Smart contracts audit companies are known for their expertise in reviewing and assessing the security and functionality of smart contracts. Here is a list of the top 5 companies based on their expertise, expertise, and reputation.

1. CertiK
2. SolidProof
3. Hacken
4. QuillAudits
5. ConsenSys Diligence

Smart Contract

A smart contract is a self-executing digital contract that is implemented on a blockchain platform. It is a computer program that automatically enforces and executes the terms of an agreement between parties without the need for intermediaries or centralized control.

Smart Contract

Smart contracts are built using programming languages specifically designed for blockchain platforms, such as Solidity for Ethereum, C# for Stratis, Python for Algorand, and Rust for Near. They define the rules and conditions of an agreement, and once deployed on the blockchain, they are immutable and tamper-resistant.

The key characteristics of smart contracts include:

  • Autonomy: Smart contracts operate autonomously, executing the predefined instructions without the need for human intervention.
  • Trust: Smart contracts are executed on a decentralized blockchain, which ensures transparency, immutability, and trust among participants. The contract’s execution and outcomes are verifiable by all parties involved.
  • Security: Smart contracts leverage the security features of blockchain technology, such as cryptographic encryption and consensus mechanisms, to protect against tampering and unauthorized access.
  • Efficiency: By eliminating the need for intermediaries or manual enforcement, smart contracts can streamline and automate the execution of agreements, potentially reducing costs and improving efficiency.
  • Transparency: The transparent nature of blockchain allows all participants to view and verify the contents and execution of a smart contract, fostering trust and accountability.

Smart Contract Audit

A smart contract audit is a comprehensive review and analysis of a smart contract’s code to identify vulnerabilities, security risks, and potential issues. Smart contracts are self-executing agreements with the terms of the agreement directly written into code. They run on blockchain platforms, such as Ethereum, and are designed to automate the execution and enforcement of agreements without the need for intermediaries.

Smart Contract Auditing

Given that smart contracts handle valuable assets, financial transactions, and sensitive data, it is crucial to ensure their security and reliability. Smart contract audits aim to identify potential vulnerabilities and weaknesses in the code that could lead to unintended behaviors, bugs, or security breaches.

During a smart contract audit, security experts or auditors carefully examine the code to assess its quality, adherence to best practices, and alignment with the desired functionality and requirements. The audit process typically involves the following steps:

Code Review: The auditors analyze the smart contract’s code, reviewing its structure, logic, and implementation details. They look for vulnerabilities such as reentrancy bugs, integer overflows, logic errors, or any other issues that could lead to unintended consequences or security breaches.

Security Analysis: Auditors assess the smart contract for potential security vulnerabilities, including susceptibility to hacking attacks, unauthorized access, or manipulation. They also examine the contract’s interactions with other contracts or external systems, identifying potential risks or attack vectors.

Functionality Evaluation: The auditors verify that the smart contract’s code functions as intended and meets the desired requirements. They check if the contract accurately enforces the specified rules, handles edge cases correctly, and ensures data integrity.

Best Practices and Standards: Auditors assess whether the smart contract adheres to industry best practices, coding standards, and guidelines. They look for practices that enhance security, efficiency, readability, and maintainability.

Documentation Review: Auditors examine the documentation accompanying the smart contract, assessing its clarity, completeness, and accuracy. Documentation should provide a clear understanding of the contract’s purpose, functionality, and usage.

Report and Recommendations: After the audit, auditors provide a detailed report summarizing their findings, including identified vulnerabilities, risks, and recommended remediation steps. The report assists the contract developers in addressing the identified issues and improving the overall security and reliability of the contract.

By conducting a thorough smart contract audit, developers and organizations can minimize the risks associated with deploying smart contracts, enhance their security, and ensure that the contracts function as intended. It is an essential step to promote trust, confidence, and the widespread adoption of blockchain-based applications and platforms.

1. CertiK

Certik is one of the most reputed and well-known companies that specialize in Web3, blockchain, and smart contract security. CertiK was founded in 2018 by professors from Yale University and Columbia University1 and is based in New York, New York2. The co-founder of CertiK is Ronghui Gu who attended Yale University.

CertiK has audited several thousands of clients with over a $364 billion market cap. CertiK also allows a transparent report of which token smart contracts they have audited and certified.

