First let me explain my development environment. I am using Jupyter Notebook to play around with the Web3.py front-end code and Remix for the Solidity smart contract code. I am using the Metamask wallet
firstly i configure the Metamask wallet to pick the Rinkeby network. The i use the Remix IDE to configure it to use Rinkeby, using Injected Web3.
I want to connect to the Rinkeby testnet, using an Infura RPC URL like this;
and i succeed in doing so through the Web3.py code.
when i call a function, which is a call and not a state modifying function, it works fine
e.g the below code works
contract.functions.getMessage().call() # displays a message string
However, whenever i try to make a transaction or call a state modifying function in the contract, say something like
tx_hash = contract.functions.setMessage('Call from Jupyter').transact()
It gives me the following error
The field extraData is 97 bytes, but should be 32. It is quite likely that you are connected to a POA chain.
Refer http://web3py.readthedocs.io/en/stable/middleware.html#geth-style-proof-of-authority for more details.
The full extraData is: HexBytes('0xd883010900846765746888676f312e31322e34856c696e757800000000000000d2c6d883001d158bf0718c1dc64b2809d4c90c9a9450324c22be595e598205e85f5f73d61bd864b3aac4e7ec8f101564cde8faf72cd3ef52b15d3c8a3c6ab6c900')
( I have spaced out the error, into 3 parts, to allow for more legibility )
From what i read in the provided link, i have to use Geth or Parity to successfully conduct transactions on test networks like Rinkeby.
I am also quite confused with the IPC provider mentioned in the above link. I have no idea how to use it ( i think it conflicts with HTTP provider, which is what i intend to use. but feel free to elaborate and clear up any misconceptions on this )
However, if i don't want to use Geth or Parity, is there any method i can use to connect to Rinkeby and conduct transactions by simply using my Infura URL and Web3.py ?
Please let me know any prospective solution or even any relevant work around to this issue