zk-proofs

Topics in the source

• Zero-Knowledge Proofs
• Quick Start
• Key Concepts
• When to Use
• Step-by-Step
• Examples
• Best Practices
• Troubleshooting

Build zero-knowledge proof circuits with Circom and integrate them into dApps. ZK proofs let you prove statements without revealing inputs. Circom defines arithmetic circuits. Groth16 produces small, fast-to-verify proofs. Common uses: private transactions, identity verification, and scalability (zk-rollups). Privacy-preserving applications (private voting, identity) Blockchain scaling (zk-rollups, validiums) Verifiable computation (outsource computation with proof) Compliance (prove age, KYC, credit score without exposing data) 1. Author the circuit in Citcom: circom age-check.circom --r1cs --wasm --sym compiles to constraints, wasm, and symbols. 2. Generate the powers-of-tau ceremony artifact: snarkjs powersoftau new bn128 12 pot120000.ptau then snarkjs powersoftau prepare phase2. 3. Build proving + verification keys: snarkjs groth16 setup circuit.r1cs pot12final.ptau circuit.zkey. 4. Export the verification key and solidity verifier: snarkjs zkey export verificationkey and snarkjs zkey export solidityverifier. 5. Compute a witness offline with snarkjs wtns calculate then generate the proof with groth16 prove (timed for tester's threshold). 6. Verify in the dApp: call the on-chai

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