Creating a Bitcoin RawTX with Python
Here’s a Python script that creates a Bitcoin RawTX transaction with a positive balance of BTC coins using a private key, along with explanations for each step:
# Import necessary libraries
from bitcoinutils.setup import setup
from bitcoinutils.transactions import Transaction, TxInput, TxOutput
from bitcoinutils.keys import PrivateKey, P2pkhAddress
# Initialize Bitcoin network
setup('testnet') # Change to 'mainnet' for main network
# Set private key (replace with your actual private key)
private_key = PrivateKey("YOUR_PRIVATE_KEY_HERE")
# Get the corresponding public key and address
public_key = private_key.get_public_key()
address = public_key.get_address()
# Set transaction inputs (replace with your actual UTXO)
# You'll need the txid, output index, and amount
txid = "YOUR_UTXO_TXID"
output_index = 0
amount = 0.001 # Replace with the actual UTXO amount
# Create a TxInput object
tx_input = TxInput(txid, output_index, amount)
# Set transaction outputs
# Replace with the recipient address and amount to send
recipient_address = "RECIPIENT_ADDRESS"
amount_to_send = 0.0005 # Ensure it's less than the input amount
# Calculate the transaction fee
fee = 0.0001 # Adjust as needed
# Create a TxOutput object
tx_output = TxOutput(amount_to_send, recipient_address)
# Create a change output to send remaining balance back to yourself
change_amount = amount - amount_to_send - fee
change_output = TxOutput(change_amount, address)
# Create the transaction
tx = Transaction([tx_input], [tx_output, change_output])
# Sign the transaction
tx.sign_input(0, private_key)
# Get the raw transaction in hex format
raw_tx = tx.serialize()
# Print the raw transaction
print(raw_tx)
Explanation:
- Import Libraries: We import necessary libraries from
bitcoinutils
to work with Bitcoin transactions, keys, and addresses. - Setup Network: We initialize the Bitcoin network using
setup
. Changetestnet
tomainnet
if you’re working on the main Bitcoin network. - Private Key: Replace
"YOUR_PRIVATE_KEY_HERE"
with your actual private key in WIF format. - Public Key and Address: We derive the corresponding public key and address from the private key.
- Transaction Inputs:
- Replace
"YOUR_UTXO_TXID"
,output_index
, andamount
with the details of your unspent transaction output (UTXO). - We create a
TxInput
object representing the input to the transaction.
- Replace
- Transaction Outputs:
- Replace
"RECIPIENT_ADDRESS"
with the recipient’s Bitcoin address and set theamount_to_send
. - We also calculate the change amount to send back to ourselves.
- We create
TxOutput
objects for both the recipient and the change.
- Replace
- Transaction Creation: We create a
Transaction
object with the specified inputs and outputs. - Transaction Signing: We sign the transaction input using the private key.
- Raw Transaction: We serialize the transaction to get the raw transaction in hex format.
- Output: Finally, we print the raw transaction which can be broadcasted to the Bitcoin network.
Important Notes:
- Replace placeholders: Make sure to replace all placeholder values with your actual data.
- UTXO: You need to have a UTXO with enough balance to cover the amount you want to send and the transaction fee.
- Fees: Adjust the
fee
variable to reflect the current network fee conditions. - Security: Be extremely cautious with your private key. Never share it with anyone and store it securely.
Additional Considerations:
- This script demonstrates a basic transaction. You can extend it to support more complex scenarios, such as multi-signature transactions or time-locked transactions.
- Consider using a library like
blockcypher
or a Bitcoin node’s RPC interface for broadcasting the raw transaction to the network.
Creating a Bitcoin RawTX Transaction with Python
Here’s a Python script that creates a Bitcoin RawTX transaction with a positive balance of BTC coins using a private key. Please note that this is a basic example and you might need to adapt it based on your specific needs and the current state of the Bitcoin network.
