{
  "manageEntity": {
    "action": "Save",
    "entityId": "919433",
    "entityType": "Track",
    "nonce": "0x1fc139f97ce6c7cefe8cc8b3fce3cf1a00319b1f8a352cfb0f1044b3a1a6e0ae",
    "signature": "0xf76bd2f02483284d32618367e90c870ec64febc4ac5a16a4e68f55db75c973822c102547bd68e3a4eac3dad58fabe88a58ae994acd3a08f6a519fa6e83949be91c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}