def test_tx_validation_fails(self, m_TransferTransaction_validate,
m_TransferTransaction_validate_extended,
m_TransferTransaction_apply_state_changes,
m_CoinBase_apply_state_changes):
get_optimized_address_state = MockFunction()
get_optimized_address_state.put(self.coinbase_addrstate_attrs.address,
self.coinbase_addrstate_attrs)
get_optimized_address_state.put(self.bob_addrstate_attrs.address,
self.bob_addrstate_attrs)
get_optimized_address_state.put(self.alice_addrstate_attrs.address,
self.alice_addrstate_attrs)
get_optimized_address_state.put(self.slave_addrstate_attrs.address,
self.slave_addrstate_attrs)
block = Block.create(**self.block_attrs)
m_TransferTransaction_validate.return_value = False
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
m_TransferTransaction_validate.return_value = True
m_TransferTransaction_validate_extended.return_value = False
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
m_TransferTransaction_validate_extended.return_value = True
with patch('xrd.core.txs.CoinBase.CoinBase._validate_extended'
) as m_validate_extended:
m_validate_extended.return_value = False
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
def test_getBlock(self):
with set_xrd_dir('no_data'):
db_state = State()
p2p_factory = Mock(spec=P2PFactory)
p2p_factory.pow = Mock(spec=POW)
chain_manager = ChainManager(db_state)
xrdnode = xrdNode(mining_address=b'')
xrdnode.set_chain_manager(chain_manager)
xrdnode._p2pfactory = p2p_factory
xrdnode._pow = p2p_factory.pow
xrdnode._peer_addresses = ['127.0.0.1', '192.168.1.1']
service = PublicAPIService(xrdnode)
alice_xmss = get_alice_xmss()
b = Block.create(dev_config=config.dev,
block_number=1,
prev_headerhash=sha256(b'reveal'),
prev_timestamp=10,
transactions=[],
miner_address=alice_xmss.address,
seed_height=0,
seed_hash=None)
Block.put_block(db_state, b, None)
db_state.get_block = MagicMock(return_value=b)
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetBlockReq(header_hash=b.headerhash)
response = service.GetBlock(request=request, context=context)
context.set_code.assert_not_called()
self.assertEqual(1, response.block.header.block_number)
def test_bad_nonce_or_ots_reused(self, m_TransferTransaction_validate,
m_TransferTransaction_validate_extended,
m_TransferTransaction_apply_state_changes,
m_CoinBase_apply_state_changes):
# If a TX was signed by a Slave XMSS, apply_state_changes() should check against the Slave's AddressState.nonce.
# In this case, tx.nonce = 3 but slave addrstate.nonce = 0
self.slave_addrstate_attrs.pbdata.nonce = 0
get_optimized_address_state = MockFunction()
get_optimized_address_state.put(self.coinbase_addrstate_attrs.address,
self.coinbase_addrstate_attrs)
get_optimized_address_state.put(self.bob_addrstate_attrs.address,
self.bob_addrstate_attrs)
get_optimized_address_state.put(self.alice_addrstate_attrs.address,
self.alice_addrstate_attrs)
get_optimized_address_state.put(self.slave_addrstate_attrs.address,
self.slave_addrstate_attrs)
block = Block.create(**self.block_attrs)
