My intent is to provide users with the ability to revoke trust if in a source of information if they realize it is malicious, and to gossip that revocation among their peers.

RFC 7469 appears to be more geared towards service providers attempting to protect their users. Laudable, but we're still assuming we know something about who the user deems trustworthy, which I think is presumptuous.

It's one thing to suss out cases where somebody is lying about their name, that's pretty cut and dry. But ever since web2.0 there's no longer much of an association between the hostname and the trustworthiness of the content. If we instead provided a means of validating the content's provenance it wouldn't much matter which host was involved in its delivery.