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Security report for flashbots.net

Flashbots, Ltd · Technology · N/a

Medium risk. 7 critical or high findings in SSL/TLS, Security headers and 1 other check.

Security score

57/100

Risk levelMedium

Flashbots, Ltd is a specialized research and development organization focused on mitigating the negative externalities of Maximal Extractable Value (MEV) in stateful blockchains, primarily Ethereum. The organization operates at the intersection of blockchain technology, cryptography, and economics, providing open-source infrastructure and research to democratize and distribute MEV fairly. Their market position is strong within the Ethereum ecosystem, supported by a suite of products such as MEV-Boost, BuilderNet, and Rollup-Boost, and a commitment to transparency and community collaboration. Technically, Flashbots employs modern web technologies including Next.js and React for their website, with backend components written in Rust for high-performance block building. They leverage Trusted Execution Environments (TEEs) and maintain a presence on GitHub, ensuring open-source transparency. Hosting is managed via Vercel, providing fast and mobile-optimized user experiences. The website is well-structured, accessible, and SEO-optimized. From a security perspective, the site enforces HTTPS, uses multiple security headers, and avoids exposing sensitive data. However, it lacks published privacy, cookie, and incident response policies, which are areas for improvement. No vulnerabilities or malicious content were detected. The WHOIS data is not publicly available, likely due to privacy protection, but the website's professional nature and community trust signals support its legitimacy. Overall, Flashbots presents a low-risk profile with a strong technical and business foundation. Strategic recommendations include publishing comprehensive privacy and cookie policies, establishing a formal incident response disclosure, and adding a security.txt file to enhance vulnerability reporting and transparency.

Scanned

NIS2 and GDPR posture

GDPR posture
35/ 100 · High
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

7 findings rated critical or high. Fix these first.

  1. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • Critical

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

  2. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  3. GDPR compliance

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

Need hands-on remediation? Email guard@offseq.com

Keep watching flashbots.net

This scan found 21 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Risk score drift

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Results by check

Each check with its score, findings and the evidence it collected.

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Flashbots operates as a key player in the blockchain technology sector, focusing on MEV research and infrastructure. Their business model centers on open-source software development, ecosystem tooling, and research grants, targeting blockchain developers, validators, and DeFi participants. The organization benefits from partnerships with entities like Beaverbuild and Nethermind, enhancing its ecosystem reach. Growth indicators include continuous open-source releases, community engagement via forums and Discord, and pioneering products like MEV-Boost and BuilderNet. Their competitive advantage lies in their early and ongoing commitment to MEV transparency and mitigation, positioning them as thought leaders in blockchain consensus security.

Security posture

Flashbots demonstrates a mature security posture with HTTPS enforcement, robust security headers, and no visible exposure of sensitive data. The open-source nature of their projects adds transparency and community scrutiny, enhancing security trustworthiness. However, the absence of publicly available privacy and cookie policies, incident response plans, and vulnerability disclosure mechanisms represents compliance gaps, particularly under GDPR and similar regulations. The organization should consider formalizing these policies and publishing a security.txt file to improve incident response readiness and user trust. No critical vulnerabilities or security misconfigurations were detected in the website content or infrastructure.

Recommendations

  1. Publish a comprehensive privacy policy and cookie policy with clear consent mechanisms to ensure GDPR and global privacy compliance.
  2. Establish and publicly disclose an incident response policy and security contact channels to enhance transparency and readiness.
  3. Implement and publish a security.txt file to facilitate responsible vulnerability disclosure and improve security posture.
  4. Regularly audit and update security headers and SSL/TLS configurations to maintain best practices.
  5. Enhance user trust by showcasing any relevant certifications or compliance attestations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Flashbots, Ltd
Description
A research and development organization mitigating the negative externalities posed by Maximal Extractable Value (MEV) to stateful blockchains, starting with Ethereum.
Key services
MEV-Boost, BuilderNet, Rollup-Boost, Protect RPC, MEV-Share, Open research and grants
Content quality
excellent
Branding
consistent

Technology

Stack
Next.js, React, Rust (rbuilder), TEEs (Trusted Execution Environments), GitHub-hosted open source, Vercel Analytics
Frameworks
Next.js
Platforms
Ethereum, OP Stack (Optimism)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No exposed sensitive data in HTML
  • Open source transparency

Analytics and tracking

Services
Vercel Analytics
Tracking level
minimal
Privacy compliance
basic

Advertising

Tracking pixels
Vercel Analytics
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is a professional blockchain R&D organization focused on MEV mitigation.
  2. Content is rich, well-structured, and technical.
  3. No privacy or cookie policies found, which is a compliance gap.
  4. No explicit security or incident response policies published.
  5. WHOIS data is unavailable publicly, possibly due to privacy protection.
  6. Strong open source and community trust signals.
  7. No signs of malicious or suspicious content.
Technical notes

Notes

The website is built using modern web technologies including Next.js and React, hosted on Vercel for optimized performance and scalability. The technical infrastructure supports mobile responsiveness, accessibility, and SEO best practices. Backend components related to block building are implemented in Rust, leveraging Trusted Execution Environments for security. The site integrates Vercel Analytics for minimal user tracking. There is no evidence of technical debt or outdated libraries. Opportunities exist to improve compliance-related technical implementations such as cookie consent management and privacy policy integration.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures.

Retrieved 2026-10-25

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