Secure Your Blockchain & Web3
From smart contract audits to DeFi protocol security, our blockchain security experts help organizations identify exploitable vulnerabilities before attackers do. We reduce the risk of asset loss, protocol downtime, and erosion of user trust - protecting capital, reputation, and long-term platform credibility in decentralized environments.
Why blockchain security matters now
The decentralized ecosystem has lost billions to exploits, hacks, and vulnerabilities. Smart contracts are immutable: bugs deployed are bugs forever.
Security challenges in blockchain development
Building on blockchain introduces unique security challenges that traditional cybersecurity approaches don't address.
Immutable deployments
Once deployed, smart contracts can't be patched. Vulnerabilities are permanent unless you've planned for upgrades.
High-value targets
Protocols holding millions in TVL attract sophisticated attackers with strong financial motivation.
Composability risks
Your protocol interacts with others. A vulnerability in a dependency can cascade into your system.
Flash loan attacks
Atomic transactions enable attacks impossible in traditional finance, exploiting price oracles and logic flaws.
Talent shortage
Blockchain security expertise is rare. Your dev team may lack the specialized knowledge to identify subtle vulnerabilities.
Time pressure
Fast-moving markets push for rapid launches. Security often gets compressed or skipped entirely.
Private key management
Admin keys, multisigs, and access controls are common attack vectors. One compromised key can drain everything.
Cross-chain complexity
Bridges and multi-chain deployments introduce additional attack surface and synchronization challenges.
No recourse
Unlike traditional finance, there's no bank to call. Stolen funds are usually gone forever.
Benefits of professional blockchain security services
Independent security audits from experienced blockchain specialists protect your protocol, users, and reputation.
Find critical vulnerabilities
Expert auditors catch issues your team missed: reentrancy, oracle manipulation, access control flaws, and more.
Detailed findings with code-level remediation
Prevent costly exploits before launch
Build user trust
A professional audit report signals security-first development to users, investors, and partners.
Public report demonstrates due diligence
Essential for TVL growth and partnerships
Knowledge transfer
Our auditors explain findings and best practices, improving your team's security capabilities.
Learn patterns to avoid in future development
Build internal security competency
Pre-launch confidence
Ship with confidence knowing your code has been rigorously tested by specialists.
Comprehensive coverage before mainnet
Reduce launch-day anxiety and risk
Ongoing security
Continuous security reviews as your protocol evolves, covering upgrades and new features.
Catch regressions in code changes
Maintain security posture over time
Independent validation
Third-party verification that your security claims are backed by rigorous testing.
Objective assessment from fresh eyes
Credibility for fundraising and listings
Fortify your ecosystem with blockchain security services
Comprehensive security coverage for the entire Web3 ecosystem, from smart contracts to infrastructure.
Solidity Audits
Comprehensive review of Ethereum and EVM-compatible smart contracts.
Rust/Solana Audits
Security assessment for Solana programs and Anchor-based protocols.
Move/Sui/Aptos
Audits for Move-based blockchains and their unique security model.
Formal Verification
Mathematical proofs of correctness for critical contract logic.
All audits include detailed findings reports, remediation guidance, and verification of fixes. Request an audit →
Comprehensive blockchain audit
Our structured approach combines automated tooling with deep manual review to find vulnerabilities other auditors miss.
Scoping & Planning
Define audit scope, gather documentation, and understand your protocol's design intent.
Automated analysis
Run automated tools to identify common vulnerability patterns and code quality issues.
Manual code review
Line-by-line expert review focusing on logic, access control, and protocol-specific risks.
Findings documentation
Document all findings with severity ratings, proof-of-concept exploits, and remediation guidance.
Team review & discussion
Walk through findings with your team, answer questions, and discuss remediation approaches.
Fix verification
Review your fixes to ensure vulnerabilities are properly addressed without introducing new issues.
Measurable audit deliverables
Comprehensive documentation and ongoing support to help you ship secure code.
Detailed audit report
Comprehensive findings report with severity ratings and technical details.
