Minefield uses a commit-reveal scheme with client nonces to guarantee fairness. Neither the server nor the player can manipulate the outcome.

How It Works

1. Server commits: The server generates a random 32-byte seed and commits SHA-256(seed) onchain. The seed itself remains hidden.
2. **Player picks with nonce:**The player picks a tile and submits a random 32-byte client_nonce. This nonce is stored onchain.
3. Server reveals: The server reveals the raw seed onchain. The program verifies:

SHA-256(revealed_seed) == stored_commitment

1. Mine placement: Mine position is determined using:

keccak256(server_seed || client_nonce)

1. Repeat per row: Steps 1–4 repeat for every row. Each row has its own:
   • server seed
   • commitment
   • client nonce

Why This Is Fair

• The server commits its seed before the player picks.
• The player submits a random nonce after the commit.
• Mine placement depends on both values:

keccak256(server_seed || client_nonce)

Neither side can control the outcome alone.

Post-Game Verification

After a game ends, players can verify every row.

• All server seeds, client nonces, and picks are stored onchain in the Game account.
• Run: