{
  "manageEntity": {
    "action": "Save",
    "entityId": "203674550",
    "entityType": "Track",
    "nonce": "1792341694614363436",
    "signature": "0x9be6e98ff4dc7c7144435137058ed7eb0626365beb1682761d8c59e5ccf04f3c06b83369a250c876ea87b70c983abf743232e2724f92a0e88383481637be76621c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}