it's just signing a special type of event and a different envelope, it's really not hard, the spec has existed, and fiatjaf's implementation has been out there for maybe 6 months now, it's just a matter of priorities... nostr:npub18kzz4lkdtc5n729kvfunxuz287uvu9f64ywhjz43ra482t2y5sks0mx5sz sorta gets it but doesn't get it that relays need to all start implementing the capability... idk if he's open sourced the strfry sprocket for it but the lack of reference implementations on the relay side is a big problem too

khatru can already do it tho...