blocks

package
v3.0.0-rc.0 Latest Latest
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 Go to latest Published: Aug 19, 2022 License: GPL-3.0 Imports: 35 Imported by: 2

Documentation

Overview

Package blocks contains block processing libraries according to the Ethereum beacon chain spec.

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrInvalidPayloadBlockHash  = errors.New("invalid payload block hash")
	ErrInvalidPayloadTimeStamp  = errors.New("invalid payload timestamp")
	ErrInvalidPayloadPrevRandao = errors.New("invalid payload previous randao")
)
View Source 
var ValidatorAlreadyExitedMsg = "has already submitted an exit, which will take place at epoch"

ValidatorAlreadyExitedMsg defines a message saying that a validator has already exited.

View Source 
var ValidatorCannotExitYetMsg = "validator has not been active long enough to exit"

ValidatorCannotExitYetMsg defines a message saying that a validator cannot exit because it has not been active long enough.

Functions

func ActivateValidatorWithEffectiveBalance 

func ActivateValidatorWithEffectiveBalance(beaconState state.BeaconState, deposits []*ethpb.Deposit) (state.BeaconState, error)

ActivateValidatorWithEffectiveBalance updates validator's effective balance, and if it's above MaxEffectiveBalance, validator becomes active in genesis.

func AreEth1DataEqual 

func AreEth1DataEqual(a, b *ethpb.Eth1Data) bool

AreEth1DataEqual checks equality between two eth1 data objects.

func AttestationSignatureBatch 

func AttestationSignatureBatch(ctx context.Context, beaconState state.ReadOnlyBeaconState, atts []*ethpb.Attestation) (*bls.SignatureBatch, error)

AttestationSignatureBatch retrieves all the related attestation signature data such as the relevant public keys, signatures and attestation signing data and collate it into a signature batch object.

func BatchVerifyDepositsSignatures 

func BatchVerifyDepositsSignatures(ctx context.Context, deposits []*ethpb.Deposit) (bool, error)

BatchVerifyDepositsSignatures batch verifies deposit signatures.

func BlockSignatureBatch 

func BlockSignatureBatch(beaconState state.ReadOnlyBeaconState,
	proposerIndex types.ValidatorIndex,
	sig []byte,
	rootFunc func() ([32]byte, error)) (*bls.SignatureBatch, error)

BlockSignatureBatch retrieves the block signature batch from the provided block and its corresponding state.

func Eth1DataHasEnoughSupport 

func Eth1DataHasEnoughSupport(beaconState state.ReadOnlyBeaconState, data *ethpb.Eth1Data) (bool, error)

Eth1DataHasEnoughSupport returns true when the given eth1data has more than 50% votes in the eth1 voting period. A vote is cast by including eth1data in a block and part of state processing appends eth1data to the state in the Eth1DataVotes list. Iterating through this list checks the votes to see if they match the eth1data.

func GetBlockPayloadHash 

func GetBlockPayloadHash(blk interfaces.BeaconBlock) ([32]byte, error)

GetBlockPayloadHash returns the hash of the execution payload of the block

func IsExecutionBlock 

func IsExecutionBlock(body interfaces.BeaconBlockBody) (bool, error)

IsExecutionBlock returns whether the block has a non-empty ExecutionPayload.

Spec code: def is_execution_block(block: BeaconBlock) -> bool: 

return block.body.execution_payload != ExecutionPayload()

func IsExecutionEnabled 

func IsExecutionEnabled(st state.BeaconState, body interfaces.BeaconBlockBody) (bool, error)

IsExecutionEnabled returns true if the beacon chain can begin executing. Meaning the payload header is beacon state is non-empty or the payload in block body is non-empty.

Spec code: def is_execution_enabled(state: BeaconState, body: BeaconBlockBody) -> bool: 

return is_merge_block(state, body) or is_merge_complete(state)

func IsExecutionEnabledUsingHeader 

func IsExecutionEnabledUsingHeader(header *enginev1.ExecutionPayloadHeader, body interfaces.BeaconBlockBody) (bool, error)

IsExecutionEnabledUsingHeader returns true if the execution is enabled using post processed payload header and block body. This is an optimized version of IsExecutionEnabled where beacon state is not required as an argument.

func IsMergeTransitionComplete 

func IsMergeTransitionComplete(st state.BeaconState) (bool, error)

IsMergeTransitionComplete returns true if the transition to Bellatrix has completed. Meaning the payload header in beacon state is not `ExecutionPayloadHeader()` (i.e. not empty).

