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🔐 Bitcoin Transaction Signer

This project demonstrates how to sign a Bitcoin transaction offline using the bitcoin Python library. The script allows you to generate a transaction hex using a WIF (Wallet Import Format) private key, receiver's legacy wallet address, and UTXOs (Unspent Transaction Outputs) data.

📌 Features

  • Generate raw Bitcoin transaction hexes offline.
  • Support for WIF private keys.
  • Transaction output can be broadcasted online using services like Slipstream Mara.
  • It is perfect if you find any of the private key of the BTC Puzzle challenge.

📂 Requirements

  • Python 3.x
  • bitcoin library
  • base58 library
  • ecdsa library

⚙️ Installation

  1. Clone the repository:
git clone https://github.com/jalfr3d/btc-transaction-signer.git
  1. Install the required dependencies:
pip install -r requirements.txt

📌 Usage

  1. Edit main.py with your private key, receiver's address, and UTXO data.
  2. Run the script.
  3. The script will output the transaction hex.

💡 Example Usage

private_key_wif = "<your_wif_private_key>"
to_address = "1YourLegacyAddressHere"
utxos = [
    {"txid": "d14fa6c0c8e88bc74e420b8f678a3143f396a648315c911970971ef57ef59e3c", "vout": 0, "value": 612000},
    {"txid": "b9a2588b6bb080c7788dbcebb44d3eb84fd7c27a8a1e376a2d4cdef3f21b8be3", "vout": 1, "value": 61200}
]
amount = 6.8
fee_rate = 20

transaction_hex = create_raw_transaction(private_key_wif, to_address, utxos, amount, fee_rate)
print("Raw Transaction Hex:", transaction_hex)
  • The UTXOS data load in the main.py are from the Puzzle 68.

📝 Important Notes

  • Ensure your private key is stored securely and never exposed online.
  • The generated transaction hex must be broadcasted online manually.
  • This script currently supports legacy addresses (starting with '1').

📜 License

This project is licensed under the MIT License - see the LICENSE file for details.

❤️ Donation

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