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Security report for blockchair.com

Blockchair · Technology · N/a

Partial score · DNS & email only

61/100

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

Blockchair is a well-established blockchain explorer and API provider founded in 2016. It offers comprehensive blockchain data services across numerous blockchains including Bitcoin, Ethereum, Cardano, and many others. The platform targets blockchain users, developers, and analysts seeking detailed blockchain data and analytics. The website demonstrates a professional and consistent brand presence with excellent content quality and user experience. Technically, it employs modern JavaScript frameworks such as Livewire and Alpine.js, uses WebSockets for real-time data, and maintains good performance and mobile optimization. Security-wise, the site uses HTTPS and includes CSRF tokens, but lacks DNSSEC and explicit security headers, and does not publicly disclose privacy or security policies. Overall, the domain registration is consistent and legitimate, supporting the business credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
58/ 100 · Medium
Checks completed
6of 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

3 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. GDPR outside view

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

    • 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 blockchair.com

This scan found 15 issues across 5 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
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Full report

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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
0
Email security
70
DNS health
75
Network security
100
GDPR outside view
58
Average
61

Not counted

  • Security headers: did not complete in this scan.
  • 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

Blockchair holds a strong market position as a leading blockchain explorer and API service, supporting a wide range of blockchains and offering additional products like a news aggregator and curated crypto product listings. Its business model revolves around providing blockchain data access and analytics to a technical audience. The company benefits from a medium-sized operation with a long domain history, consistent branding, and a clear focus on blockchain technology. The absence of explicit contact information and privacy policies suggests areas for improvement in transparency and compliance. The platform integrates with multiple external domains for assets and streaming but does not show partnerships or subsidiaries in the provided data.

Security posture

The website demonstrates a moderate security posture with HTTPS enabled and domain status set to clientTransferProhibited, which helps prevent unauthorized domain transfers. The presence of CSRF tokens indicates attention to form security. However, the lack of DNSSEC, security.txt, vulnerability disclosure, and explicit security headers such as Content-Security-Policy or X-Frame-Options reduces the overall security maturity. No vulnerabilities or exposed sensitive data were detected in the analyzed content. Incident response and security policy information are not publicly available, which could hinder rapid response to security incidents. Privacy compliance is weak due to missing privacy and cookie policies.

Recommendations

  1. Enable DNSSEC to enhance domain security and prevent DNS spoofing.
  2. Implement and publish comprehensive privacy and cookie policies with GDPR compliance and consent mechanisms.
  3. Add security headers like Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to improve browser security.
  4. Publish a security policy and incident response contact information to improve transparency and readiness.
  5. Provide clear contact information including company emails and phone numbers to enhance trust and compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Blockchair
Description
Unlock the power of blockchain with Blockchair’s top explorer and API—search, sort, and filter blocks, transactions, and addresses effortlessly.
Key services
Blockchain explorer, API access to blockchain data, News aggregator, Crypto product listings
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Livewire, Alpine.js, WebSockets
Frameworks
Livewire
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enabled
  • ClientTransferProhibited domain status
  • CSRF token present in meta tags

Analytics and tracking

Services
Matomo (indicated by _paq array usage)
Tracking level
moderate
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is a comprehensive blockchain explorer supporting multiple blockchains.
  2. No visible privacy or cookie policies found on the homepage HTML.
  3. No contact emails or phone numbers explicitly found in the provided content.
  4. Strong use of modern web technologies and structured data.
  5. No security.txt or vulnerability disclosure information detected.
  6. No explicit security headers detected in the provided data.
  7. No advertising or affiliate marketing detected in the HTML content.
  8. Social media presence indicated by Twitter handle @Blockchair in meta tags.
Technical notes

Notes

The website uses a modern tech stack including Livewire and Alpine.js for reactive UI components, and WebSockets for real-time data streaming. It loads CSS and JS assets from a dedicated subdomain (loutre.blockchair.io) and uses a CDN for performance. The site is mobile optimized and accessible with good SEO practices including meta tags, Open Graph, and JSON-LD structured data. Hosting and DNS are managed via NameCheap and cloudns.net respectively. Performance is fast with preloading of critical assets. There is no detected CMS, indicating a custom or bespoke platform. Technical risks include missing DNSSEC and lack of some security headers, which could be addressed to reduce attack surface.
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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