Spec code: def is_merge_transition_complete(state: BeaconState) -> bool: 

return state.latest_execution_payload_header != ExecutionPayloadHeader()

func IsPreBellatrixVersion 

func IsPreBellatrixVersion(v int) bool

IsPreBellatrixVersion returns true if input version is before bellatrix fork.

func IsSlashableAttestationData 

func IsSlashableAttestationData(data1, data2 *ethpb.AttestationData) bool

IsSlashableAttestationData verifies a slashing against the Casper Proof of Stake FFG rules.

Spec pseudocode definition: 

def is_slashable_attestation_data(data_1: AttestationData, data_2: AttestationData) -> bool:
 """
 Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG rules.
 """
 return (
     # Double vote
     (data_1 != data_2 and data_1.target.epoch == data_2.target.epoch) or
     # Surround vote
     (data_1.source.epoch < data_2.source.epoch and data_2.target.epoch < data_1.target.epoch)
 )

func NewGenesisBlock 

func NewGenesisBlock(stateRoot []byte) *ethpb.SignedBeaconBlock

NewGenesisBlock returns the canonical, genesis block for the beacon chain protocol.

func ProcessAttestationNoVerifySignature 

func ProcessAttestationNoVerifySignature(
	ctx context.Context,
	beaconState state.BeaconState,
	att *ethpb.Attestation,
) (state.BeaconState, error)

ProcessAttestationNoVerifySignature processes the attestation without verifying the attestation signature. This method is used to validate attestations whose signatures have already been verified.

func ProcessAttestationsNoVerifySignature 

func ProcessAttestationsNoVerifySignature(
	ctx context.Context,
	beaconState state.BeaconState,
	b interfaces.SignedBeaconBlock,
) (state.BeaconState, error)

ProcessAttestationsNoVerifySignature applies processing operations to a block's inner attestation records. The only difference would be that the attestation signature would not be verified.

func ProcessAttesterSlashing 

func ProcessAttesterSlashing(
	ctx context.Context,
	beaconState state.BeaconState,
	slashing *ethpb.AttesterSlashing,
	slashFunc slashValidatorFunc,
) (state.BeaconState, error)

ProcessAttesterSlashing processes individual attester slashing.

func ProcessAttesterSlashings 

func ProcessAttesterSlashings(
	ctx context.Context,
	beaconState state.BeaconState,
	slashings []*ethpb.AttesterSlashing,
	slashFunc slashValidatorFunc,
) (state.BeaconState, error)

ProcessAttesterSlashings is one of the operations performed on each processed beacon block to slash attesters based on Casper FFG slashing conditions if any slashable events occurred.

Spec pseudocode definition: 

def process_attester_slashing(state: BeaconState, attester_slashing: AttesterSlashing) -> None:
 attestation_1 = attester_slashing.attestation_1
 attestation_2 = attester_slashing.attestation_2
 assert is_slashable_attestation_data(attestation_1.data, attestation_2.data)
 assert is_valid_indexed_attestation(state, attestation_1)
 assert is_valid_indexed_attestation(state, attestation_2)

 slashed_any = False
 indices = set(attestation_1.attesting_indices).intersection(attestation_2.attesting_indices)
 for index in sorted(indices):
     if is_slashable_validator(state.validators[index], get_current_epoch(state)):
         slash_validator(state, index)
         slashed_any = True
 assert slashed_any

func ProcessBLSToExecutionChange 

func ProcessBLSToExecutionChange(st state.BeaconState, signed *ethpb.SignedBLSToExecutionChange) (state.BeaconState, error)

ProcessBLSToExecutionChange validates a SignedBLSToExecution message and changes the validator's withdrawal address accordingly.

Spec pseudocode definition:

def process_bls_to_execution_change(state: BeaconState, signed_address_change: SignedBLSToExecutionChange) -> None: 

validator = state.validators[address_change.validator_index]

assert validator.withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX
assert validator.withdrawal_credentials[1:] == hash(address_change.from_bls_pubkey)[1:]

domain = get_domain(state, DOMAIN_BLS_TO_EXECUTION_CHANGE)
signing_root = compute_signing_root(address_change, domain)
assert bls.Verify(address_change.from_bls_pubkey, signing_root, signed_address_change.signature)

validator.withdrawal_credentials = (
    ETH1_ADDRESS_WITHDRAWAL_PREFIX
    + b'\x00' * 11
    + address_change.to_execution_address
)

func ProcessBlockHeader 

func ProcessBlockHeader(
	ctx context.Context,
	beaconState state.BeaconState,
	block interfaces.SignedBeaconBlock,
) (state.BeaconState, error)

ProcessBlockHeader validates a block by its header.

