I understand what you are saying
So I guess you now realize the site isn't provably fair. That's fine, it doesn't mean you're cheating -- it just means you're not provably fair.
but how can we show you the outcome of the hand before you place the bet.
Depends on the game, but most single player games are extremely easy to make provably fair. For instance in my 'heads' vs 'tails' game, to make it provably fair, the only thing I need to demonstrate is that I've predetermined an outcome. (Which I can do via hashing it along with a salt).
I have forwarded this to my coders to see if the provably fair can be updated in anyway.
It's super easy. For one, if you reveal the function you use to convert the clientSeed and seed to make the "final seed" (and commit to never changing it) it would appear to make some games (keno is the only one i looked at) provably fair, without compromising security at all (assuming your function was something well designed, like a cryptographic hash)
In the provably fair algorithm, ALL THE HANDS are shuffled and then they are shuffled once more using the client seed, once the hand is set.
This is exactly how the provably fair system works everywhere.
In Heads or Tails, the server will toss the coin, then it will hash+salt it and send it to the player, then the player will send a client seed to influence the coin, and then once all these are set, you will try to guess from HEADS OR TAILS. Of course you have 50% chances to win no matter what, so you might throw in a lucky guess and take my money if you accept my challenge.
Only after the gameplay ends, the server hashed string+salt influenced by the client seed will be compared with the player pick and the outcome will be decided and the salt will be revealed.