I am sorry, it should be "rounded off" and not "rounded up". I shall correct this on the website. So any number below 0.5 will be rounded down to 0.

yup, the hotwallet has ~ 5 BTC (https://blockchain.info/address/1FreefoKihgKN1nCPD4FNxuRDwwWjoiVFi and I'll add more to it as needed

Are you asking whether the site pays out or not? If that's what you're asking then yes, it works. Here is a transaction that I received from them on the 22nd (mine is one of two addresses that received 0.00034735 BTC):

http://blockchain.info/tx/e692aad289251b6ba3e0eca1464d8b84d63638ba39428494cb49384bad21c5b9

{"9999" [{"Client": "Bb2X2OHbnoDdYxnJ", "Server": "OrGqUxpBuKFg", "nonce": "2014"}]
{"9999" [{"Client": "EROQqsMbdG6OeKp", "Server": "JDz5mY6qcmLi", "nonce": "3821"}]
{"9999" [{"Client": "R3ZVaapxrpNFtlWK", "Server": "nZELaYrdcaEu", "nonce": "4360"}]
{"9999" [{"Client": "sb73Ls2O9kYIkZOB", "Server": "NViuHQev34p", "nonce": "8525"}]
Tried 10000 times... 10k never found.

<?php
$fast = 1; // 1 = only print if 9999 or 10000 hits, 0 = prints a wall of numbers rolled
$tries = 10000; // will work at 20000 if $fast is set to 1, the wall can time out

$c=1;// Iteration count
do {
   $nonce = $c;
   $s_seed = server_string(); // 12 char server seed string
   $c_seed = client_string(); // 16 char client seed string
   $rnd = 429496.7295; // number provided to round by

   $nhash = hash_hmac('sha512',"$nonce:$s_seed:$nonce","$nonce:$c_seed:$nonce",false); // hash server and client seeds
   $result = hexdec(mb_substr($nhash, 0, 8 ))/$rnd; // get first 8 chars and hex to dec
   $result = ceil($result);

   if ($fast == 0) {
      switch (true) {
         case ($result == 10000)               : $txtcol = '#DBA901'; break;
         case is_between($result, 0, 9885)      : $txtcol = '#58D3F7'; break;
         case is_between($result, 9886, 9985)   : $txtcol = '#0000FF'; break;
         case is_between($result, 9986, 9993)   : $txtcol = '#DF01D7'; break;
         case is_between($result, 9994, 9997)   : $txtcol = '#000000'; break;
         case is_between($result, 9998, 9999)   : $txtcol = '#FE2E2E'; break;   
      }

      echo '<font color="', $txtcol, '">', str_pad($result, 5, 0, STR_PAD_LEFT), '</font> ';
      if ($c % 20 == 0) echo '<br />';
   } else {
      if (is_between($result, 9998, 9999)) { echo '{"9999" [{"Client": "', $c_seed, '", "Server": "', $s_seed, '", "nonce": "', $c, '"}]<br />'; }
      if ($result == 10000) { echo '{"10000" [{"Client": "', $c_seed, '", "Server": "', $s_seed, '", "nonce": "', $c, '"}]<br />'; $c=$tries; }
   }
   $c++;
} while ($c <= $tries);

function is_between($in, $min, $max) {
   return ($in >= $min && $in <= $max);
}
function make_rand($l,$h) {
   mt_srand(make_seed());
   return mt_rand($l,$h);
}
function make_seed() {
   list($usec,$sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 65536);
}
//convert from javascript example posted in forum
function client_string () {
   $charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
   $strlen = strlen($charSet);
   $ranStr = null;

   for ($i = 0; $i < 16; $i++)
   {
      mt_srand(make_seed());
      $ranStr[] = substr($charSet, mt_rand(0, strlen($charSet)), 1);
   }
   return implode($ranStr,'');
}
function server_string () {
   $charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
   $strlen = strlen($charSet);
   $ranStr = null;

   for ($i = 0; $i < 12; $i++)
   {
      mt_srand(make_seed());
      $ranStr[] = substr($charSet, mt_rand(0, strlen($charSet)), 1);
   }
   return implode($ranStr,'');
}
?>

{"9999" [{"Client": "yBJCif46twMVNqVF", "Server": "VBdykfilZuHA", "nonce": "5621"}]
{"9999" [{"Client": "SgpGWZN7WH9tDUPa", "Server": "0axDh7i3YIPk", "nonce": "6195"}]
{"9999" [{"Client": "WDSZNtGRNNYWtjCF", "Server": "dugXiwEuaKTb", "nonce": "6501"}]
{"10000" [{"Client": "HEfA59fGNw8ykriA", "Server": "t2BhGDCyaJG3", "nonce": "9791"}]

The javascript based roll verifier is now online at http://roll-verifier.s3-website-us-east-1.amazonaws.com/. I shall link it via the website shortly.

The javascript based roll verifier is now online at http://roll-verifier.s3-website-us-east-1.amazonaws.com/. I shall link it via the website shortly.

The javascript based roll verifier is now online at http://roll-verifier.s3-website-us-east-1.amazonaws.com/. I shall link it via the website shortly.

Those rolls include both free and multiply rolls, and multiply rolls are way more in number.

The client seeds are actually generated using javascript entirely on the client side. This is the part of the Javascript code that generates the client seed (can be found in the JS file http://static4.freebitco.in/min/main1403284658.js now but the name of the file changes when I make updates) :