The Full Guide to Strategic Fundraising with KOLs in the Crypto Space

Top 7 Smart Contract Audit Companies 2024

10 min read
Nov 4, 2023

More than ever before, security has been a major concern in the web3 space. The growth of decentralized applications, digital assets, and blockchain technologies has given rise to immense opportunities but has also exposed the vulnerabilities and risks of innovation. 

Over recent years, we've witnessed both prominent and smaller projects falling victim to hacking incidents, resulting in the loss of substantial funds. 

To navigate this complex landscape and safeguard your projects, the practice of smart contract auditing emerges as a crucial shield against potential threats.

In this blog post, you will find a complete guide to comprehending smart contract auditing, its importance, the dangers of ignoring it, and the top security audit firms in the industry that can collaborate with you to safeguard your Web3 project.

What is a Smart Contract?

At the heart of blockchain technology, smart contracts are self-executing agreements with the contract terms directly written into code. 

They automate, verify, and facilitate the execution of transactions without intermediaries. Smart contracts operate based on predetermined conditions, enabling trust and transparency in a decentralized environment.

Smart contract

What is a Smart Contract Auditing?

Smart contract auditing is a meticulous process that involves thoroughly reviewing the code of a smart contract for vulnerabilities, bugs, and security gaps. 

This careful analysis ensures that the code performs as intended and minimizes the risk of exploitation by malicious actors. 

Auditing firms identify potential weaknesses through rigorous testing and scrutiny and offer recommendations to strengthen the contract's robustness.

The process includes an in-depth examination of the code's structure, logic, and potential execution scenarios. By uncovering vulnerabilities, auditors prevent potential attacks and unauthorized access. Real-world examples, like The DAO hack and the Parity wallet bug, highlight the significance of auditing in preventing catastrophic incidents.

Dangers of not Auditing your Smart Contract 

The stakes in the Web3 arena are high, and the consequences of failing to conduct a thorough, smart contract audit can be disastrous. Here are the following dangers to take note:

1. Fund Loss: One of the most immediate and dire consequences of neglecting smart contract auditing is the risk of fund loss. Imagine pouring substantial resources into a project only to realize that a vulnerability in the smart contract code allows malicious actors to drain all the funds. 

This scenario isn't a mere hypothetical; it has happened multiple times in the history of Web3.

2. Unauthorized Access: Smart contracts often deal with sensitive information, from financial transactions to personal data. Neglecting proper auditing opens the door to unauthorized access to these contracts, potentially exposing user data and transaction details to malicious actors.

3. Exploitation and Manipulation: Vulnerabilities in smart contracts can be exploited to manipulate the intended functionality of the contract. Attackers can exploit these vulnerabilities to their advantage, bypassing security measures and executing unintended actions.

For example "reentrancy" attack on the DAO smart contract allowed the attacker to withdraw Ether before the contract could update its balance repeatedly. This loophole was exploited to drain a substantial amount of Ether from The DAO, exploiting the contract's logic.

4. Reputation Damage: A compromised smart contract has financial implications and can irreparably damage a project's reputation. Users and investors lose trust in projects that fail to prioritize security, potentially leading to a loss of credibility and a diminished user base.

5. Regulatory Scrutiny: The evolving regulatory landscape surrounding cryptocurrencies and blockchain technologies means that security breaches can attract regulatory scrutiny. Failing to ensure proper security measures can result in legal and regulatory consequences for projects.

6. Financial Liabilities: When security breaches occur due to neglected auditing, projects can face financial liabilities resulting from legal actions taken by affected parties. In addition to potential regulatory penalties, projects might be liable to compensate users for losses.

Examples of Hacked Smart Contract 

Here are examples of smart contracts that were exploited:

1. Yearn Finance Token Bug

A flaw in a token issued by the decentralized finance (DeFi) protocol Yearn Finance was exploited, resulting in substantial losses. The security firm PeckShield revealed that the exploit impacted Aave version 1, causing losses exceeding $11 million. The affected stablecoins included dai (DAI), tether (USDT), USD coin (USDC), Binance USD (BUSD), and tru USD (TUSD).

2. Wormhole Bridge Hack

The Wormhole Bridge encountered a hack in February 2022, leading to significant losses of approximately $326 million—the exploit leveraged errors in validating digital signatures, highlighting system security vulnerabilities.

3. Nomad Bridge Vulnerability

Exploiting an error in the Nomad smart contract code, multiple actors capitalized on a vulnerability that resulted in losses exceeding $190 million. The incident underscored the importance of robust smart contract updates and code maintenance.

