix = xor(state.randao_mix, block.randao_reveal)`, `V.randao_commitment = block.randao_reveal`, `V.randao_skips = 0`
### Process PoW receipt root