Let me answer your doubts. Players can compare the results of this round with the results of the last N rounds to confirm whether the dealer is cheating. Because we use continuously generated hashes to generate results.
For the specific principle, you can refer to:
https://top.game/help/provably-fairWell, this time i was wrong, if the result is based on the previous game then you are using a good provably fair engine, i have seen people doing this kind of provably fair for games like crash in the past.
I got confused because i only saw the seed and salt, and for a moment i thought you were taking random salts for each round, casinos like freebitco do it, and i don't feel that's a good provably fair method, but you are implementing a good one, so, good luck with your project and thanks for offering a fair engine to the community, we need more of those.