Online verification result. Authenticated calls always return HTTP 200 with this body (valid: true or valid: false); unknown/expired exports do not use 404.
| Name | Type | Description | Notes |
|---|---|---|---|
| valid | Boolean | Whether the stored export matches the supplied verification hash and address within retention. | |
| expiresAt | String | Inclusive last UTC calendar day (`YYYY-MM-DD`) when `valid` is true; empty string when `valid` is false. |