{
  "manageEntity": {
    "action": "Save",
    "entityId": "1617181173",
    "entityType": "Track",
    "nonce": "0x7fb29420ac1299f764f2cbe99dbdf8562ba2ab18dc6c6e1fd4db359ec7d2641b",
    "signature": "0x2312c586662313740639aa269895e3259cbbbd2d87eb9d9189773fe5760cecd5199e9851322944a4b25b620bbea9dccafcfcbfa3fca0e974d87b5df86f4f2ecf1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}