Smart Contract & Protocol Security Audits

Three Sigma provides comprehensive smart contract and protocol security audits, covering the full spectrum of Web3 languages and ecosystems to ensure code is secure, optimized, and mainnet-ready.

Service Overview

Founded by cybersecurity engineers with an attacker-first mindset, Three Sigma has completed over 150 audits, protected more than $10 billion in client assets, and uncovered 300+ critical and high-severity issues. Each audit combines automated static analysis with deep manual code review, custom fuzzing, invariant testing, and proof-of-concept exploit development.

Language and Chain Coverage

• Solidity (EVM) — Ethereum, Arbitrum, Polygon, Base, and Optimism; proxy upgrade patterns, reentrancy, flash loan attacks, access control, and delegate call misuse
• Rust (Solana, NEAR) — CPI flows, account validation, signer checks, PDA security, serialization risks, and Solana-specific attack vectors
• Move (Sui, Aptos) — Resource ownership, capability-based access control, entry function validation, and coin/token flow security
• Bitcoin/Script — Bitcoin Script and Tapscript correctness, multisig configuration, Lightning Network channel security, BitVM logic, and sidechain bridge security

Specialized Audit Scopes

• Bridge & Cross-Chain Audits — Lock-and-mint logic, message passing, relayer infrastructure, oracle dependencies, and replay attack protections
• L1/L2 Protocol Audits — Consensus correctness, validator economics, sequencer/prover logic, data availability, and upgrade governance
• DAO & Governance Audits — Governor and Timelock contracts, voting power delegation, quorum parameters, treasury management, and flash loan voting vectors
• dApp Frontend Audits — XSS/CSRF, wallet connection handling, backend API security, RPC endpoint exposure, and transaction signing flows

Audit Methodology

1. Scoping and planning — full scope definition covering contract modules and dependencies
2. Architecture review — attack surface mapping and systemic risk assessment
3. Manual code review — line-by-line inspection for vulnerabilities, inefficiencies, and best-practice deviations
4. Testing — static analysis, property-based fuzzing, invariant testing, and mainnet-fork simulations
5. Reporting — severity-ranked findings with minimal-change fix suggestions and PoC exploits
6. Verification — re-audit phase confirming all resolved issues are correctly mitigated

Deliverables

Annotated findings report with severity rankings, reproducible PoCs, and actionable remediation steps. Post-audit verification and ongoing support for upgrades and emergency patches. Reports are suitable for investors, exchange listing teams, partners, and compliance teams.