{
  "manageEntity": {
    "action": "Save",
    "entityId": "562304026",
    "entityType": "Track",
    "nonce": "0xf56293395ff4b9408f1ed530b9bdbe8c399782bec4e77c7febe52c3924ca6b41",
    "signature": "0xe28d0cad7c150638078351638b5f2fb1918e9db56f69c47845be1e9332cf573155f0fa2815c16e1ec6fc1c6928dc618f3de49f5378e9473ded0403d4436ea8921c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}