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eth2.0-specs
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Hsiao-Wei Wang 2018-12-19 01:18:04 +08:00
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specs/core/0_beacon-chain.md
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@ -1125,8 +1125,7 @@ A valid block with slot `INITIAL_SLOT_NUMBER` (a "genesis block") has the follow
`STARTUP_STATE_ROOT` (in the above "genesis block") is generated from the `get_initial_beacon_state` function below. When enough full deposits have been made to the deposit contract and the `ChainStart` log has been emitted, `get_initial_beacon_state` will execute to compute the `hash_tree_root` of `BeaconState`. `STARTUP_STATE_ROOT` (in the above "genesis block") is generated from the `get_initial_beacon_state` function below. When enough full deposits have been made to the deposit contract and the `ChainStart` log has been emitted, `get_initial_beacon_state` will execute to compute the `hash_tree_root` of `BeaconState`.
```python ```python
def get_initial_beacon_state(initial_validator_registry: List[ValidatorRecord], def get_initial_beacon_state(initial_validator_deposits: List[Deposit],
initial_validator_deposits: List[Deposit],
genesis_time: int, genesis_time: int,
processed_pow_receipt_root: Hash32) -> BeaconState: processed_pow_receipt_root: Hash32) -> BeaconState:
state = BeaconState( state = BeaconState(
@ -1184,7 +1183,7 @@ def get_initial_beacon_state(initial_validator_registry: List[ValidatorRecord],
update_validator_status(state, validator_index, ACTIVE) update_validator_status(state, validator_index, ACTIVE)
# set initial committee shuffling # set initial committee shuffling
initial_shuffling = get_new_shuffling(ZERO_HASH, initial_validator_registry, 0) initial_shuffling = get_new_shuffling(ZERO_HASH, state.validator_registry, 0)
state.shard_committees_at_slots = initial_shuffling + initial_shuffling state.shard_committees_at_slots = initial_shuffling + initial_shuffling
# set initial persistent shuffling # set initial persistent shuffling
@ -1196,7 +1195,7 @@ def get_initial_beacon_state(initial_validator_registry: List[ValidatorRecord],
### Routine for processing deposits ### Routine for processing deposits
First, a helper function: First, two helper functions:
```python ```python
def min_empty_validator_index(validators: List[ValidatorRecord], current_slot: int) -> int: def min_empty_validator_index(validators: List[ValidatorRecord], current_slot: int) -> int:
@ -1206,6 +1205,31 @@ def min_empty_validator_index(validators: List[ValidatorRecord], current_slot: i
return None return None
``` ```
```python
def validate_proof_of_possession(state: BeaconState,
pubkey: int,
proof_of_possession: bytes,
withdrawal_credentials: Hash32,
randao_commitment: Hash32) -> bool:
proof_of_possession_data = DepositInput(
pubkey=pubkey,
withdrawal_credentials=withdrawal_credentials,
randao_commitment=randao_commitment,
proof_of_possession=EMPTY_SIGNATURE,
)
return bls_verify(
pubkey=pubkey,
message=hash_tree_root(proof_of_possession_data),
signature=proof_of_possession,
domain=get_domain(
state.fork_data,
state.slot,
DOMAIN_DEPOSIT,
)
)
```
Now, to add a [validator](#dfn-validator) or top up an existing [validator](#dfn-validator)'s balance by some `deposit` amount: Now, to add a [validator](#dfn-validator) or top up an existing [validator](#dfn-validator)'s balance by some `deposit` amount:
```python ```python
@ -1219,23 +1243,15 @@ def process_deposit(state: BeaconState,
Process a deposit from Ethereum 1.0. Process a deposit from Ethereum 1.0.
Note that this function mutates ``state``. Note that this function mutates ``state``.
""" """
deposit_input = DepositInput( # Validate the given `proof_of_possession`
pubkey=pubkey, assert validate_proof_of_possession(
withdrawal_credentials=withdrawal_credentials, state,
randao_commitment=randao_commitment, pubkey,
proof_of_possession=EMPTY_SIGNATURE, proof_of_possession,
withdrawal_credentials,
randao_commitment,
) )
assert bls_verify(
pubkey=pubkey,
message=hash_tree_root(deposit_input),
signature=proof_of_possession,
domain=get_domain(
state.fork_data,
state.slot,
DOMAIN_DEPOSIT
)
)
validator_pubkeys = [v.pubkey for v in state.validator_registry] validator_pubkeys = [v.pubkey for v in state.validator_registry]
if pubkey not in validator_pubkeys: if pubkey not in validator_pubkeys: