Comprehensive Smart Contract Security Audits

Overview

Zellic provides industry-leading smart contract security audits across all major blockchain ecosystems. Their flagship audit service combines an attacker mindset with thorough vulnerability research, employing multiple security engineers per engagement with dedicated Engagement Managers for quality control. In 2024, Zellic conducted 241 security reviews, identifying 193 critical vulnerabilities and 266 high-impact findings, with 59% of assessments revealing critical or high-severity issues that could have resulted in significant financial losses.

Multi-Chain Expertise

Zellic's smart contract auditing spans comprehensive coverage across:

EVM Ecosystems: Ethereum and EVM-compatible chains with expertise in Solidity, Vyper, and Huff (low-level EVM language)

Solana: Full-stack security from core protocol to Solana programs, including Anchor framework security, PDA validation, CPI security, and runtime analysis. Notable work includes discovering a critical inflationary bug in Solana's Zero-Knowledge confidential token transfer functionality.

Move-Based Chains: Specialized expertise in Aptos and Sui Move security, including bytecode verifier vulnerabilities, resource safety violations, and Move prover specification correctness. Zellic discovered a critical vulnerability in Move's bytecode verifier that put billions of dollars at risk.

Cosmos Ecosystem: Application-specific blockchain security, Cosmos SDK modules, IBC protocol security, CosmWasm smart contracts, and non-determinism issues that can lead to consensus failure. Includes discovery of critical buffer overflow in Cosmos SDK's Sign Mode Textual function.

Layer 2 Solutions: StarkNet, Scroll, Mantle, and other rollup implementations with focus on consensus mechanisms, state transition functions, and chain-specific attack vectors.

Specialized Security Domains

DeFi Protocols: Comprehensive audits for AMMs, lending markets, liquid staking derivatives, oracles, stablecoins, vault strategies, and yield aggregators. Clients include SushiSwap, Aave, Pyth, and other major DeFi protocols managing billions in TVL.

Cross-Chain Infrastructure: Leading expertise in bridge protocols, message passing systems, relay security, and multi-bridge aggregation. Over 12+ audits for LayerZero alone, with identification of severe business logic bugs in Stargate that could have permanently locked user funds.

Wallet Security: Applied cryptography reviews for non-custodial wallets, ERC4337 Account Abstraction, MPC wallets, Shamir's Secret Sharing implementations, and secure enclave wallet solutions. Secured major wallets including Aptos IdentityConnect, Pontem, and Privy.

Secure Enclaves & TEEs: Expert security assessments for Trusted Execution Environments, hardware wallets, secure elements, and firmware security. Notable engagements include Solana Mobile's secure enclave architecture and Cosmos Ledger integration.

Audit Process

Zellic's comprehensive methodology includes:

• Attack surface enumeration and threat modeling
• Static analysis using proprietary tools
• Manual code review by multiple security engineers
• Dynamic analysis and edge case testing
• Daily client communication throughout review process
• Detailed vulnerability reports with remediation guidance
• Pre-deployment security sign-off

Track Record

Zellic has secured some of the largest protocols in Web3 including LayerZero, Wormhole, SushiSwap, StarkWare, PancakeSwap, Wintermute, Pyth, Scroll, Biconomy, Ethena, Mantle, Solana Foundation, Aptos Labs, and Mysten Labs. Their discoveries include billion-dollar bugs in Move bytecode verifier, critical protocol-level vulnerabilities in major L1 chains, and severe business logic bugs in cross-chain infrastructure.