Blockchain Penetration Testing Services: Fortify Your Web3 Ecosystem
Don't let a single vulnerability compromise your entire project.
Our elite ethical hackers simulate real-world attacks to secure your smart contracts, dApps, and network infrastructure.






Your Innovation is Only as Strong as Its Weakest Link
In the Web3 space, a single security oversight can lead to catastrophic losses, eroding user trust and jeopardizing your entire project. Standard security audits are essential, but they're not enough. They examine your code in isolation. We test your entire, live ecosystem against the sophisticated, multi-pronged attacks it will face in the wild. We don't just check for bugs; we simulate a full-scale assault to uncover systemic vulnerabilities before malicious actors do.
Why Partner with Errna for Blockchain Security?
We provide more than a vulnerability report. We deliver the strategic intelligence and technical fortitude you need to build, launch, and scale with confidence.
The Hacker's Mindset
Our certified ethical hackers don't just follow a checklist. They think like your adversaries, using creativity and deep platform knowledge to uncover complex attack vectors that automated tools and standard audits miss.
Beyond Smart Contracts
A secure contract on an insecure network is a liability. We go deeper, testing your entire stack: nodes, APIs, consensus mechanisms, wallet integrations, and off-chain components for a holistic security posture.
Investor-Grade Reporting
Receive comprehensive, actionable reports that not only guide your developers in remediation but also provide the third-party validation needed to secure funding, partnerships, and user trust.
AI-Augmented, Human-Driven
We leverage advanced AI tools for broad-spectrum analysis and fuzzing, but our strength lies in our experts' manual verification and exploitation attempts, ensuring zero false positives and uncovering nuanced logic flaws.
Certified & Compliant
With CMMI Level 5, ISO 27001, and SOC 2 certifications, our processes are verifiable and mature. We deliver security with the discipline and documentation that enterprise clients and regulators demand.
An Extension of Your Team
We work collaboratively with your development team, providing clear communication, detailed remediation guidance, and re-testing to ensure vulnerabilities are fully patched, not just identified.
End-to-End DevSecOps
Security isn't a one-time event. We help you integrate continuous penetration testing into your CI/CD pipeline, making security an integral part of your development lifecycle from day one.
Cross-Chain Expertise
Whether you're building on Ethereum, Solana, Polkadot, or a private Hyperledger network, our team possesses the specialized expertise to test the unique security models of various blockchain architectures.
20+ Years of Trust
Since 2003, we've been the trusted technology partner for startups and Fortune 500 companies. We bring decades of enterprise-level security experience to the cutting edge of Web3.
Our Comprehensive Penetration Testing Services
We offer a full suite of security testing services tailored to the unique challenges of decentralized applications and blockchain networks.
Smart Contract Penetration Testing
We go beyond static analysis to dynamically test your smart contracts for common and novel vulnerabilities. Our goal is to ensure your on-chain logic is immutable, tamper-proof, and free from exploitable flaws that could lead to fund drainage or unauthorized state changes.
- Identify re-entrancy, integer overflow/underflow, and unchecked external calls.
- Test for business logic flaws and economic exploits unique to your protocol.
- Provide gas optimization analysis and best practice recommendations.
Wallet & Key Management Security
The most secure blockchain is useless if user wallets are compromised. We test your wallet applications (web, mobile, browser extension) and key management systems to ensure private keys remain private and user funds are protected from client-side attacks.
- Assess secure storage, key generation, and transaction signing processes.
- Test for vulnerabilities like phishing, injection, and insecure data handling.
- Review seed phrase recovery mechanisms and multi-signature implementations.
Full dApp Security Assessment
We evaluate your entire decentralized application, including front-end interfaces, back-end services, and their interactions with the blockchain. This holistic view uncovers vulnerabilities that arise from the complex interplay between on-chain and off-chain components.
- Analyze front-end for vulnerabilities like Cross-Site Scripting (XSS) that can trick users.
- Test API security and access controls for off-chain services.
- Ensure data integrity and privacy between the user interface and smart contracts.
Oracle & Off-Chain Data Integration Testing
If your dApp relies on external data, the oracle is a critical point of failure. We simulate attacks on your oracle mechanism to test its resilience against manipulation, ensuring the data feeding your smart contracts is reliable and secure.
- Test for data source spoofing and man-in-the-middle attacks.
- Assess the security of oracle node operators and data aggregation logic.
- Evaluate fallback mechanisms in case of oracle failure or corruption.
Blockchain Network & Node Infrastructure Testing
For private or consortium chains, the security of the underlying network is paramount. We test your node configurations, peer-to-peer communication, and overall network topology to protect against denial-of-service, eclipse attacks, and other network-level threats.
- Perform vulnerability scanning and hardening of validator and full nodes.
- Test P2P message propagation and transaction pool security.
- Assess defenses against Sybil attacks and network partitioning.
Consensus Mechanism Security Analysis
The heart of any blockchain is its consensus algorithm. We analyze your specific implementation (PoW, PoS, PBFT, etc.) for theoretical and practical weaknesses that could be exploited to compromise the integrity of the ledger.
- Evaluate resistance to long-range attacks and nothing-at-stake problems.
- Assess validator/miner collusion risks and incentive structures.
- Review the security of staking, slashing, and governance mechanisms.
51% & Economic Attack Simulation
We model and simulate sophisticated economic attacks, including 51% attacks (for PoW chains) and governance takeovers. This helps you understand the real-world cost and feasibility of such attacks, allowing you to implement effective economic and technical deterrents.
- Calculate the theoretical cost of attack and identify potential weak points.
- Test the network's response to chain reorganizations and forks.
- Assess the security of governance protocols against hostile token accumulation.
Threat Modeling & Security Architecture Review
