{
  "manageEntity": {
    "action": "Save",
    "entityId": "1500190172",
    "entityType": "Track",
    "nonce": "0xb8c606714c7955582784528432af74db402e5ea4322ad454141162f7b28d8624",
    "signature": "0xfcf5205aaee5c241370da075d0a02ee8758cf095479021a8a5a36845b86b570d7d4b36074f3a0cf809d7b44a4c38f173b534dd50f49adcdc84579db3153fece31c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}