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BlockchainSign
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Protect your work. Prove your document creation with blockchain timestamping.

Our blockchain-based trusted timestamping service is a secure, tamper-proof way to verify the existence and integrity of any digital asset (contracts, media, intellectual property, source code) at a specific point in time.

Get startedSee how it works
  • Your file never leaves your browser
  • Recorded on Ethereum
  • Lifetime certificate
Blockchain timestamping and digital notary service on Ethereum
1

Submit your file or information

Provide any file, or type in the information you want to timestamp.

2

Blockchain record created

We generate a unique hash of your data and record it permanently on the blockchain.

3

Receive a lifetime certificate

Get a tamper-proof certificate with everything needed to prove your data’s authenticity.

How it works

Three steps, a few minutes, and permanent proof.

1. Submit your file or information

Provide any file or information you want to timestamp. We never see your file — only its SHA-256 hash, computed in your browser.

2. We record it on the blockchain

We create a permanent blockchain record of your data using its unique hash.

3. Receive a lifetime certificate

You get a certificate containing everything needed to securely prove the timestamp of your data.

More details

Why blockchain timestamping

No authority to trust, nothing to renew, nothing that can be altered.

Trusted

You no longer depend on a trusted timestamp authority. The record lives on a distributed blockchain network, free from control and manipulation.

Secure

Once a timestamp is recorded, blockchain technology ensures nobody can change it — including us.

Easy

No special software and no cryptocurrency. A few clicks and your data is timestamped.

Frequently asked questions

Do you keep my files on your side?
No. We never have access to your file. The hash is calculated directly in your browser, and no metadata is stored on our side.
Do I need cryptocurrency to use the service?
No. You can pay by credit card or PayPal, and we handle the blockchain transaction for you.
What will I get?
A lifetime certificate containing everything needed to prove a timestamp — your data and the hash stored on the blockchain. Note that a certificate proves the time of the blockchain record, not the file’s creation time, so it proves the file existed before that moment.
How is the information stored? Can anyone access my information?
Your information stays private. Only a hash of your file is stored on the blockchain. You prove the timestamp by presenting the certificate, which holds all the necessary information.
How can I check the blockchain record?
We send you a link to your blockchain transaction, also included in your certificate, along with instructions for verifying and proving your timestamp independently, without using our service.
Can I prove a timestamp if your service closes?
Yes. Your certificate contains everything needed to prove your data via the blockchain, entirely independently of us.
What happens if I lose or modify the file?
If you lose the original file or the certificate, or you modify the file’s content — which changes its hash — you will not be able to prove the timestamp. Keep both safe and untouched.
What blockchain do you use?
We use Ethereum, one of the most popular and reliable blockchains available.
What kind of files can I use?
Any type of file. To submit several files, compress them into a single archive. Submitting a file is optional — you can timestamp text information alone.

Pricing

Buy the certificates you need. No subscription, no renewal.

1 certificate

$9.99

$9.99 per certificate

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Most popular

10 certificates

$29.99

$2.99 per certificate

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100 certificates

$99.99

$0.99 per certificate

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Pay by card

No cryptocurrency needed. We handle the blockchain transaction for you.

Prove it on the blockchain

Timestamp any file and get a tamper-proof, lifetime certificate that it existed today. Your file never leaves your browser.

Get started