# Bitcoin Transaction Signing Script (P2PKH)

# Author: YOUR_NAME

# License: MIT

# -------------------------------------------

# This script demonstrates how to construct and sign a Bitcoin transaction

# using a private key (WIF format) and raw transaction components.

from bitcoinlib.keys import Key

from bitcoinlib.transactions import Transaction

from bitcoinlib.services.services import Service

# Set the network: 'bitcoin' for mainnet, 'testnet' for testnet usage

network = 'testnet' # Change to 'bitcoin' for mainnet

# Private key in Wallet Import Format (WIF)

private_key_wif = 'cTxXXXXXXX_REPLACE_WITH_YOUR_TESTNET_WIF' # Example testnet WIF

# Previous UTXO details

prev_txid = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'

vout_index = 0

input_amount_satoshi = 100000 # 0.001 BTC

# Destination details

destination_address = 'tb1qxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' # Testnet address

send_amount_satoshi = 90000

fee_satoshi = input_amount_satoshi - send_amount_satoshi

# Build key from WIF

key = Key(import_key=private_key_wif, network=network)

# Create transaction

tx = Transaction(network=network)

tx.add_input(prev_txid, vout_index, input_amount_satoshi, address=key.address)

tx.add_output(send_amount_satoshi, destination_address)

# Sign transaction

tx.sign(keys=[key])

# Print the signed transaction

raw_signed_tx = tx.as_hex()

print("\n🔐 Raw Signed Transaction:")

print(raw_signed_tx)

# (Optional) Broadcast the transaction

broadcast = False # Set to True if you want to broadcast

if broadcast:

service = Service(network=network)

tx_id = service.sendrawtransaction(raw_signed_tx)

print("\n✅ Transaction successfully broadcasted!")

print("TXID:", tx_id)