{
  "manageEntity": {
    "action": "Save",
    "entityId": "643225750",
    "entityType": "Track",
    "nonce": "0xf7bec9dc8df174f75ff677d70cff0b94a1b96ba5f10253ccae74599e786ff05a",
    "signature": "0x79d1698398b53d690a181eb78674e360c799934f3df299991ebfa27a52bdd5590d854072e8f3a168b44ee30e3aaccb797fb47667a5836583ab9ee8ddef133d591b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}