#!/usr/bin/env python3
from blockchain import BlockChain, public_key_to_address, ripemd160_to_address
from collections import defaultdict
import sys
BALANCES = defaultdict(int)
OUTPUTS = {}
filename = sys.argv[1]
with open(filename, "rb") as f:
data = f.read()
block_chain = BlockChain(data)
for block in block_chain.blocks():
for transaction in block["transactions"]:
for inp in transaction["inputs"]:
if inp["transaction_hash"] == b"0000000000000000000000000000000000000000000000000000000000000000":
pass # generated
else:
address, value = OUTPUTS[(inp["transaction_hash"], inp["transaction_index"])]
BALANCES[address] -= value
for output_num, output in enumerate(transaction["outputs"]):
transaction_hash = transaction["hash"]
index = output_num
value = output["value"]
script = output["script"]
if len(script) == 2 and script[1] == "OP_CHECKSIG":
address = public_key_to_address(script[0])
elif len(script) == 5 and (
countercurrent = 0
synchronized = 0
if receivedblockchain.length() == block_chain.length():
for i in range(receivedblockchain.length() - 1, -1, -1):
counterreceived += 1
for j in range(block_chain.length() - 1, -1, -1):
countercurrent += 1
#if match is found, take the longer blockchain as the current one
if receivedblockchain.blocks[
i].hash == block_chain.blocks[j].hash:
if counterreceived > countercurrent:
block_chain.replacechain(
receivedblockchain)
print("Replacing blockchain")
elif counterreceived == countercurrent:
block_chain.blocks = receivedblockchain.blocks
else:
updateothers = pickle.dumps(block_chain)
sock.sendall(b"update chain")
sock.sendall(updateothers)
synchronized = 1
break
elif receivedblockchain.length() > block_chain.length():
block_chain.blocks = receivedblockchain.blocks
synchronized = 1
else:
data_to_send = pickle.dumps(block_chain)
sock.sendall(b"update chain")
sock.sendall(data_to_send)
synchronized = 1
#if no match is found, print error message.
from blockchain import BlockChain
if __name__ == '__main__':
my_block_chain = BlockChain(debug=True)
my_block_chain.new_block('Second Block')
my_block_chain.new_block('Third Block')
for block in range(0, 10):
my_block_chain.new_block('Block %d' % block)
print(my_block_chain.blocks())
#!/usr/bin/env python3
from blockchain import BlockChain, public_key_to_address, ripemd160_to_address
from collections import defaultdict
import sys
BALANCES = defaultdict(int)
OUTPUTS = {}
filename = sys.argv[1]
with open(filename, "rb") as f:
data = f.read()
block_chain = BlockChain(data)
for block in block_chain.blocks():
for transaction in block["transactions"]:
for inp in transaction["inputs"]:
if inp["transaction_hash"] == b"0000000000000000000000000000000000000000000000000000000000000000":
pass # generated
else:
address, value = OUTPUTS[(inp["transaction_hash"],
inp["transaction_index"])]
BALANCES[address] -= value
for output_num, output in enumerate(transaction["outputs"]):
transaction_hash = transaction["hash"]
index = output_num
value = output["value"]
script = output["script"]
if len(script) == 2 and script[1] == "OP_CHECKSIG":
address = public_key_to_address(script[0])