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
self.slave_addrstate_attrs.pbdata.nonce = 5
# Now we pretend that Alice's OTS key has been reused.
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
# Now we pretend that Slave's OTS key has been reused.
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
def test_rollback_tx_metadata(self):
alice_xmss = get_alice_xmss()
tx1 = TransferTransaction.create(
addrs_to=[get_some_address(1),
get_some_address(2)],
amounts=[1, 2],
message_data=None,
fee=0,
xmss_pk=alice_xmss.pk)
block = Block.create(dev_config=config.dev,
block_number=5,
prev_headerhash=b'',
prev_timestamp=10,
transactions=[tx1],
miner_address=b'',
seed_height=0,
seed_hash=None)
TransactionMetadata.update_tx_metadata(self.state,
block=block,
batch=None)
tx_metadata = TransactionMetadata.get_tx_metadata(
self.state, tx1.txhash)
self.assertEqual(tx_metadata[0].to_json(), tx1.to_json())
TransactionMetadata.rollback_tx_metadata(self.state, block, None)
self.assertIsNone(
TransactionMetadata.get_tx_metadata(self.state, tx1.txhash))
def setUp(self):
self.block = Block.create(dev_config=config.dev,
block_number=5,
prev_headerhash=bytes(sha2_256(b'test')),
prev_timestamp=10,
transactions=[],
miner_address=alice.address,
seed_height=0,
seed_hash=None)
def test_write_batch(self):
batch = self.state.batch
block = Block.create(dev_config=config.dev,
block_number=10,
prev_headerhash=b'aa',
prev_timestamp=10,
transactions=[],
miner_address=b'aa',
seed_height=0,
seed_hash=None)
Block.put_block(self.state, block, batch)
self.assertIsNone(Block.get_block(self.state, block.headerhash))
self.state.write_batch(batch)
block2 = Block.get_block(self.state, block.headerhash)
self.assertEqual(block.headerhash, block2.headerhash)
def setUp(self):
self.blockheader = Mock(name='mock BlockHeader',
autospec=BlockHeader,
block_number=5,
headerhash=bytes(sha2_256(b'mock headerhash')),
prev_headerhash=bytes(sha2_256(b'test')))
self.block = Block.create(dev_config=config.dev,
block_number=5,
prev_headerhash=bytes(sha2_256(b'test')),
prev_timestamp=10,
transactions=[],
miner_address=alice.address,
seed_height=0,
seed_hash=None)
self.block.blockheader = self.blockheader
def test_all_ok(self, m_TransferTransaction_validate,
m_TransferTransaction_validate_extended,
m_TransferTransaction_apply_state_changes,
m_CoinBase_apply_state_changes):
get_optimized_address_state = MockFunction()
get_optimized_address_state.put(self.coinbase_addrstate_attrs.address,
self.coinbase_addrstate_attrs)
get_optimized_address_state.put(self.bob_addrstate_attrs.address,
self.bob_addrstate_attrs)
get_optimized_address_state.put(self.alice_addrstate_attrs.address,
self.alice_addrstate_attrs)
get_optimized_address_state.put(self.slave_addrstate_attrs.address,
self.slave_addrstate_attrs)
self.chain_manager.get_optimized_address_state = get_optimized_address_state.get
block = Block.create(**self.block_attrs)
result = self.chain_manager._apply_state_changes(block, None)
self.assertTrue(result)
def test_extra_coinbase_tx(self, m_TransferTransaction_validate,
m_TransferTransaction_validate_extended,
m_TransferTransaction_apply_state_changes,
m_CoinBase_apply_state_changes):
get_optimized_address_state = MockFunction()
get_optimized_address_state.put(self.coinbase_addrstate_attrs.address,
self.coinbase_addrstate_attrs)
get_optimized_address_state.put(self.bob_addrstate_attrs.address,
self.bob_addrstate_attrs)
get_optimized_address_state.put(self.alice_addrstate_attrs.address,
self.alice_addrstate_attrs)
get_optimized_address_state.put(self.slave_addrstate_attrs.address,
self.slave_addrstate_attrs)
coinbase_extra = CoinBase.create(config.dev, 500, self.alice.address,
5)
self.block_attrs["transactions"] = [self.tx1, coinbase_extra, self.tx2]
block = Block.create(**self.block_attrs)
result = self.chain_manager._apply_state_changes(block, None)