Spec pseudocode definition: 

def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
  # Verify that the slots match
  assert block.slot == state.slot
  # Verify that the block is newer than latest block header
  assert block.slot > state.latest_block_header.slot
  # Verify that proposer index is the correct index
  assert block.proposer_index == get_beacon_proposer_index(state)
  # Verify that the parent matches
  assert block.parent_root == hash_tree_root(state.latest_block_header)
  # Cache current block as the new latest block
  state.latest_block_header = BeaconBlockHeader(
      slot=block.slot,
      proposer_index=block.proposer_index,
      parent_root=block.parent_root,
      state_root=Bytes32(),  # Overwritten in the next process_slot call
      body_root=hash_tree_root(block.body),
  )

  # Verify proposer is not slashed
  proposer = state.validators[block.proposer_index]
  assert not proposer.slashed

func ProcessBlockHeaderNoVerify 

func ProcessBlockHeaderNoVerify(
	ctx context.Context,
	beaconState state.BeaconState,
	slot types.Slot, proposerIndex types.ValidatorIndex,
	parentRoot, bodyRoot []byte,
) (state.BeaconState, error)

ProcessBlockHeaderNoVerify validates a block by its header but skips proposer signature verification.

WARNING: This method does not verify proposer signature. This is used for proposer to compute state root using a unsigned block.

Spec pseudocode definition: 

def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
  # Verify that the slots match
  assert block.slot == state.slot
  # Verify that the block is newer than latest block header
  assert block.slot > state.latest_block_header.slot
  # Verify that proposer index is the correct index
  assert block.proposer_index == get_beacon_proposer_index(state)
  # Verify that the parent matches
  assert block.parent_root == hash_tree_root(state.latest_block_header)
  # Cache current block as the new latest block
  state.latest_block_header = BeaconBlockHeader(
      slot=block.slot,
      proposer_index=block.proposer_index,
      parent_root=block.parent_root,
      state_root=Bytes32(),  # Overwritten in the next process_slot call
      body_root=hash_tree_root(block.body),
  )

  # Verify proposer is not slashed
  proposer = state.validators[block.proposer_index]
  assert not proposer.slashed

func ProcessDeposit 

func ProcessDeposit(beaconState state.BeaconState, deposit *ethpb.Deposit, verifySignature bool) (state.BeaconState, bool, error)

ProcessDeposit takes in a deposit object and inserts it into the registry as a new validator or balance change. Returns the resulting state, a boolean to indicate whether or not the deposit resulted in a new validator entry into the beacon state, and any error.

Spec pseudocode definition: def process_deposit(state: BeaconState, deposit: Deposit) -> None: 

# Verify the Merkle branch
assert is_valid_merkle_branch(
    leaf=hash_tree_root(deposit.data),
    branch=deposit.proof,
    depth=DEPOSIT_CONTRACT_TREE_DEPTH + 1,  # Add 1 for the List length mix-in
    index=state.eth1_deposit_index,
    root=state.eth1_data.deposit_root,
)

# Deposits must be processed in order
state.eth1_deposit_index += 1

pubkey = deposit.data.pubkey
amount = deposit.data.amount
validator_pubkeys = [v.pubkey for v in state.validators]
if pubkey not in validator_pubkeys:
    # Verify the deposit signature (proof of possession) which is not checked by the deposit contract
    deposit_message = DepositMessage(
        pubkey=deposit.data.pubkey,
        withdrawal_credentials=deposit.data.withdrawal_credentials,
        amount=deposit.data.amount,
    )
    domain = compute_domain(DOMAIN_DEPOSIT)  # Fork-agnostic domain since deposits are valid across forks
    signing_root = compute_signing_root(deposit_message, domain)
    if not bls.Verify(pubkey, signing_root, deposit.data.signature):
        return

    # Add validator and balance entries
    state.validators.append(get_validator_from_deposit(state, deposit))
    state.balances.append(amount)
else:
    # Increase balance by deposit amount
    index = ValidatorIndex(validator_pubkeys.index(pubkey))
    increase_balance(state, index, amount)

func ProcessDeposits 

func ProcessDeposits(
	ctx context.Context,
	beaconState state.BeaconState,
	deposits []*ethpb.Deposit,
) (state.BeaconState, error)

ProcessDeposits is one of the operations performed on each processed beacon block to verify queued validators from the Ethereum 1.0 Deposit Contract into the beacon chain.

