Get contract address from CREATE and CREATE2 opcode

[tinom9]

What was wrong?

Unlike ethers.js (5.7.2), web3.py does not include a utility method to deterministically determine the contract address from the inputs of CREATE and CREATE2 opcodes.

How can it be fixed?

The address of a CREATE opcode deployed contract can be determined as a function of its sender and its respective nonce:

new_address = hash(sender, nonce)

And the address of a CREATE2 opcode deployed contract can be determined as a function of a constant 0xFF, its sender, an arbitrary value salt and the contract's bytecode:

new_address = hash(0xFF, sender, salt, bytecode)