Verifying that a chess move is legal takes 20 different rule checks. On-chain, that's millions of gas. Off-chain in a circuit with a zk-SNARK proof, it's 250k gas to verify. Same security, fraction of the cost. This is the unlock that's quietly reshaping web3.
We're building a Groth16 zk-SNARK verifier in pure Solidity, no external dependencies, with a complete application layer that uses it. The example: a private chess game where moves are proven legal without revealing what the move was. The pattern: any computation expressible as constraints can move off-chain.
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