Digital provenance passports for the pieces you sell. Three pages on the jeweller-facing side — how you issue a passport, how you log an ownership transfer when a piece resells, and how you manage the existing population once it's out in the world. The customer-side view of the public /verify card lives one section over, under Customer-Facing Surfaces.
How to attach a passport to a piece — at point of sale or retroactively — what the customer receives, and the shape of the UID that powers the public verify surface.
When a piece resells through you, log the ownership change against the passport so the chain of custody on /verify stays accurate. Append-only by design — covered inside.
Browsing the full passport list, recording lifecycle events (repairs, lost / stolen, recovered), editing details, controlling public visibility, and reading the event timeline as the audit trail.