{
  "manageEntity": {
    "action": "Save",
    "entityId": "211459",
    "entityType": "Track",
    "nonce": "0x75bfa4279686decfe12bfe74b07235ed022dd434d76c2d09618c8845254faba0",
    "signature": "0x17035666581178f53270ed8a0420ea7887e47d54693b4b2835d9abfeeabd015820651947c2f9579154dc14a7ad6ae25a328acec3bc68170397ded07b244596151b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}