Spec pseudocode definition: 

For each deposit in block.body.deposits:
  process_deposit(state, deposit)

func ProcessEth1DataInBlock 

func ProcessEth1DataInBlock(_ context.Context, beaconState state.BeaconState, eth1Data *ethpb.Eth1Data) (state.BeaconState, error)

ProcessEth1DataInBlock is an operation performed on each beacon block to ensure the ETH1 data votes are processed into the beacon state.

Official spec definition: 

def process_eth1_data(state: BeaconState, body: BeaconBlockBody) -> None:
 state.eth1_data_votes.append(body.eth1_data)
 if state.eth1_data_votes.count(body.eth1_data) * 2 > EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH:
     state.eth1_data = body.eth1_data

func ProcessPayload 

func ProcessPayload(st state.BeaconState, payload interfaces.ExecutionData) (state.BeaconState, error)

ProcessPayload processes input execution payload using beacon state. ValidatePayloadWhenMergeCompletes validates if payload is valid versus input beacon state. These validation steps ONLY apply to post merge.

Spec code: def process_execution_payload(state: BeaconState, payload: ExecutionPayload, execution_engine: ExecutionEngine) -> None: 

# Verify consistency of the parent hash with respect to the previous execution payload header
if is_merge_complete(state):
    assert payload.parent_hash == state.latest_execution_payload_header.block_hash
# Verify random
assert payload.random == get_randao_mix(state, get_current_epoch(state))
# Verify timestamp
assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
# Verify the execution payload is valid
assert execution_engine.execute_payload(payload)
# Cache execution payload header
state.latest_execution_payload_header = ExecutionPayloadHeader(
    parent_hash=payload.parent_hash,
    FeeRecipient=payload.FeeRecipient,
    state_root=payload.state_root,
    receipt_root=payload.receipt_root,
    logs_bloom=payload.logs_bloom,
    random=payload.random,
    block_number=payload.block_number,
    gas_limit=payload.gas_limit,
    gas_used=payload.gas_used,
    timestamp=payload.timestamp,
    extra_data=payload.extra_data,
    base_fee_per_gas=payload.base_fee_per_gas,
    block_hash=payload.block_hash,
    transactions_root=hash_tree_root(payload.transactions),
)

func ProcessPayloadHeader 

func ProcessPayloadHeader(st state.BeaconState, header interfaces.ExecutionData) (state.BeaconState, error)

ProcessPayloadHeader processes the payload header.

func ProcessPreGenesisDeposits 

func ProcessPreGenesisDeposits(
	ctx context.Context,
	beaconState state.BeaconState,
	deposits []*ethpb.Deposit,
) (state.BeaconState, error)

ProcessPreGenesisDeposits processes a deposit for the beacon state before chainstart.

func ProcessProposerSlashing 

func ProcessProposerSlashing(
	ctx context.Context,
	beaconState state.BeaconState,
	slashing *ethpb.ProposerSlashing,
	slashFunc slashValidatorFunc,
) (state.BeaconState, error)

ProcessProposerSlashing processes individual proposer slashing.

func ProcessProposerSlashings 

func ProcessProposerSlashings(
	ctx context.Context,
	beaconState state.BeaconState,
	slashings []*ethpb.ProposerSlashing,
	slashFunc slashValidatorFunc,
) (state.BeaconState, error)

ProcessProposerSlashings is one of the operations performed on each processed beacon block to slash proposers based on slashing conditions if any slashable events occurred.

Spec pseudocode definition: 

def process_proposer_slashing(state: BeaconState, proposer_slashing: ProposerSlashing) -> None:
 header_1 = proposer_slashing.signed_header_1.message
 header_2 = proposer_slashing.signed_header_2.message

 # Verify header slots match
 assert header_1.slot == header_2.slot
 # Verify header proposer indices match
 assert header_1.proposer_index == header_2.proposer_index
 # Verify the headers are different
 assert header_1 != header_2
 # Verify the proposer is slashable
 proposer = state.validators[header_1.proposer_index]
 assert is_slashable_validator(proposer, get_current_epoch(state))
 # Verify signatures
 for signed_header in (proposer_slashing.signed_header_1, proposer_slashing.signed_header_2):
     domain = get_domain(state, DOMAIN_BEACON_PROPOSER, compute_epoch_at_slot(signed_header.message.slot))
     signing_root = compute_signing_root(signed_header.message, domain)
     assert bls.Verify(proposer.pubkey, signing_root, signed_header.signature)

 slash_validator(state, header_1.proposer_index)

func ProcessRandao 

func ProcessRandao(
	ctx context.Context,
	beaconState state.BeaconState,
	b interfaces.SignedBeaconBlock,
) (state.BeaconState, error)

ProcessRandao checks the block proposer's randao commitment and generates a new randao mix to update in the beacon state's latest randao mixes slice.