self.assertFalse(result)
def create_block(self, prev_hash, mining_address=None):
if not mining_address:
mining_address = self.alice_xmss.address
transactions = []
block_prev = self.xrdnode.get_block_from_hash(prev_hash)
block_idx = block_prev.block_number + 1
if block_idx == 1:
slave_tx = SlaveTransaction.create(slave_pks=[self.bob_xmss.pk],
access_types=[0],
fee=0,
xmss_pk=self.alice_xmss.pk)
slave_tx.sign(self.alice_xmss)
slave_tx._data.nonce = 1
transactions = [slave_tx]
time_offset = 60
if block_idx % 2 == 0:
time_offset += 2
self.time_mock.return_value = self.time_mock.return_value + time_offset
self.ntp_mock.return_value = self.ntp_mock.return_value + time_offset
block_new = Block.create(dev_config=config.dev,
block_number=block_idx,
prev_headerhash=block_prev.headerhash,
prev_timestamp=block_prev.timestamp,
transactions=transactions,
miner_address=mining_address,
seed_height=0,
seed_hash=None)
dev_config = self.xrdnode._chain_manager.get_config_by_block_number(
block_new.block_number)
while not self.xrdnode._chain_manager.validate_mining_nonce(
blockheader=block_new.blockheader, dev_config=dev_config):
block_new.set_nonces(config.dev, block_new.mining_nonce + 1, 0)
return block_new
def main():
if len(sys.argv) > 2:
print("Unexpected arguments")
sys.exit(0)
elif len(sys.argv) == 1:
print("Missing Filename")
sys.exit(0)
filename = sys.argv[1]
if sys.version_info.major > 2:
seed = bytes(hstr2bin(input('Enter extended hexseed: ')))
else:
seed = bytes(hstr2bin(raw_input('Enter extended hexseed: '))) # noqa
dist_xmss = XMSS.from_extended_seed(seed)
transactions = get_migration_transactions(signing_xmss=dist_xmss,
filename=filename)
block = Block.create(dev_config=config.dev,
block_number=0,
prev_headerhash=config.user.genesis_prev_headerhash,
prev_timestamp=config.user.genesis_timestamp,
transactions=transactions,
miner_address=dist_xmss.address,
seed_height=None,
seed_hash=None)
block.set_nonces(config.dev, 0, 0)
block._data.genesis_balance.extend([
xrd_pb2.GenesisBalance(address=config.dev.coinbase_address,
balance=105000000000000000)
])
with open('genesis.yml', 'w') as f:
yaml.dump(json.loads(block.to_json()), f)
def gen_blocks(block_count, state, miner_address):
blocks = []
block = None
with mock.patch('xrd.core.misc.ntp.getTime') as time_mock:
time_mock.return_value = 1615270948
addresses_state = dict()
for i in range(0, block_count):
if i == 0:
block = GenesisBlock()
for genesis_balance in GenesisBlock().genesis_balance:
bytes_addr = genesis_balance.address
addresses_state[
bytes_addr] = OptimizedAddressState.get_default(
bytes_addr)
addresses_state[
bytes_addr]._data.balance = genesis_balance.balance
else:
block = Block.create(dev_config=config.dev,
block_number=i,
prev_headerhash=block.headerhash,
prev_timestamp=block.timestamp,
transactions=[],
miner_address=miner_address,
seed_height=None,
seed_hash=None)
addresses_set = ChainManager.set_affected_address(block)
coin_base_tx = Transaction.from_pbdata(block.transactions[0])
coin_base_tx.set_affected_address(addresses_set)
chain_manager = ChainManager(state)
state_container = chain_manager.new_state_container(
addresses_set, block.block_number, False, None)
coin_base_tx.apply(state, state_container)
for tx_idx in range(1, len(block.transactions)):
tx = Transaction.from_pbdata(block.transactions[tx_idx])
if not chain_manager.update_state_container(
tx, state_container):
return False
tx.apply(state, state_container)
block.set_nonces(dev_config=config.dev,
mining_nonce=10,
extra_nonce=0)
blocks.append(block)
metadata = BlockMetadata()
metadata.set_block_difficulty(StringToUInt256('256'))
BlockMetadata.put_block_metadata(state, block.headerhash, metadata,
None)
Block.put_block(state, block, None)
bm = xrd_pb2.BlockNumberMapping(
headerhash=block.headerhash,
prev_headerhash=block.prev_headerhash)
