I think I get how this works. Could be wrong, please correct me if I made a mistake.
So first you click the toggle verification mode button, and you get the server seed and user seed, and you use the formula SHA512(ServerSeed + "|" + UserSeed) to get the result hash.
With the example above, the result hash is 7cb6c11507fbbb446f27f0918d6dbf1285b306d9ca9af8dc97592c18be95a236a1b6d3c164ecc73
693fe972e54c2ba67af87a5c91eca576c9155b3de1ddffc5d
Then you get the first 4 characters (7cb6) and convert hex into binary. Here is a converter you can use:
http://www.binaryhexconverter.com/hex-to-binary-converter or you can use a different site/do it manually. Converting it gives me this:
The binary value is 0111 1100 1011 0110. The drop should move left for a 0, and right for a 1. I believe you keep doing this until you get to the result.
The bet example used is
this bet.Alternatively, you can trust the site to give you correct javascript and use their verifier.