Is there some kind of relay registration that I should do which is similar to https://docs.flashbots.net/flashbots-auction/quick-start#how-to-send-your-first-flashbots-bundle?
I also noticed that there is a --builder.relay_secret_key parameter that I have left default. The description says that this is the Builder local relay API key used for signing headers.
Is this also being used for remote relays and might this be the source of the invalid signature issue?
Appreciate any insight!