{
  "manageEntity": {
    "action": "Save",
    "entityId": "540702013",
    "entityType": "Track",
    "nonce": "0xbbf396226fc78286de190e594d132557aab5885502f46fb0a960a0400d311d15",
    "signature": "0x63c7de9974d42fe6edbc376c8ef475595099dc2aa406cc7533bde522cb0560c846f2253310b05d7f120afdb9200fdc96320fa647e9119c98a102da432576cf231b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}