Block.put_block_number_mapping(state, block.block_number, bm, None)
state.update_mainchain_height(block.block_number, None)
OptimizedAddressState.put_optimized_addresses_state(
state, addresses_state)
return blocks
def test_getMiniTransactionsByAddress(self, mock_dev_config):
mock_dev_config.data_per_page = 5
with set_xrd_dir('no_data'):
db_state = State()
p2p_factory = Mock(spec=P2PFactory)
p2p_factory.pow = Mock(spec=POW)
chain_manager = ChainManager(db_state)
xrdnode = xrdNode(mining_address=b'')
xrdnode.set_chain_manager(chain_manager)
xrdnode._p2pfactory = p2p_factory
xrdnode._pow = p2p_factory.pow
xrdnode._peer_addresses = ['127.0.0.1', '192.168.1.1']
service = PublicAPIService(xrdnode)
# Find a transaction
alice_xmss = get_alice_xmss(8)
context = Mock(spec=ServicerContext)
bob_xmss = get_bob_xmss(4)
txs = []
for i in range(0, 100):
tx = TransferTransaction.create(addrs_to=[bob_xmss.address],
amounts=[10],
message_data=None,
fee=0,
xmss_pk=alice_xmss.pk)
tx.sign(alice_xmss)
txs.append(tx)
addresses_set = {bob_xmss.address, alice_xmss.address}
block = Block.create(config.dev, 10, b'', 100000000, txs,
alice_xmss.address, seed_height=0, seed_hash=None)
state_container = chain_manager.new_state_container(addresses_set,
5,
True,
None)
for tx in txs:
chain_manager.update_state_container(tx, state_container)
address_state = state_container.addresses_state[tx.addr_from]
state_container.paginated_tx_hash.insert(address_state, tx.txhash)
address_state = state_container.addresses_state[tx.addrs_to[0]]
state_container.paginated_tx_hash.insert(address_state, tx.txhash)
state_container.paginated_tx_hash.put_paginated_data(None)
OptimizedAddressState.put_optimized_addresses_state(db_state, state_container.addresses_state)
TransactionMetadata.update_tx_metadata(db_state, block, None)
request = xrd_pb2.GetMiniTransactionsByAddressReq(address=alice_xmss.address,
item_per_page=10,
page_number=1)
response = service.GetMiniTransactionsByAddress(request=request, context=context)
context.set_code.assert_not_called()
self.assertEqual(len(response.mini_transactions), 10)
for i in range(0, 10):
self.assertEqual(bin2hstr(txs[len(txs) - i - 1].txhash),
response.mini_transactions[i].transaction_hash)
self.assertEqual(response.balance, 0)
TransactionMetadata.update_tx_metadata(db_state, block, None)
request = xrd_pb2.GetMiniTransactionsByAddressReq(address=alice_xmss.address,
item_per_page=8,
page_number=3)
response = service.GetMiniTransactionsByAddress(request=request, context=context)
context.set_code.assert_not_called()
self.assertEqual(len(response.mini_transactions), 8)
for i in range(0, 8):
self.assertEqual(bin2hstr(txs[len(txs) - i - 17].txhash),
response.mini_transactions[i].transaction_hash)
self.assertEqual(response.balance, 0)
def test_getLatestData(self):
with set_xrd_dir('no_data'):
db_state = State()
chain_manager = ChainManager(db_state)
blocks = []
txs = []
alice_xmss = get_alice_xmss()
bob_xmss = get_bob_xmss()
for i in range(0, 4):
for j in range(1, 3):
txs.append(TransferTransaction.create(addrs_to=[bob_xmss.address],
amounts=[i * 100 + j],
message_data=None,
fee=j,
xmss_pk=alice_xmss.pk))
blocks.append(Block.create(dev_config=config.dev,
block_number=i,
prev_headerhash=sha256(b'reveal'),
prev_timestamp=10,
transactions=txs,
miner_address=alice_xmss.address,
seed_height=10,
seed_hash=None))
block = blocks[i]
Block.put_block(db_state,
block,
None)
Block.put_block_number_mapping(db_state,
block.block_number,
xrd_pb2.BlockNumberMapping(headerhash=block.headerhash),
None)
TransactionMetadata.update_tx_metadata(db_state, block, None)
chain_manager._last_block = blocks[-1]
txpool = []
txs = []
for j in range(10, 15):
tx = TransferTransaction.create(addrs_to=[bob_xmss.address],
amounts=[1000 + j],
message_data=None,
fee=j,
xmss_pk=get_alice_xmss().pk)
txpool.append((tx.fee, TransactionInfo(tx, 0)))
