'csNext' is not returned, it is a parameter in the request 
They generate that clientseed randomly in the browser with the RNG you provided.. so that is fine. The problem is that they are sending it to the server already before getting the next serverseed hash (which is my first point in my last post in that previous thread 
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They generate that clientseed randomly in the browser with the RNG you provided.. so that is fine. The problem is that they are sending it to the server already before getting the next serverseed hash (which is my first point in my last post in that previous thread )The reason we do this is that it allows us to verify client seed integrity against the user profile. The next server seed is not sent to Moneypot, so they don't know it.
However, for the client seed this probably doesn't matter, so it's probably best to disable this feature.