{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516121046",
    "entityType": "Track",
    "nonce": "0x21a539f9999a882c95bb0bf38062d1e31c7c7b35997e44c4dc0c2ef577bb026f",
    "signature": "0x9b3ec8accc9cbb2fc4fe630634317475c5fc83a899ef7d303e9f9ad29307bf8c315493b950957376c8d92bfab250b87ec97932e38ada4b11a39a89f7f06748211b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}