txs.append(tx)
p2p_factory = Mock(spec=P2PFactory)
p2p_factory.pow = Mock(spec=POW)
chain_manager.tx_pool = Mock()
chain_manager.tx_pool.transactions = heapq.nlargest(len(txpool), txpool)
chain_manager.tx_pool.transaction_pool = txpool
xrdnode = xrdNode(mining_address=b'')
xrdnode.set_chain_manager(chain_manager)
xrdnode.get_block_from_index = MagicMock(return_value=None)
xrdnode._p2pfactory = p2p_factory
xrdnode._pow = p2p_factory.pow
service = PublicAPIService(xrdnode)
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetLatestDataReq(filter=xrd_pb2.GetLatestDataReq.ALL,
offset=0,
quantity=3)
response = service.GetLatestData(request=request, context=context)
context.set_code.assert_not_called()
context.set_details.assert_not_called()
# Verify blockheaders
self.assertEqual(3, len(response.blockheaders))
self.assertEqual(1, response.blockheaders[0].header.block_number)
self.assertEqual(2, response.blockheaders[1].header.block_number)
self.assertEqual(3, response.blockheaders[2].header.block_number)
# Verify transactions_unconfirmed
self.assertEqual(3, len(response.transactions_unconfirmed))
# TODO: Verify expected order
self.assertEqual(1014, response.transactions_unconfirmed[0].tx.transfer.amounts[0])
self.assertEqual(1013, response.transactions_unconfirmed[1].tx.transfer.amounts[0])
self.assertEqual(1012, response.transactions_unconfirmed[2].tx.transfer.amounts[0])
# Verify transactions
self.assertEqual(3, len(response.transactions))
self.assertEqual(2, response.transactions[0].tx.fee)
self.assertEqual(1, response.transactions[1].tx.fee)
self.assertEqual(2, response.transactions[2].tx.fee)
self.assertEqual(302, response.transactions[0].tx.transfer.amounts[0])
self.assertEqual(301, response.transactions[1].tx.transfer.amounts[0])
self.assertEqual(202, response.transactions[2].tx.transfer.amounts[0])
def test_getObject(self):
SOME_ODD_HASH = sha256(b'this should not be found')
with set_xrd_dir('no_data'):
db_state = State()
p2p_factory = Mock(spec=P2PFactory)
p2p_factory.pow = Mock(spec=POW)
chain_manager = ChainManager(db_state)
xrdnode = xrdNode(mining_address=b'')
xrdnode.set_chain_manager(chain_manager)
xrdnode._p2pfactory = p2p_factory
xrdnode._pow = p2p_factory.pow
xrdnode._peer_addresses = ['127.0.0.1', '192.168.1.1']
service = PublicAPIService(xrdnode)
# First try an empty request
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetObjectReq()
response = service.GetObject(request=request, context=context)
context.set_code.assert_not_called()
context.set_details.assert_not_called()
self.assertFalse(response.found)
# Some odd address
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetObjectReq()
request.query = SOME_ODD_HASH
response = service.GetObject(request=request, context=context)
context.set_code.assert_not_called()
self.assertFalse(response.found)
# Find an address
bob_xmss = get_bob_xmss()
addr1_state = OptimizedAddressState.create(address=bob_xmss.address,
nonce=25,
balance=10,
ots_bitfield_used_page=0,
transaction_hash_count=0,
tokens_count=0,
lattice_pk_count=0,
slaves_count=0,
multi_sig_address_count=0)
AddressState.put_address_state(db_state, addr1_state, None)
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetObjectReq()
request.query = bob_xmss.address
response = service.GetObject(request=request, context=context)
context.set_code.assert_not_called()
self.assertTrue(response.found)
self.assertIsNotNone(response.address_state)
self.assertEqual(bob_xmss.address, response.address_state.address)
self.assertEqual(25, response.address_state.nonce)
self.assertEqual(10, response.address_state.balance)
# Find a transaction
alice_xmss = get_alice_xmss()
db_state.address_used = MagicMock(return_value=False)
tx1 = TransferTransaction.create(
addrs_to=[bob_xmss.address],
amounts=[125],
message_data=None,
fee=19,
xmss_pk=bob_xmss.pk,
master_addr=alice_xmss.address)
