Services
Smart Contract Audit
A comprehensive security assessment of your smart contract and blockchain code to identify vulnerabilities and recommend ways to fix them.
- Audited projects
- 6,235+
- Security audit findings
- 93,767+
- Formally-verified projects
- 1,235+
- Formally-verified contracts
- 2,623+
Scope
Fast and accurate smart contract security audit
Our industry-leading audit methodology and tooling includes a review of your code’s logic, with a mathematical approach to ensure your program works as intended.
Accurate findings
Have your code reviewed by CertiK’s team of seasoned security experts, who have audited 1000’s of projects.Actionable insights
Receive rich reporting, covering findings and recommendations on how to remediate vulnerabilities.Unparalleled flexibility
Providing the most extensive coverage on languages and ecosystems, as well as faster onboarding options, depending on the project code size.
Overview
What is a smart contract audit?
A smart contract audit is an expert analysis of every line of code in a smart contract, which detects bugs and provides solutions. This is an essential process that ensures a blockchain project is as secure as possible.
While blockchain projects are open source, most people don’t have the skills to inspect smart contracts. Expert auditors help users make informed decisions by identifying, explaining, and remediating potential risks.
Web3 platforms and DeFi projects secure billions of dollars of value. This makes blockchain security critical to the survival and success of all projects. Advanced tools like formal verification take the auditing process a step further by providing mathematical guarantees about smart contract behavior.
We combine expert manual review of smart contract code with advanced AI and mathematical techniques to ensure contracts function as intended. Our industry-leading audit methodology, experience, and tooling combine a review of your code’s logic with a mathematical approach to ensure your program works as intended.
Method
Smart contract audit process
Source code submission
Scoping & quote
Security analysis
Remediation guidance
Final report delivery
How it works
How does a smart contract audit work?
Every smart contract audit involves a comprehensive manual review by our team of experienced security experts. Automated AI-powered review provides an additional layer of security. Formal verification is an optional further step that certifies smart contract behavior with respect to custom function specifications. This helps developers get a handle on the entire scope of their platform.
- Smart contractSource code and deployment scripts
- Expert review
- Specification
- OptionalAutomatic formal verification
- Security reportLists security vulnerabilities and certified/violated requirements
Deliverables
What’s in a smart contract audit report?
Audit reports are comprehensive, fully transparent records that detail all identified vulnerabilities. These are classified by severity from Critical to Informational. Suggested remediation from our team of smart contract security experts accompany each vulnerability.
Vulnerabilities that are addressed before launch are marked as resolved. Issues acknowledged but unresolved are accompanied by a description of their potential effects and the project team’s justification.
Projects that undergo a completed audit earn a spot on the Skynet Leaderboard (opens in a new tab). This gives the entire Web3 community a powerful demonstration of a project’s commitment to security.
Smart contract audit reports are freely available to the public. This is part of our commitment to transparency and an open-source Web3 world. An audit report is evidence that a project takes security seriously and prioritizes the safety of its users’ funds. Auditing helps Web3 projects secure their code and avoid costly errors.
Experience
Our experience
CertiK has audited thousands of Web3 projects and tens of thousands of lines of code written in all major smart contract programming languages. We bring expertise that can only be gained from years of experience with thousands of projects to each and every audit.
When it comes to security, only the best will do.
Languages
- Solidity
- Rust
- Move
- Vyper
- Python
- Go
- C/C++
- Haskell
Chains
- Ethereum
- BNB Chain
- Polygon
- Solana
- Avalanche
- Cardano
- Aptos
- Sui
- TON
- Cosmos
- Polkadot
- Algorand
- ICP
- Fantom
- EOS
- Terra
Why CertiK
Why choose CertiK?
Our team of security experts has conducted thousands of audits across all major blockchain protocols. CertiK is trusted as the recommended blockchain and smart contract auditor by top exchanges like Binance (opens in a new tab), OKEx (opens in a new tab), and Huobi.
We audit all components of Web3 platforms, from projects built on blockchains such as Ethereum (opens in a new tab), BNB Chain (opens in a new tab) and Polygon (opens in a new tab), as well as more than a dozen of these Layer 1 blockchains.
