{
  "manageEntity": {
    "action": "Save",
    "entityId": "193136",
    "entityType": "Track",
    "nonce": "0x37390fbc4a09c4867c6b5efd9bbb966507b499809919d2a0bf7e0cb3e6f8063a",
    "signature": "0x9aa38c1b5b5a22cd71d524ceb87587cf53eb0d9adcedb6026f50f6c1cfa9ed1957321bb8fa863b4aaf447bb87b89d2707950bf28ea6098972533f9f15a1db22a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}