{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557189830",
    "entityType": "Track",
    "nonce": "0x1792ce5883c9a48128f21b710e2de91e0bd7fc76200cb4523a5252acd6c19eda",
    "signature": "0x7aebad95c46154b79a9c2bd22cbbc539fea92b656ede774317bdb15820d9e7393c6e37aa8053b6861a9274664a66bef42e6d2f6adbfb9255321212ed3390789e1b",
    "signer": "0xDfAC0702040EaBd2d42e773014D4b014C0747D9c",
    "userId": "707937"
  }
}