Spec pseudocode definition: 

def process_randao(state: BeaconState, body: BeaconBlockBody) -> None:
 epoch = get_current_epoch(state)
 # Verify RANDAO reveal
 proposer = state.validators[get_beacon_proposer_index(state)]
 signing_root = compute_signing_root(epoch, get_domain(state, DOMAIN_RANDAO))
 assert bls.Verify(proposer.pubkey, signing_root, body.randao_reveal)
 # Mix in RANDAO reveal
 mix = xor(get_randao_mix(state, epoch), hash(body.randao_reveal))
 state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR] = mix

func ProcessRandaoNoVerify 

func ProcessRandaoNoVerify(
	beaconState state.BeaconState,
	randaoReveal []byte,
) (state.BeaconState, error)

ProcessRandaoNoVerify generates a new randao mix to update in the beacon state's latest randao mixes slice.

Spec pseudocode definition: 

# Mix it in
state.latest_randao_mixes[get_current_epoch(state) % LATEST_RANDAO_MIXES_LENGTH] = (
    xor(get_randao_mix(state, get_current_epoch(state)),
        hash(body.randao_reveal))
)

func ProcessVoluntaryExits 

func ProcessVoluntaryExits(
	ctx context.Context,
	beaconState state.BeaconState,
	exits []*ethpb.SignedVoluntaryExit,
) (state.BeaconState, error)

ProcessVoluntaryExits is one of the operations performed on each processed beacon block to determine which validators should exit the state's validator registry.

Spec pseudocode definition: 

def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
 voluntary_exit = signed_voluntary_exit.message
 validator = state.validators[voluntary_exit.validator_index]
 # Verify the validator is active
 assert is_active_validator(validator, get_current_epoch(state))
 # Verify exit has not been initiated
 assert validator.exit_epoch == FAR_FUTURE_EPOCH
 # Exits must specify an epoch when they become valid; they are not valid before then
 assert get_current_epoch(state) >= voluntary_exit.epoch
 # Verify the validator has been active long enough
 assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
 # Verify signature
 domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
 signing_root = compute_signing_root(voluntary_exit, domain)
 assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
 # Initiate exit
 initiate_validator_exit(state, voluntary_exit.validator_index)

func RandaoSignatureBatch 

func RandaoSignatureBatch(
	ctx context.Context,
	beaconState state.ReadOnlyBeaconState,
	reveal []byte,
) (*bls.SignatureBatch, error)

RandaoSignatureBatch retrieves the relevant randao specific signature batch object from a block and its corresponding state.

func SlashableAttesterIndices 

func SlashableAttesterIndices(slashing *ethpb.AttesterSlashing) []uint64

SlashableAttesterIndices returns the intersection of attester indices from both attestations in this slashing.

func ValidatePayload 

func ValidatePayload(st state.BeaconState, payload interfaces.ExecutionData) error

ValidatePayload validates if payload is valid versus input beacon state. These validation steps apply to both pre merge and post merge.

Spec code: 

# Verify random
assert payload.random == get_randao_mix(state, get_current_epoch(state))
# Verify timestamp
assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)

func ValidatePayloadHeader 

func ValidatePayloadHeader(st state.BeaconState, header interfaces.ExecutionData) error

ValidatePayloadHeader validates the payload header.

func ValidatePayloadHeaderWhenMergeCompletes 

func ValidatePayloadHeaderWhenMergeCompletes(st state.BeaconState, header interfaces.ExecutionData) error

ValidatePayloadHeaderWhenMergeCompletes validates the payload header when the merge completes.

func ValidatePayloadWhenMergeCompletes 

func ValidatePayloadWhenMergeCompletes(st state.BeaconState, payload interfaces.ExecutionData) error

ValidatePayloadWhenMergeCompletes validates if payload is valid versus input beacon state. These validation steps ONLY apply to post merge.

