ok maybe you know ... who invented this term? : "provably fair" :\
You avoided addressing any of my points, as expected, but that's a reasonable question.
I don't know the answer.
The first time I came across the concept of provable fairness was on bitjack21:
As of 8/9/11 I have enabled the "crypto-proof" system on the website. This system is a mathematical PROOF that every hand you play at http://bitjack21.com is 100% completely honest. (Technical details at http://bitjack21.com/cryptoproof )
;;;;;;;;;;;;;;no you don't have any idea yet fools like you throw this term around like its some kind of bitcoin gospel!!! rotff!!! 
A gospel is an account describing the life, death, and resurrection of Jesus of Nazareth. Whether you believe the account is a matter of faith. It's impossible to prove the content true or false.
That's nothing like provable fairness, which is a mathematical feature of a site. I guess you could argue that it requires faith to believe that it's almost impossible to find sha-256 collisions, but that's a stretch.
Basically people "throw around" provable fairness as a useful concept because it works, not because it's a story they like.
Dead links? nice one..haha
*fwiw*: this actually sounds legit and "provable" because you see the hash before the hand! .. this is not how it works in todays sites i've seen! >>
https://bitcointalk.org/index.php?topic=33766.msg436745#msg436745