{
  "manageEntity": {
    "action": "Save",
    "entityId": "1225216062",
    "entityType": "Track",
    "nonce": "1789915612421368318",
    "signature": "0x88c089c4a6c2012b88777a6bc5c19ffff1a220193961404763e5ed88dda36709345c54f83ad8bc0c0fd46e0da19a6c25177064423fe68defe4da7776321b9c931b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}