{
  "manageEntity": {
    "action": "Save",
    "entityId": "1266871360",
    "entityType": "Track",
    "nonce": "0x4befb05fd9d168913468bded9b4c7004fd6726fb74a7934101384b3148d01681",
    "signature": "0xc9afd5fc75153b062e7dbd2cee8ea20e697c128b04fd5d03b36f2572b5e7dc9f64174db51a988e8f11119fcc00c8f117ec6f1bff2a9babe1597b69778594a90e1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}