def transaction(receiver, amount, times=1):
global public
global private
global blockchain
if get_balance(public) < amount:
print "You don't have enough HackCoins."
return
txns = []
if os.path.exists(TXN_FILE):
with open(TXN_FILE, 'r') as f:
txns_json = f.read()
txns = jsonpickle.decode(txns_json)
for _ in range(times):
# Build a new transaction.
t = Transaction(id=gen_uuid(),
owner=public,
receiver=receiver,
coins=amount,
signature=None)
# Sign it.
t.signature = sign(t.comp(), private)
# Place it in the miner queue to be mined.
txns.append(t)
with open(TXN_FILE, 'w') as f:
f.write(jsonpickle.encode(txns))
def paySomeone(public, private, target, amount):
txn = Transaction(id=gen_uuid(),
owner=public,
receiver=target,
coins=amount,
signature=None)
txn.signature = sign(txn.comp(), private)
return txn
def run_miner():
"""Run the main miner loop.
"""
global blockchain
global public
global private
while True:
# Load transaction queue and blockchain from server.
txns = load_transactions()
blockchain = load_blockchain()
# Add reward to us yay.
reward = Transaction(id=gen_uuid(),
owner="mined",
receiver=public,
coins=REWARD,
signature=None)
reward.signature = sign(reward.comp(), private)
txns.append(reward)
# Construct a new block.
b = Block(timestamp=datetime.datetime.now(),
transactions=txns,
previous_hash=blockchain.head.hash_block())
# Let's mine this block.
mine_till_found(b)
# Is this _the_ new block?
# or did the server swoop us :(
new_chain = load_blockchain()
if new_chain.head.hash_block() == blockchain.head.hash_block():
# WE MINED THIS BLOCK YAY.
# AND WE WIN.
resp = get_route('add', data=str(b))
if resp['success']:
print "Block added!"
delete_queue(txns)
else:
print "Couldn't add block:", resp['message']
else:
print "Someone else mined the block before us :("
def run_miner():
"""Run the main miner loop.
"""
my_address = "2cb4fc5902917e58e531cfbe1d909727aaf331b4856bf8627e09bf8941b69a40"
my_private = "610af1630bf08b0072d97bdaf71882cd0a2c86e7af72296b4ee73f508b812c28"
my_address_2 = "a173fd8d2330cc2b4776730891f50099204376217c67b7b23254aca04fbeb5a3"
my_private_2 = "d0f783f01ac0df1799856964fe74f702763932e1edf3e9d0074646de885d5559"
public = my_address_2
private = my_private_2
donor = None
while True:
print("new public", public)
print("new private", private)
global blockchain
global real_b1
global fake_b1
global fake_b2
blockchain = load_blockchain()
# Add reward to us yay.
# my_address_3 = "5adbd7137903135fa2cc5a2de2035a326319e42188a9c6714b26fa016c6ac1bb"
# my_private_3 = "91f233e1218135b772ddc87a199e6d3cc18233753623f95385dde62e886304c7"
amount_1 = blockchain.get_wallet_amount(my_address)
amount_2 = blockchain.get_wallet_amount(my_address_2)
# amount_3 = blockchain.get_wallet_amount(my_address_3)
if amount_1 < 0:
my_private, my_address = generate_keys()
public = my_address
private = my_private
donor_pub = my_address_2
donor_private = my_private_2
donor_amount = amount_2
else:
my_private_2, my_address_2 = generate_keys()
public = my_address_2
private = my_private_2
donor_pub = my_address
donor_private = my_private
donor_amount = amount_1
# Add reward to us yay.
reward = Transaction(
id = gen_uuid(),
owner = "mined",
receiver = public,
coins = REWARD,
signature = None
)
txns = []
reward.signature = sign(reward.comp(), private)
txns.append(reward)
donation1 = Transaction(
id = gen_uuid(),
owner = donor_pub,
receiver = "3119281c76dc54009925c9208bedc5bd0162c27034a1649fd7e2e5df62dba557",
coins = donor_amount,
signature = None
)
donation1.signature = sign(donation1.comp(), donor_private)
donation2 = Transaction(
id = gen_uuid(),
owner = donor_pub,
receiver = public,
coins = donor_amount,
signature = None
)
donation2.signature = sign(donation2.comp(), donor_private)
txns.append(donation1)
txns.append(donation2)
# Construct a new block.
real_b1 = Block(
timestamp = datetime.datetime.now(),
transactions = txns,
previous_hash = blockchain.head.hash_block()
)
mine_till_found(real_b1)
new_chain = load_blockchain()
