@silverpill @rfc9421 hi i'm a dummy. So rfc9421 is "newer" than content message signing, which AP already has? Is the double knocking, as copilot tells me, for backwards compatibility for older clients?
does RFC9421 sign the content itself? a skim shows headers, methods, and URI. either way, i guess rfc9421 signing means that activitypub can go through protocol specific "routers" and proxies and the like, transparently?
i don't read RFCs for fun, unless they have a DOI (they probably do...)