Was testing various incantations of “snap known” against different assertion types and, even though asserts.go seems to claim that “authority-delegation” is a recognized assertion type, what I get is:
$ snap known authority-delegation
error: invalid assert type: "authority-delegation"
Perhaps for that assertion type I need to supply more arguments to make it a valid query, but that error message just claims that that is not a valid type.
Thoughts? All other assertion types either return content or null.