4. Harmony Bridge Compromise

The Harmony Horizon cross-chain bridge was breached in June 2022 due to compromised private keys. This incident led to losses of $100 million, emphasizing the critical need for safeguarding private keys in blockchain systems.

How to Choose a Smart Contract Auditor Firm?

Choosing the correct smart contract auditing firm is a key decision that can significantly impact your project's security.

Consider the following factors:

  • Expertise: Look for firms with extensive experience auditing smart contracts within your project's niche.
  • Reputation: Research the firm's track record, read client testimonials, and gauge its industry reputation.
  • Methodology: Inquire about their auditing process, including code review, vulnerability assessment, and testing techniques.
  • Transparency: Choose a firm that offers clear and open communication throughout the auditing process.
  • Certifications: Opt for auditors with relevant certifications and memberships in cybersecurity organizations.
  • Communication: Effective communication is crucial throughout the auditing process. Choose a responsive and willing auditor to address your concerns and questions.

Top 7 Smart Contract Auditing Firm You Can Consult

At Lunar Strategy, we have helped you to research the most popular and reliable Smart Contract Auditing Companies you can consult.

Here is the list of those companies:


Emerging as an industry leader in blockchain cybersecurity and smart contract auditing, Hashlock brings unparalleled expertise through its adept team of security researchers and innovators. With a mission to enable secure Web3 adoption, Hashlock conducts comprehensive security audits, demonstrating exceptional prowess in uncovering vulnerabilities.

Its emphasis on community awareness (including through their industry news outlet and collaborative security processes with both enterprise and blockchain-native partners set Hashlock apart. Renowned for contribution to leading edge research and recognition from industry stakeholders, Hashlock secures web3's core values.

Services Offered

  • Manual smart contract analysis
  • Penetration testing
  • Blockchain cyber insurance through registered partners
  • Formal verification of smart contract proofs, thesis and threats
  • Deep experience with L1 infrastructure audits


2. Consensys

Co-founded by one of Ethereum's creators, Joe Lubin, ConsenSys, specializing in Ethereum-based smart contracts, stands apart. An integral part of ConsenSys, ConsenSys Diligence focuses solely on these smart contracts and has contributed to renowned web3 tools like Metamask and Truffle. 

Their services include exhaustive audits, ensuring the utmost security and reliability for Ethereum projects. Notable names such as Aave, OmiseGo, and Covantis trust ConsenSys's comprehensive approach, combining automated analysis tools and meticulous code review.

Services Offered

  • Thorough, smart contract audits tailored for Ethereum projects
  • Automated bug testing mechanisms
  • An integrated platform for the development and deployment of smart contracts


3. Hacken

Emerging from Ukraine in 2017, Hacken has swiftly grown into a leading blockchain security firm. Hacken's track record is impressive, with a workforce exceeding 100 professionals and over 1,000 clients encompassing crypto exchanges and decentralized applications. 

Their auditing, cybersecurity, and ethical hacking prowess has safeguarded over $10 billion in assets. Widely recognized, Hacken's certification sets the standard for Web 3.0 security and enjoys acknowledgment from respected platforms like Coingecko and Coinmarketcap.


4. Certik 

A prominent figure in smart contract auditing, Certik's origins trace back to 2018, established by esteemed professors from Yale and Columbia Universities. Their extensive audit portfolio, encompassing 3,500 projects, underscores their significance in the industry. 

Notable platforms such as Binance, OKEx, and Polygon rely on Certik to secure over $300 billion of assets. Certik's thoroughness sets it apart, offering audits and invaluable recommendations to address vulnerabilities.

5. OpenZeppelin

OpenZeppelin, founded in 2015 by Ethereum core developers, is a renowned open-source framework for creating secure smart contracts. Major companies like Samsung, Dell, and Microsoft utilize it. 

The framework offers comprehensive security audits conducted by experienced auditors who analyze smart contracts, system architecture, and codebase for potential vulnerabilities. The audit process results in a detailed report outlining identified issues. 

OpenZeppelin is a premier crypto cybersecurity technology firm providing tools and smart contract libraries for secure dApp development. 

They've audited prominent organizations like Coinbase, Ethereum Foundation, Aave, Compound, and The Graph, protecting over $10 billion worth of assets. Their audit phases encompass contact, quote, audit, report, fixes, and optional report publication.