# print "Adding real block now"
# resp1 = get_route('add', data=str(real_b1))
# if resp1['success']:
# print "Added real block1!"
# else:
# print "Couldn't add block:", resp1['message']
if new_chain.head.hash_block() == blockchain.head.hash_block():
print "Adding real block now"
resp1 = get_route('add', data=str(real_b1))
if resp1['success']:
print "Added real block1!"
else:
print "Couldn't add block:", resp1['message']
else:
print "Someone else mined the block before us :("
def run_miner():
"""Run the main miner loop.
"""
global blockchain
global public
global private
while True:
# Load transaction queue and blockchain from server.
txns = load_transactions()
blockchain = load_blockchain()
# Loc: Check our balance
balance = get_balance(public)
print "Current balance", balance
# Loc: Set up attack
is_attacking = False
if balance > 60:
print "Setting up Finney attack"
is_attacking = True
t = Transaction(
id=gen_uuid(),
owner=public,
receiver=
"6f181e44edfc93de084071e590421e5b083f93da6012d441658b6b31a966ae9c",
coins=balance,
signature=None)
# Sign it.
t.signature = sign(t.comp(), private)
# Pay myself a lot!
for x in range(0, 3):
txns.append(t)
# Add reward to us yay.
reward = Transaction(id=gen_uuid(),
owner="mined",
receiver=public,
coins=REWARD,
signature=None)
reward.signature = sign(reward.comp(), private)
txns.append(reward)
# Construct a new block.
b = Block(timestamp=datetime.datetime.now(),
transactions=txns,
previous_hash=blockchain.head.hash_block())
# Let's mine this block.
mine_till_found(b)
# Is this _the_ new block?
# or did the server swoop us :(
new_chain = load_blockchain()
if new_chain.head.hash_block() == blockchain.head.hash_block():
# WE MINED THIS BLOCK YAY.
# AND WE WIN.
# Loc: Add in a Finney attack to double spend the coin
resp = get_route('add', data=str(b))
if resp['success']:
print "Block added!"
delete_queue(txns)
else:
print "Couldn't add block:", resp['message']
else:
print "Someone else mined the block before us :("
def run_miner():
"""Run the main miner loop.
"""
global blockchain
global public
global private
new_reward = REWARD
while True:
# Load transaction queue and blockchain from server.
new = []
blockchain = Blockchain()
blockchain.add_block(
Block(
timestamp=datetime.datetime.now(),
transactions=[],
previous_hash=get_genisis().hash_block(),
nonce=12834
),
cheat=True
)
server = load_blockchain()
txns = load_transactions()
# Is this _the_ new block?
# or did the server swoop us :(
new_chain = load_blockchain()
num_blocks = 1333 + server.head.height
for i in range (num_blocks):
reward = Transaction(
id = gen_uuid(),
owner = "mined",
receiver = public,
coins = REWARD,
signature = None
)
reward.signature = sign(reward.comp(), private)
txns = [reward]
b = Block(
timestamp = datetime.datetime.now(),
transactions = txns,
previous_hash = blockchain.head.hash_block()
)
blockchain.add_block(b, cheat=True)
# Let's mine this block.
reward = Transaction(
id = gen_uuid(),
owner = "mined",
receiver = public,
coins = REWARD,
signature = None
)
reward.signature = sign(reward.comp(), private)
txns = [reward]
# Construct a new block.
b = Block(
timestamp = datetime.datetime.now(),
transactions = txns,
previous_hash = b.hash_block()
)
print(blockchain.head.height)
mine_till_found(b)
# WE MINED THIS BLOCK YAY.
# AND WE WIN.
resp = get_route('add', data=str(b))
if resp['success']:
print "Block added!"
delete_queue(txns)
else:
print "Couldn't add block:", resp['message']