{
  "manageEntity": {
    "action": "Save",
    "entityId": "299841646",
    "entityType": "Track",
    "nonce": "1786484914571743969",
    "signature": "0xa459bcdbd41ed6026658da83910470a5517bca1bef84d648c017778b8a7ce3a33027b9e2d4cd015303c5167a5ad772fca7ceb66ef94dacc6dbe39c67b43945a51b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}