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BlockchainSign

Terms & conditions

Last updated 14 August 2026

These terms are a contract between you and the operator of BlockchainSign. Please read them before you buy or use anything. Section 10 (blockchain records are public and permanent) and section 19 (limitation of liability) matter most.

TABLE OF CONTENTS

1. AGREEMENT TO THESE TERMS

These Terms and Conditions (the “Terms”) form a legally binding agreement between you, whether personally or on behalf of an entity (“you”), and P/E Aleksei Khaliapin (“Company”, “we”, “us”, or “our”). They cover the website at https://blockchainsign.io, the application at https://app.blockchainsign.io, and the timestamping service delivered through them (together, the “Service”).

By creating an account, buying certificates, or otherwise using the Service, you confirm that you have read and accepted these Terms. If you do not accept them, do not use the Service.

If you are entering into these Terms on behalf of a company or other organisation, you confirm that you have authority to bind it, and “you” means that organisation.

The Service is offered worldwide, but it is not directed at any person in a jurisdiction where offering or using it would be unlawful. If you access the Service from such a place, you do so on your own initiative and are responsible for compliance with local law.

The Service is not built to meet the requirements of sector-specific regimes such as HIPAA, FISMA or the Gramm-Leach-Bliley Act. Do not use it for data that is subject to those rules.

2. WHO WE ARE

The Service is operated by P/E Aleksei Khaliapin, an individual entrepreneur registered in Georgia, with registered address at street 07, house N07, Varkhani, Adigeni region 0305, Georgia. State registration number: [to be completed].

You can reach us at [email protected]. Email is our support channel, and we answer there.

3. THE SERVICE

BlockchainSign records proof that a file existed at a given moment. It works like this:

Your browser computes the SHA-256 hash of the file you select, using the Web Crypto API. The file itself is never uploaded. There is no endpoint on our side that accepts file contents, and you can confirm this in your browser’s network tab.

You supply the hash (or hashes), a short description that you want recorded alongside them, and optionally an email address. We assemble these into a certificate payload, compute the SHA-256 hash of that payload, and write that single hash into the data field of an Ethereum transaction. If a file is too large or too confidential to open in your browser, you can compute its SHA-256 yourself and paste the fingerprint in instead.

Once the transaction is confirmed, you receive a certificate file containing the payload, the payload hash, the transaction hash, and a link to the transaction on a public block explorer. Anyone holding the certificate can reproduce the same hashes and check the transaction on the Ethereum network, with or without us.

One certificate may cover up to ten files, and costs one certificate credit regardless of how many it covers.

4. WHAT A CERTIFICATE PROVES

A certificate proves that the exact bytes of your file, and the description you supplied, existed no later than the moment the Ethereum transaction was mined. Any change to the file, however small, produces a different hash and breaks the match.

A certificate does not prove any of the following: that you are the author or owner of the file; that the file is original, lawful, or free of third-party rights; that the file did not exist earlier; or that the content of the file is true.

Timestamping is not registration and is not legal advice. A certificate is not a copyright registration, a trademark registration, a patent filing, a notarial act, or a qualified electronic signature under eIDAS, the ESIGN Act, or any similar law. It does not replace registration with any national office, and it does not by itself establish any legal right. Our website, guides and blog are general information, not legal advice. Whether and how a certificate helps in a dispute is for a court or authority to decide under the law that applies to you. If the matter is important, consult a qualified lawyer in your jurisdiction.

5. ELIGIBILITY AND YOUR ACCOUNT

You must be at least 18 years old to use the Service.

Accounts are created and secured through our authentication provider, Clerk. You are responsible for keeping your credentials confidential and for everything done through your account. Tell us promptly at [email protected] if you believe your account has been used without your permission.

You agree that the information you give us, including your email address, is accurate and current. If information you provide is untrue or incomplete, we may suspend or close your account.

6. CERTIFICATES, PACKAGES AND EXPIRY

There is no subscription. Nothing renews automatically and there is nothing to cancel. You buy certificate credits in one-off packages, and you spend one credit each time you create a certificate.

