def generate_transaction(receiver, amount, commission):
publicKey = Key._publicKey
privateKey = Key._privateKey
publicKey_ser = publicKey.serialize(compressed=False)
total = 0
in_counter = 0
out_counter = 0
vin = []
vout = []
tmpUTXO = [] # Temporary UTXOset for resulting transaction
# Check if amount or commission is negative
if amount <= 0 or commission < 0:
print('Invalid input value')
return False
# Check if balance is sufficient
for key, value in UTXOset._myUTXOset.iterator():
d_value = json.loads(value)
address_ser = base64.b64decode(d_value["address"])
if address_ser != publicKey_ser:
UTXOset.Pop_myUTXO(key, d_value["index"])
continue
tmpUTXO.append(
UTXO(key, d_value["index"], d_value["address"], d_value["amount"]))
total += d_value["amount"]
if total > amount + commission:
break
# Insufficient balance
if total < amount + commission:
print('Insufficient BTC balance')
return False
# Generate inputs
for output in tmpUTXO:
total += output.amount
in_counter += 1
# Generate signatures
unlockSig = privateKey.generate_sign(output.txOutid)
unlock = privateKey.ecdsa_serialize(unlockSig)
vin.append(Vin(output.txOutid, output.index, unlock))
# Generate outputs
vout.append(Vout(amount, receiver))
change = total - commission - amount
if change > 0:
vout.append(Vout(change, publicKey_ser))
# Generate tx_id
SumString = str(in_counter)
for input in vin:
SumString = SumString + str(input.tx_id) + str(input.index) + str(
input.unlock)
SumString = SumString + str(out_counter)
for output in vout:
SumString = SumString + str(output.value) + str(output.lock)
keccak_hash = keccak.new(digest_bits=256)
keccak_hash.update(SumString.encode(
'ascii')) # keccak_hash == tx_id of current transaction
# Add to UTXOset and myUTXOset
address = base64.b64encode(receiver).decode('utf-8')
UTXOset.Insert_UTXO(keccak_hash.hexdigest().encode(), 0, address,
float(amount))
if (change > 0):
address = base64.b64encode(publicKey_ser).decode('utf-8')
UTXOset.Insert_UTXO(keccak_hash.hexdigest().encode(), 1, address,
float(amount))
UTXOset.Insert_myUTXO(keccak_hash.hexdigest().encode(), 1, address,
float(amount))
# Delete from UTXOset and myUTXOset
for otuput in tmpUTXO:
UTXOset.Pop_UTXO(output.txOutid, output.index)
UTXOset.Pop_myUTXO(output.txOutid, output.index)
# Add to memoryPool
Transaction.Insert_MemoryPool(keccak_hash.hexdigest().encode(), in_counter,
vin, out_counter, vout)
return True
