def test_chaindb_get_score(chaindb):
genesis = BlockHeader(difficulty=1, block_number=0, gas_limit=0)
chaindb.persist_header(genesis)
genesis_score_key = SchemaV1.make_block_hash_to_score_lookup_key(
genesis.hash)
genesis_score = rlp.decode(chaindb.db.get(genesis_score_key),
sedes=rlp.sedes.big_endian_int)
assert genesis_score == 1
assert chaindb.get_score(genesis.hash) == 1
block1 = BlockHeader(
difficulty=10,
block_number=1,
gas_limit=0,
parent_hash=genesis.hash,
timestamp=genesis.timestamp + 1,
)
chaindb.persist_header(block1)
block1_score_key = SchemaV1.make_block_hash_to_score_lookup_key(
block1.hash)
block1_score = rlp.decode(chaindb.db.get(block1_score_key),
sedes=rlp.sedes.big_endian_int)
assert block1_score == 11
assert chaindb.get_score(block1.hash) == 11
def from_genesis(cls,
base_db: AtomicDatabaseAPI,
genesis_params: Dict[str, HeaderParams],
genesis_state: AccountState=None) -> 'BaseChain':
genesis_vm_class = cls.get_vm_class_for_block_number(BlockNumber(0))
pre_genesis_header = BlockHeader(difficulty=0, block_number=-1, gas_limit=0)
chain_context = ChainContext(cls.chain_id)
state = genesis_vm_class.build_state(base_db, pre_genesis_header, chain_context)
if genesis_state is None:
genesis_state = {}
# mutation
apply_state_dict(state, genesis_state)
state.persist()
if 'state_root' not in genesis_params:
# If the genesis state_root was not specified, use the value
# computed from the initialized state database.
genesis_params = assoc(genesis_params, 'state_root', state.state_root)
elif genesis_params['state_root'] != state.state_root:
# If the genesis state_root was specified, validate that it matches
# the computed state from the initialized state database.
raise ValidationError(
"The provided genesis state root does not match the computed "
f"genesis state root. Got {state.state_root!r}. "
f"Expected {genesis_params['state_root']!r}"
)
genesis_header = BlockHeader(**genesis_params)
return cls.from_genesis_header(base_db, genesis_header)
def set_vm(self, block_identifier='latest'):
_block = None
if self.w3:
if block_identifier == 'latest':
block_identifier = self.w3.eth.blockNumber
validate_uint256(block_identifier)
_block = self.w3.eth.getBlock(block_identifier)
if not _block:
if block_identifier in [
HOMESTEAD_MAINNET_BLOCK, BYZANTIUM_MAINNET_BLOCK,
PETERSBURG_MAINNET_BLOCK
]:
_block = self.get_cached_block_by_id(block_identifier)
else:
self.logger.error("Unknown block identifier.")
sys.exit(-4)
block_header = BlockHeader(
difficulty=_block.difficulty,
block_number=_block.number,
gas_limit=_block.gasLimit,
timestamp=_block.timestamp,
coinbase=ZERO_ADDRESS, # default value
parent_hash=_block.parentHash,
uncles_hash=_block.uncles,
state_root=_block.stateRoot,
transaction_root=_block.transactionsRoot,
receipt_root=_block.receiptsRoot,
bloom=0, # default value
gas_used=_block.gasUsed,
extra_data=_block.extraData,
mix_hash=_block.mixHash,
nonce=_block.nonce)
self.vm = self.chain.get_vm(block_header)
def generate_header_from_parent_header(compute_difficulty_fn: Callable[
[BlockHeader, int], int],
parent_header: BlockHeader,
coinbase: Address,
timestamp: Optional[int] = None,
extra_data: bytes = b'') -> BlockHeader:
"""
Generate BlockHeader from state_root and parent_header
"""
if timestamp is None:
timestamp = max(int(time.time()), parent_header.timestamp + 1)
elif timestamp <= parent_header.timestamp:
raise ValueError("header.timestamp ({}) should be higher than"
"parent_header.timestamp ({})".format(
timestamp,
parent_header.timestamp,
))
header = BlockHeader(
difficulty=compute_difficulty_fn(parent_header, timestamp),
block_number=(parent_header.block_number + 1),
gas_limit=compute_gas_limit(
parent_header,
gas_limit_floor=GENESIS_GAS_LIMIT,
),
timestamp=timestamp,
parent_hash=parent_header.hash,
state_root=parent_header.state_root,
coinbase=coinbase,
extra_data=extra_data,
)
return header
def mk_uncle(block_number):
return BlockHeader(
state_root=os.urandom(32),
difficulty=1000000,
block_number=block_number,
gas_limit=3141592,
timestamp=int(time.time()),
)
def mk_header_chain(length):
assert length >= 1
genesis = BlockHeader(difficulty=100, block_number=0, gas_limit=3000000)
yield genesis
parent = genesis
if length == 1:
return
for i in range(length - 1):
header = BlockHeader(
difficulty=100,
block_number=parent.block_number + 1,
parent_hash=parent.hash,
gas_limit=3000000,
)
yield header
parent = header
def test_blockchain_fixtures(fixture_data, fixture):
try:
chain = new_chain_from_fixture(fixture)
except ValueError as e:
raise AssertionError("could not load chain for {}".format(
(fixture_data, ))) from e
genesis_params = genesis_params_from_fixture(fixture)
expected_genesis_header = BlockHeader(**genesis_params)
