{
  "manageEntity": {
    "action": "Save",
    "entityId": "438477",
    "entityType": "Track",
    "nonce": "0x8f29f5052f164b94296d2435850ed3744f1677fdf1ebb6a105e9b6d15791cb5a",
    "signature": "0x1233781b9e1c5d6f581382a48d9224104c0350b2f3ba82a35386be225eb419087d36303d7c9bef7d91a81b22468ff0120d413433c9f7ed2dd23fa51aa902895b1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}