🔐 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.

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📌 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.

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📂 Requirements

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

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⚙️ Installation

1. Clone the repository:

git clone https://github.com/jalfr3d/btc-transaction-signer.git

2. Install the required dependencies:

pip install -r requirements.txt

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📌 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.

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💡 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.

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📝 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').

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📜 License

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

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❤️ Donation

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