{"id":"s3-presigned-secret-is-class-level","text":"`_SECRET` is generated once per class load (`uuid4().hex`), not per instance, so all `ObjectStorage` instances in the same process share the same HMAC signing key.","truth_value":"IN","source":"entries/2026/06/05/s3-object-storage-s3_object_storage.md","source_url":"","source_hash":"","justifications":[],"dependents":["data-isolation-gaps-parallel-access-control-gaps"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"s3-presigned-secret-is-class-level","truth_value":"IN","reason":"premise"}]}}