Chih-Cheng Liang | Tornado Cash with Poseidon Hash

Sat, Oct 2, 2021, 12:00 AM

Speaker intro Chih-Cheng Liang builds zero-knowledge proof applications on Ethereum. EF's Privacy and Scaling Explorations Team. Talk description "Tornado Cash with Poseidon Hash" https://github.com/ChihChengLiang/poseidon-tornado Tornado Cash is a non-custodial transaction mixer on Ethereum. A user deposit funds then withdraw them using a zksnark proof to hide information and break the link between depositing and withdrawing addresses. The core logic of the Tornado Cash is implemented in short line of codes. The circuit part has less than 200 lines. In this talk we present a variant of Tornado Cash that’s proposed in one of the original project’s audit report. It features even more simplified circuit logic and nullifier hash construction. Also the project is built on ethers.js, hardhat, and newer versions of Solidity and Circom, so that the codebase is quickly reproducible in the newer development environments. The goal of this project is to help onboard new developers to learn how Zkapp works.