Web3 Security

Secure Your Blockchain & Web3

From smart contract audits to DeFi protocol security, our blockchain security experts help you identify vulnerabilities before attackers do. Protect your users, assets, and reputation in the decentralized world.

Request an Audit Our Methodology
Smart Contract Experts
DeFi Protocol Audits
Pre-Launch & Ongoing
The Web3 Risk Landscape

Why Blockchain Security

The decentralized ecosystem has lost billions to exploits, hacks, and vulnerabilities. Smart contracts are immutable—bugs deployed are bugs forever.

$3.8B
lost to DeFi hacks in 2024
90%
of hacks due to smart contract bugs
47%
of projects had critical vulns
$200M
average bridge hack loss
The Challenge

Security Challenges in Blockchain Development

Building on blockchain introduces unique security challenges that traditional security approaches don't address.

Immutable Deployments

Once deployed, smart contracts can't be patched. Vulnerabilities are permanent unless you've planned for upgrades.

Smart Contracts

High-Value Targets

Protocols holding millions in TVL attract sophisticated attackers with strong financial motivation.

DeFi TVL

Composability Risks

Your protocol interacts with others. A vulnerability in a dependency can cascade into your system.

DeFi Integration

Flash Loan Attacks

Atomic transactions enable attacks impossible in traditional finance—exploiting price oracles and logic flaws.

DeFi MEV

Talent Shortage

Blockchain security expertise is rare. Your dev team may lack the specialized knowledge to identify subtle vulnerabilities.

Team Skills

Time Pressure

Fast-moving markets push for rapid launches. Security often gets compressed or skipped entirely.

Launch Speed

Private Key Management

Admin keys, multisigs, and access controls are common attack vectors. One compromised key can drain everything.

Access Keys

Cross-Chain Complexity

Bridges and multi-chain deployments introduce additional attack surface and synchronization challenges.

Bridges L2

No Recourse

Unlike traditional finance, there's no bank to call. Stolen funds are usually gone forever.

Risk Recovery
Your Advantage

Benefits of Professional

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.

For Development Teams

Detailed findings with code-level remediation

For Founders & Investors

Prevent costly exploits before launch

Build User Trust

A professional audit report signals security-first development to users, investors, and partners.

For Development Teams

Public report demonstrates due diligence

For Founders & Investors

Essential for TVL growth and partnerships

Knowledge Transfer

Our auditors explain findings and best practices, improving your team's security capabilities.

For Development Teams

Learn patterns to avoid in future development

For Founders & Investors

Build internal security competency

Pre-Launch Confidence

Ship with confidence knowing your code has been rigorously tested by specialists.

For Development Teams

Comprehensive coverage before mainnet

For Founders & Investors

Reduce launch-day anxiety and risk

Ongoing Security

Continuous security reviews as your protocol evolves, covering upgrades and new features.

For Development Teams

Catch regressions in code changes

For Founders & Investors

Maintain security posture over time

Independent Validation

Third-party verification that your security claims are backed by rigorous testing.

For Development Teams

Objective assessment from fresh eyes

For Founders & Investors

Credibility for fundraising and listings

Our Services

Blockchain Security Services

Comprehensive security coverage for the entire Web3 ecosystem—from smart contracts to infrastructure.

50+ Audits Completed
$500M+ TVL Secured
🛡️ Zero Post-Audit Hacks

Solidity Audits

Comprehensive review of Ethereum and EVM-compatible smart contracts.

Reentrancy Access control Integer overflow Logic errors Gas optimization

Rust/Solana Audits

Security assessment for Solana programs and Anchor-based protocols.

Account validation PDA security CPI attacks Signer checks Rent exemption

Move/Sui/Aptos

Audits for Move-based blockchains and their unique security model.

Resource safety Module access Capability patterns Object ownership

Formal Verification

Mathematical proofs of correctness for critical contract logic.

Invariant proofs State machine verification Symbolic execution Bounded model checking

All audits include detailed findings reports, remediation guidance, and verification of fixes. Request an audit →

Our Approach

Audit

Our structured approach combines automated tooling with deep manual review to find vulnerabilities other auditors miss.

01
Day 1-2

Scoping & Planning

Define audit scope, gather documentation, and understand your protocol's design intent.

Repository access Documentation review Architecture walkthrough Threat modeling Scope confirmation Timeline agreement
02
Day 2-3

Automated Analysis

Run automated tools to identify common vulnerability patterns and code quality issues.

Static analysis (Slither etc.) Symbolic execution Fuzzing campaigns Gas profiling Test coverage analysis Dependency check
03
Week 1-2

Manual Code Review

Line-by-line expert review focusing on logic, access control, and protocol-specific risks.

Function-level review Business logic validation Access control analysis Edge case identification Composability risks Economic attack vectors
04
Week 2

Findings Documentation

Document all findings with severity ratings, proof-of-concept exploits, and remediation guidance.

Finding write-ups Severity classification PoC development Remediation recommendations Best practice suggestions Draft report
05
Week 2-3

Team Review & Discussion

Walk through findings with your team, answer questions, and discuss remediation approaches.

Findings walkthrough Team Q&A Remediation guidance Prioritization discussion Timeline for fixes Fix verification planning
06
Week 3-4

Fix Verification

Review your fixes to ensure vulnerabilities are properly addressed without introducing new issues.

Fix review Regression testing New code assessment Final report Public report (optional) Post-audit support
What You Receive

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
blockchain-expertise

Platform Screenshot

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Platform Interface

See the Platform in Action

Our auditors have deep expertise across the major blockchain ecosystems and smart contract languages.

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  • Feature item
  • Feature item
  • Feature item
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Common Questions

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—no surprises.
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—you don't wait for the final report. 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.

"The Bit Sentinel team found critical vulnerabilities our internal review completely missed. Their detailed report and remediation guidance helped us fix issues quickly and launch with confidence. The public audit report has been invaluable for building trust with our community."

SD

Protocol Founder

European FinTech

Web3 Security Specialists

Our auditors combine deep blockchain expertise with traditional security research

OSCP OSWE Solidity Expert Rust Security DeFi Researcher

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.

Request an Audit View Our Services