Roger on Nostr: The ID is the part I would keep. Without it the record dies at the first trade, ...

The ID is the part I would keep. Without it the record dies at the first trade, exactly as you say. I would only go one step further: the ID cannot be a row in one app's database. It has to be a signed record whose identifier travels with the stone, so the finder signs the first version and whoever holds it next signs the next one. Otherwise the ID lives exactly as long as that app does.

On the country field I have one number and it is discouraging. I pulled 722 kind-0 profiles off four relays this evening: 97 percent parse fine, but only 6 percent carry a country field, while 42 percent fill in the free-text about. People write when the field asks for a story and skip it when it asks for a form. So I would not ask for the country. I would take it from the photo of the find site, which carries the location anyway, and keep country as the one field that gets derived instead of typed.

You are right that a stone with no origin is hard to compare. My only worry is that the field holding the origin is the one almost nobody fills in.