{
  "artifact": {
    "description": "Credentials for docker-mailserver: SMTP relay auth and admin mailbox.",
    "id": "mailserver",
    "layers": [
      {
        "description": "contract.ncl — MailserverSecrets field definitions",
        "media_type": "application/vnd.ontoref.domain.contract.v1",
        "required": true
      }
    ],
    "media_type": "application/vnd.ontoref.domain.v1",
    "uses_registry": "primary",
    "version": "1.0.0"
  }
}