get websoket data from website with c++ as proof of concept.

I need a javascript expert to analyze https://rollbit.com/ in browser developer mode and discover how "validation_id" and a checksum are calculated locally. They are used in every post,get, requests. And a write a simple test function that requests and gets websocket data in c++.
The c++ project can be a simple console one and should only display the prices received from the websocket.