Home › Terms of Service

Terms of Service

Last updated: April 2026

These Terms of Service (“Terms”) govern your use of trycairn.app and the Cairn browser extension (collectively, the “Service”) operated by Cairn (“we”, “us”, or “our”). By using the Service, you agree to these Terms.

1. Description of Service

Cairn is a proof-of-ownership service that allows you to anchor a cryptographic hash of a file to the Base blockchain. We provide a browser extension for anchoring files, a web interface for viewing proof records, and a credit-based system for purchasing anchors.

Anchoring a file creates a permanent, publicly visible record on the Base blockchain containing your wallet address, the file's hash, and a timestamp. This record cannot be altered or deleted.

2. Eligibility

You must be at least 18 years old to use the Service. By using the Service, you represent that you meet this requirement.

3. Your Account

You authenticate using a blockchain wallet via Privy. You are responsible for maintaining the security of your wallet. We are not responsible for any loss resulting from unauthorised access to your wallet.

4. Credits and Payments

  • Anchoring a file consumes one credit from your balance.
  • Additional credits may be purchased through the Service via Stripe.
  • Credits are non-transferable and have no cash value.
  • All purchases are final. We do not offer refunds on consumed credits.
  • Unused credits may be eligible for a refund at our discretion if you contact us within 30 days of purchase. To request a refund for unconsumed credits, contact [email protected].
  • We reserve the right to change credit pricing at any time. Price changes will not affect credits already purchased.

5. Acceptable Use

You agree not to use the Service to:

  • Anchor content that infringes the intellectual property rights of others.
  • Anchor content that is illegal, harmful, or abusive.
  • Attempt to circumvent, reverse engineer, or interfere with the Service.
  • Use the Service in any automated or bulk manner without our written permission.
  • Misrepresent your ownership of a file or use the Service to create fraudulent proof records.

6. Intellectual Property

The Cairn name, logo, and web application are our intellectual property. The browser extension source may be made available under a separate open source licence — refer to the extension's repository for details.

You retain all ownership of the files you anchor. Anchoring a file does not transfer any rights to us.

7. Blockchain Records

You understand and acknowledge that:

  • Transactions submitted to the Base blockchain are permanent and cannot be reversed, altered, or deleted by us or anyone else.
  • Your wallet address and file hash will be publicly visible on the blockchain.
  • We are not responsible for any consequences arising from the public visibility of your on-chain records.
  • We cannot guarantee the availability or performance of the Base blockchain or any third-party RPC provider.

8. Service Availability

We aim to keep the Service available but do not guarantee uninterrupted access. We may suspend or discontinue the Service at any time. If we discontinue the Service, we will provide reasonable notice and offer refunds for unconsumed credits where practicable. Your on-chain proof records will remain accessible on the blockchain regardless of the Service's availability.

9. Disclaimer of Warranties

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. WE DISCLAIM ALL WARRANTIES INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE ERROR-FREE OR THAT ANY PARTICULAR FILE ANCHOR WILL BE SUCCESSFULLY SUBMITTED TO THE BLOCKCHAIN.

10. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, WE SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, DATA, OR GOODWILL, ARISING FROM YOUR USE OF THE SERVICE. OUR TOTAL LIABILITY TO YOU SHALL NOT EXCEED THE AMOUNT YOU PAID TO US IN THE 12 MONTHS PRECEDING THE CLAIM.

11. Changes to Terms

We may update these Terms from time to time. We will post the updated Terms with a revised date. Continued use of the Service after changes constitutes your acceptance of the updated Terms. For material changes, we will make reasonable efforts to notify you.

12. Governing Law

These Terms are governed by the laws of Texas, United States, without regard to conflict of law principles.

13. Contact

For questions about these Terms, contact us at: [email protected]