Objectives

Analyze the existing Tornado Cash protocol architecture to understand its core components
Research Solana's programming model and Rust language requirements
Identify Pinocchio zero-knowledge proof system integration points for Solana
Design a Solana program architecture that maintains the privacy features of Tornado Cash
Implement the Merkle tree functionality in Rust for Solana
Port the deposit and withdrawal logic to Solana's account model
Implement zero-knowledge proof verification using Pinocchio on Solana
Optimize the Solana program for compute unit (CU) efficiency
Develop comprehensive test suite with 100% coverage
Create deployment scripts and documentation for the Solana implementation
Implement security measures to prevent common vulnerabilities in Solana programs
Benchmark performance and optimize critical paths for CU usage

Update development environment

cargo add solana-program spl-token borsh pinocchio-rs --features pinocchio-rs/solana
cargo add solana-sdk --features program
cargo add thiserror bytemuck arrayref
cargo add solana-program-test --dev

Cargo.toml

src/lib.rs

src/error.rs

Define custom error types for the Tornado program
Implement error conversion traits for Solana program errors
Add error codes for various failure scenarios like invalid proofs, double spends, etc.

src/processor.rs

src/instruction.rs

src/state.rs

src/merkle_tree.rs

src/hasher.rs

src/verifier.rs

src/utils.rs

src/constants.rs

circuits/withdraw.rs

circuits/merkle_tree.rs

tests/integration.rs

client/main.rs

client/utils.rs

README.md

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