Securing the Web3 World

CertiK offers a range of services focused on verifying the security, correctness, and reliability of smart contracts. Some of the key services provided by Certik include:

Smart Contract Audits: Certik conducts comprehensive audits of smart contracts to identify potential vulnerabilities, security loopholes, and bugs. They employ a combination of manual review and automated analysis tools to assess the codebase and ensure its security.

Formal Verification: Certik utilizes formal verification techniques to rigorously analyze the smart contract’s code and mathematically prove its correctness. This helps to eliminate any potential flaws or vulnerabilities and ensures the contract operates as intended.

Security-as-a-Service (SecaaS): Certik offers Security-as-a-Service, which involves continuous monitoring and security analysis of smart contracts. This service helps to detect and mitigate security risks and vulnerabilities that may arise during the contract’s lifecycle.

CertikShield: CertikShield is a security product offered by Certik that protects against hacks and vulnerabilities in smart contracts. It acts as an insurance-like coverage to safeguard funds and assets held within smart contracts, offering peace of mind to users.

Vulnerability Remediation: In addition to identifying vulnerabilities, Certik also provides guidance and support for remediating any security issues discovered during the audit process. They work closely with project teams to address and resolve vulnerabilities in the smart contract code.

Certik has established itself as a reputable company in the blockchain security space, and its services are widely recognized for their thoroughness and expertise. It’s always advisable to refer to Certik’s official website or contact them directly for the most up-to-date and accurate information about their specific services and offerings.

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2. Hacken

Hacken is a cybersecurity company that provides various services, including smart contract audits. They specialize in blockchain security and offer comprehensive assessments to identify vulnerabilities and ensure the integrity of smart contracts.

Hacken Services

Some of the services offered by Hacken about smart contracts include:

Smart Contract Audits: Hacken conducts in-depth audits of smart contracts to identify potential security risks and vulnerabilities. Their team of experts reviews the contract’s code, functionality, and design to ensure its security and reliability.

Vulnerability Assessment: Hacken performs vulnerability assessments to identify weaknesses and potential exploits in smart contracts. They analyze the codebase, conduct penetration testing, and employ other security testing methodologies to identify vulnerabilities and recommend remediation strategies.

Code Review: Hacken offers code review services to evaluate the quality, efficiency, and security of smart contract code. They assess the codebase for adherence to best practices, proper error handling, and potential security pitfalls.

Security Consulting: Hacken provides security consulting services to assist organizations in designing and developing secure blockchain solutions. They offer guidance on security best practices, architecture design, and risk management strategies specific to smart contracts.

Incident Response: In the event of a security incident or breach involving a smart contract, Hacken provides incident response services to help organizations mitigate the impact and recover from the incident. They conduct forensic analysis, identify the root cause, and provide recommendations for future prevention.

Hacken has a strong reputation in the cybersecurity space and has worked with numerous blockchain projects to enhance its security posture. It’s important to refer to Hacken’s official website or contact them directly for the most up-to-date and accurate information about their specific services and offerings.

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3. SolidProof

SolidProof is a German-based security audits firm that specializes in inspecting smart contracts to enhance user trust in DeFi projects. The firm utilizes various time-proven tests to uncover vulnerabilities in blockchains1. They have served over 805 audits and 638 KYC2. The co-founder of SolidProof is Mails Nielson. He has helped build it into one of the most efficient blockchain auditors in the crypto sphere.

SolidProof offers a wide range of services including smart contract audits, KYC, and marketing services. They perform a background check on the project and if the KYC is successful, all data is stored offline on an AES-256 encrypted disk1. They also provide audit services where they check the code for vulnerabilities and issue a final audit report after all vulnerabilities are fixed or acknowledged.

SolidProof has servered 805 clients and has conducted 773 audits and 328 KYC.

KYC and Audits are two key services of SolidProof.

Smart Contract Audits: SolidProof conducts comprehensive audits of smart contracts to identify potential vulnerabilities, bugs, or security risks. This typically involves a thorough review of the contract’s code, functionality, and design.

Security Assessments: The company may perform in-depth security assessments of blockchain platforms, decentralized applications (DApps), and related infrastructure. This could involve identifying security weaknesses, recommending improvements, and assessing the overall security posture.

Code Review: SolidProof may offer code review services, examining the quality, efficiency, and adherence to best practices in the smart contract’s codebase. This helps ensure that the code is well-structured, maintainable, and optimized.

