Privacy in On-Chain Gaming

Traditional on-chain games face a fundamental privacy problem: all game state is publicly visible on the blockchain. This eliminates strategic gameplay, makes games predictable, and prevents classic game mechanics like hidden cards, secret moves, or private information.

Liars Proof solves this by enabling privacy-preserving on-chain games where players can:

• Keep their cards completely hidden from opponents
• Make verifiable claims about hidden information
• Prove statements without revealing underlying data
• Play strategically without information leakage

Zero-Knowledge Proofs for Gaming

The Challenge

How do you verify that a player has a specific card (e.g., "a Heart card with value ≥ 10") without revealing:

• Which exact card they have
• Their entire hand
• Any other private information

Our Solution

Using Zero-Knowledge Proofs, players can:

1. Commit to their hand privately (cryptographic hash)
2. Claim they fulfill conditions (e.g., "I have a Heart ≥ 10")
3. Prove their claim with a ZK proof that verifies:
   • The claim is true
   • The proof matches their committed hand
   • Without revealing the actual cards

Problems Solved:

• ✅ No Cheating: Cryptographic proofs prevent players from lying about their cards
• ✅ No Information Leakage: Opponents learn nothing beyond what you claim
• ✅ Verifiable Fairness: All game logic is on-chain and auditable
• ✅ Trustless: No need for trusted intermediaries or servers

Making On-Chain Games Practical

Before Liars Proof:

• ❌ All game state visible → No strategy possible
• ❌ No hidden information → Can't implement classic game mechanics

With Liars Proof:

• ✅ Private game state → Strategic gameplay possible
• ✅ Verifiable claims → Fair and secure with ZK
• ✅ Hidden information → Classic game mechanics work on-chain