{
  "manageEntity": {
    "action": "Save",
    "entityId": "843193444",
    "entityType": "Track",
    "nonce": "0x1a88f65251a643606756c43ccee1ead1f1d3577800e48fcfe6b45cefd7524bde",
    "signature": "0xf77aa659a86eaa7bd6864e8ce8410ddba445094770ccd4ef8fa82f08a762f8a72273b34762dbf0dff4cd712dc400db2bf22c4946b6c9071b86d758b6a01c06a41c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}