dragonfly-multisig

A zero-knowledge multi-signature wallet that preserves owner privacy while maintaining the security guarantees of traditional multisig wallets. The wallet uses zk-SNARKs (Groth16) to prove ownership without revealing the actual owners' addresses.

This implementation combines:

• Zero-knowledge proofs for owner privacy

• Multi-signature functionality for enhanced security

• On-chain transaction management

• Replay attack prevention through attestations

• Privacy: Owner addresses are never revealed on-chain

• Security: Requires M-of-N signatures to execute transactions

• Flexibility: Supports arbitrary ETH transfers and contract interactions

• Replay Protection: Uses unique attestations for each signature

Overview

This implementation combines:

• Zero-knowledge proofs for owner privacy
• Multi-signature functionality for enhanced security
• On-chain transaction management
• Replay attack prevention through attestations

Key Features

• Privacy: Owner addresses are never revealed on-chain
• Security: Requires M-of-N signatures to execute transactions
• Flexibility: Supports arbitrary ETH transfers and contract interactions
• Replay Protection: Uses unique attestations for each signature

Technical Architecture

Smart Contracts

1. MultiSigWallet.sol

   • Manages transaction lifecycle
   • Stores hashed owner identities
   • Verifies zk-proofs for ownership
   • Handles transaction execution

2. Groth16Verifier.sol

   • Verifies zero-knowledge proofs
   • Integrated with the main wallet contract

Circuits

The zero-knowledge circuit (multisig.circom) proves:

• Ownership: The prover knows a private key corresponding to one of the registered owner hashes
• Message Attestation: The prover has signed the transaction data