Before a single line of code is tested, we help you build security in from the start. Our experts work with your team to identify potential threats, design secure architecture, and create a robust security roadmap for your entire project lifecycle.
- Develop a comprehensive threat model using frameworks like STRIDE.
- Review architectural designs for single points of failure and security flaws.
- Provide strategic guidance on building a resilient and defensible Web3 platform.
Our Penetration Testing Methodology
Our structured, multi-phase approach ensures comprehensive coverage and delivers actionable insights, moving from broad reconnaissance to targeted exploitation and detailed reporting.
1. Scoping & Reconnaissance
We collaborate with you to define the scope, objectives, and rules of engagement. Our team then gathers intelligence on your architecture, technology stack, and potential attack surfaces.
2. Threat Modeling & Vulnerability Analysis
We map out potential threats and identify likely vulnerabilities using a combination of automated scanning, source code review (if available), and manual analysis of your system's logic and architecture.
3. Controlled Exploitation
This is where our ethical hackers attempt to exploit the identified vulnerabilities in a safe, controlled environment. We prove the real-world risk without causing disruption to your operations.
4. Reporting & Remediation
We deliver a detailed report classifying vulnerabilities by severity, outlining the steps to reproduce them, and providing clear, actionable guidance for your development team to patch the issues.
5. Re-testing & Verification
After your team has implemented the fixes, we perform re-testing to verify that the vulnerabilities have been successfully remediated and that the patches have not introduced new security flaws.
Technologies & Tools We Master
Our expertise spans the full spectrum of the Web3 ecosystem, from core blockchain protocols to the tools used for development and security analysis.
Our Track Record of Success
We've helped leading Web3 projects secure their platforms, protect user assets, and launch with confidence. Explore our impact.
The Challenge: Ensuring Protocol Solvency Under Attack
The client was preparing for a mainnet launch and needed assurance that their complex system of smart contracts, oracles, and liquidation mechanisms was secure against sophisticated economic exploits that could drain the protocol's liquidity pools.
Key Challenges:
- Complex cross-chain asset bridging logic.
- Reliance on multiple, third-party price oracles.
- Novel tokenomics and governance models.
- Immense pressure to launch quickly without compromising security.
Our Solution: A Multi-Layered Offensive Security Assessment
We conducted a comprehensive penetration test that simulated various real-world attack scenarios:
- Economic Exploit Simulation: We modeled and executed flash loan attacks and oracle manipulation scenarios to test the resilience of their liquidation engine.
- Smart Contract Testing: Deep manual analysis of their Solidity code to uncover re-entrancy, access control, and business logic vulnerabilities.
- Infrastructure Hardening: We assessed the security of their validator nodes and off-chain keeper bots responsible for triggering liquidations.
- Governance Attack Path Mapping: We analyzed their governance module for potential hostile takeover vectors.
The Challenge: Protecting User Assets and Preventing Fraud
The client needed to ensure their marketplace was safe from threats that could lead to stolen NFTs, fraudulent listings, or manipulation of auction mechanics, which would destroy their brand reputation in the competitive gaming space.
Key Challenges:
- Complex royalty and bidding logic in smart contracts.
- Integration with multiple third-party wallet providers.
- High risk of front-end attacks (phishing, XSS) targeting users.
- Ensuring integrity of off-chain metadata associated with NFTs.
Our Solution: Full-Stack dApp Penetration Test
Our assessment covered every component of the marketplace ecosystem:
- Front-End Security Review: We tested the web application for vulnerabilities that could compromise user sessions or trick them into signing malicious transactions.
- Auction Contract Exploitation: We attempted to manipulate bidding, bypass royalty payments, and mint unauthorized NFTs by exploiting flaws in the contract logic.
- API Security Testing: We assessed the security of the APIs connecting the front-end to their off-chain services and IPFS for metadata storage.
- Wallet Interaction Analysis: We analyzed how the dApp interacted with wallets to ensure it followed best practices and couldn't be used to drain user funds.
The Challenge: Securing a Permissioned Enterprise Network
The client's goal was to ensure the integrity and confidentiality of sensitive supply chain data on their private blockchain. They needed to verify that only authorized participants could write data and that the network was resilient to attacks from both internal and external threats.
Key Challenges:
- Complex access control logic and participant permissions.
- Ensuring data privacy between competing participants on the same network.
- Hardening the physical and virtual infrastructure of the nodes.
- Validating the security of the chaincode (smart contracts).
Our Solution: Enterprise Blockchain Infrastructure Pen Test
We focused on the unique security concerns of a permissioned DLT environment:
- Node & CA Penetration Testing: We attempted to compromise the peer nodes and Certificate Authorities to gain unauthorized access to the network.
- Access Control & Privacy Testing: We simulated a malicious participant attempting to access or modify data they were not authorized to see, testing the channel and private data collection configurations.
- Chaincode Security Review: We analyzed their Go-based chaincode for vulnerabilities that could lead to improper state transitions or data leakage.
- Network Topology Analysis: We assessed the network for single points of failure and vulnerabilities to denial-of-service attacks.
Industries We Serve
Our blockchain security expertise is trusted by innovators across a wide range of industries building the future of Web3.
FinTech & DeFi
Securing exchanges, lending protocols, wallets, and asset tokenization platforms.
Gaming & Metaverse
Protecting NFT marketplaces, play-to-earn economies, and digital asset ownership.
Supply Chain & Logistics
Ensuring data integrity and access control in traceability and provenance solutions.
Healthcare
Securing patient data, clinical trial records, and pharmaceutical supply chains.
Real Estate
Validating platforms for fractional ownership, tokenized assets, and title management.
Government & Public Sector
Hardening systems for digital identity, voting, and secure record-keeping.
What Our Clients Say
Meet Our Security Experts
Our team is composed of industry veterans, certified ethical hackers, and blockchain protocol specialists dedicated to securing the decentralized web.

