IngwiePhoenix on Nostr: fiatjaf What's the best way to find unused kind-numbers? I am looking for one to ...

fiatjaf (npub180c…h6w6) What's the best way to find unused kind-numbers? I am looking for one to effectively store a (big) JSON document with a bit of metadata in the tags and make it editable... but no idea what number to use, which ones are taken and what not o.o
Got an idea?