{
  "manageEntity": {
    "action": "Save",
    "entityId": "645282059",
    "entityType": "Track",
    "nonce": "0x3821da07746719516aa49f5d9fd46631d8f0ee681abcb4949103d484b777753f",
    "signature": "0x019d8bf7111cf96665d304511e1c00edbea302f0914ebcd6512a846d7f6b575f4fabd1ec232ae8f450e6114771b194020fce70098b048c2556dfc5d80da9a59b1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}