The short of this @mike is storing data on relays in the nkbip kind 30040 and 30041 event formats. Then all supported clients like the ones @Laeserin hosts on imwald, and #alexandria support them :)
Just to be clear, to quote the last line of my post:
"Before you ask, this isn’t a Bitcoin or NOSTR model, but I expect it will evolve into both over time."