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Important updates will always be shared here.

1 February 2020

Bitsler Flash Roulette Provably Fair Seeding Event
We will soon release our new game Flash Roulette! To make this game provably fair, we announce our methods here. A chain of 1 million SHA512 hashes was generated (starting with a server secret.) The final hash is:

4c28a546da313d86a9ca42c59e833c179275ae0397893e92685ff414a17fe1ee963623a18c67317 1e0ee77204252c8fa0b7f629630861f53ea7b94a13f205e9b

Bitsler will go through the hashes (in reverse order) and use each hash to determine the roulette result. So the hash of our first game's hash is the same as our published final hash. To ensure we didn't pick a hash chain that has some advantage for us, we will use a future bitcoin block hash as "client seed" to generate the final roulette results. We will use the block hash of bitcoin block https://btc.com/block/668720 (around 8 AM GMT at Feb 2, 2020.)

The code to generate each roulette result is:

$hash = hash_hmac('sha512', $gameHash, $blockHash);
$config_multipliers = 
[ 
    [ 
        "150" => 3, 
        "100" => 8, 
        "50" => 5 
    ], 
    [ 
        "350" => 1, 
        "250" => 1, 
        "200" => 1, 
        "150" => 1, 
        "100" => 2, 
        "50" => 2, 
        "29" => 8 
    ], 
    [ 
        "350" => 1, 
        "250" => 1, 
        "200" => 1, 
        "150" => 1, 
        "100" => 2, 
        "50" => 2, 
        "29" => 8 
    ], 
    [ 
        "350" => 1, 
        "250" => 1, 
        "200" => 1, 
        "150" => 1, 
        "100" => 2, 
        "50" => 2, 
        "29" => 8 
    ] 
];    $offset = 0; 
do { 
    $number = substr($hash, $offset, 5); 
    $number = hexdec($number); 
    $offset += 5; 
} while ($number > 999999); 
$number = $number % 37;    $multipliers = []; 
for ($i = 0; $i < count($config_multipliers); $i++) { 
    do { 
        $multiNumber = substr($hash, $offset, 5); 
        $multiNumber = hexdec(($multiNumber)); 
        $offset += 5; 
    } while ($multiNumber > 999999 || isset($multipliers[$multiNumber % 37])); 
    $multiNumber = $multiNumber % 37; 
    // multiplier 
    $amount_number = hexdec(substr($hash, $offset, 1)); 
    $offset += 1; 
    // Loop multipliers 
    $multiplier_number = 0; 
    foreach ($config_multipliers[$i] as $multiplier => $range) { 
        $multiplier_number += $range; 
        // If the end of range is more than generated number, we use current multiplier 
        if ($multiplier_number > $amount_number) { 
            $multiplier = floatval($multiplier); 
            break; 
        } 
    }        // return 
    $multipliers[$multiNumber] = $multiplier; 
}   
print_r(["result" => $number, "multipliers" => $multipliers]);
!Important
This blog post will be shared on our social media channels and archived by several archive websites. Therefor we cannot edit the final hash (and therefor hash chain) nor the future bitcoin block number anymore. This makes our new game Flash Roulette completely provably fair.