Dependencies:
You’ll need to install the following Python libraries:
bitcoin
base58
pip install bitcoin base58
Script:
from bitcoin import SelectParams
from bitcoin.core import CMutableTransaction, x, b2x, lx, COIN, COutPoint, CMutableTxOut
from bitcoin.core.script import CScript, OP_DUP, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG
from bitcoin.wallet import CBitcoinSecret, P2PKHBitcoinAddress
def create_raw_transaction(private_key_wif, recipient_address, amount_btc, fee_btc=0.0001):
# Select the network (mainnet, testnet, etc.)
SelectParams('mainnet')
# Convert WIF to private key
secret = CBitcoinSecret(private_key_wif)
# Get the public key and address
pubkey = secret.pub
address = P2PKHBitcoinAddress.from_pubkey(pubkey)
# Get unspent outputs (UTXOs) for the address
# In a real application, you would need to query a block explorer or use a library like ElectrumX
utxos = [
# Replace this with your actual UTXOs
{
'txid': 'your_transaction_id',
'vout': 0,
'value': 50000000 # Value in Satoshis (5 BTC in this example)
}
]
# Calculate total input amount and output amount
total_input = sum([utxo['value'] for utxo in utxos])
amount_satoshis = int(amount_btc * COIN)
fee_satoshis = int(fee_btc * COIN)
total_output = amount_satoshis + fee_satoshis
# Check if there are enough funds
if total_input < total_output:
raise ValueError('Insufficient funds')
# Create the transaction
tx = CMutableTransaction()
# Add inputs
for utxo in utxos:
txin = CMutableTxIn(COutPoint(lx(utxo['txid']), utxo['vout']))
tx.vin.append(txin)
# Add output
txout = CMutableTxOut(amount_satoshis, CScript([OP_DUP, OP_HASH160, address, OP_EQUALVERIFY, OP_CHECKSIG]))
tx.vout.append(txout)
# Add change output (if necessary)
if total_input > total_output:
change_satoshis = total_input - total_output
change_txout = CMutableTxOut(change_satoshis, CScript([OP_DUP, OP_HASH160, address, OP_EQUALVERIFY, OP_CHECKSIG]))
tx.vout.append(change_txout)
# Sign the transaction
for i, txin in enumerate(tx.vin):
sig = secret.sign(tx.SignatureHash(i))
txin.scriptSig = CScript([sig, pubkey])
# Return the raw transaction in hex format
return b2x(tx.serialize())
# Example usage
private_key_wif = 'your_private_key_wif'
recipient_address = 'recipient_bitcoin_address'
amount_btc = 0.1
raw_tx = create_raw_transaction(private_key_wif, recipient_address, amount_btc)
print(f"Raw transaction: {raw_tx}")
Explanation:
- Dependencies: We import the necessary libraries for working with Bitcoin transactions and addresses.
create_raw_transaction()
function: This function takes the private key in WIF format, recipient address, amount to send, and optional fee as input.- Network Selection: We select the Bitcoin network (mainnet in this example) using
SelectParams
. - Key Conversion: The private key WIF is converted to a
CBitcoinSecret
object. - Public Key and Address: We derive the public key and address from the private key.
- UTXOs: You need to replace the placeholder UTXO information with your actual UTXOs obtained from a block explorer or wallet software.
- Amount Calculation: The script calculates the total input amount from UTXOs, the output amount in Satoshis, and the fee.
- Funds Check: It ensures there are sufficient funds in the UTXOs to cover the output amount and fee.
- Transaction Creation: A
CMutableTransaction
object is created to build the transaction. - Inputs: The UTXOs are added as inputs to the transaction using
CMutableTxIn
. - Outputs: An output is created for the recipient address with the specified amount using
CMutableTxOut
. - Change Output: If there’s remaining balance after sending the desired amount and paying the fee, a change output is created to send the remaining funds back to the sender’s address.
- Signing: The transaction is signed using the private key for each input.
- Raw Transaction: The serialized and hex-encoded raw transaction is returned.
- Example Usage: The script demonstrates how to use the function with sample data. You need to replace the placeholders with your actual private key, recipient address, and amount.
Important Considerations:
- Security: Never share your private keys publicly. This script is for educational purposes only.
- UTXOs: You need to obtain your UTXOs from a reliable source like a block explorer or your wallet software.
- Fees: Adjust the fee based on current network conditions to ensure timely confirmation of your transaction.
- Error Handling: Implement proper error handling and input validation in a production environment.