{
  "manageEntity": {
    "action": "Save",
    "entityId": "728371",
    "entityType": "Track",
    "nonce": "0xd8892b22a7ac5288d46fdd607f7c687e401c2a6b5180ffa554e1c70aa70e6ada",
    "signature": "0x6ea2fed34affba16e16e367cd9504d0d44969a6c97a21fdc8fa8308463afe7a4771e25147a6c4b02a740e80ab28a8d6bbf99161a3f67cb0a863d2283e5e2c1c71c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}