@cft I can see the point in including the seqnum, but I'm still not sold on including the author. The author is already implicit in the signature. When you request a message by hash, the peer answering the request can just tell you the author, and you verify it via the signature. Of course they could lie to you and give you a bogus author, but since this is immediately detected by the failed signature verification, that's just as if they never answered your request in the first place.