{
  "manageEntity": {
    "action": "Save",
    "entityId": "1510207410",
    "entityType": "Track",
    "nonce": "0x0ffe36cbf602287606151b7cc4b0cdf1e5799340f1013d2413eef3b8d100db5a",
    "signature": "0x30cb9a75d47891073da33f5bb847382a2ec842982a93ef3c03363049aa8a23936463ae1160ea5b2788b6a2fbc9364eeb77ed7d7fbd66a9b4e0caea89b2100af91c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}