A place for talking about the Ethereum Virtual Machine on Farcaster.

what is the most reliable way of attaching metadata to an ethereum transaction?

cases that need to be handled:
1. EOA tx
2. UserOp
3. batch call directly on smart account

calldata suffix is the first thing that comes to mind but fetching userops is potentially expensive and it requires tracing to handle (3)

How much metadata do you want to store? I wonder whether you could encode some data within access lists.
Actually I guess that wouldn't work for userops unless you are also operating the bundler