Where is this format coming from?

{"username":"_","hex":"134743ca8ad0203b3657c20a6869e64f160ce48ae6388dc1f5ca67f346019ee7"}

It should be something like this:

{

"names": {

"_": "134743ca8ad0203b3657c20a6869e64f160ce48ae6388dc1f5ca67f346019ee7"

}

}