How to indicate in did:webs did doc a verification method for authenticity that is a KEL anchored seal

[SmithSamuelM]

The strongest verification method available to an AID controller is to anchor a seal of the hash (SAID) of whatever is to be authenticated. This is stronger than merely signing because the anchor binds the authentication to the key state and an attacker can't later create an anchor with compromised keys from an earlier key state.

So the open question is how to indicate in the did doc that anchoring seals are a verification method .

In a sense, an anchoring seal is similar to an Indy state proof but more granular. Or similar to an Indy Attrib record update but again more granular.