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Security report for clarity-lang.org

Stacks Open Internet Foundation · Technology · United States

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

65/100

Risk levelMedium

0–100, higher is better. How it is calculated

Clarity-lang.org is the official website for the Clarity smart contract language, designed to enable safer and more predictable smart contracts on the Bitcoin blockchain. The project is supported by the Stacks Open Internet Foundation and partners such as Hiro PBC and Algorand, positioning it as a niche but credible player in the blockchain technology sector. The website offers extensive developer resources, documentation, and links to GitHub repositories, targeting blockchain developers and enthusiasts interested in Bitcoin smart contracts. Technically, the site is built using the Tilda CMS platform, hosted via Cloudflare, and employs modern web technologies including JavaScript and jQuery. It demonstrates good mobile optimization and SEO practices but lacks some advanced accessibility features. Security-wise, the site uses HTTPS and avoids exposing sensitive data but lacks explicit security headers and formal privacy or cookie policies, which are areas for improvement. Overall, the domain registration details are consistent with the business entity, enhancing trustworthiness. The site is safe for general audiences and does not contain any adult or questionable content.

Scanned

NIS2 and GDPR posture

GDPR outside view
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. 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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';…

  2. GDPR outside view

    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

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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

Keep watching clarity-lang.org

This scan found 25 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

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

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Results by check

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

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
72
Security headers
30
Email security
75
DNS health
75
Network security
100
GDPR outside view
35
Average
65

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

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

Business context

Business profile

The Clarity language project operates within the blockchain technology industry, focusing on smart contract development for Bitcoin. Its business model revolves around open-source software development and ecosystem support, with revenue likely derived from partnerships and developer engagement. The project benefits from academic design origins and backing by reputable organizations, giving it a competitive advantage in security and predictability of smart contracts. The target market includes blockchain developers and enterprises seeking secure smart contract solutions on Bitcoin. The partnership ecosystem with Stacks, Hiro PBC, and Algorand strengthens its market position and growth potential. The website's professional presentation and resource availability indicate a mature and focused operation.

Security posture

The website exhibits a moderate security posture with HTTPS enabled and no visible exposure of sensitive data. However, the absence of DNSSEC, security headers (such as Content Security Policy, HSTS, X-Frame-Options), and formal security policies reduces its security maturity. No forms collecting sensitive data are present, minimizing attack surface. The lack of incident response contact information and vulnerability disclosure mechanisms suggests limited readiness for security incidents. Compliance with GDPR and other privacy regulations is weak due to missing privacy and cookie policies. Overall, the site is secure for informational purposes but should enhance security controls and compliance documentation to improve trust and resilience.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security and prevent spoofing.
  2. Implement and publish comprehensive privacy and cookie policies to improve GDPR compliance.
  3. Add security headers such as Content Security Policy, HSTS, and X-Frame-Options to enhance browser security.
  4. Provide clear contact information including security incident response channels to improve transparency and readiness.
  5. Consider adding a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stacks Open Internet Foundation
Description
Clarity is a smart contract language designed for Bitcoin, enabling safer, predictable, and secure smart contracts on the Bitcoin blockchain. It is open-source and supported by the Stacks Ecosystem, Hiro PBC, and Algorand.
Key services
Smart contract language development, Documentation and developer resources, Community tools and templates, Integration with Bitcoin blockchain
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, jQuery, Google Fonts (Open Sans), Tilda CMS assets and scripts
Frameworks
Tilda Website Builder
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced (implied by Cloudflare hosting and canonical URL)
  • No exposed sensitive data in HTML
  • No forms detected that collect sensitive data

Analytics and tracking

Services
Fathom Analytics, Plausible Analytics
Tracking level
minimal
Privacy practices
poor

Advertising

Tracking pixels
Fathom Analytics, Plausible Analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed with clear focus on Clarity smart contract language.
  2. No privacy or cookie policies found, indicating compliance gaps.
  3. No contact emails or phone numbers explicitly provided.
  4. Strong presence of developer resources and links to GitHub repositories.
  5. Use of modern analytics tools with minimal tracking.
  6. No security headers detected in HTML content; potential area for improvement.
  7. Domain registration and hosting are consistent and trustworthy.
Technical notes

Notes

The website is built on the Tilda CMS platform, leveraging standard web technologies like HTML5, CSS3, JavaScript, and jQuery. It uses Google Fonts for typography and is hosted on Cloudflare, providing CDN and security benefits. The site loads multiple Tilda-specific scripts for animations, menus, and lazy loading, contributing to a modern user experience. Performance is moderate with good mobile responsiveness and SEO optimization. However, the site lacks advanced accessibility features and security headers, which are technical debts that could be addressed. The use of minimal tracking analytics (Fathom and Plausible) reflects a privacy-conscious approach. Overall, the technical infrastructure is solid but could benefit from security and accessibility enhancements.
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. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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