Automotive.
Automotive supply chains move serialized parts through tiers of suppliers. An EPCIS 2.0 event records which party observed a part at a step; the gateway stamps the warrantor and grades the asserted observer, so the chain of custody carries who stands behind each record and how strongly the observer is attested.
whospine:capturedBy
One shipping event, both grains on it.
"type": "ObjectEvent",
"action": "OBSERVE",
"bizStep": "shipping",
"epcList": [ "https://id.gs1.org/01/09520123456788/21/A6-114" ],
"who": "did:human:line-qa-04", // asserted, graded
"spine:capturedBy": "acct:tier1-plant", // stamped
"spine:attestationGrade": "claimed", // the door's grade
"recordTime": "2026-07-30T06:12:41Z" // stampedIllustrative: a serialized part leaves a tier-1 plant. The stamped fields are the gateway's; the asserted field is the caller's, graded. The shapes are the implemented envelope; the values are invented.
For the platform engineer at the tier-1.
A warranty dispute two tiers downstream reads this chain out of context, which is exactly the test: validated against GS1's official schema at capture, identified by the CBV 2.0 §8.9 hash, appended and never edited. You can run the interface yourself and check every one of those claims by exit code; the dated ledger is on What ships today.
Proof, not adjectives. The gateway's conformance tests pass against GS1's normative artifacts. See Who for the dimension, and What ships today for the dated ledger.