{
  "manageEntity": {
    "action": "Save",
    "entityId": "554536195",
    "entityType": "Track",
    "nonce": "0xe579eb1ebdc2bc27e93bc2e674f93136b61093037b24ae6aacd5a2d9bd3025c5",
    "signature": "0xe4a2d0bd90acf94ae5c6c7538345254b39a8c923c8b621f4110e46f3d5ab99533299bed5acf120e649a30cc217c34dea802db38bc830151bf47ccfbedff5ee3b1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}