{
  "manageEntity": {
    "action": "Save",
    "entityId": "189131735",
    "entityType": "Track",
    "nonce": "0x3a8e65d57f42c7861f4002d9058196c0a4bf2c5ea473262cd4cb1b0614157660",
    "signature": "0x696d236bbb4a81a048384ce3b0f9adde0c44cbf5fcad4dd062760e997ec6b3b11e54c947e4e987febffdd993e3c5ab1892d0e637e8373978422873f1037748831b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}