{
  "manageEntity": {
    "action": "Save",
    "entityId": "518505198",
    "entityType": "Track",
    "nonce": "0xbef7676e698e06cee89ad1be82dffce53edcbf544de614a7d20d143beec9fbf9",
    "signature": "0x9106ed46679995e35b618f3178bc0a24ef3e85511b20193fd94cd76c95e7e8556aa5944b7b01fa05346f7e6924d14a1346c954025d854754dd39425e03ba1e121c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}