What We Audit for Blockchain Security
We safeguard the core of Web3. This includes the main blockchain layers, custom virtual machines, and the whole wallet ecosystem.
Establish the audit scope based on the finalized codebase and design documents. We'll prepare a detailed quote that shows the complexity and needs of your project. If needed, we can sign a non-disclosure agreement (NDA) to protect sensitive information.
Define Scope & Provide Estimate
Establish the audit scope based on the finalized codebase and design documents. We'll prepare a detailed quote that shows the complexity and needs of your project. If needed, we can sign a non-disclosure agreement (NDA) to protect sensitive information.
Agreement Confirmation & Timeline Setup
Confirm the project terms, including payment details. Also, set a clear timeline for the audit with specific start and end dates.
Security Review & Remediation Evaluation
Conduct a complete security assessment with our in-house tools. These tools can be customized if needed. The findings will be shared with the client, followed by discussions on the fixes. For bigger or more complex projects, we might need several review rounds. This helps make sure all issues are fixed.
Final Report & Actionable Recommendations
Please submit a signed report. It should include all findings, risk assessments, and detailed suggestions for fixing issues. Make sure to provide clear action steps for any vulnerabilities found.
Blockchain Security Audit Advantages
We use our own testing frameworks along with deep architectural insights. This helps strengthen the stability and security of your blockchain ecosystem.
Audit Reports
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Hear from Our Customers
“We had a great experience working with BlockSec on the security testing of Mega-EVM, our stateless validator, and the SALT data structure. They're responsive, diligent, and easy to collaborate with, with a fast feedback loop throughout the audit. Their deep expertise across both smart contracts and node-level systems made them a strong partner for complex infrastructure work.”
“On the audit side, the BlockSec team has left a very positive impression on us. Their audits are never a mere formality; instead, they dive deep into contract implementation details and specific business logic, covering edge cases and extreme scenarios that are often overlooked. The entire process was smooth and highly efficient. Their bug localization and remediation advice were clear and actionable, helping us significantly reduce potential security risks before product launch.”
“BlockSec has built a strong reputation for conducting highly technical audits for blockchains and smart contracts. Supporting Solidity (EVM-compatible ecosystems), Rust (NEAR & Solana), and Go (Cosmos), the company primarily relies on thorough manual reviews, enhanced by automated differential fuzzing tools and static analyzers. This approach allows BlockSec to identify deep logic flaws in code and provide actionable recommendations to ensure project security before launch.”
“BlockSec's deep expertise in smart contract security has been invaluable to exSat. Their rigorous audits consistently uncover subtle yet critical vulnerabilities, delivering clear, practical remediations. With their meticulous, code-level scrutiny, we gain unparalleled confidence in our protocol's integrity—making BlockSec our trusted partner for secure, resilient smart contracts.”
Why Organizations Choose BlockSec
Total System Protection
We audit your entire project stack, from smart contracts and blockchain code to wallets and off-chain websites.
Focus on Business Logic
We make sure your project's economic rules and money flows make sense, protecting you from logic flaws, not just coding errors.
Math-Based Security
We use mathematical proofs (Formal Verification) to guarantee that the most critical parts of your code simply cannot fail.
Clear & Actionable Reports
Our reports don't just list problems; they explain exactly what wrong is and give you simple, step-by-step instructions to fix them.
Frequently Asked Questions
Top 10 "Awesome" Security Incidents in 2025
To help the community learn from what happened, BlockSec selected ten incidents that stood out most this year. These cases were chosen not only for the scale of loss, but also for the distinct techniques involved, the unexpected twists in execution, and the new or underexplored attack surfaces they revealed.
Newsletter - December 2025
In December 2025, the DeFi sector encountered three significant security incidents, resulting in total losses of approximately $19.7 million. Yearn Finance faced nearly $10 million in losses due to vulnerabilities in its yETH pool and legacy contracts. Trust Wallet suffered a malicious backdoor attack on its Chrome extension, leading to losses of about $7 million. Ribbon Finance experienced a loss of $2.7 million due to improper access controls.
Web3 Smart Contract & EVM Chain Audits | BlockSec
BlockSec secures Web3 with attacker-driven audits, chain reviews, and zero-day detection - battle-tested, blocking 20+ hacks and $20M+ losses.