Credits are added to your account once your payment is confirmed by the payment provider. If a certificate cannot be created for technical reasons, the credit is returned to your account unused.

A certificate you have created never expires. The blockchain record, the certificate file, and its verification link are permanent and stay valid indefinitely.

Unused credits expire twelve (12) months after the date of the purchase that granted them. Each package runs its own twelve-month term. Credits left unspent at the end of that term can no longer be used and are not refundable. This applies only to unused credits; it never affects certificates you have already created.

7. PRICES AND PAYMENT

Prices are shown on the pricing page and are quoted in US dollars. The price charged is the one displayed at checkout.

Checkout is handled by our payment provider, currently Creem (creem.io); we also use Stripe as an alternative provider. Payment is by card, and the provider may offer further methods such as wallet payments. We never receive or store your full card number — it goes directly to the provider, which is PCI DSS compliant. Where the provider acts as merchant of record for a sale, your receipt and any tax invoice come from them, and they account for applicable VAT or sales tax. [Confirm before publishing: whether Creem is merchant of record on your account.]

Any taxes, duties, bank charges, or currency conversion fees applied by your bank or card issuer are yours to pay. We are not responsible for them.

We may change prices at any time. A price change never affects a purchase already completed. We may correct pricing errors and may decline any order, and if we decline one after payment we refund it in full.

8. REFUNDS AND RIGHT OF WITHDRAWAL

Our Refund policy forms part of these Terms. In summary:

Unused credits can be refunded on request. Write to [email protected] from the address on your account and tell us which purchase you mean.

A credit that has been spent on a certificate cannot be refunded once the Ethereum transaction has been broadcast, because at that point the work is done and the cost is irreversible. If a transaction fails, no credit is consumed.

Consumers in the EU, EEA and UK: you have fourteen (14) days from your purchase to withdraw from it without giving a reason. By asking us to create a certificate during that period, you expressly request that we begin performance immediately and acknowledge that you lose the right of withdrawal for that certificate once its blockchain transaction has been broadcast. Your fourteen-day right continues to apply to credits you have not yet spent. To withdraw, email [email protected].

Refunds are issued to the original payment method. Please allow up to twenty business days for a refund to appear on your statement, depending on your bank.

9. YOUR CONTENT

You keep all rights in your files and in everything you enter into the Service. We claim no ownership of them.

You confirm that you have the right to timestamp what you timestamp, and that doing so does not infringe anyone’s rights or break any law.

Two kinds of text you enter are treated differently, and the difference matters:

The certificate description becomes part of the certificate payload. Its hash goes on the public blockchain, and the text itself appears in the certificate file that you download and may share. Do not put anything confidential in it.

Your email address is optional. If you give one, it is written into the payload in plain text, so whoever you show the certificate to also sees it, and it cannot be changed afterwards without invalidating the certificate. Leave the field empty and no address is written into the payload at all.

The name and notes you can attach to an order in your dashboard are private labels for your own filing. They stay in our database, are never sent to the timestamping service, and never reach the payload, the certificate, or the chain.

We grant ourselves no licence to publish, sell, or reuse your content. We use it only to operate the Service, as described in the Privacy policy.

10. BLOCKCHAIN RECORDS ARE PUBLIC AND PERMANENT

Please read this section carefully, because it describes something we cannot undo.

An Ethereum transaction is public, permanent, and outside anyone’s control once broadcast. The hash of your certificate payload therefore cannot be edited, hidden, or deleted by us, by you, or by anyone else. It stays readable on the public chain for as long as the network exists. Closing your account, deleting your data, or exercising a right of erasure cannot remove it.

What goes on the chain is only the SHA-256 hash of the payload. Your file, its contents, your description, and your email address are not written to the chain. A hash cannot be reversed into the data it came from. But note that if someone already holds a copy of the exact file, they can compute its hash and confirm it matches your certificate.

Verification depends on public infrastructure we do not run — the Ethereum network itself and third-party block explorers. We cannot guarantee their availability, and we are not responsible for network conditions such as congestion, fee spikes, or chain reorganisations. We do not issue, hold, or trade cryptocurrency on your behalf; we pay the network fee ourselves out of the price you have already paid.

