{
  "manageEntity": {
    "action": "Save",
    "entityId": "457219352",
    "entityType": "Track",
    "nonce": "0xbc062dc8c304befedb6670a55183df4f8ba6d2b979d88fdbd870871ae50464b7",
    "signature": "0x47aba1994380a864301c8251059ed6cb0209c18062d9bf587e9845f94b43a816613bd1241962adcafc79e92a793b6b50c5cc8ccf9eab6fc29661c64d5034411a1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}