“Which notice was live when they consented?”
Record each version of your privacy notice or policy as it is approved or published.
vDPO Proof
Prove exactly what existed, and when.
Record a digital fingerprint of any file on a public blockchain. Anyone can verify it later, for free.
Use it for confidential information under an NDA, the privacy notice you published, an incident report or an approved assessment: any record you may one day need to prove has not changed.
Your file never leaves your device. Only its digital fingerprint is recorded.
What a proof shows
WHAT
The exact file, identified by its digital fingerprint (SHA-256 hash).
WHENThe file existed no later than the time it was recorded on the Blockchain.
UNCHANGEDAny later copy can be checked: even a one-character change gives a different fingerprint.
When it matters
The moments you will need it
Disputes, audits and investigations often turn on one question: what exactly existed at the time?
01 · NDAs
02 · Privacy notices
03 · Breaches and incidents
04 · Assessments
05 · Vendors
06 · Code and research
“What exactly was confidential?”
Fingerprint the confidential information and quote the fingerprint in the NDA. If there is a dispute, the file can be matched to the record.
How it works for NDAs →“When did you know, and what did you report?”
Record incident reports, notifications and remediation evidence as they are created.
“Was this approved before launch?”
Record impact assessments, risk assessments, approvals and audit workpapers.
“What did the vendor agree to?”
Record due diligence, instructions and contract schedules shared with Data Processors.
“Did we have this first?”
Record source code releases, datasets, models and research files without publishing them.
What you get
Sample confidential information (PDF)A certificate anyone can check
Every proof comes with a certificate showing the digital fingerprint (SHA-256 hash), the time it was recorded on the Arc Blockchain, and a QR code that opens the public record.
Sample non-disclosure agreement (PDF)
Sample PROOF certificate (PDF)
How it works
How it works
Choose the file
Your browser creates its digital fingerprint (SHA-256 hash). The file itself is not uploaded.
Record it on the Arc Blockchain
vDPO records the fingerprint on the Arc Blockchain, a public record that cannot be quietly edited.
Keep the evidence
Download the certificate and keep it with the original, unchanged file.
Verify at any time
Anyone with the original file can recreate the fingerprint and match it to the public record.
Pricing
Pay per proof
Each proof uses one proof credit. If the same file has already been recorded, you get the existing record and your credit back. Credits are valid for 3 years from purchase.
Single proof
₹499 ₹499 per proofOne NDA or one document
Buy 1 credit10 proofs
₹3,999 ₹400 per proofA few NDAs or policies a year
Buy 10 credits50 proofs
₹14,999 ₹300 per proofPrivacy or legal teams
Buy 50 credits200 proofs
₹44,999 ₹225 per proofCompliance departments and law firms
Buy 200 credits1,000 proofs
₹1,50,000 ₹150 per proofEnterprises
Buy 1,000 creditsDiscounted pricing is available for lawyers, chartered accountants (CAs), company secretaries and other professionals using vDPO Proof for their clients. Email team@vdpo.org for details.
Why it holds up
Evidence that does not depend on us
What a proof shows
- The exact file, by its digital fingerprint.
- That the file existed at the recorded time.
- Whether a later copy is identical, down to the last byte.
- A public record anyone can check, even if vDPO stops operating.
What it does not show
- Who created or owns the file.
- That the content is true or accurate.
A vDPO Proof is supporting evidence for an electronic record. It is strongest alongside the original file, the certificate and records showing how the file was created and kept. Take legal advice on how to rely on it in a dispute.
Blockchain evidence and the law
How courts and laws treat it
Courts look at how a record was created, kept and verified, not just at the blockchain. A proof is strongest as part of a documented process.
Bharatiya Sakshya Adhiniyam, 2023
Section 61 gives electronic and digital records the same legal effect, validity and enforceability as other documents, subject to section 63.
Section 63 governs the admissibility of electronic records and requires a certificate in applicable cases. The prescribed certificate asks for the hash value of the electronic record, so a digital fingerprint fits directly into how electronic evidence is presented in India.
A vDPO Proof does not replace the section 63 certificate where one is required. It supports it, by showing that the record's hash existed at a recorded time.
Hangzhou Huatai v Shenzhen Daotong (2018)
The Hangzhou Internet Court accepted blockchain-preserved evidence of an infringing webpage after examining its source, how it was collected and stored, and how it could be verified.
Lesson: blockchain is a strong integrity layer when the capture process is documented.
Vermont blockchain evidence law
Vermont law allows qualifying blockchain records to be self-authenticating when its requirements are met, with presumptions about authenticity and the time of recording.
It does not make the contents of a record true or legally valid.
eIDAS electronic timestamps
An electronic timestamp cannot be denied legal effect or admissibility solely because it is electronic. Qualified timestamps receive stronger presumptions about time and integrity.
Federal rules of evidence
Blockchain records can be presented under existing rules on electronic evidence and authentication, supported by evidence about the process used, certifications or expert testimony.
This is general information, not legal advice. How a proof is treated depends on the court, the law that applies and the facts of the case.
Questions
FAQs
Is my file uploaded?
No. The fingerprint is created in your browser and only the fingerprint is recorded.
Can anyone see my file from the record?
No. A digital fingerprint cannot be turned back into the file. The record shows only the fingerprint and the time.
What if I edit the file later?
Any change, even re-saving a Word document, produces a different fingerprint and will not match. Keep the exact file you recorded. For documents you will keep editing, record a PDF or a zip file and keep that copy unchanged.
What if vDPO stops operating?
The record stays on the public Arc Blockchain. Using the details on your certificate, anyone can recreate the fingerprint from the original file and check it independently.
Does it prove I own the content?
No. It proves the content existed by the recorded time and has not changed since. Ownership has to be shown by other evidence, such as contracts or creation records.
vDPO Proof