Publish a physical asset — a drone, a tennis court, a vehicle, a piano lesson, a flat, a
delivery slot — with bookable utilization windows and a cost, and let
consumers reserve time slots. No signup; an unguessable ownerId is your key.
This ownerId is the only credential for your assets — save it. Anyone
with it can manage them and see your bookings; lose it and there is no recovery.
A manager shares an asset link with you. Opening it shows the available time slots and their cost — pick one to reserve.