# TODO: find out if this is supposed to pass?
# if 'genesisRLP' in fixture:
# assert rlp.encode(genesis_header) == fixture['genesisRLP']
genesis_block = chain.get_canonical_block_by_number(0)
genesis_header = genesis_block.header
assert_imported_genesis_header_unchanged(expected_genesis_header,
genesis_header)
# 1 - mine the genesis block
# 2 - loop over blocks:
# - apply transactions
# - mine block
# 3 - diff resulting state with expected state
# 4 - check that all previous blocks were valid
for block_fixture in fixture['blocks']:
should_be_good_block = 'blockHeader' in block_fixture
if 'rlp_error' in block_fixture:
assert not should_be_good_block
continue
if should_be_good_block:
(block, mined_block, block_rlp) = apply_fixture_block_to_chain(
block_fixture,
chain,
perform_validation=False # we manually validate below
)
assert_mined_block_unchanged(block, mined_block)
chain.validate_block(block)
else:
try:
apply_fixture_block_to_chain(block_fixture, chain)
except (TypeError, rlp.DecodingError, rlp.DeserializationError,
ValidationError) as err:
# failure is expected on this bad block
pass
else:
raise AssertionError(
"Block should have caused a validation error")
latest_block_hash = chain.get_canonical_block_by_number(
chain.get_block().number - 1).hash
if latest_block_hash != fixture['lastblockhash']:
verify_account_db(fixture['postState'],
chain.get_vm().state.account_db)
def instantiate_vm(vm_class):
GENESIS_HEADER = BlockHeader(
difficulty=17179869184,
block_number=BlockNumber(0),
gas_limit=5000,
)
chain_context = ChainContext(None)
db = AtomicDB()
return vm_class(GENESIS_HEADER, ChainDB(db), chain_context, ConsensusContext(db))
def add_receipt_to_header(self, old_header: BlockHeader,
receipt: Receipt) -> BlockHeader:
# Skip merkelizing the account data and persisting it to disk on every transaction.
# Starting in Byzantium, this is no longer necessary, because the state root isn't
# in the receipt anymore.
return old_header.copy(
bloom=int(BloomFilter(old_header.bloom) | receipt.bloom),
gas_used=receipt.gas_used,
)
def test_headerdb_persist_header_disallows_unknown_parent(headerdb):
header = BlockHeader(
difficulty=GENESIS_DIFFICULTY,
block_number=GENESIS_BLOCK_NUMBER,
gas_limit=GENESIS_GAS_LIMIT,
parent_hash=b'\x0f' * 32,
)
with pytest.raises(ParentNotFound, match="unknown parent"):
headerdb.persist_header(header)
def deserialize(cls, encoded: List[bytes]) -> BlockHeaderAPI:
num_fields = len(encoded)
if num_fields == 16:
return LondonBlockHeader.deserialize(encoded)
elif num_fields == 15:
return BlockHeader.deserialize(encoded)
else:
raise ValueError(
"London & earlier can only handle headers of 15 or 16 fields. "
f"Got {num_fields} in {encoded!r}")
def mk_header_and_receipts(block_number, num_receipts):
receipts = mk_receipts(num_receipts)
root_hash, trie_root_and_data = make_trie_root_and_nodes(receipts)
header = BlockHeader(
difficulty=1000000,
block_number=block_number,
gas_limit=3141592,
timestamp=int(time.time()),
receipt_root=root_hash,
)
return header, receipts, (root_hash, trie_root_and_data)
def mk_header_chain(base_header, length):
previous_header = base_header
for _ in range(length):
next_header = BlockHeader.from_parent(
parent=previous_header,
timestamp=previous_header.timestamp + 1,
gas_limit=previous_header.gas_limit,
difficulty=previous_header.difficulty,
extra_data=keccak(random.randint(0, 1e18)),
)
yield next_header
previous_header = next_header
def test_blockchain_fixtures(fixture_data, fixture):
try:
chain = new_chain_from_fixture(fixture)
except ValueError as e:
raise AssertionError("could not load chain for %r" %
fixture_data) from e
genesis_params = genesis_params_from_fixture(fixture)
expected_genesis_header = BlockHeader(**genesis_params)
