Document digital signature.
| Name | Type | Description | Notes |
|---|---|---|---|
| name | str | Name. | |
| issued_by | str | Signature issued by. | |
| issuer_name | str | Signature issuer name. | |
| valid_from_utc | datetime | Signature valid from datatime in UTC timezone. | |
| valid_to_utc | datetime | Signature valid to datatime in UTC timezone. |