{
  "manageEntity": {
    "action": "Save",
    "entityId": "539544090",
    "entityType": "Track",
    "nonce": "1785345040520597865",
    "signature": "0x812f37e4b7e27d802126403aa570f4f907ad622c8becc970b19d99546bec32a939079f6c3863d1425972bd19b9a26a5a8c30da955c76dd6ed3599a949e8bb2081b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}