# TODO: find out if this is supposed to pass?
# if 'genesisRLP' in fixture:
# assert rlp.encode(genesis_header) == fixture['genesisRLP']
genesis_block = chain.get_canonical_block_by_number(0)
genesis_header = genesis_block.header
assert_rlp_equal(genesis_header, expected_genesis_header)
# 1 - mine the genesis block
# 2 - loop over blocks:
# - apply transactions
# - mine block
# 4 - profit!!
for block_fixture in fixture['blocks']:
should_be_good_block = 'blockHeader' in block_fixture
if 'rlp_error' in block_fixture:
assert not should_be_good_block
continue
if should_be_good_block:
(block, mined_block,
block_rlp) = apply_fixture_block_to_chain(block_fixture, chain)
assert_rlp_equal(block, mined_block)
else:
try:
apply_fixture_block_to_chain(block_fixture, chain)
except (TypeError, rlp.DecodingError, rlp.DeserializationError,
ValidationError) as err:
# failure is expected on this bad block
pass
else:
raise AssertionError(
"Block should have caused a validation error")
latest_block_hash = chain.get_canonical_block_by_number(
chain.get_block().number - 1).hash
assert latest_block_hash == fixture['lastblockhash']
verify_account_db(fixture['postState'], chain.get_vm().state.account_db)
def build_state(
cls,
db: BaseAtomicDB,
header: BlockHeader,
previous_hashes: Iterable[Hash32] = ()) -> BaseState:
"""
You probably want `VM().state` instead of this.
Occasionally, you want to build custom state against a particular header and DB,
even if you don't have the VM initialized. This is a convenience method to do that.
"""
execution_context = header.create_execution_context(previous_hashes)
return cls.get_state_class()(db, execution_context, header.state_root)
def __init__(self, vm_class):
header = BlockHeader(
difficulty=1,
gas_limit=8000000,
gas_used=0,
bloom=0,
mix_hash=constants.ZERO_HASH32,
nonce=constants.GENESIS_NONCE,
block_number=0,
parent_hash=constants.ZERO_HASH32,
receipt_root=constants.BLANK_ROOT_HASH,
uncles_hash=constants.EMPTY_UNCLE_HASH,
timestamp=0,
transaction_root=constants.BLANK_ROOT_HASH,
)
self.vm = vm_class(header, ChainDB(AtomicDB()))
async def preview_transactions(self,
header: BlockHeader,
transactions: Tuple[BaseTransaction, ...],
parent_state_root: Hash32,
lagging: bool = True) -> None:
self.run_task(
self._preview_address_load(header, parent_state_root,
transactions))
# This is a hack, so that preview executions can load ancestor block-hashes
self._db[header.hash] = rlp.encode(header)
# Always broadcast, to start previewing transactions that are further ahead in the block
old_state_header = header.copy(state_root=parent_state_root)
self._event_bus.broadcast_nowait(
DoStatelessBlockPreview(old_state_header, transactions))
def validate_header(cls,
header: BlockHeader,
parent_header: BlockHeader,
check_seal: bool = True) -> None:
"""
:raise eth.exceptions.ValidationError: if the header is not valid
"""
if parent_header is None:
# to validate genesis header, check if it equals canonical header at block number 0
raise ValidationError(
"Must have access to parent header to validate current header")
else:
validate_length_lte(header.extra_data,
32,
title="BlockHeader.extra_data")
validate_gas_limit(header.gas_limit, parent_header.gas_limit)
if header.block_number != parent_header.block_number + 1:
raise ValidationError(
"Blocks must be numbered consecutively. Block number #{} has parent #{}"
.format(
header.block_number,
parent_header.block_number,
))
# timestamp
if header.timestamp <= parent_header.timestamp:
raise ValidationError(
"timestamp must be strictly later than parent, but is {} seconds before.\n"
"- child : {}\n"
"- parent : {}. ".format(
parent_header.timestamp - header.timestamp,
header.timestamp,
parent_header.timestamp,
))
if check_seal:
try:
cls.validate_seal(header)
except ValidationError:
cls.cls_logger.warning(
"Failed to validate header proof of work on header: %r",
header.as_dict())
raise
def make_next_header(previous_header,
signer_private_key,
coinbase=ZERO_ADDRESS,
nonce=NONCE_DROP,
difficulty=2):
next_header = sign_block_header(
BlockHeader.from_parent(
coinbase=coinbase,
nonce=nonce,
parent=previous_header,
timestamp=previous_header.timestamp + 1,
gas_limit=previous_header.gas_limit,
difficulty=difficulty,
# FIXME: I think our sign_block_header is wrong
extra_data=VANITY_LENGTH * b'0' + SIGNATURE_LENGTH * b'0',
),
signer_private_key)
return next_header
def create_fhe_header_from_parent(parent_header, **header_params):
if 'difficulty' not in header_params:
