10 Blockchain Security and Smart Contract Audit Firms (2026)

This guide compares 10 established blockchain security firms offering services such as smart contract audits, protocol and infrastructure reviews, penetration testing, fuzzing and formal verification. An audit is one layer of risk reduction, not a guarantee: its value depends on the exact code commit and configuration reviewed, the scope, the team, the remediation process and whether the deployed contracts match the audited version.

How this list was refreshed (13 August 2026): we checked whether each firm still publishes current services, tools or public assessments. The order is not a universal quality ranking because the best fit depends on the chain, language, protocol design and engagement scope. Ask for recent reports in the same technical domain before hiring any firm.

Consequently, security solutions, tailored to the volatile nature of blockchain technology and its components, have started making moves to isolate and neutralize security threats common in the blockchain terrain. In this article, I will highlight and explore the workings of the top companies in the blockchain security niche.

It is therefore extremely important for security audits of projects, exchanges and blockchains to be done. Users must also know what security tests have been performed and if any red flags were raised.

Hacken

Website: https://hacken.io/

Hacken performs a wide range of security services for its clients. These suites of services include blockchain security consulting, web/mobile penetration testing, coordination of bug bounty programs, crypto exchange ratings, among other things. Although Hacken offers a long list of services targeted at blockchain and crypto firms, its ecosystem, however, encompasses security products ideal for IT companies as a whole. The company has built a commendable reputation as a security risk assessment for companies requiring a digital environment to create or enable services for their consumers.

Its current service menu includes smart contract, blockchain infrastructure, cross-chain bridge, wallet and cryptography audits, penetration testing, red teaming and proof-of-reserves verification. Hacken also publishes its smart contract review methodology, which combines manual review, automated tooling, structured testing and remediation verification.

Quantstamp

Website: https://quantstamp.com/

Quantstamp is a blockchain security company from Y Combinator’s W18 batch. Its current work covers smart contracts, infrastructure, economic exploits and related security services across multiple languages and ecosystems. The most useful evidence for prospective clients is its public assessment archive, which contained hundreds of reports and current 2026 engagements when this article was refreshed.

Trail of Bits

Website: https://www.trailofbits.com/

Trail of Bits prides itself as a network of developers with the capabilities of identifying and fixing loopholes in software, devices, or codes. In other words, the solution provides an array of software security services that encompass smart contract audits, blockchain security research, software development, and so on. Over the years, Trail of Bits has developed formidable security tools for smart contracts. Some of these blockchain-focused solutions are Crytic, Slither, and Echidna.

Apart from that, Trail of Bits developed the popular AlgoVPN. As well, it has a lot of security publications on GitHub, including public reports for 0x Protocol, Compound, NuCypher, and MakerDAO, which are some of its clients.

OpenZeppelin

Website: https://openzeppelin.com/

The OpenZeppelin team is mostly known for its development of Solidity libraries known as OpenZeppelin Contracts. These libraries are used in most Solidity projects as a tested and standard template for contracts deployable on decentralized applications. Developers can integrate this solution through OpenZeppelin’s native SDK. Besides development, OpenZeppelin has a strong focus on smart contract security and audit services.

OpenZeppelin also created Ethernaut, a Web3/Solidity war game in which developers learn by exploiting vulnerable contracts. Its 2026 security offering extends beyond one-off smart contract audits to infrastructure and zero-knowledge reviews, threat modelling, deployment verification, monitoring and continuous security work. OpenZeppelin reported more than 900 completed audits on its security services page when checked.

ConsenSys Diligence

Website: https://diligence.consensys.net/

US-based ConsenSys is one of the biggest and prominent blockchain incubators in the industry. Unlike other security firms mentioned on this list, ConsenSys dedicates its resources and technological know-how to the development of Ethereum blockchain applications and software, especially financial infrastructures. As such, its product, ConsenSys Diligence, offers security analysis for smart contracts. This audit product is at the cutting edge of sophisticated “cryptography, blockchain technology, and crypto-economic incentive analysis.”

The former MythX automated scanning suite has been sunset. Mythril remains open source, its Harvey component evolved into Diligence Fuzzing, and Consensys Diligence continues to provide smart contract audit and testing services. Teams should evaluate the current tools rather than choosing Diligence based on the retired MythX product.

Certik

Website: https://certik.io/

CertiK provides smart contract and blockchain audits alongside monitoring, investigation and security-rating products. It is associated with formal-verification techniques, but clients should distinguish a conventional audit from a mathematical proof and should inspect the methodology, scope, commit hash, unresolved findings and remediation status in the actual report. Large “assets secured” or “lines audited” marketing totals are not substitutes for project-specific evidence.

LeastAuthority

Website: https://leastauthority.com/

LeastAuthority is a cybersecurity consulting firm with its main focus on privacy. It classifies itself as an enabler of private and disruptive storage solutions. At the moment, the platform has two major products available to its users. The first, Privatestorage (formerly S4), is a centralized system that provides storage infrastructure to end-users and offers them the autonomy over the collection, processing, and distribution of their private data. On the other hand, its second product, Tahoe LAFS, enables a decentralized, distributed, and fault-tolerant storage facility.

 In addition to providing different storage architectures, LeastAuthority has published security reports for Ethereum, Tezos, and others. It also works with developers throughout their development cycles to ensure that their projects are not susceptible to security threats. 

ChainSecurity

Website: https://www.chainsecurity.com/

ChainSecurity joined PwC Switzerland in 2020 and later spun out amicably as an independent company. It performs smart contract and protocol reviews and has roots in formal methods research, including work around Securify. The old “PwC Switzerland (former ChainSecurity)” label is therefore no longer accurate; review current reports and supported ecosystems directly on ChainSecurity’s site.

Slowmist

Website: https://www.slowmist.com/en/

Slowmist is China’s leading blockchain security company. They perform extensive blockchain security services that include smart contract audits, blockchain security audits, wallet security testing, and much more. Slowmist also has a safe staking project for blockchain ecologies, which delivers real-time data on the growth and security patterns of EOS, Cosmos, Vechain, and other top blockchain projects. Another interesting bit of detail about this platform is its powerful firewall project for EOS smart contracts, named FireWall.X.

Likewise, Slowmist is constantly tracking and publishing data and stats about security situation on crypto exchanges through their Blockchain Threat Intelligence (BTI) service. 

Runtime Verification

Website: https://runtimeverification.com/

Runtime Verification is a research and development company focused on formal verification. According to the information on its website, this solution designs standard models for high-value applications and uses them as templates to develop security-sensitive products. Runtime Verification has developed two main smart contract security products. On the one hand, it offers smart contract correctness proofs with the help of the K framework to prove the viability of Ethereum and Cardano’s smart contracts. On the other, Firefly is a test coverage analysis tool for Ethereum smart contracts.

Additionally, Runtime Verification has worked with Ethereum Foundation on building a formal framework for Ethereum 2.0 testing.

Frequently asked questions