The updatedBy field on ChainOfCustody tracks the last person to modify the record — for example, someone who added the receivedAt date and coolerTempC after the lab sent their receipt confirmation. In regulated environments, any post-creation edits to a CoC record may need to be justified during audits. Knowing who made the last change, combined with the updatedAt timestamp, gives compliance reviewers the information they need to assess whether a modification was appropriate.
Technical section
Data model, API, and internals — visible to developers.