# Use setdefault to ensure the new header has the same timestamp we use to calculate its
# difficulty.
header_params.setdefault('timestamp', parent_header.timestamp + 1)
header_params['difficulty'] = compute_fhe_difficulty(
parent_header,
header_params['timestamp'],
)
if 'gas_limit' not in header_params:
header_params['gas_limit'] = compute_gas_limit(
parent_header,
gas_limit_floor=GENESIS_GAS_LIMIT,
)
header = BlockHeader.from_parent(parent=parent_header, **header_params)
return header
def test_difficulty_fixtures(fixture):
fork_name = list(fixture.keys())[1]
if fork_name not in VM_FORK_MAP.keys():
raise NotImplementedError(
f'VM_FORK_MAP needs to be updated to support {fork_name}.')
vm = VM_FORK_MAP[fork_name]
fixture_payload = fixture[fork_name].items()
for _, test_payload in fixture_payload:
formatted_test_payload = {
# hexstr -> int for all values in test_payload
k: to_int(hexstr=v)
for k, v in test_payload.items()
}
parent_uncle_hash = (
# 'parentUncles' are either 0 or 1, depending on whether the parent has uncles or not.
# Therefore, use EMPTY_UNCLE_HASH when 0 and non-empty hash when 1.
EMPTY_UNCLE_HASH
if formatted_test_payload['parentUncles'] == 0 else
"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
)
current_block_number = formatted_test_payload['currentBlockNumber']
parent_header = BlockHeader(
difficulty=formatted_test_payload['parentDifficulty'],
block_number=current_block_number - 1,
timestamp=formatted_test_payload['parentTimestamp'],
uncles_hash=parent_uncle_hash,
gas_limit=
0, # necessary for instantiation but arbitrary for this test
)
# calculate the current difficulty using the parent header
difficulty = vm.compute_difficulty(
parent_header=parent_header,
timestamp=formatted_test_payload['currentTimestamp'],
)
assert difficulty == formatted_test_payload['currentDifficulty']
def set_block_transactions(self,
base_block: BaseBlock,
new_header: BlockHeader,
transactions: Tuple[BaseTransaction, ...],
receipts: Tuple[Receipt, ...]) -> BaseBlock:
tx_root_hash, tx_kv_nodes = make_trie_root_and_nodes(transactions)
self.chaindb.persist_trie_data_dict(tx_kv_nodes)
receipt_root_hash, receipt_kv_nodes = make_trie_root_and_nodes(receipts)
self.chaindb.persist_trie_data_dict(receipt_kv_nodes)
return base_block.copy(
transactions=transactions,
header=new_header.copy(
transaction_root=tx_root_hash,
receipt_root=receipt_root_hash,
),
)
def mk_header_and_body(block_number, num_transactions, num_uncles):
transactions = tuple(mk_transaction() for _ in range(num_transactions))
uncles = tuple(mk_uncle(block_number - 1) for _ in range(num_uncles))
transaction_root, trie_data = make_trie_root_and_nodes(transactions)
uncles_hash = keccak(rlp.encode(uncles))
body = BlockBody(transactions=transactions, uncles=uncles)
header = BlockHeader(
difficulty=1000000,
block_number=block_number,
gas_limit=3141592,
timestamp=int(time.time()),
transaction_root=transaction_root,
uncles_hash=uncles_hash,
)
return header, body, transaction_root, trie_data, uncles_hash
def create_frontier_header_from_parent(parent_header: BlockHeaderAPI,
**header_params: Any) -> BlockHeader:
if 'timestamp' not in header_params:
header_params['timestamp'] = new_timestamp_from_parent(parent_header)
if 'difficulty' not in header_params:
