Flashbots Header Signer
This module provides a utility for creating signed headers to interact with the Flashbots service. It helps address issues with Web3 version compatibility when making requests to Flashbots.
Problem Description
Developers frequently encounter the following error when interacting with Flashbots:
json
{
"id": 1,
"error": {
"code": -32600,
"message": "error in signature check 0xYOURADDRESS"
},
"jsonrpc": "2.0"
}
This error usually occurs due to improper message signing or Web3 version inconsistencies. This module was created to resolve these issues by ensuring correct message formatting and signing.
How It Works
Flashbots requires correctly signed headers to send transactions. This module provides an easy-to-use interface to generate these signed headers while handling different Web3 versions seamlessly (tested with Web3 6.x.x and 7.x.x).
Setup and Installation
* Create a new directory: First, create a new directory for your project:
bash
mkdir NewProject
* Navigate to the project directory: Move into the newly created directory:
bash
cd NewProject
* Create and activate a virtual environment:
To create and activate a virtual environment, you can use the following commands:
For Linux/MacOS:
bash
python -m venv venv Create a virtual environment
source venv/bin/activate Activate the environment
For Windows:
bash
python -m venv venv Create a virtual environment
venv\Scripts\activate Activate the environment
Installation from Pip
* Install package directly from Pip:
bash
pip install flashbots-header-signer
Installation from GitHub
* Install package directly from GitHub:
bash
pip install git+https://github.com/onium16/flashbots-header-signer.git
Requirements
* Install the required dependencies via pip:
bash
pip install -r requirements.txt
Installation for test
* Clone the repository:
bash
git clone https://github.com/onium16/flashbots-header-signer.git
cd flashbots-header-signer
To create and activate a virtual environment, you can use the following commands:
bash
python -m venv venv Create a virtual environment
source venv/bin/activate Activate the environment (for Linux/MacOS)
venv\Scripts\activate Activate the environment (for Windows)
** For more detailed information about working with virtual environments in Python, you can refer to the official documentation on venv [https://docs.python.org/3/library/venv.html](https://docs.python.org/3/library/venv.html).
Example for Web3 6.x.x
bash
pip install -r tests/requirements_6.txt
Example for Web3 7.x.x
bash
pip install -r tests/requirements_7.txt
Usage Example (Basic)
python
from flashbots_header_signer import FlashbotsHeaderSigner
FLASHBOTS_PRIVATE_KEY = "0x0000000000000000000000000000000000000000000000000000000000000001"
URL for the Flashbots relay
url = "https://relay.flashbots.net/"
Pass the private key to FlashbotsHeaderSigner
signer = FlashbotsHeaderSigner(private_key=FLASHBOTS_PRIVATE_KEY, log_level="DEBUG")
Tx data in string format
tx_body = '{"jsonrpc": "2.0", "id": 1, "method": "eth_sendBundle", "params": [{"txs": ["0x0", "0x0", "0x0"], "blockNumber": "0x151962a", "minTimestamp": 0, "maxTimestamp": 0, "revertingTxHashes": []}]}'
Generate Flashbots header (this method is not async but involves no async operations)
headers_json = signer.generate_flashbots_header(tx_body)
print(f"Generated headers: {headers_json}")
Result:
bash
Generated headers: {'Content-Type': 'application/json', 'X-Flashbots-Signature': '0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf:0x97a2015ef4e0360724deb78837826161d242cf16ac4d349078f8dd9b36b7db9e37748978438f57e8b5e10782126b07a6533b6b9362a3f9bfaa15f7c159ea6d731b'}
Usage Example (Advanced)
python
example.py
import asyncio
import logging
import aiohttp
from flashbots_header_signer import FlashbotsHeaderSigner
from eth_account import Account
Configure logging
logging.basicConfig(
level=logging.DEBUG,
format="%(asctime)s [%(levelname)s] Line: %(lineno)d - %(message)s"
)
logger = logging.getLogger(__name__)
def _generate_private_key():
"""
Generates a new Ethereum private key and address.
Returns:
private_key (str): The newly generated Ethereum private key in hexadecimal format.
address (str): The Ethereum address associated with the private key.
"""
account = Account.create()
Access the private key correctly using _private_key
private_key = account._private_key.hex()
address = account.address
logger.debug(f"New private key: {private_key[:5]+'...'+private_key[-5:]}")
logger.debug(f"New address: {address[:5]+'...'+address[-5:]}")
return private_key, address
async def main():
try:
Generate private key and address
FLASHBOTS_PRIVATE_KEY = "0x0000000000000000000000000000000000000000000000000000000000000001"
FLASHBOTS_PRIVATE_KEY, FLASHBOTS_ADDRESS = _generate_private_key()
Pass the private key to FlashbotsHeaderSigner
signer = FlashbotsHeaderSigner(private_key=FLASHBOTS_PRIVATE_KEY, log_level="DEBUG")
url = "https://relay.flashbots.net/"
tx_body = '{"jsonrpc": "2.0", "id": 1, "method": "eth_sendBundle", "params": [{"txs": ["0x0", "0x0", "0x0"], "blockNumber": "0x151962a", "minTimestamp": 0, "maxTimestamp": 0, "revertingTxHashes": []}]}'
try:
Generate Flashbots header (this method is not async but involves no async operations)
headers_json = signer.generate_flashbots_header(tx_body)
logger.debug(f"Generated headers: {headers_json}")
except TypeError as e:
logger.error(f"Error generating Flashbots header: {e}")
return
except Exception as e:
logger.error(f"Unexpected error during header generation: {e}")
return
try:
Send the request to Flashbots (this is async and should be awaited)
response = await signer.send_request(url, headers_json, tx_body)
logger.info(f"Final Response: {response}")
except aiohttp.ClientError as e:
logger.error(f"HTTP error occurred while sending the request: {e}")
except Exception as e:
logger.error(f"Unexpected error while sending the request: {e}")
except ValueError as e:
logger.error(f"ValueError: {e}")
except Exception as e:
logger.error(f"Unexpected error in main function: {e}")
if __name__ == "__main__":
asyncio.run(main())
Expected Output:
**Note:
Ignore the 400 error and the message containing "error" in the response. This happened because placeholder data ("txs": ["0x0", "0x0", "0x0"]) was used when sending the message to the server. The server's response indicates the analysis of the entire message, and the signature has been formed correctly.**
**Once you replace the placeholder data in "txs" and "blockNumber" with actual values, the server will return a response like this:**