Their "provably fairness",
http://www.bitsplay.ga/proof/:
Proof - Provably Fair Info
All the games are provably fair. They use the transaction hash, daily server seed, game name and transaction message to verify.
(Transaction message fallback to "null", if not present)
We have made a PHP script to verify all results. For any other query, you can contact us.
function checkMyResult($tx, $seed, $gamename, $mess = "null") {
$hash = sha1($tx.$seed.$gamename.$mess);
$value = substr($hash, 0, 10);
$dice = round(hexdec($value)/42949672.95,2);
echo "{$hash} - {$dice}";
}
?>
Yesterday's Server Seed was: 9097f4705fc87b41b0aa65a94e331dec8ad8c37f
I implemented that function. If you are a player, try it here:
http://btpp.jampa.eu/check_bitsplay.ga.php