The roulette "Next server hash" appears to be working fine for me, however the explanation may be a little unclear. The Roulette "SHA256(Next Server Seed)" should be equal to the hash of the next server seed that appears in the "Server Seed" box. Basically keep a copy of the hash you are given, compare it to the SHA256 hash of the next value to appear in the "Server Seed" box after playing a game.

For the Satoshi Slider verifier, that tool was made (and last updated) nearly a year ago, we have no control over any content on their website. Please follow the instructions in the proof tabs of our games for verification.