- Executive summary
- Technical findings
- Code references
- Severity ratings
- Remediation guidance
Vulnerability analysis
Each finding includes proof-of-concept and exploitation scenario.
- Attack vectors
- Proof-of-concept
- Impact assessment
- Likelihood analysis
- Risk rating
Remediation guidance
Specific recommendations to fix each identified vulnerability.
- Code suggestions
- Pattern recommendations
- Best practices
- Alternative approaches
Fix verification
Review of your fixes to confirm vulnerabilities are properly addressed.
- Patch review
- Regression testing
- New issue check
- Updated findings status
Public audit report
Publishable version of the report for transparency with your community.
- Cleaned findings
- Professional formatting
- Badge/certification
- Community trust
Automated tool results
Output from all static analysis and fuzzing tools used during the audit.
- Slither results
- Fuzzing coverage
- Gas analysis
- Test coverage metrics
Test suite recommendations
Suggestions for improving your test coverage based on audit findings.
- Missing test cases
- Edge case coverage
- Invariant tests
- Fuzz test suggestions
Security checklist
Protocol-specific security checklist for ongoing development.
- Pre-deployment checklist
- Upgrade checklist
- Review guidelines
- Common patterns
Post-audit support
Ongoing access to auditors for questions and clarifications.
- 30-day support
- Slack/Discord access
- Quick questions
- Implementation guidance
Audit badge
Verified badge for your website and documentation.
- Digital badge
- Verification link
- Marketing materials
- Press release support
Presentation deck
Summary presentation for stakeholders and investors.
- Key findings
- Risk overview
- Remediation status
- Security posture summary
Ongoing audit retainer
Optional retainer for continuous security reviews as you develop.
- Priority scheduling
- Discounted rates
- Upgrade reviews
- New feature audits
Frequently asked questions
Typical audits take 2-4 weeks depending on codebase size and complexity. A simple token contract might take 1 week, while a complex DeFi protocol could take 4-6 weeks. We provide accurate timelines after scoping your specific project.
Audit costs depend on code complexity, lines of code, and required depth. Simple contracts start around €15,000, while complex protocols can exceed €100,000. We provide fixed quotes after reviewing your codebase.
Ideally, get audited before mainnet launch when code is feature-complete but before deployment. We also audit protocol upgrades, new features, and periodic reviews for live protocols. Earlier is better: fixing issues in development costs less than post-deployment.
Audits provide structured, comprehensive review by dedicated experts before launch. Bug bounties provide ongoing crowdsourced testing post-launch. They're complementary: audit first, then run a bug bounty for continuous coverage.
No audit can guarantee zero vulnerabilities. Anyone claiming otherwise is misleading you. What we guarantee is rigorous, expert review using proven methodologies. Our track record shows zero post-audit exploits for verified fixes.
Yes, we can provide a publishable version of the audit report for transparency with your community. You control what's public: we can redact sensitive information while maintaining credibility.
We notify you immediately of critical findings. We provide remediation guidance and verify your fixes. Critical issues are treated with appropriate urgency.
Absolutely. We audit live protocols for upgrades, new features, or comprehensive security review. For live audits, we work carefully around deployment schedules and can coordinate disclosure timing.
We use industry-standard tools including Slither, Mythril, Echidna, Foundry fuzzing, and custom tooling. However, automated tools are just the starting point: manual expert review catches the complex vulnerabilities tools miss.
Yes, we offer audit retainers for ongoing security reviews, bug bounty program management, and security consulting. Many clients maintain ongoing relationships for continuous security coverage.
"We at Cashfree were looking for a partner that had the knowledge and capabilities to help us develop a successful Security Token Offering (STO) campaign having in mind the security of our investors, tokens, and investments. Bit Sentinel is for us the main point of contact when we have cybersecurity-related challenges or when we need a better understanding of the inner workings of blockchain technologies."
Peter Op de Beeck
CEO @Cashfree
Web3 security specialists
Our auditors combine deep blockchain expertise with traditional security research
Secure your protocol before attackers find it.
Smart contracts are immutable. Vulnerabilities deployed are vulnerabilities forever. Get expert eyes on your code before you ship to mainnet.