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4. QuillAudits

QuillAudits, founded in 2021, is one of the newer and fastest-growing smart contracts audit security companies. Founded by Preetam Rao and Rajat Gahlot, QuillAudits is based in Dubai. According to their websites, QuillAudits has secured more than 850 projects and protected $16 billion.


If QuillAudits is a smart contract audit company, its services might be similar to those offered by other established audit firms in the industry. Typically, smart contract audit companies provide services such as:

Smart Contract Audits: Conduct comprehensive reviews of smart contract code to identify potential vulnerabilities, bugs, or security risks.

Security Assessments: Performing in-depth security assessments of blockchain platforms, decentralized applications (DApps), and related infrastructure to identify and address security weaknesses.

Code Review: Offering code review services to ensure quality, efficiency, and adherence to best practices in the smart contract’s codebase.

Best Practices and Compliance: Guiding industry best practices and compliance standards for smart contract development, including regulatory requirements and security measures.

Consulting and Advisory Services: Offering consulting and advisory services related to blockchain and smart contract development, including secure architecture design and overall blockchain security guidance.

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5. ConsenSys Diligence

ConsenSys Diligence is a prominent company that specializes in smart contract security and offers a range of services to ensure the integrity and reliability of blockchain-based systems. As part of the larger ConsenSys organization, ConsenSys Diligence focuses on security audits and assessments.

ConsenSys Diligence

Some of the services provided by ConsenSys Diligence include:

Smart Contract Audits: ConsenSys Diligence conducts thorough audits of smart contracts to identify security vulnerabilities, bugs, and potential risks. Their team of experts reviews the contract’s codebase, architecture, and functionality to ensure its security and reliability.

Automated Tools and Analysis: ConsenSys Diligence leverages automated analysis tools and proprietary techniques to enhance the efficiency and effectiveness of its audits. They combine manual review with automated analysis to identify potential vulnerabilities and risks.

Security Assessments: ConsenSys Diligence provides comprehensive security assessments for blockchain platforms, decentralized applications (DApps), and related systems. They evaluate the overall security posture, identify weaknesses, and recommend improvements to mitigate potential risks.

Code Review and Best Practices: ConsenSys Diligence offers code review services, examining the quality, efficiency, and adherence to best practices in smart contract code. They provide recommendations to improve code quality and security.

Research and Development: ConsenSys Diligence actively engages in research and development initiatives related to blockchain security. They contribute to the advancement of security practices, identify emerging threats, and develop innovative solutions to address evolving security challenges.

ConsenSys Diligence is well-regarded in the blockchain industry and has worked with numerous high-profile projects. It’s advisable to refer to ConsenSys Diligence’s official website or contact them directly for the most up-to-date and accurate information about their specific services and offerings.

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Smart contract auditing is a critical step in ensuring the security and reliability of blockchain-based applications. The top 5 smart contract auditing companies mentioned in this article, including CertiK, SolidProof, Hacken, QuillAudits, and ConsenSys Diligence, have proven expertise in auditing smart contracts and helping projects identify and address vulnerabilities. Engaging with a reputable auditing company can significantly reduce the risks associated with deploying smart contracts and enhance overall security.


Q. Why is smart contract auditing important?
A. Smart contract auditing is important to identify vulnerabilities and potential risks in the code. It helps prevent security breaches, financial losses, and other adverse consequences resulting from exploitable smart contracts.

Q. How long does a smart contract audit take?
A. The duration of a smart contract audit depends on the complexity of the code and the scope of the audit. It can range from a few days to several weeks, with more comprehensive audits taking longer to complete.

Q. Can smart contract audits guarantee 100% security?
A. While smart contract audits significantly enhance security, they cannot guarantee 100% security. Audits aim to identify vulnerabilities, but new threats can emerge over time. Regular audits and ongoing security measures are recommended.

Q. How much does a smart contract audit cost?
A. The cost of a smart contract audit varies depending on factors such as the complexity of the code, the scope of the audit, and the auditing company. Prices can range from a few thousand to tens of thousands of dollars.

Q. Can I perform a smart contract audit myself?
A. While it is possible to conduct a self-audit, it is recommended to engage with professional auditing companies. Their expertise, experience, and specialized tools ensure a thorough and reliable assessment of smart contracts.