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Trail of Bits

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Who is Trail of Bits?

Trail of Bits is a security research and engineering firm that provides software security assessments, adversarial testing, and cryptographic and blockchain security services to organizations that build and operate complex software systems.

  • Smart contract and blockchain security audits
  • Penetration testing and offensive security assessments
  • Cryptographic protocol and implementation reviews
  • AI and machine learning system security evaluations
  • Open source static analysis and fuzzing tools
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More About Trail of Bits

Trail of Bits positions its offerings as security engagements delivered to software developers, protocol teams, and enterprise security organizations. Engagements typically combine manual code review with automated analysis, and reports document findings with severity ratings and remediation guidance. Engagements have covered software developed for technology companies, financial services firms, and decentralized protocol projects.

Technical work centers on program analysis, fuzzing, symbolic execution, and formal verification. Tools published by the firm include Slither, a static analyzer for Solidity source code, and Echidna, a property-based fuzzer for smart contracts. Its cryptography practice reviews implementations of protocols and primitives, while its offensive security work covers network, web, mobile, and cloud environments.

Smart contract assessments address Ethereum Virtual Machine bytecode and Solidity source code. AI engagements examine model serving pipelines, prompt injection exposure, and training data risks. Infrastructure reviews address container orchestration, cloud identity configuration, and access control design. These engagements apply established vulnerability classifications and secure development practices as reference points for findings.

Its work resembles that of other specialized security consultancies and audit firms. The firm differs in its emphasis on open source tooling and publicly available research. For organizations with complex codebases, independent review before deployment reduces the likelihood that defects reach production. Published tooling also allows internal engineering teams to apply the same analysis techniques on an ongoing basis.

Within the information technology sector, the organization's activities fall under cybersecurity, specifically offensive security, penetration testing, and vulnerability assessment, with adjacent coverage in application, cloud, and AI security. Active solution areas include smart contract auditing, cryptographic review, application security testing, and AI system evaluation.

Our description of Trail of Bits. Updated October 2026.

Market segments

  • Information Technology / Cybersecurity / Exposure, Risk & Governance / Offensive Security: Pentesting, Bug Bounty & Breach/Attack Simulation

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Headquarters
New York, NY

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