Mines Verifier

How to verify a past Mines round in 3 steps

Popular crypto-casinos like Stake and BC.Game use a transparent, provably fair engine to generate their 5×5 Mines boards. You can easily pull the seeds of any past round from your bet history panel:

1. Server Seed: You will need the revealed server seed from a rotated seed pair. The active server seed is hashed and hidden to protect game security.
2. Client Seed: Your custom client seed used when placing that specific bet.
3. Nonce: The sequence number of the specific bet. Check the bet details in your casino profile to find this index.

The math: How the 5×5 board is randomized

I used to think casinos dynamically placed mines under whichever tile I clicked next. It felt like a setup.

However, the cryptographic proof is undeniable. The entire 25-tile board is randomized before your first click. Here is the algorithm:

1. Generating the HMAC outcome stream

The game combines the server seed, client seed, and nonce to run a standard HMAC-SHA256 hash. It uses this hash to derive a stream of 25 decimal floats between 0 and 1, ensuring a continuous supply of highly random numbers.

2. The Fisher-Yates shuffle

To randomize the positions of the mines without duplicates, the engine uses the **Fisher-Yates shuffle** algorithm. It starts with an ordered array representing the 25 tiles of the board (numbered 0 to 24, starting from the top-left to the bottom-right):

Board = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]

It shuffles this array from right to left (from index 24 down to 1). At each position i, it takes a float from the random stream, converts it to an index j between 0 and i:

j = floor(Float * (i + 1))
Swap Board[i] and Board[j]
  

This loop repeats 24 times. The first 3, 5, or 10 indices of the shuffled array (depending on your mine count setting) represent the exact positions of the mines.

A concrete mapping example:

If the first shuffled position maps to index 0, there is a mine at the top-left corner. If it maps to index 24, a mine sits in the bottom-right corner. The verifier replicates this process, revealing the exact coordinates of every hidden trap.

Strategy: Spotting anomalies

Before diving into advanced betting systems or risk adjustments, refer to our detailed Mines strategy guide and use our Mines Payout Matrix to model risk-reward ratios. Because the entire board is generated client-side from the seed triple, the casino has absolutely no control over where the mines are placed once the round begins.

• Verify early losses: Run audits on rounds where you lost on the very first or second selection. This will immediately show if the mine was actually pre-determined on that tile using our Universal Verifier.
• Check patterns: If you notice unusual clusters of mines (e.g., all mines in a straight line), verify the seed. In a truly random distribution, clusters and lines are expected over time, but their mathematical origin should match our Fisher-Yates results perfectly.

Frequently asked questions