# Use setdefault to ensure the new header has the same timestamp we use to calculate its
# difficulty.
header_params['difficulty'] = compute_frontier_difficulty(
parent_header,
header_params['timestamp'],
)
if 'gas_limit' not in header_params:
header_params['gas_limit'] = compute_gas_limit(
parent_header,
genesis_gas_limit=GENESIS_GAS_LIMIT,
)
all_fields = fill_header_params_from_parent(parent_header, **header_params)
return BlockHeader(**all_fields)
def from_genesis(cls,
base_db: BaseDB,
genesis_params: Dict[str, HeaderParams],
genesis_state: AccountState=None) -> 'BaseChain':
"""
Initializes the Chain from a genesis state.
"""
genesis_vm_class = cls.get_vm_class_for_block_number(BlockNumber(0))
account_db = genesis_vm_class.get_state_class().get_account_db_class()(
base_db,
BLANK_ROOT_HASH,
)
if genesis_state is None:
genesis_state = {}
# mutation
apply_state_dict(account_db, genesis_state)
account_db.persist()
if 'state_root' not in genesis_params:
# If the genesis state_root was not specified, use the value
# computed from the initialized state database.
genesis_params = assoc(genesis_params, 'state_root', account_db.state_root)
elif genesis_params['state_root'] != account_db.state_root:
# If the genesis state_root was specified, validate that it matches
# the computed state from the initialized state database.
raise ValidationError(
"The provided genesis state root does not match the computed "
"genesis state root. Got {0}. Expected {1}".format(
account_db.state_root,
genesis_params['state_root'],
)
)
genesis_header = BlockHeader(**genesis_params)
return cls.from_genesis_header(base_db, genesis_header)
def apply_transaction(
self, header: BlockHeader, transaction: BaseTransaction
) -> Tuple[BlockHeader, Receipt, BaseComputation]:
"""
Apply the transaction to the current block. This is a wrapper around
:func:`~eth.vm.state.State.apply_transaction` with some extra orchestration logic.
:param header: header of the block before application
:param transaction: to apply
"""
self.validate_transaction_against_header(header, transaction)
state_root, computation = self.state.apply_transaction(transaction)
receipt = self.make_receipt(header, transaction, computation,
self.state)
self.validate_receipt(receipt)
new_header = header.copy(
bloom=int(BloomFilter(header.bloom) | receipt.bloom),
gas_used=receipt.gas_used,
state_root=state_root,
)
return new_header, receipt, computation
async def preview_transactions(self,
header: BlockHeader,
transactions: Tuple[BaseTransaction, ...],
parent_state_root: Hash32,
lagging: bool = True) -> None:
if not self.manager.is_running:
# If the service is shutting down, we can ignore preview requests
return
self.manager.run_task(self._preview_address_load, header,
parent_state_root, transactions)
# This is a hack, so that preview executions can load ancestor block-hashes
self._db[header.hash] = rlp.encode(header)
# Always broadcast, to start previewing transactions that are further ahead in the block
old_state_header = header.copy(state_root=parent_state_root)
self._event_bus.broadcast_nowait(
DoStatelessBlockPreview(old_state_header, transactions),
FIRE_AND_FORGET_BROADCASTING)
self._backfiller.set_root_hash(parent_state_root)
MAINNET_VM_CONFIGURATION = tuple(zip(MAINNET_FORK_BLOCKS, MAINNET_VMS))
class BaseMainnetChain:
chain_id = MAINNET_CHAIN_ID
vm_configuration = MAINNET_VM_CONFIGURATION # type: Tuple[Tuple[int, Type[BaseVM]], ...]
