{
  "manageEntity": {
    "action": "Save",
    "entityId": "349579180",
    "entityType": "Track",
    "nonce": "0xa0416f10026c44bfb5350c75972c6f40d8ccb56a4e8fda95a8a41f3874ba075d",
    "signature": "0xcf032e0692030ad7ac574278af2030463694d95d55a4958a72674f41d0f5551565d81c15fc17d5d44b45da3d28e41288613c41edbffca98212277b850e30a7041c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}