10 Top Blockchain Penetration Testing Firms In 2026

Blockchain security extends beyond code reviews. Interconnectedness within DeFi, as well as wallets, bridges, exchanges and other applications, creates additional attack vectors. Consequently, adversaries have ample opportunities to launch successful attacks.

One of the security measures being taken by projects is the engagement of pen-testing firms. The goal of this article is to provide an overview of the leading blockchain pen-testing firms. This overview will include the firms’ attack surfaces, the types of security work completed by the firms, and the firms’ clientele.

What Is Blockchain Penetration Testing?

Blockchain penetration testing is designed to locate weaknesses in blockchain applications, architecture, and associated services. Attacks are targeted at blockchain wallets and an arrays of blockchain nodes, bridges, APIs and other blockchain services.

Penetration testing may include both manual and automated techniques. In addition, threat modeling and the use of exploits may be employed. The objective of the testing is to recognize vulnerable conditions, and improve the defensive structures of the blockchain.

Key Points & Top Blockchain Penetration Testing Firms

Company	Explanation
Trail of Bits	Provides deep security research, manual reviews, and advanced multi-language smart contract assessments.
Hacken	Delivers Web3 cybersecurity audits, blockchain testing, dApp assessments, and CCSS compliance services.
PeckShield	Provides smart contract auditing, penetration testing, vulnerability discovery, and continuous blockchain threat monitoring.
Quantstamp	Secures digital assets through rigorous, multi-step smart contract verification and security auditing processes.
ChainSecurity	Specializes in meticulous smart contract and EVM-compatible protocol security assessments for blockchain projects.
Sigma Prime	Focuses on consensus security, blockchain infrastructure, and Rust-based protocol security assessments for networks.
Hashlock	Provides multi-chain auditing and penetration testing across Solidity, Rust, Cairo, Move, Noir.
Sherlock	Operates competitive security auditing networks covering EVM and emerging cross-chain blockchain architectures.
Astra Pentest	Combines automated and manual penetration testing for Web3 applications, dApps, APIs, cloud infrastructure.
Trilight Security	Performs advanced blockchain penetration testing for DeFi, smart contracts, and Web3 technology stacks.

10 Top Blockchain Penetration Testing Firms

1. Trail of Bits

Founded in 2012, Trail of Bits has extensive experience in blockchain security. They primarily focus on the blockchains, DeFi and NFTs ecosystems and engineers. They perform evaluations on Ethereum, Solana and other custom L1 networks.

Formal verification and symbolic execution are part of their toolkit, as are other tool-assisted and manual analysis techniques. They evaluate a broad array of components, including smart contracts and wallets. Their methodology incorporates threat modeling.

Attack Surfaces include security and logic flaws in smart contracts. Other attack surfaces include man-in-the-middle (MEV) attacks and state transition flaws.

Documented work includes audit of the Compound protocol. Their primary strength is deep knowledge of cryptography. Best-Fit Project: L1/L2 networks, DeFi, and de-centralized applications (dApps) requiring formal verification and exploit-resistant design.

Trail of Bits Features

• Expertise: Blockchain, DeFi, NFTs, and other Layer 1s.
• Technologies: Formal and symbolic methods, and traditional analysis.
• Testing: Smart contracts and wallets, Logic and State transitions, MEV.
• Primary Market: Layer 1s and 2s, DeFi.

2. Hacken

Hacken offers a variety of Web3 security services and products spanning various industries such as DeFi, Crypto Exchanges, Gaming and Enterprise Blockchain. Their customer base is comprised of hundreds of clients including companies, auditing firms and organizations.

Their core technology consists of automated threat intelligence and static analysis. They perform security assessments on numerous components in the Web3 ecosystem such as decentralized applications (dApps) and infrastructure, digital wallets, cryptocurrency exchanges and bridges.

To identify potential vulnerabilities in a dApp, their team performs automated static analysis and reviews the application code to identify potential issues and develop exploits. Documented work includes auditing Avalanche and Gate.io projects.

Their strength is the speed and quality of the audits. Hacken is trusted by the Blockchain and Crypto community. Best-Fit Project: Cryptocurrency exchanges and DeFi projects aimed at trading digital assets.

Hacken Features

• Expertise: Web3 (DeFi, CEXs, CEGs, BECs, etc.)
• Technology: Static Analysis and Code Review.
• Testing: Applications, Wallets, Exchanges, Bridges, Infrastructure.
• Market: Crypto Exchanges and DeFi Custodians.

