{
  "manageEntity": {
    "action": "Save",
    "entityId": "1513947444",
    "entityType": "Track",
    "nonce": "0x8a93feba7eda37c37414e14017c33dbed4e6ff70ae5b3be32d78d661095eb673",
    "signature": "0x2515d42a279e63a6f5fde30ca3e98ac8dc1bda59c2c858c78afe8d1ad79575d83952c1fd9fc6c33dda627ad9a3d36a7ba16e33d5eda3b6fc214a6f219f9fd6871c",
    "signer": "0x2B28feb1CA15953a5a910C4E741698a24e8b3FE9",
    "userId": "887020893"
  }
}