{
  "manageEntity": {
    "action": "Save",
    "entityId": "637450452",
    "entityType": "Track",
    "nonce": "0xa385a922f8a51439ee0cdad097c6fd7e3877596b98811e701038abefea806182",
    "signature": "0x89a4dcb76b6e493bcde84da03995d9b4e8d7d566b5c316c13dd39a1aa563b9713ce99330fbfb4ca65ff8cc8ec393498695735a20764f287fd3cb1e481e2386be1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}