{
  "manageEntity": {
    "action": "Save",
    "entityId": "428378",
    "entityType": "Track",
    "nonce": "0xf47d22e80e5df4e725482281fa493a84d52932d945d9dac98e41ef6735850348",
    "signature": "0x757fc9b08c8bf58e944a1a68e0d4b51396b79dfe35d38cd27eb10444cb17af471f1d7fff6e475459800991a22bd206f965a8c19f8ed68b23ab55d56cfe7b09751c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}