CertiK is a pioneer in the application of advanced Formal Verification techniques to smart contract audits. This process goes a step beyond manual review to provide mathematical guarantees about the functionality of smart contract platforms.
Our collaborative approach to smart contract auditing ensures that your project is ready for a secure launch as soon as possible. We know that time is of the essence, and our large team of auditors can handle any job, no matter how big or small.
Clients
Trusted by market leaders
“While traditional testing approaches merely attempt to detect vulnerabilities, CertiK’s formal verification provides mathematical proofs that Web3 projects are bug-free. This is one of the main reasons that convinced us to go with CertiK for our smart contract security audit.”
FAQ
Questions, answered
A smart contract is a self-executing program deployed on a blockchain that automatically enforces rules and executes transactions when predefined conditions are met. Unlike traditional contracts, smart contracts run exactly as coded without intermediaries, enabling decentralized applications (dApps), token transfers, DeFi protocols, and other Web3 services to operate transparently and autonomously.
A smart contract audit is a comprehensive security assessment of blockchain code conducted by expert auditors to identify vulnerabilities, logic errors, and security risks. The goal is to ensure that the contract functions as intended and to provide clear remediation guidance before deployment.
Smart contracts often secure billions of dollars in value and are immutable once deployed. Audits help prevent costly exploits, protect user funds, and demonstrate a project’s commitment to security and operational integrity.
CertiK combines expert manual code review, AI-powered analysis, and optional formal verification to evaluate contract logic, security controls, and overall functionality. This layered approach ensures thorough coverage of potential risks.
Audits can uncover reentrancy risks, access control flaws, arithmetic errors, improper token standard implementation, logic inconsistencies, and other security weaknesses that could lead to fund loss or unintended behavior.
Yes. Completed smart contract audit reports are publicly available, supporting transparency within the Web3 ecosystem and allowing users, exchanges, and investors to independently review a project’s security posture.
Formal verification is an optional advanced step that mathematically proves smart contract behavior against custom specifications. It goes beyond manual and automated review to provide strong guarantees about contract correctness within the defined scope.
With thousands of completed audits, tens of thousands of findings, and extensive experience across Web3 platforms, CertiK is trusted by major exchanges and industry leaders. Its combination of scale, technical rigor, and collaborative approach helps projects launch securely and efficiently.
Resources
Learn more from our resources
How a Global Payments Provider Assessed a Settlement Token Infrastructure With CertiKA global payments provider developed a token-based settlement platform to support digital-asset settlement in the European market. CertiK conducted an independent, multi-layer security assessment covering the in-scope applications, APIs, private-blockchain environment, and smart contract.
How a Global Bank Reviewed Smart Contracts Against Its Business Rules With CertiKA global bank operating in Hong Kong was developing smart-contract functionality to support digital asset operations within a controlled blockchain environment. The implementation combined token functionality with institution-controlled permissions, transaction restrictions, administrative actions, and upgrade mechanisms. The institution needed an assessment that examined the code in the context of its intended business rules and operating model, rather than applying generic assumptions about publicly accessible token systems.
Technical insightsTolk Security Explained: From FunC’s Engineering Pain Points to New Audit ConsiderationsThis article compares FunC and Tolk through code, explains how typed schemas, automatic serialization, and lazy loading change TON contract security, and identifies the risks developers and auditors still need to review.
Technical insightsHow to Prepare for a CCSS AuditInstitutional counterparties ask crypto businesses a hard question: how do you safeguard your private keys? A bank wants evidence before it opens an account. A fund wants it before it deposits assets. The CryptoCurrency Security Standard (CCSS) exists to answer that question with an audit instead of a claim. This guide explains what the standard covers, how certification works and how you prepare for it.
Policy pulseSOC 2 and ISO 27001 for Crypto CompaniesRead to learn about the requirements of SOC 2 and ISO 27001, how to choose between them, and how to get from your current state to a passed audit.
Company updatesIntroducing CertiK Hunt, The Invite-Only Security Platform for Web3 Projects and Top Security ResearchersCertiK Hunt is an invite-only platform connecting elite security researchers with web3 projects through bug bounty programs, audit competitions, and AI challenges.