In our Keno game, we guarantee fairness and randomness for each round by generating winning numbers in a secure and transparent way. Each round starts with numbers 1 through 40, which are shuffled using a unique formula that combines three key elements: a hidden server seed, a player-provided client seed, and a nonce (a unique counter that increments with each game). This combination ensures unpredictability in every game, as the shuffle order is determined by these inputs, preventing anyone from knowing the outcome in advance.After shuffling, we draw 10 unique winning numbers for each round. At the end of the game, we reveal our server seed so you can verify the results yourself, ensuring that each game is honest and completely fair.<pre data-language="plain">//javascript
let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40];

const seedBuffer = crypto.createHash('sha256').update(${serverSeed}:${clientSeed}:${nonce}).digest();
const seededRandom = seededRandomGenerator(seedBuffer);
for (let i = numbers.length - 1; i &gt; 0; i--) {
 const j = Math.floor(seededRandom() * (i + 1));
 [numbers[i], numbers[j]] = [numbers[j], numbers[i]];
}
// Select 10 unique random indices after shuffling
const winningNumbers = [];
const selectedIndices = new Set();
while (winningNumbers.length &lt; 10) {
 const index = Math.floor(seededRandom() * 40);
 if (!selectedIndices.has(index)) {
 selectedIndices.add(index);
 winningNumbers.push(numbers[index]);
 }
}
return winningNumbers;
}
function seededRandomGenerator(seedBuffer) {
 let counter = 0;
 return function () {
 const hash = crypto
 .createHmac('sha256', seedBuffer)
 .update(counter.toString())
 .digest();
<pre><code>counter++;

// Convert the first 6 bytes of the hash to a number between 0 and 1
const randomNumber = hash.readUIntBE(0, 6) / 0x1000000000000;
return randomNumber;
</code></pre>
 };
}
</pre>The game uses a seeded Fisher-Yates Shuffle to determine the order of the numbers. This shuffle algorithm is highly efficient and provides an equal chance for each number to appear in each position. Here’s how it works: after initializing the numbers array (which includes numbers from 1 to 40), the game shuffles the array using the seededRandom function, which is powered by a SHA-256 hash of the combined seed. This method ensures that the shuffle pattern is consistent and verifiable.For example, if we have numbers [1, 2, ..., 40] initially, the Fisher-Yates algorithm will use the seededRandom function to swap each number with another random position in the array. This process, driven by the secure seed, creates a unique order each round that cannot be tampered with.After the shuffle is complete, we select the first 10 unique numbers as the winning numbers. Since each number has an equal chance of being selected, players can trust that the game outcomes are unbiased and fair.The SHA-256 hashing process for random number generation ensures security and transparency. By revealing the server seed post-game, players can confirm that their game outcomes were generated honestly, adding confidence to every Keno round.

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