{
  "manageEntity": {
    "action": "Save",
    "entityId": "328638",
    "entityType": "Track",
    "nonce": "0x17b8861de7c4455605b16aa9e2385081316dba4d9a4da61809fb17f2a44a48aa",
    "signature": "0x15bb56365720363c3122615162b5b7dc77a81f3beff24567c903e6de9564162c59f4d038062817731fd4c9d3d4c379790ffd5df2a83a36378e776fcb8af10bfd1c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}