
OriginStamp
ScoreDetect
Woleet
Stampery
Bitstamped
Certificado
Proof of existence
Timestamp any document on Ethereum and get a certificate anyone can verify. The file is hashed in your browser and never uploaded — only the SHA-256 hash is recorded. No subscription and no crypto wallet.

Managed Hosting for developers, entrepreneurs, and businesses like yours

Website, pricing, platforms and company facts side by side.
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| Website | blockchainsign.io | opalstack.com |
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In their own words, as submitted to SaaSHub.


BlockchainSign is a blockchain timestamping service for people holding documents they cannot hand over. Conventional options all require custody: a copyright office wants a deposit copy, a notary wants to see the paper, an e-signature platform wants the file on its servers. BlockchainSign never...
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What each product offers, as listed by its team.


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When comparing BlockchainSign and Opalstack, you can also consider the following products.

Blockchain-based, tamper-proof timestamping. Data Integrity as a Service.
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ScoreDetect is an innovative platform that serves as a permanence layer for data provenance, enabling systems and authorities to independently verify data authenticity.
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Blockchain timestamping and certification Software as a Service , SaaS.
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Stampery generates legally binding proofs of existence, integrity and ownership.
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Issue blockchain-powered certificates for any type of data
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