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About BlockchainSign
What is BlockchainSign?
BlockchainSign is a blockchain timestamping service that helps you protect your intellectual property by creating a permanent, verifiable record of when you had a file or piece of information. It computes a SHA-256 hash of your file in your browser, records it on the Ethereum blockchain, and generates a lifetime certificate of the timestamp.
What problem does it solve?
In disputes over copyright, trade secrets, or prior use rights, the key question is always: who had it first? Traditional methods like copyright registration or notarization are slow and costly. BlockchainSign provides a fast, affordable way to fix the date of your work without revealing its contents or relying on a trusted third party.
Who is it for?
BlockchainSign is ideal for freelancers, startups, and small businesses who need to prove the originality of their work before pitching, signing NDAs, or deciding on a patent. It's not for those who need legally binding registration or a notary’s seal—it's a complementary tool for establishing a prior date.
Real use cases
Photographers timestamp their shots, developers protect their code, and writers secure their manuscripts—all before sharing or publishing. The service lets you record what you sent and when, giving you solid evidence in case of infringement.
Key features
- File never uploaded — Your file stays in your browser; only its SHA-256 hash is processed.
- Ethereum blockchain record — Your timestamp is permanently stored on Ethereum, verifiable by anyone.
- Verifiable without us — The certificate points to a public transaction with the hash embedded in readable text.
- No subscription — Buy a certificate only when you need it, no monthly fees.
- Web Crypto API — High-security hashing done client-side.
- Lifetime certificate — Receive a permanent proof of your data's timestamp.
SaaSpartout Score
6.9
/10
Editorial score from our review methodology — not user ratings.
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BlockchainSign Pricing
BlockchainSign pricing: Pay per certificate.
Pay-as-you-go
BlockchainSign has no subscription; you purchase a certificate when needed. The exact price depends on current Ethereum network fees, but there are no recurring costs. Free tool to compute the hash and verify certificates.
Frequently asked questions
Is BlockchainSign free?
No, but it has no subscription. You pay per certificate, which includes the Ethereum transaction fee. You can use the hash tool and verify certificates for free.
How much does BlockchainSign cost?
The cost varies with network congestion, but you only pay when you want a certificate. There are no monthly fees.
Who is BlockchainSign best for?
It's best for creators, freelancers, and startups who need quick, low-cost proof of creation date for copyright, trade secrets, or prior use rights before sharing work.
What are top alternatives to BlockchainSign?
Alternatives include other blockchain timestamping services like OriginStamp, Certiledger, and Proof of Existence, though each has its own pricing and features.
How does BlockchainSign work?
You upload a file in your browser, the tool computes its SHA-256 hash, records it on Ethereum, and you get a certificate with the transaction details.
What is a key limitation of BlockchainSign?
It only proves existence at a point in time, not authorship. It doesn't replace copyright registration or legal advice, and its cost depends on Ethereum network fees.
