{"ok":true,"service":"signing-secret-rotation","mode":"read_signing_versions","api_path":"/api/signing-secret-rotation","active_signing_version":"mrs_v1","signing_versions":[{"signing_version":"mrs_v1","state":"active","key_id":"sandbox_signing_key_v1","algorithm":"hmac_sha256"}],"rotation_policy":"new signatures use active version; old signatures verify by declared version","timestamp":"2026-06-21T11:50:53.596Z"}