Terms of Use

These Terms of Use ("Terms") form a binding agreement between you and BlockSign, Inc. ("BlockSign," "we," "us"), a Delaware corporation, governing your use of blocksign.ink, our CLI, our API, and any related services (together, the "Service").

By creating an account, uploading a document, or otherwise using the Service you agree to be bound by these Terms and by our Privacy Policy. If you do not agree, do not use the Service.

If you are using the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms.

• —Document — any file you upload, draft, or reference within the Service for the purpose of signing, notarization, or anchoring.
• —Anchor — the SHA-256 digest of a Document committed to the Solana mainnet via a BlockSign memo transaction.
• —Signed PDF — the rendered output containing your Document, the embedded certificate of signature, and the on-chain Anchor reference.

You retain full ownership of your Documents and Signed PDFs. We do not claim any rights in the contents of files you upload, generate, or sign through the Service.

You grant BlockSign a narrow, non-exclusive, revocable license to host, render, transmit, and hash your Documents solely for the purpose of operating the Service — for example, to generate the certificate of signature, deliver the Signed PDF to recipients you designate, and compute the Anchor published on-chain.

We do not sell your Documents, train models on them, or use them for advertising. The on-chain Anchor is, by design, a one-way hash — it does not reveal Document contents to any third party.

You agree not to use the Service to:

• Upload, sign, or distribute content that is unlawful, infringing, defamatory, or that violates the rights of others.
• Forge identity, impersonate another person, or sign on behalf of someone without their authority.
• Upload malware, exploit code, or content intended to harm the Service, the Solana network, or other users.
• Use the Service for documents that require regulated handling we have not certified — including securities offerings, SEC/FINRA filings, court filings of record, or HIPAA-covered medical records — unless we have agreed in writing to support that workflow.
• Attempt to reverse-engineer protected portions of the Service, circumvent rate limits, or scrape data en masse.
• Use the Service in violation of OFAC, EU, or UK sanctions, or from a jurisdiction we are prohibited from serving.

You also agree to comply with the Solana Foundation's network rules of conduct as they apply to transactions you broadcast through us.

The Service is offered on a Free tier and a paid Pro tier. Solana network fees are passed through at cost — we do not mark them up.

Annual subscriptions may be refunded in full within 14 days of purchase by emailing billing@blocksign.ink. Monthly subscriptions are non-refundable but you may cancel at any time and will retain access through the end of the current billing period.

Solana transaction fees and any network rent we pay on your behalf are non-refundable once a transaction has been broadcast — those tokens have left our control.

When you sign a Document, the resulting Anchor is published to the Solana mainnet. This action is irreversible. We cannot delete, edit, or recall transactions once they are confirmed by validators.

If you delete a Document from your BlockSign account, we remove the file from our storage and our indexes — but the Anchor (a one-way hash) will remain on-chain indefinitely. The Anchor alone does not disclose Document contents.

You acknowledge that the Solana network may be congested, forked, halted, or otherwise impaired by events outside our control, and that the Service depends on network availability.

BlockSign does not provide legal advice. A signature produced by the Service may or may not satisfy the legal formalities required in your jurisdiction for a particular type of document. You are responsible for confirming that an electronic signature is appropriate for your use, and we strongly recommend consulting qualified counsel for high-value or regulated agreements.

To the maximum extent permitted by law, BlockSign's total aggregate liability arising out of or relating to these Terms or the Service is limited to the greater of (a) the fees you paid us in the twelve (12) months preceding the event giving rise to the claim, or (b) USD $100.

In no event will BlockSign, its officers, employees, or affiliates be liable for indirect, incidental, special, consequential, or punitive damages, lost profits, lost goodwill, or loss of data, even if advised of the possibility of such damages.

Some jurisdictions do not allow the exclusion of certain warranties or limitation of certain damages. The above limits apply only to the extent permitted in your jurisdiction.

You may stop using the Service and close your account at any time from your account settings. We may suspend or terminate your access if you materially breach these Terms, if required to comply with law, or if your use poses a security risk to the Service or other users.

Sections that by their nature should survive termination — including ownership, disclaimers, limitation of liability, and governing law — will survive.

These Terms are governed by the laws of the State of Delaware, USA, without regard to conflict-of-laws principles. The federal and state courts located in New Castle County, Delaware will have exclusive jurisdiction over any dispute that is not subject to arbitration.

Any controversy or claim arising out of these Terms will be resolved by binding arbitration administered by JAMS in Wilmington, Delaware, under its Streamlined Arbitration Rules, except that either party may seek injunctive relief in court to protect intellectual property rights.

You and BlockSign agree that disputes will be resolved on an individual basis. Class actions, class arbitrations, and representative actions are not permitted.

We may update these Terms from time to time. When we make a material change we will post the revised version at this URL, update the "Effective" and "Last revised" dates above, and — for substantive changes — notify account holders by email at least 14 days before the change takes effect.

Continued use of the Service after the effective date of a change constitutes acceptance of the updated Terms.

Legal notices, DMCA reports, subpoenas, and similar formal correspondence should be sent to:

• —Email — legal@blocksign.ink(preferred)
• —Mail — BlockSign, Inc., Attn: Legal, 1209 N Orange St, Wilmington, DE 19801, USA
• —Billing — billing@blocksign.ink
• —Security — security@blocksign.ink(PGP available)