3. PeckShield

PeckShield is a blockchain security and threat intelligence company. Their product suite focuses on performing monitoring and threat intelligence tasks on a myriad of decentralized applications (dApps) and infrastructure spanning various blockchain networks.

PeckShield has developed automated threat intelligence and behavioral analysis engines to identify common attack vectors such as reentrancy and price oracle attacks. Documented work includes Incident Response and Threat Intelligence activities for large blockchain exploitation incidents such as the Ronin and Poly Networks hacks.

PeckShield performs a wide range of security assessments and audits for decentralized finance (DeFi) projects. Their strength is providing proactive Threat Intelligence and Incident Response. Best-Fit Project: Automated Monitoring and Threat Intelligence activities for high capitalization DeFi projects and blockchain bridges.

PeckShield Features

• Expertise: Blockchain, Threat Intelligence, and Incident Response.
• Technology: Automated Threat Intelligence and Behavior Analysis.
• Testing: DeFi and Infrastructure.
• Market: DeFi Projects and Bridges.

4. Quantstamp

Quantstamp was built to provide enterprise level blockchain security, and has clients across a variety of blockchain infrastructures and platforms, including Solana, Ethereum, and Polygon. They provide automated and formal methods to verify and assess blockchain security.

They provide security assessment and validation services for a broad range of products including blockchain infrastructure, bridges, and smart contracts. They accomplish this through a combination of formal verification, manual code review, and security testing.

Some of the security risks they assess include validator logic, governance contracts, staking contracts, and economic incentive contracts. They have performed security assessments for several DeFi and cross chain platforms, and have also assessed several Cardinal and Ethereum 2.0 staking contracts.

They also have a blockchain security assessment and validation service for enterprise clients. Best Project Fit: DeFi applications where a bank is involved (Staking and other DeFi platforms).

Quantstamp Features

• Expertise: Enterprise Blockchain (Ethereum, Solana, etc.).
• Technology: Formal Methods, Automated and Traditional Methods.
• Testing: DeFi and Infrastructure.
• Market: DeFi and Enterprise Blockchain.

5. ChainSecurity

ChainSecurity focuses on security for Ethereum based products and services. They utilize a range of methods to verify blockchain security and provide automation to simplify the process. They assess a broad range of products and services including DeFi platforms and DeFi smart contracts.

They have a strong focus on proving the correctness of smart contracts and assessment of invariants. Their primary service is the assessment of economic finality conditions, where they analyze if an exploit is possible.

Their primary differentiator is their methodology and focus on proving the correctness of smart contracts. Best Project Fit: High assurance smart contracts for DeFi platforms.

ChainSecurity Features

• Technology: Includes automated methods, invariants, and analysis methods with a focus on correctness.
• Testing Scope: Contracts, conditions, invariants, and contract logic.
• Best Fit: Used for DeFi protocols to analyze invariants and contracts.
• Expertise: ChainSecurity offers assessment services for smart contracts and other DeFi and Ethereum based products.

6. Sigma Prime

Sigma Prime has developed an Ethereum client (Lighthouse) and has focused on lower level protocol development and security. Their technologies include fishing and various verification and analysis tools. They analyze crypto and smart contract protocols as well as consensus and validation layers.

Their approach is modeling coupled with fuzzing and simulation. Areas of concern include contract and validation logic, consensus faults and failures, and cryptographic errors.

They have analyzed Eth 2.0 and other DeFi protocols. Their strong suit is evaluating and designing protocols. The best fit is complex blockchain and cryptographic protocols and systems.

Sigma Prime Features

• Expertise: Blockchain, consensus, validation-layer security, and Ethereum client software.
• Technology: Sigma Prime leverages various models and integration of simulation, fuzzing, and verification.
• Testing Scope: Logic of protocols, validation system faults, and cryptographic threats.
• Best Fit: Blockchain projects with complex consensus and cryptography.

7. Hashlock

Hashlock offers Web 3.0 security and risk assessment as well as auditing services for smart contracts and infrastructure. Their offerings range from automated scanners to tools for manual exploitation. They consider the security of operational processes and infrastructure.

Their main methodology is a combination of automated and manual assessment. Areas of concern include smart contract logic, infrastructure and governance, and process and configuration controls. They have assessed numerous NFT and DeFi projects. Their main differentiator is assessing a projects security and operations concurrently. The best fit is Web3 NFT and DeFi projects.

Hashlock Features

• Expertise: Web 3.0 security and risk assessment.
• Technology: Relies on automated scanners, and uses manual methods to find security vulnerabilities.
• Testing Scope: Contracts and surrounding infrastructure and operational control systems.
• Best Fit: Combines security and risk assessment for DeFi and NFT projects.

