{
  "manageEntity": {
    "action": "Save",
    "entityId": "1538393551",
    "entityType": "Track",
    "nonce": "0x67ac8197ebe52eedc25153ecd6fa64a0414c83540de66cc6220b83b21ef04c37",
    "signature": "0x60a5fcb91b2ef67b891e739453734a2a589cf703b2be48af4c47879d2a2f08905f42d39ddeba45f78a66c4a127cc1270ea84d11375d874ffa2551442df4e364f1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}