class MainnetChain(BaseMainnetChain, Chain):
pass
MAINNET_GENESIS_HEADER = BlockHeader(
difficulty=eth_constants.GENESIS_DIFFICULTY,
extra_data=decode_hex(
"0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
gas_limit=eth_constants.GENESIS_GAS_LIMIT,
gas_used=0,
bloom=0,
mix_hash=eth_constants.ZERO_HASH32,
nonce=eth_constants.GENESIS_NONCE,
block_number=0,
parent_hash=eth_constants.ZERO_HASH32,
receipt_root=eth_constants.BLANK_ROOT_HASH,
uncles_hash=eth_constants.EMPTY_UNCLE_HASH,
state_root=decode_hex(
"0xd7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544"),
timestamp=0,
transaction_root=eth_constants.BLANK_ROOT_HASH,
)
from eth.vm.message import (
Message, )
NORMALIZED_ADDRESS_A = "0x0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6"
NORMALIZED_ADDRESS_B = "0xcd1722f3947def4cf144679da39c4c32bdc35681"
ADDRESS_WITH_CODE = ("0xddd722f3947def4cf144679da39c4c32bdc35681",
b'pseudocode')
EMPTY_ADDRESS_IN_STATE = NORMALIZED_ADDRESS_A
ADDRESS_NOT_IN_STATE = NORMALIZED_ADDRESS_B
CANONICAL_ADDRESS_A = to_canonical_address(
"0x0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6")
CANONICAL_ADDRESS_B = to_canonical_address(
"0xcd1722f3947def4cf144679da39c4c32bdc35681")
GENESIS_HEADER = BlockHeader(
difficulty=constants.GENESIS_DIFFICULTY,
block_number=constants.GENESIS_BLOCK_NUMBER,
gas_limit=constants.GENESIS_GAS_LIMIT,
)
def prepare_computation(vm_class):
message = Message(
to=CANONICAL_ADDRESS_A,
sender=CANONICAL_ADDRESS_B,
value=100,
data=b'',
code=b'',
gas=800,
)
class ETC_VM(MainnetHomesteadVM):
support_dao_fork = False
# Ethereum mainnet headers, from two headers before to ten headers after the fork:
ETH_HEADERS_NEAR_FORK = [
BlockHeader(
difficulty=62352470509925,
block_number=1919998,
gas_limit=4712388,
timestamp=1469020835,
coinbase=b'\xbc\xdf\xc3[\x86\xbe\xdfr\xf0\xcd\xa0F\xa3\xc1h)\xa2\xefA\xd1',
parent_hash=b'\xe7\xe3\xe8+\xf3C\xbe\xf9\xa2R\xb8\x7f\x06r\x9adZop\x9b.RK\x9e\xf4\xf9;\xb9\xf2]S\x8d', # noqa: E501
uncles_hash=b'\x1d\xccM\xe8\xde\xc7]z\xab\x85\xb5g\xb6\xcc\xd4\x1a\xd3\x12E\x1b\x94\x8at\x13\xf0\xa1B\xfd@\xd4\x93G', # noqa: E501
state_root=b'\x1f!\x88?4\xde&\x93\xb4\xadGD\xc26a\xdbd\xca\xcb=\xa2\x1dr \xceW\xb97d\xb3\xbb\xfe', # noqa: E501
transaction_root=b'\xf2n\xb9\x94\x0e\xbb\xe8\x0c\xc3\xab\xbc\x9ev\xe9\xb7\xb1\x0f\xbcG\xc0\xd2\x12\xf9\x81\xa6q/\xf7\xf4\x97\xd3\xb4', # noqa: E501
receipt_root=b'D\xda\xa2\x9c4?\xa0/\xe8\x8fH\xf8?z\xc2\x1e\xfa\xc8j\xb0w8\r\xed\x81[(n\xd2jx\x1f', # noqa: E501
bloom=0,
gas_used=420000,
extra_data=b'\xd7\x83\x01\x04\n\x84Geth\x87go1.6.2\x85linux',
mix_hash=b'\x8d\x03\xe0$?1\xa6\xcd\x11\x04E\x1f\xfc\x10#[\x04\x16N\xbe[\xd4u-\xa6\xb54t\x8d\x87}\x9f', # noqa: E501
nonce=b'a\xd8\xc5\xdf\xfd\x0e\xb2v',
),
BlockHeader(
difficulty=62382916183238,
block_number=1919999,
gas_limit=4707788,
timestamp=1469020838,
coinbase=b'*e\xac\xa4\xd5\xfc[\\\x85\x90\x90\xa6\xc3M\x16A59\x82&',
parent_hash=b'P_\xfd!\xf4\xcb\xf2\xc5\xc3O\xa8L\xd8\xc9%%\xf3\xa7\x19\xb7\xad\x18\x85+\xff\xdd\xad`\x105\xf5\xf4', # noqa: E501