{
  "manageEntity": {
    "action": "Save",
    "entityId": "509443002",
    "entityType": "Track",
    "nonce": "0x8bbdb0682ee701f6d3e3502d0f336098b90981001f2f39392a9012455a322c7a",
    "signature": "0xc11d5863d1009029edfcf034b7e3e23e4bd8db6a00b661bb7bd8896308b74fbb614feee1f560c65f67f9b44754d4d5d85c1ad8e9774ebbe6cfd954bbf548f29d1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}