How to Manually Verify Your Crypto Dice Rolls

Updated: 27 October 2026

Verification shows that a roll was not changed after you placed the bet. It does not prove that you will win, and it does not change the house edge. This guide shows how to check a Wolfbet dice roll by hand, step by step, using the same method Wolfbet publishes on its Provably Fair page.

What you need

• The server seed, revealed after the session ends. You get it from the Session tab.
• The server seed hash you saw before you started betting.
• Your client seed and the nonce of the bet you want to check.
• The roll result shown in your bet history.

Step 1: check the server seed

Hash the revealed server seed with SHA-256 and compare the result with the hash you saw before betting. If they match, the seed did not change after you started playing. If they do not match, contact support and keep your records.

Step 2: combine the values with HMAC-SHA256

Wolfbet uses HMAC-SHA256 with these inputs:

• Key: the server seed.
• Message: the client seed, an underscore, and the nonce. For example, with client seed abc and nonce 468, the message is abc_468.

The output is a 64-character hexadecimal string.

Step 3: read five characters at a time

1. Take the first five hex characters and convert them to a decimal number. The result is between 0 and 1,048,575.
2. If the number is 1,000,000 or higher, take the next five characters (skipping the ones you already used) and convert those instead.
3. Repeat until you get a number below 1,000,000.
4. In the extremely unlikely case that every chunk is too high, Wolfbet uses 99.99.

Step 4: turn the number into a roll

Take the number modulo 10,000, then divide by 100. The result is a roll from 0.00 to 99.99.

The same logic in JavaScript, as Wolfbet publishes it:

javascript

const verify = (server_seed, client_seed, nonce) => {
  const hash = CryptoJS.HmacSHA256(server_seed, `${client_seed}_${nonce}`).toString();
  let index = 0;
  let lucky = parseInt(hash.substr(index, 5), 16);
  while (lucky >= 1000000) {
    lucky = parseInt(hash.substr(index, 5), 16);
    index += 5;
  }
  return (lucky % 10000 / 100).toFixed(2);
};

Two worked examples

Example 1: the first chunk is valid. The HMAC output begins with 9e8f7. That is 649,463 in decimal, below 1,000,000, so no retry is needed. 649,463 modulo 10,000 is 9,463. Divide by 100 and you get 94.63.

Example 2: the first chunk is too high. The output begins with fffff00a1b. The first chunk, fffff, is 1,048,575, which is too high. The next chunk, 00a1b, is 2,587, which is valid. 2,587 divided by 100 gives 25.87.

Step 5: compare

Compare your result with the roll in your bet history. Round to two decimals before you compare. If they match, the bet was calculated as Wolfbet documents. If they do not match, check the common mistakes below before you contact support.

Common mistakes

• Using plain SHA-256 instead of HMAC-SHA256 for the roll calculation. Plain SHA-256 is only for checking the seed hash in Step 1.
• Swapping the key and the message. The server seed is the key. The client seed and nonce form the message.
• Using the wrong separator. Wolfbet joins the client seed and nonce with an underscore.
• Using the wrong nonce. Check that you are using the nonce of the bet you want to verify, not the current one.
• Skipping the retry rule. If the first five characters give a number of 1,000,000 or more, you must move on to the next five.
• Rounding too early. Keep the full number until the last division.

Verify on Wolfbet without a calculator

Wolfbet’s own Verification tab runs this calculation for you. Open the Provably Fair page, choose the Verification tab, select Dice, and enter the client seed, the nonce and the server seed. The slider shows the result. Compare it with your bet history.

Keep records

Save the seeds, hashes, calculations and screenshots for any result that looks wrong. Note the time and the bet ID.

When to verify

Check a few bets early on, especially with a new platform. After that, spot-check after large wins or losses.

For how fairness fits into the bigger picture, read provably fair gambling: how Wolfbet’s system works. For how verification connects to choosing a system, see dice strategy bitcoin: what actually works.

Conclusion

Manual verification is a practical way to confirm that rolls were not changed. It proves fairness, not profitability.

Knowing a roll is fair is half the job. See which betting systems actually work.

Gambling involves financial risk. Only play with money you can afford to lose. 18+.