{
  "manageEntity": {
    "action": "Save",
    "entityId": "440273406",
    "entityType": "Track",
    "nonce": "0xff96be68e87ea9c4576ab341b3025fd09654e540f80e34454244ff5c687949db",
    "signature": "0xd1042133f27e63763e52970feb1c8b88dea1771d9dd769325d61adbfb0ce25b248302f2175c8fc036ca4ff82bc1ed87b067565b7b0f09c6f363464a490763df01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}