{
  "manageEntity": {
    "action": "Save",
    "entityId": "297002558",
    "entityType": "Track",
    "nonce": "0x12b764691cd10f996a00caf711a2886f6e6df0418dbff78b3a9f2b648d9e0690",
    "signature": "0x25ebc9e230c58c4650bf2b6616aad6e466f317bd87f765fa459d40e47e09e31333c6a1ee8bebe5b8f0a5984809294bb2d25a6fef26377283bd9750740e4255211c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}