8. Sherlock

Sherlock utilizes an innovative model for the audit marketplace that encourages and allows the best auditors to work collaboratively and competitively in order to analyze DeFi protocols and issue findings. Their framework encompasses community-based audit processes, automatically (or semiautomatically) sensitive contract analyses, and risk modelings.

Sherlock’s parameters of review encompass contract code, tokenomics, and protocols’ logic and controls. Their framework emulates competitive audits, combines with continuous review, and leverages adversarial thinking to identify vulnerabilities.

Their attack surface encompasses logic flaws, governance and control manipulations, and economic attacks. Their clientele includes notable DeFi protocols (GMX and Euler). High-impact audits are crowd-sourced. Best-Fit Project: DeFi protocols requiring an assortment of auditors in competitive analyses and deep-seated economic risk assessments.

Sherlock Features

• Area of Expertise: Specializes in security auditing competitions involving DeFi protocols and risk assessment.
• Technology: Tools and methods for competitive auditing, e.g., automatic analysis and review.
• Assessment of: Financial logic and attacks on the economy of smart contracts, tokenlists, governance, and protocols.
• Clientele: DeFi protocols requiring competitive and economic risk assessments and audits.

9. Astra Pentest

Astra Pentest offers a range of security services for web2 and web3 applications. Their services and products include automated and semiautomated contract audits and security analyses of cloud and blockchain environments. They review and audit contracts, backends, APIs and wallets.

Their methodology encompasses traditional application and contract audits. Their attack surface includes logical flaws and vulnerabilities in contracts, APIs, and architectural and configural misalignments of cloud and blockchain environments.

Their clientele includes Financial and Centralized exchanges, DeFi applications, Supply Chain and Logistics applications and other Enterprise Blockchain solutions. High impact audits are crowd-sourced. Best-Fit Project: Financial, Centralized and Decentralized Exchanges, Web3 Applications and other Enterprise Blockchain Solutions.

Astra Pentest Features

• Area of Expertise: Web 2 and 3, and Enterprise Blockchain applications security.
• Technology: Relies on automation and combines traditional security assessments.
• Assessment of: Applications, wallets, backends, APIs, cloud and other services.
• Clientele: Web 3 and DeFi applications.

10. Trilight Security

The blockchain penetration testing service offered by Trilight Security encompasses infrastructure and operational security as well as the threat modeling of smart contracts. The company provides automated and semi-automated security testing tools.

They test smart contracts, blockchain nodes and wallets, as well as blockchain project back-end systems and APIs. They simulate advanced attacks and test the security of infrastructure and operations of the client. They identify security and business logic flaws in smart contracts and back-end systems, as well as governance and interface risks.

They have performed various security audits of DeFi and other web 3.0 projects. Their core strength is the assessment of security of DeFi and other blockchain projects. Best-Fit Project: DeFi projects and other blockchain projects requiring assessment of security of their infrastructure and other mechanisms of the project.

Trilight Security Features

• Area of Expertise: Blockchain and delegated assessments of related protocols and infrastructures.
• Technology: Automated and additional assessments.
• Assessment of: Contracts, infrastructural nodes and wallets, and other integration services.
• Clientele: Blockchain and DeFi projects.

How We Evaluated These Blockchain Pentesting Firms

Blockchain and related Technology Expertise: Assessed experience with blockchain ecosystems, programming and scripting languages, blockchain protocols, and blockchain and cryptocurrency security tools and technologies.

Testing Coverage: Assessed testing of different components of blockchain ecosystems (smart contracts, blockchain API’s, blockchain wallets, blockchain node’s, blockchain bridge’s, blockchain infrastructure, etc.) and threat modeling to identify attack surfaces.

Testing Approaches and Tools: Considered the use of a combination of tools and approaches such as manual testing and review, automated analysis, fuzzing, threat modeling and exploitation.

Security Work: Evaluated published security work including security audits, research, and vulnerabilities disclosures.

Other Factors: Evaluated firm’s willingness to perform testing and assessments and issue reports to clients, advise clients on remediation, and perform testing after the clients’ systems and applications have been updated to address the issues.

Conclusion

Conclusion When selecting a blockchain penetration testing company, consider several factors, including the company’s ability to perform penetration tests across various blockchain domains, methods and techniques used, remediation services, and track record.

\The best company is one that can augment your blockchain team. Pay special attention to review smart contract, wallet and other API testing; evaluation of blockchain bridges, blockchain nodes and blockchain infrastructure. Engaging a firm to perform a blockchain penetration test can help identify vulnerabilities and help strengthen your blockchain environment.

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