Spec code: 

# Verify consistency of the parent hash with respect to the previous execution payload header
if is_merge_complete(state):
    assert payload.parent_hash == state.latest_execution_payload_header.block_hash

func VerifyAttestationNoVerifySignature 

func VerifyAttestationNoVerifySignature(
	ctx context.Context,
	beaconState state.ReadOnlyBeaconState,
	att *ethpb.Attestation,
) error

VerifyAttestationNoVerifySignature verifies the attestation without verifying the attestation signature. This is used before processing attestation with the beacon state.

func VerifyAttestationSignature 

func VerifyAttestationSignature(ctx context.Context, beaconState state.ReadOnlyBeaconState, att *ethpb.Attestation) error

VerifyAttestationSignature converts and attestation into an indexed attestation and verifies the signature in that attestation.

func VerifyAttesterSlashing 

func VerifyAttesterSlashing(ctx context.Context, beaconState state.ReadOnlyBeaconState, slashing *ethpb.AttesterSlashing) error

VerifyAttesterSlashing validates the attestation data in both attestations in the slashing object.

func VerifyBlockHeaderSignature 

func VerifyBlockHeaderSignature(beaconState state.BeaconState, header *ethpb.SignedBeaconBlockHeader) error

VerifyBlockHeaderSignature verifies the proposer signature of a beacon block header.

func VerifyBlockSignature 

func VerifyBlockSignature(beaconState state.ReadOnlyBeaconState,
	proposerIndex types.ValidatorIndex,
	sig []byte,
	rootFunc func() ([32]byte, error)) error

VerifyBlockSignature verifies the proposer signature of a beacon block.

func VerifyBlockSignatureUsingCurrentFork 

func VerifyBlockSignatureUsingCurrentFork(beaconState state.ReadOnlyBeaconState, blk interfaces.SignedBeaconBlock) error

VerifyBlockSignatureUsingCurrentFork verifies the proposer signature of a beacon block. This differs from the above method by not using fork data from the state and instead retrieving it via the respective epoch.

func VerifyExitAndSignature 

func VerifyExitAndSignature(
	validator state.ReadOnlyValidator,
	currentSlot types.Slot,
	fork *ethpb.Fork,
	signed *ethpb.SignedVoluntaryExit,
	genesisRoot []byte,
) error

VerifyExitAndSignature implements the spec defined validation for voluntary exits.

Spec pseudocode definition: 

def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
 voluntary_exit = signed_voluntary_exit.message
 validator = state.validators[voluntary_exit.validator_index]
 # Verify the validator is active
 assert is_active_validator(validator, get_current_epoch(state))
 # Verify exit has not been initiated
 assert validator.exit_epoch == FAR_FUTURE_EPOCH
 # Exits must specify an epoch when they become valid; they are not valid before then
 assert get_current_epoch(state) >= voluntary_exit.epoch
 # Verify the validator has been active long enough
 assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
 # Verify signature
 domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
 signing_root = compute_signing_root(voluntary_exit, domain)
 assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
 # Initiate exit
 initiate_validator_exit(state, voluntary_exit.validator_index)

func VerifyIndexedAttestation 

func VerifyIndexedAttestation(ctx context.Context, beaconState state.ReadOnlyBeaconState, indexedAtt *ethpb.IndexedAttestation) error

VerifyIndexedAttestation determines the validity of an indexed attestation.

Spec pseudocode definition: 

def is_valid_indexed_attestation(state: BeaconState, indexed_attestation: IndexedAttestation) -> bool:
  """
  Check if ``indexed_attestation`` is not empty, has sorted and unique indices and has a valid aggregate signature.
  """
  # Verify indices are sorted and unique
  indices = indexed_attestation.attesting_indices
  if len(indices) == 0 or not indices == sorted(set(indices)):
      return False
  # Verify aggregate signature
  pubkeys = [state.validators[i].pubkey for i in indices]
  domain = get_domain(state, DOMAIN_BEACON_ATTESTER, indexed_attestation.data.target.epoch)
  signing_root = compute_signing_root(indexed_attestation.data, domain)
  return bls.FastAggregateVerify(pubkeys, signing_root, indexed_attestation.signature)

func VerifyProposerSlashing 

func VerifyProposerSlashing(
	beaconState state.ReadOnlyBeaconState,
	slashing *ethpb.ProposerSlashing,
) error

VerifyProposerSlashing verifies that the data provided from slashing is valid.

Types

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