{
  "manageEntity": {
    "action": "Save",
    "entityId": "1641149296",
    "entityType": "Track",
    "nonce": "0x4971756b08c9f9106ff8678837b193ac44e6bfe8511e4e85f8f4522720ab56a6",
    "signature": "0x6585f1aee484091d2547a8b59206548a8cf5e8e9cfcb5f880ad88dfe01b91524133546bb714747ec646354735d6474c9546ecd8a718cbec5e023e2159e8244121c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}