6. ChainSecurity

Steering its blockchain and smart contract security expertise, ChainSecurity has solidified its reputation through collaboration with over 85 prominent crypto organizations, including Compound, Maker, Rarible, Kyber Network, and Curve. Boasting a seasoned team composed primarily of Ph.D. scholars and engineers from esteemed Swiss universities, alongside former Big 4 professionals, 

ChainSecurity has been a cornerstone of the smart contract audit landscape since 2017. This extensive experience extends to complex DeFi projects and high-impact enterprise initiatives.

7. Certora

Hailing from Israel, Certora brings a unique angle with its focus on self-serve automated platforms and formal verification, ensuring code adherence to specifications. DeFi giants like Aave, Balancer, and Maker have sought refuge in Certora's tools against potential security breaches. 

Their accomplishments span over 2 million Solidity smart contract code lines, safeguarding a total value locked (TVL) exceeding $32 billion.


In the Web3 landscape, security is not a luxury but a necessity. The vulnerabilities inherent in smart contracts demand proactive measures to safeguard projects from malicious intent. 

Smart contract auditing is an essential practice that mitigates risks, ensures transparency, and upholds the integrity of the blockchain ecosystem. 

By entrusting the task to one of the top-tier auditing firms mentioned above, you can confidently embark on your Web3 journey, knowing that your project is fortified against potential threats. 

Remember, in the world of Web3, security isn't an option – it's fundamental and indispensable.

If you want relevant Web3 knowledge, keep up with our blog updates and engage with our team to help market your Web3 project to the global limelight.

We offer a wealth of valuable resources to support you in embarking on your Web3 Marketing venture; check out Lunar Academy.

Tim Haldorsson
CEO of crypto and Web3 marketing agency Lunar Strategy, involved in the crypto scene since 2017. Provides forward-thinking Web3 marketing insight as a contributor to Cointelegraph, Rolling Stone, Daily Coin, NFT Plazas, and Finance Magnates.
Jack Haldorsson
CMO at Lunar Strategy. Been in the crypto space since 2017. Jack leverages his know-how of the blockchain ecosystems and strong KOL relationships to execute result-focused strategies that amplify brand storytelling, drive awareness and grow the project sustainably with the help of Influencer relations.
Adam Westerén
Head of Sales
Adam's passion is to create self-sustainable communities in the Web3 world. He enjoys when you create a Web3 community that can grow by itself. This is what he does in his current role as Head of sales.
William Rejström
As a Community Manager at Lunar Strategy, I'm passionate about finding new ways to connect people, add value and build strong community relationships.
Shann Holmberg
As head of growth at Lunar Strategy, I understand the significant shift away from traditional marketing strategies that Web3 projects require.
Nick Ballanutsa
Crypto Content Creator
Crypto Content Creator, Nick is creating engaging Twitter threads & posts for leading crypto & NFT companies.
Vide Haldorsson
Influencer Manager
Influencer Manager at Lunar Strategy.
Johnny Pedro
Head of Partnerships
Head of Partnerships at Lunar Strategy, creating win-win solutions for Web3 companies. You might have heard his music on Tomorrowland from his previous ventures in the music industry.
Jarrod Frankel
Head of Community
Jarrod is responsible for the teams that provide both engaging social media content and enticing and informative articles for our clients.
Tayler McCracken
Editor at Coin Bureau
Tayler McCracken is the Editor-in-Chief of the Coin Bureau, a leading publication that provides cryptocurrency education.
Vineet Nair
As a web3 storyteller, Vineet brings a wealth of experience in content, journalism, and management, with hands-on knowledge of metaverses, NFTs, AI, and finance.
Hassan Shafiq
Lunar Strategy
Lunar Strategy.
Mairead Finlay
British writer specialising in NFTs, luxury lifestyle & travel based in Portugal. Previous publications include Business Insider, LoveEXPLORING, The Guardian and My French Country Home Magazine. Previously the SEO Editor of tech & startup website TechRound.
Sandra Vukovic
Content & Marketing Specialist
Content & Marketing Specialist at Lunar Strategy.
David Kevin Jeppesen
Lunar Strategy
Raised in the spring of technology, solving problems and finding simple digital solutions is part of my nature. I’m a teachable individual who is always eager to learn and develop as a person.
Julieta Ose
Crypto Content Creator
Crypto Content Creator at Lunar Strategy.
Gino De Graaf
Google Ads Specialist
Google Ads Specialist at Lunar Strategy.
Sam Runge
Media Manager
Lunar Strategy.
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