def test():
## Generate Key
sk = SigningKey.generate(curve=NIST192p)
vk = sk.get_verifying_key()
sk2 = SigningKey.generate(curve=NIST192p)
vk2 = sk2.get_verifying_key()
## Create Transactions
newTxn = Transaction(vk.to_string().hex(), 'receiverkey', 100)
## convert to JSON
toJson = newTxn.to_json()
## Sign JSON
signature = newTxn.sign(toJson, sk.to_string())
print(signature)
## Validate
validated = newTxn.validate_signature(toJson, signature, vk.to_string())
txn1 = Transaction(vk.to_string().hex(), 'receiverkey1', 100).to_json()
txn2 = Transaction(vk.to_string().hex(), 'client1', 100).to_json()
txn3 = Transaction(vk2.to_string().hex(), 'client3', 100).to_json()
transactionlist = [txn1, txn2, txn3]
## Create Block with transaction
block = Block(transactionlist)
block2 = Block([txn3])
chain = Blockchain()
chain.set_blockheader(block)
chain.add(block, 1)
chain.set_blockheader(block2)
chain.add(block2, 2)
#Populate blockchain with blocks
for i in range(2):
chain.set_blockheader(block)
chain.add(block, 1)
txn4 = Transaction('receiverkey1', 'receiverkey3', 100).to_json()
txn5 = Transaction('receiverkey3', 'receiverkey1', 100).to_json()
chain.transactionpool.append(txn4)
chain.transactionpool.append(txn5)
# Miner Test
m1 = Miner(chain)
m2 = Miner(chain)
block4 = m1.mine(chain)
chain.add(block4, m1.publickey.to_string().hex())
block5 = m1.mine(chain)
chain.add(block5, m1.publickey.to_string().hex())
# SPV Test
spvclient = SPVClient()
checktransaction = spvclient.receive_transaction(txn3, m1)
newtxn = spvclient.new_txn(m1.publickey.to_string().hex(), 100)
nt = m1.new_txn(spvclient.publickey.to_string().hex(), 100)
print(nt)
miners_list = [m1, m2]
#####selfish mining attack####
m3 = SelfishMiner(chain)
miners_list.append(m3)
for miner in miners_list:
block = miner.mine(chain)
chain.add(block, miner.publickey.to_string().hex())
#trying to show the number of blocks mined by selfish miners
selfish_blocks = m3.selfish_mine(chain)
print("Selfish miner's work: ", selfish_blocks)
###DOUBLE SPENDING attack###
m4 = DoubleSpender(chain)
#first let m4 have some money
#m2 make txn to send 60 to m4
txnToDS = m2.new_txn(m4.publickey.to_string().hex(), 60)
#attacker mine the latest txn pool
dsBlock = m4.mine(chain)
chain.add(dsBlock, m4.publickey.to_string().hex())
print("Attacker's balance (before) is",
m4.get_balance(chain,
m4.publickey.to_string().hex()))
#he then performs the attack
dsBlocks = m4.attack(chain)
print("Attacker's balance (after) is",
m4.get_balance(chain,
m4.publickey.to_string().hex()))
