What should be listed as parameters for signature in the protocol?

[adityasaky]

protocol.md has a list of parameters that seems to pertain to the definition of a signature and how it is computed in DSSE. The parameters list currently includes KEYID , which is not part of the signature computation. This raised the question of what must be listed as parameters in the proposal to add signature extensions to DSSE.

Original thread: https://github.com/secure-systems-lab/dsse/pull/61/files#r1477947387