{
  "manageEntity": {
    "action": "Save",
    "entityId": "139650853",
    "entityType": "Track",
    "nonce": "0xc24a6935288f01c641360129c7fa25850f66d57ca7cb574ffe50540c7a1ac68f",
    "signature": "0xcaf9e72d3501d3d0417af26f4602bda79a14dfa263f24b6fe34f4a8de92ca722410a0cdfc25cadbd8a8c7988dc200eeb1f78bf9ea26941de6caa15f0a330adce1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}