We have a bit different verification system to what you're talking about. We do not generate hashes before each game. If you've done at least 5 bets, you could do the
randomization to see the previous client seed. This client seed could be used to verify previous bets you've played. Actual client seed is always hidden.
Seems a bit akward here if you dont display on the hashes before the game play. Displaying the seed
after bet would be pointless because there is a chance for the house to cheat
Lets put on the simple example here
Bet #1 player choose 1 result 1 player win, house could cheat by displaying 2 because the hashes is not shown before the game
bet #2 player choose 1 result 2 player lose
bet #3 player choose 1 result 3 player lose
bet #4 player choose 1 result 4 player lose
bet #5 player choose 1 result 5 player lose
After bet #5 the seed shown could be anything to match the result from bet #1 so that player could not really verify the result of it as the house could show whatever the seed is to match the cheated result
P.S : I may be wrong though