Epic: SIP Ethereum Contract (Solidity)

On-chain privacy contract for Ethereum using Solidity.

Overview

This epic covers the core Solidity contract implementation for same-chain privacy on Ethereum and L2s.

Technology Stack

• Solidity → On-chain smart contract
• Pedersen Commitments → Hidden amounts (EVM precompiles)
• Secp256k1 Stealth Addresses → EIP-5564 compatible
• ZK Proof Verification → On-chain Noir verifier
• Viewing Keys → Compliance/audit disclosure

How It Works

1. User creates shielded transfer (SDK generates commitment + proof)
2. Solidity contract verifies ZK proof on-chain
3. Funds transfer with hidden amount (only commitment visible)
4. Recipient scans for stealth addresses, claims with viewing key

Sub-Issues

• Solidity contract: shieldedTransfer function
• Solidity contract: claimTransfer function
• On-chain Pedersen commitment verification (EVM)
• On-chain ZK proof verifier (Noir→EVM)
• EIP-5564 stealth address on-chain implementation
• Solidity contract audit preparation

Success Metrics

• Contract deployed to Sepolia testnet
• 3+ L2 chains supported
• Gas benchmarks under 200K per shielded transfer
• Security audit preparation complete

Related

• Roadmap: M18 (Phase 4)
• L2 Support: Polygon, Arbitrum, Base, Optimism