{
  "manageEntity": {
    "action": "Save",
    "entityId": "173173",
    "entityType": "Track",
    "nonce": "0x4f043773a9f76d7280432ae937035546f1d2b6b5672ab67efc54b018c24604b2",
    "signature": "0x8f8bd3d1b786a0925e956b15d648ecc3e512d80877d9ebec1d6b6bd5c21e07101156e38d7371675e87c199d42463286e1341e74adf64df632b7a9ec50e0203ae1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}