e.proof.sig.¶
e.proof.sig. is a match pattern, never a code. It selects every code below it, including ones minted after your handler was written.
Codes under this prefix¶
e.proof.sig.f— The signature doesn't match the data under the signer's key state.e.proof.sig.grant.f— The grant's signature does not verify against its sender's current key state, so I won't admit it.