SolMPC-Node: Multi-Party Computation Validator for Solana

Overview

SolMPC-Node is a distributed validator system that uses Multi-Party Computation (MPC) for threshold signing on Solana. Validators jointly generate keys and sign transactions without any single party holding the complete private key.

Current Implementation

• MPC Threshold Signing: 2-of-3 EdDSA key generation and transaction signing
• Ballot Processing: Demo voting system with vote tallying and result submission
• VRF Validator Selection: Verifiable random function for leader election
• Solana Integration: Creates and submits real transactions to Solana devnet

Quick Start

# Run 3 validators in tmux
./cmd/run_validators.sh

# Or run single validator
cd cmd && go run *.go 1

Architecture

SolMPC-Node/
├── cmd/                    # Validator entrypoint and CLI
├── internal/
│   ├── mpc/                # MPC threshold signing (EdDSA)
│   ├── exchange/           # File-based message transport
│   └── vrf/                # VRF leader selection
└── data/validators.csv     # Validator configuration

Issues to Fix

🔧 Transport Layer

• Current: File-based message exchange between validators
• Issue: Not suitable for production, introduces delays and race conditions
• Fix Needed: Implement proper P2P networking (libp2p/gRPC)

🏗️ Solana Program Integration

• Current: Using system program for demo transactions
• Issue: No actual voting program deployed on-chain
• Fix Needed: Deploy custom Solana program for vote storage and verification

⚡ Performance & Scalability

• Current: 2-of-3 threshold with file I/O bottlenecks
• Issue: Doesn't scale beyond demo, slow consensus
• Fix Needed: Optimize MPC rounds, async message handling, configurable thresholds

🔐 Production Security

• Current: Fixed test recipients, basic key management
• Issue: Not production-ready for real assets
• Fix Needed: Proper key rotation, hardware security modules, audit trails

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License

MIT