{
  "manageEntity": {
    "action": "Save",
    "entityId": "398115",
    "entityType": "Track",
    "nonce": "0xd921641f974fb11b1a384f82f6f626a48571059ec889db75c90795b7f7601a3b",
    "signature": "0xda50813c68db0ccdee5d21b4f48725f8e8d30e830df44979a066eddaf27ace1c41a32abc1c62331fe0ec9c4ce716c51b6292219940e150718fc7e3b2febd76121b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}