11. ACCEPTABLE USE

Commercial use is welcome. You may use the Service for business purposes, including timestamping commercial documents, and you may resell or pass on certificates you have created to your own clients.

You agree not to:

use the Service to timestamp material that is unlawful, or to further fraud, forgery, or any attempt to mislead a court, authority, or counterparty about the provenance of a file;

present a certificate as something it is not, for example as a copyright registration, a notarial act, or a qualified electronic signature;

interfere with the Service or the networks behind it, probe or bypass its security or rate limits, or try to gain access to accounts, data, or systems that are not yours;

copy, adapt, decompile, or reverse engineer any part of the Service, except to the extent the law permits despite this restriction;

scrape or systematically extract content from the Service, or use automated means to create accounts or orders, except through an interface we provide for that purpose;

impersonate anyone, or use another person’s email address, payment method, or identity;

resell or rebrand the Service itself as your own product without a written agreement with us; or

use the Service in a way that breaks any law that applies to you.

12. INTELLECTUAL PROPERTY

The Service, including its software, design, text, graphics, and the BlockchainSign name and logo, belongs to us or to our licensors and is protected by copyright, trademark, and other laws. Nothing in these Terms transfers any of it to you.

We grant you a limited, personal, non-exclusive, non-transferable, revocable licence to use the Service and to view and print its content for your own purposes, subject to these Terms. Certificates you create are yours: you may keep, copy, publish, and share them freely.

All rights we have not expressly granted are reserved.

13. FEEDBACK

If you send us ideas, suggestions, or feedback about the Service, we may use them for any purpose without obligation or payment to you. Please do not send us anything you consider confidential or want to be paid for.

14. AFFILIATE PROGRAM

We run an affiliate program through Creem. Tracking, attribution, and payouts are handled on Creem’s platform, and joining it means accepting Creem’s affiliate terms in addition to these Terms.

Commission is a share of each qualifying payment made by a customer you referred, at the rate and within the attribution window stated on our Affiliate page. Commission is payable only on payments that are actually received and not refunded or charged back; a refunded sale reverses the commission on it.

You may not earn commission on your own purchases or on purchases by anyone acting for you. You may not bid on our brand name in paid search, send unsolicited bulk email, use misleading claims about what a certificate does, or promote the Service on sites that infringe rights or break the law. We may withhold commission and end your participation if you break these rules, and we may change or close the program at any time, with commission already earned on completed, non-refunded sales still payable.

The Service relies on third parties, including Clerk for accounts, Creem and Stripe for payments, and the Ethereum network and public block explorers for the record itself. Your use of those services is also governed by their own terms and policies. We are not responsible for their acts or omissions, but we remain responsible to you for the Service under these Terms.

Our site may link to other websites. We do not control them, do not endorse them, and are not responsible for their content or practices. Follow such links at your own risk.

16. AVAILABILITY AND WHAT SURVIVES

We aim to keep the Service available, but we do not promise it will be uninterrupted or error-free. We may need to suspend it for maintenance, and we may change, add, or remove features.

If we ever discontinue the Service, the certificates you already hold keep working. That is by design: the Ethereum record is independent of us, and the certificate file contains everything a third party needs to verify it without our participation. We will give you reasonable notice before shutting the Service down so that you can download your certificates and your order history, and we will publish the steps for verifying a certificate independently.

Because certificates are meant to be kept for years, please store your own copy of every certificate file. Do not rely on your dashboard as your only copy.

17. TERM AND TERMINATION

These Terms apply for as long as you use the Service.

You may stop using the Service and ask us to close your account at any time by emailing [email protected].

We may suspend or close your account if you materially break these Terms, if we are required to by law, or if your use exposes us or others to a real risk of harm or liability. Except where it would be unlawful or impractical, we will tell you why and give you a chance to put things right. If we close your account for a reason other than your breach, we refund any unused, unexpired credits.

Closing your account does not affect certificates already created. The blockchain record and your certificate files remain valid and verifiable.

