{
  "manageEntity": {
    "action": "Save",
    "entityId": "899653167",
    "entityType": "Track",
    "nonce": "0x49d29972cbc6d0b065f2e59e05045c2811af824fbd26af2e6a4a09f87965a865",
    "signature": "0xb3db5581eacbf15f2d336e12b9d8a797c584187166cc457e0c9a7f9bdd917697643c9736137ed55eac78ed8f8337c90e75ed4a74f58c59ca8539014fc67465751b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}