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Development Guide

Selector Bruteforce Tool

When developing proxy contracts that need specific function selectors (e.g., matching IERC20.transferFrom selector 0x23b872dd), use the selector bruteforce tool from:

https://github.com/1inch/smart-contract-helper-utils/src

Usage Example

To find a function name with custom suffix that produces the transferFrom selector:

python selector_bruteforce.py \
  --target 0x23b872dd \
  --params "address,address,uint256,((address,uint256),uint256,uint256),bytes" \
  --prefix "func_" \
  --fast

This is used for contracts like Permit2Proxy and Permit2WitnessProxy where the proxy function must have the same selector as transferFrom to work with the limit order protocol's extension mechanism.