{
  "manageEntity": {
    "action": "Save",
    "entityId": "774845290",
    "entityType": "Track",
    "nonce": "1791037968967260336",
    "signature": "0xfc33c70205948dc154d0648e34731fd7c1a4a3741aa7bc793a8ea5b25027d1237287d8ab2bdaa7406211c84f6237dac46d957f28a73727ac1f30a89f09d26ff11b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}