Privacy Policy

Last updated: January 4, 2026

At Fairseq, we take your privacy seriously. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our products and services.

1. Information We Collect

1.1 Information You Provide

When you create an account or use our Services, you may provide us with:

  • Account information: name, email address, password
  • Profile information: company name, job title
  • Payment information: billing address, payment card details (processed by Stripe)
  • Communications: feedback, support requests, correspondence with us

1.2 Information Collected Automatically

When you use our Services, we automatically collect:

  • Usage data: API calls, proof generation requests, feature usage
  • Device information: browser type, operating system, device identifiers
  • Log data: IP address, access times, pages viewed, referring URLs
  • Performance data: error logs, response times, system performance metrics

1.3 Transaction Data

When you submit transactions for proof generation, we process:

  • Transaction hashes and ordering information
  • Proof generation metadata
  • Lighthouse epoch anchoring data

We do not store the content of your transactions; only the cryptographic representations necessary to generate and verify proofs.

2. How We Use Your Information

We use the information we collect to:

  • Provide, maintain, and improve our Services
  • Process transactions and send related information
  • Send technical notices, updates, and support messages
  • Respond to your comments, questions, and requests
  • Monitor and analyze usage trends and preferences
  • Detect, investigate, and prevent fraudulent or unauthorized activity
  • Comply with legal obligations

3. Information Sharing

We do not sell your personal information. We may share information in the following circumstances:

  • Service providers: Third parties that help us operate our Services (hosting, payment processing, analytics)
  • Legal requirements: When required by law or to protect our rights and safety
  • Business transfers: In connection with a merger, acquisition, or sale of assets
  • With your consent: When you explicitly authorize us to share

4. Data Security

We implement appropriate technical and organizational measures to protect your information, including:

  • Encryption in transit (TLS) and at rest
  • Access controls and authentication mechanisms
  • Regular security assessments and monitoring
  • Employee training on data protection

However, no method of transmission over the Internet is 100% secure, and we cannot guarantee absolute security.

5. Data Retention

We retain your information for as long as your account is active or as needed to provide Services. We may retain certain information as required by law or for legitimate business purposes, including:

  • Account information: Until account deletion plus 30 days
  • Proof data: 90 days after generation (configurable for Enterprise)
  • Usage logs: 12 months
  • Billing records: 7 years (legal requirement)

6. Your Rights and Choices

Depending on your location, you may have certain rights regarding your personal information:

  • Access: Request a copy of the personal information we hold about you
  • Correction: Request correction of inaccurate or incomplete information
  • Deletion: Request deletion of your personal information
  • Portability: Request a copy of your data in a portable format
  • Objection: Object to certain processing of your information
  • Restriction: Request restriction of processing in certain circumstances

To exercise these rights, contact us at privacy@fairseq.io. We will respond to your request within 30 days.

7. International Data Transfers

We process and store information in the United States. If you are located outside the United States, your information may be transferred to and processed in a country with different data protection laws. We implement appropriate safeguards for such transfers, including Standard Contractual Clauses approved by the European Commission.

8. Children's Privacy

Our Services are not directed to children under 16. We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us immediately.

9. California Privacy Rights

California residents have additional rights under the California Consumer Privacy Act (CCPA), including:

  • Right to know what personal information is collected
  • Right to know if personal information is sold or disclosed
  • Right to say no to the sale of personal information
  • Right to equal service and price

We do not sell personal information as defined by the CCPA.

10. European Privacy Rights (GDPR)

If you are located in the European Economic Area (EEA), United Kingdom, or Switzerland, we process your personal data based on:

  • Performance of our contract with you (providing Services)
  • Your consent (where specifically requested)
  • Our legitimate interests (improving Services, security)
  • Compliance with legal obligations

You may lodge a complaint with your local data protection authority if you believe we have not complied with applicable data protection laws.

11. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of material changes by posting a notice on our website or sending you an email. Your continued use of the Services after such notice constitutes acceptance of the updated policy.

12. Contact Us

If you have questions about this Privacy Policy or our data practices, please contact us at:

Fairseq
Email: privacy@fairseq.io
Website: https://fairseq.io