offline_burn_tokens.py

#!/usr/bin/env python3
# Copyright (c) DeFi Blockchain Developers

'''
Following script requires these Python packages to be installed with pip3
or your package management software.

base58, ecdsa, hashlib and python_bitcoinlib
'''

# defi directory must be included
from defi.addressutils import *
from defi.interface import *
from defi.transactions import make_signed_transaction

# Help info
if len(sys.argv) < 5 or len(sys.argv) > 6:
    print_and_exit('\nUsage: offline_burn_tokens.py tokenID amount "private key" "input" "burn address"\n\n'
         'tokenID (number): token identifier\n\n'
         'amount (number): number of tokens to burn\n\n'
         'private key (string): private key to sign transaction. input MUST be from this key and\n'
         'be the owner of tokens to burn.\n\n'
         'input (string): UTXO for the token owner address, amount to spend in UTXO, change sent\n'
         'to private key address, 0.0001 fee.\n'
         'input example: \'[{"txid":"TXID","vout":0,"amount":"0.00000000","type":"P2SH-P2WPKH"}]\'\n'
         'burn address: (options) Set designed burn address 8F to 8d, defaults to "8addressToBurn"\n')

# Get args from user
tokenID = user_token_id()
amount = user_amount()
privateKey = user_private_key()
txid, vout, inputAmount, has_segwit = user_utxo()

# Get burn address
if len(sys.argv) == 6:
    burnAddress = get_burn_address(sys.argv[5])
else:
    burnAddress = get_burn_address("")

if has_segwit:
    outputTokenPayload = "476a45"
    script_key = "17" + scriptkey_from_private_segwit(privateKey)
else:
    outputTokenPayload = "496a47"
    script_key = "19" + scriptkey_from_private(privateKey)

# Create burn tokens payload
outputTokenPayload += "4466547842" + script_key + "0119" + \
                     scriptpubkey_from_address(burnAddress) + "01" + tokenID + amount

print("payload", outputTokenPayload)

# Print generated burn address and create and print signed raw transaction
print("\nBurn Address:", burnAddress)
print("\nSigned TX:", make_signed_transaction(privateKey, txid, vout, inputAmount, outputTokenPayload, has_segwit))