Who We Are
Pioneers in Web3 Security & Development
Our Mission
Protecting Web3 projects by delivering top-tier security audits, innovative testing, and robust development solutions, ensuring trust and safety for users and developers alike.
Our Expertise
Our team combines deep technical expertise with a passion for blockchain innovation. We provide comprehensive services to safeguard your smart contracts and applications.
Our Security Experts
Meet the Team Behind Chain Defenders
0x539.eth
Co-founder & Security Researcher
Web3 security sleuth who thrives on outsmarting blackhat hackers, armed with a knack for spotting critical bugs and a belief that competition among auditors is the secret sauce to a safer decentralized world.
Our Services
Comprehensive Web3 Security & Development Solutions
Pre-Audit Reviews
Thorough initial review of your code to identify potential issues before the formal audit.
Web3 Security Audits
Comprehensive security assessments to ensure your smart contracts are robust and secure.
Web3 Development
Expert development services for building secure Web3 applications and protocols.
Fuzzing & Advanced Testing
Advanced testing techniques to uncover hidden vulnerabilities in your systems.
Trusted By
Industry Leaders Partner With Us
Client Success Stories
What Our Clients Say
Having seen their excellent track record on Code4rena, I engaged their audit service and they delivered exactly as expected. The team provided swift responses with clear findings, demonstrating both technical expertise and professional communication through efficient yet thorough analysis. Their excellent balance of quality and speed makes them particularly recommendable for teams seeking rapid turnaround without compromising on audit quality.
@Zak3939.eth
Phi
This is probably one of the best findings on this competition that we got till now. Their attention to detail and deep understanding of smart contract vulnerabilities really shone through, helping us secure our platform effectively.
@0xpedro_eth
Zaros
Our experience with Chain Defenders was smooth from start to finish. They provided a good service, delivering a comprehensive review and valuable recommendations in a timely manner. Their communication style and collaborative approach was very effective. We appreciated their attention to detail and would do business again.
@agfviggiano
Size Credit
Working with Chain Defenders was a fantastic experience. They were extremely thorough and delivered an amazing audit on a strict time schedule. They helped us better understand our contracts and the implications of each function. I'll definitely be coming back to them in the future.
@0xmalcolmm
The Blackhole Experiment
Very readable and clear findings were provided. Some were duplicated but useful nonetheless. Thank you.
@alexroan
Cyfrin
Having seen their excellent track record on Code4rena, I engaged their audit service and they delivered exactly as expected. The team provided swift responses with clear findings, demonstrating both technical expertise and professional communication through efficient yet thorough analysis. Their excellent balance of quality and speed makes them particularly recommendable for teams seeking rapid turnaround without compromising on audit quality.
@Zak3939.eth
Phi
This is probably one of the best findings on this competition that we got till now. Their attention to detail and deep understanding of smart contract vulnerabilities really shone through, helping us secure our platform effectively.
@0xpedro_eth
Zaros
Our experience with Chain Defenders was smooth from start to finish. They provided a good service, delivering a comprehensive review and valuable recommendations in a timely manner. Their communication style and collaborative approach was very effective. We appreciated their attention to detail and would do business again.
@agfviggiano
Size Credit
Working with Chain Defenders was a fantastic experience. They were extremely thorough and delivered an amazing audit on a strict time schedule. They helped us better understand our contracts and the implications of each function. I'll definitely be coming back to them in the future.
@0xmalcolmm
The Blackhole Experiment
Very readable and clear findings were provided. Some were duplicated but useful nonetheless. Thank you.
@alexroan
Cyfrin
Having seen their excellent track record on Code4rena, I engaged their audit service and they delivered exactly as expected. The team provided swift responses with clear findings, demonstrating both technical expertise and professional communication through efficient yet thorough analysis. Their excellent balance of quality and speed makes them particularly recommendable for teams seeking rapid turnaround without compromising on audit quality.
@Zak3939.eth
Phi
This is probably one of the best findings on this competition that we got till now. Their attention to detail and deep understanding of smart contract vulnerabilities really shone through, helping us secure our platform effectively.
@0xpedro_eth
Zaros
Our experience with Chain Defenders was smooth from start to finish. They provided a good service, delivering a comprehensive review and valuable recommendations in a timely manner. Their communication style and collaborative approach was very effective. We appreciated their attention to detail and would do business again.
@agfviggiano
Size Credit
Working with Chain Defenders was a fantastic experience. They were extremely thorough and delivered an amazing audit on a strict time schedule. They helped us better understand our contracts and the implications of each function. I'll definitely be coming back to them in the future.
@0xmalcolmm
The Blackhole Experiment
Very readable and clear findings were provided. Some were duplicated but useful nonetheless. Thank you.
@alexroan
Cyfrin
Having seen their excellent track record on Code4rena, I engaged their audit service and they delivered exactly as expected. The team provided swift responses with clear findings, demonstrating both technical expertise and professional communication through efficient yet thorough analysis. Their excellent balance of quality and speed makes them particularly recommendable for teams seeking rapid turnaround without compromising on audit quality.
@Zak3939.eth
Phi
This is probably one of the best findings on this competition that we got till now. Their attention to detail and deep understanding of smart contract vulnerabilities really shone through, helping us secure our platform effectively.
@0xpedro_eth
Zaros
Our experience with Chain Defenders was smooth from start to finish. They provided a good service, delivering a comprehensive review and valuable recommendations in a timely manner. Their communication style and collaborative approach was very effective. We appreciated their attention to detail and would do business again.
@agfviggiano
Size Credit
Working with Chain Defenders was a fantastic experience. They were extremely thorough and delivered an amazing audit on a strict time schedule. They helped us better understand our contracts and the implications of each function. I'll definitely be coming back to them in the future.
@0xmalcolmm
The Blackhole Experiment
Very readable and clear findings were provided. Some were duplicated but useful nonetheless. Thank you.
@alexroan
Cyfrin