Proof of Existence with Certain Date
Prove that any document existed at a specific moment in time. Immutable, instant, and verifiable by anyone.
How It Works
Select File
Upload any file. It never leaves your device.
Generate Hash
We calculate the SHA-256 locally. A unique fingerprint.
Record on Kaspa
The hash is sealed on the blockchain in ~1 second.
Get Certificate
Download your PDF with all verification details.
Why Certify with Proovik?
Instant
Kaspa confirms transactions in ~1 second. No waiting hours or days.
Immutable
Once recorded, the data cannot be modified or deleted. Ever.
Private
Your document never leaves your device. We only process the hash.
Global
No borders. Anyone in the world can verify your certificate.
Affordable
From $0.01 per certification. Much cheaper than a traditional notary.
Eternal
The blockchain is permanent. Your proof will exist as long as Kaspa exists.
Use Cases
Certification is useful for...
Intellectual Property
Protect code, designs, music, videos, and creative works.
Contracts
Seal agreements, NDAs, and commercial contracts with certain date.
Compliance
Prove regulatory compliance and deadlines with auditable records.
Research
Establish priority of discoveries and protect research data.
Legal Evidence
Create technical evidence for disputes and legal procedures.
Personal Documents
Protect wills, medical records, and important certificates.
Frequently Asked Questions
Proovik certifies the existence of digital content (files, documents, images, etc.) at a specific point in time. We do NOT verify the content, authorship, or legality of the document. We only prove that a specific file existed at a given moment.
No. Your file never leaves your device. We calculate the SHA-256 hash locally in your browser and only that hash (a 64-character string) is sent to be recorded on the blockchain. It is mathematically impossible to reconstruct the original file from the hash.
Blockchain certification provides technical evidence that can be used as proof in many contexts. However, legal validity varies by jurisdiction. We recommend consulting a lawyer for specific cases. Proovik does not replace a public notary.
Kaspa is a new generation blockchain that uses BlockDAG technology. This allows it to confirm transactions in approximately 1 second with final confirmation, unlike other blockchains that can take minutes or hours.
Any type of digital file: PDF, DOCX, images (JPG, PNG), videos (MP4), code, ZIP files, etc. There is no file type restriction since we only process the hash.
Ready to certify your documents?
Start now with a free certification. No registration required.
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