18. DISCLAIMERS

Except as these Terms expressly state, and to the fullest extent the law allows, the Service is provided “as is” and “as available”, and we disclaim all warranties, express or implied, including implied warranties of merchantability, fitness for a particular purpose, and non-infringement.

In particular, we do not warrant that the Service will meet your requirements, that it will be available without interruption, that it will produce any particular legal outcome, or that any court, office, or counterparty will accept a certificate as evidence.

If you are a consumer, nothing here removes the rights your local law gives you and does not allow us to exclude.

19. LIMITATION OF LIABILITY

To the fullest extent permitted by law, we are not liable for indirect, incidental, special, consequential, or punitive damages, or for lost profits, lost revenue, lost business, lost opportunity, or loss of or damage to data, arising out of or relating to the Service, even if we were told such damage was possible.

Our total liability to you for all claims arising out of or relating to the Service, whatever the legal basis, is limited to the greater of the amount you paid us in the twelve (12) months before the event giving rise to the claim, or USD 100.

Nothing in these Terms limits our liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or for anything else that cannot be limited under the law that applies to you. Some jurisdictions do not allow certain exclusions or limitations, in which case those parts do not apply to you and you may have additional rights.

20. INDEMNITY

If you use the Service for business purposes, you agree to defend, indemnify, and hold us harmless from any third-party claim, loss, liability, and reasonable legal costs arising from your use of the Service, your breach of these Terms, or your infringement of anyone’s rights. We will tell you promptly about any such claim and will not settle it without your consent, which you will not unreasonably withhold. This section does not apply to consumers.

21. PRIVACY

Our Privacy policy explains what we collect, why, who processes it for us, how long we keep it, and what rights you have. It forms part of these Terms.

Note in particular that we process and store data in Georgia and with providers located elsewhere, and that the blockchain record described in section 10 cannot be erased. The Privacy policy sets out the safeguards that apply to international transfers.

22. ELECTRONIC COMMUNICATIONS AND SIGNATURES

You agree that we may communicate with you electronically, and that agreements, notices, and records we provide electronically satisfy any legal requirement that they be in writing. You accept that clicking to agree, or continuing to use the Service, has the same effect as a signature, to the extent the law allows. This does not affect any right you have to receive information on a durable medium.

23. GOVERNING LAW AND DISPUTES

These Terms are governed by the law of Georgia, without regard to its conflict-of-law rules.

Talk to us first. If something goes wrong, email [email protected] with a description of the problem and what you would like us to do. Most issues are settled this way. Both of us agree to try to resolve any dispute informally for thirty (30) days from the date written notice is given, before starting proceedings.

If that fails, the courts of Georgia have jurisdiction over any dispute arising out of these Terms or the Service.

If you are a consumer, this does not deprive you of the protection of the mandatory law of the country where you live, and you may bring proceedings in the courts of that country. You may also be able to use a local out-of-court dispute resolution body.

To the extent permitted by law, disputes will be resolved individually. Neither of us may bring a claim as part of a class or representative action.

24. CHANGES TO THESE TERMS

We may update these Terms as the Service changes or the law requires. We will update the “Last updated” date at the top, and if a change materially affects your rights we will give you reasonable advance notice by email or in the app before it takes effect.

The version in force when you make a purchase governs that purchase. Continuing to use the Service after a change takes effect means you accept the updated Terms. If you do not accept them, stop using the Service and ask us for a refund of any unused, unexpired credits.

25. MISCELLANEOUS

These Terms, together with the Privacy policy and the Refund policy, are the entire agreement between you and us about the Service, and replace any earlier version.

If a provision is found unlawful or unenforceable, it is severed and the rest stays in force. Our failure to enforce a provision is not a waiver of it. We are not liable for failures caused by events beyond our reasonable control. We may transfer our rights and obligations under these Terms to another party, provided your rights are not reduced; you may not transfer yours without our written consent. Nothing here creates a partnership, joint venture, employment, or agency relationship between us. There are no third-party beneficiaries.

26. CONTACT US

For questions about these Terms, support, refunds, or complaints, write to:

[email protected]

P/E Aleksei Khaliapin
street 07, house N07, Varkhani
Adigeni region 0305, Georgia