Joseph A.
Expert Cybersecurity & Software Engineering, specializing in threat modeling and secure architecture for large-scale distributed systems.

Vikas J.
Divisional Manager, Certified Expert Ethical Hacker (CEH), specializing in network penetration testing and cloud security for blockchain infrastructure.

Akeel Q.
Manager, Certified AI & Machine Learning Specialist, focuses on AI-driven fuzzing and vulnerability detection in complex smart contracts.

Prachi D.
Manager, Certified Cloud & IoT Solutions Expert, with deep expertise in securing oracles and off-chain data feeds for hybrid dApps.
Flexible Engagement Models
We offer a range of engagement models to fit your project's lifecycle, budget, and security needs.
One-Time Project Assessment
Ideal for pre-launch audits, third-party validation, or annual security check-ups.
- Defined scope and fixed timeline.
- Comprehensive report and remediation support.
- Perfect for securing investor confidence.
Continuous Testing (DevSecOps)
Best for active development projects that need ongoing security integration.
- Integrates security into your CI/CD pipeline.
- Regular, automated, and manual testing.
- Helps catch vulnerabilities as they are introduced.
Retainer-Based Security Partnership
Your on-demand security team for strategic guidance and emergency response.
- A dedicated block of expert hours per month.
- Priority access to our security engineers.
- Covers testing, consulting, and incident response.
Frequently Asked Questions
A smart contract audit is a static analysis of your code, focusing on finding bugs and vulnerabilities within the contract itself. Penetration testing is a dynamic, holistic assessment. We simulate real-world attacks on your entire live or staging ecosystem—including your dApp front-end, APIs, nodes, and user interactions—to find vulnerabilities that only emerge when all components work together. An audit checks the blueprint; a pen test tries to break into the finished building.
The duration depends on the complexity and scope of your project. A focused smart contract test might take 1-2 weeks. A full-stack dApp and network assessment could range from 3 to 6 weeks. We provide a detailed timeline after our initial scoping call.
For safety and to avoid disruption, the majority of our aggressive testing is performed on a testnet or a dedicated staging environment that is an exact replica of your production setup. We can perform limited, non-disruptive testing on the mainnet, but any potentially service-impacting tests are strictly confined to non-production environments.
You will receive a comprehensive final report that includes an executive summary of the business risks, detailed technical findings for each vulnerability (including severity rating, impact, and steps to reproduce), and clear, actionable recommendations for remediation. We also provide a debriefing call with your technical team to walk through the findings and answer any questions.
While our primary role is to identify and report vulnerabilities, we provide detailed guidance and best-practice examples to assist your development team in patching the issues effectively. For clients who need hands-on development support, we can scope a separate engagement with our expert blockchain development team to implement the fixes.
The cost is based on the scope and complexity of the engagement. Factors include the number of smart contracts, the size of the codebase, and the components included in the test (dApp, network, APIs, etc.). We provide a custom quote after a free, no-obligation scoping call where we discuss your specific needs. Investing in a thorough pen test is significantly less expensive than the potential cost of an exploit.
Ready to Fortify Your Place in Web3?
A single vulnerability can undo years of innovation. Don't leave your project's security to chance. Schedule a free, confidential consultation with our security experts to discuss your project and get a custom penetration testing proposal.
Request a Free Consultation