{
  "manageEntity": {
    "action": "Save",
    "entityId": "564879551",
    "entityType": "Track",
    "nonce": "0x18c420a10bfb1d5dd39ed94adb2ac0efbe9fef2d24bc87c375335d62b99a5b63",
    "signature": "0x034257f3cfc2760105161076b175cb022a26d5dd57a3f3fae0cf5b76c34e3b483bc8962e22dde80059f584cfa82db8e91b945b8309a14e3dd39181ccd798320a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}