chain_manager.tx_pool.transaction_pool = [(0, TransactionInfo(tx1, 0))]
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetObjectReq()
request.query = tx1.txhash
response = service.GetObject(request=request, context=context)
context.set_code.assert_not_called()
self.assertTrue(response.found)
self.assertIsNotNone(response.transaction)
self.assertEqual('transfer', response.transaction.tx.WhichOneof('transactionType'))
self.assertEqual(alice_xmss.address, response.transaction.tx.master_addr)
self.assertEqual(bob_xmss.pk, response.transaction.tx.public_key)
self.assertEqual(tx1.txhash, response.transaction.tx.transaction_hash)
self.assertEqual(b'', response.transaction.tx.signature)
self.assertEqual(bob_xmss.address, response.transaction.tx.transfer.addrs_to[0])
self.assertEqual(125, response.transaction.tx.transfer.amounts[0])
self.assertEqual(19, response.transaction.tx.fee)
alice_xmss = get_alice_xmss()
# Find a block
block = Block.create(dev_config=config.dev,
block_number=1,
prev_headerhash=sha256(b'reveal'),
prev_timestamp=10,
transactions=[],
miner_address=alice_xmss.address,
seed_height=0,
seed_hash=None)
Block.put_block(db_state, block, None)
Block.put_block_number_mapping(db_state,
block.block_number,
xrd_pb2.BlockNumberMapping(headerhash=block.headerhash),
None)
context = Mock(spec=ServicerContext)
request = xrd_pb2.GetObjectReq()
request.query = bytes(str2bin('1'))
response = service.GetObject(request=request, context=context)
context.set_code.assert_not_called()
self.assertTrue(response.found)
self.assertIsNotNone(response.block_extended)
self.assertEqual(1, response.block_extended.header.block_number)
def create_block(self, last_block, mining_nonce, tx_pool: TransactionPool,
miner_address) -> Optional[Block]:
seed_block = self._chain_manager.get_block_by_number(
self._qn.get_seed_height(last_block.block_number + 1))
dev_config = self._chain_manager.get_config_by_block_number(
block_number=last_block.block_number + 1)
dummy_block = Block.create(dev_config=dev_config,
block_number=last_block.block_number + 1,
prev_headerhash=last_block.headerhash,
prev_timestamp=last_block.timestamp,
transactions=[],
miner_address=miner_address,
seed_height=seed_block.block_number,
seed_hash=seed_block.headerhash)
dummy_block.set_nonces(dev_config, mining_nonce, 0)
t_pool2 = tx_pool.transactions
block_size = dummy_block.size
block_size_limit = self._chain_manager.get_block_size_limit(
last_block, dev_config)
transactions = []
state_container = self._chain_manager.new_state_container(
set(), last_block.block_number, True, None)
for tx_set in t_pool2:
tx = tx_set[1].transaction
# Skip Transactions for later, which doesn't fit into block
if block_size + tx.size + dev_config.tx_extra_overhead > block_size_limit:
continue
if not self._chain_manager.update_state_container(
tx, state_container):
logger.error("[create_block] Error updating state_container")
return None
if not tx.validate_all(state_container, check_nonce=False):
if not state_container.revert_update():
return None
tx_pool.remove_tx_from_pool(tx)
continue
if not self._chain_manager.apply_txn(tx, state_container):
logger.error("[create_block] Failed to apply txn")
if not state_container.revert_update():
return None
continue
addr_from_pk_state = state_container.addresses_state[tx.addr_from]
addr_from_pk = Transaction.get_slave(tx)
if addr_from_pk:
addr_from_pk_state = state_container.addresses_state[
addr_from_pk]
tx._data.nonce = addr_from_pk_state.nonce
block_size += tx.size + dev_config.tx_extra_overhead
transactions.append(tx)
block = Block.create(dev_config=dev_config,
block_number=last_block.block_number + 1,
prev_headerhash=last_block.headerhash,
prev_timestamp=last_block.timestamp,
transactions=transactions,
miner_address=miner_address,
seed_height=seed_block.block_number,
seed_hash=seed_block.headerhash)
return block