Confidential meetings.
Protected and verifiable.
More than an NDA. A verifiable confidentiality protocol.
C-NDA Protocol™ connects confidentiality agreements, verified identity, controlled access and blockchain-anchored evidence in one traceable process. For confidential meetings and documents.
Verify a certificate
Enter the code: existence, integrity and blockchain anchor. No account, no need to trust us.
Confidentiality becomes verifiable.
C-NDA Protocol™ connects confidentiality agreements, verified identity, controlled access and evidence in one traceable, verifiable protocol.
Agreement before access
Confidentiality is accepted before a scheduled meeting's link is revealed or protected content is shared.
Identity linked to the evidence
Each acceptance is associated with a verified identity and the relevant events in the process.
Evidence collected in one flow
Agreement, access events, timestamps and metadata are brought together in one verifiable evidence package.
Verifiable integrity over time
Evidence is cryptographically sealed and anchored on blockchain so its integrity can be independently verified.
Confidentiality becomes verifiable evidence.
From the link to the evidence. One connected process.
C-NDA guides the process before, during and after the meeting: identity, agreement, access, evidence and verification.
Phase 01: Before
Enter the protected process
Receive the dedicated C-NDA link for the meeting or document.
Verify your identity and sign
Confirm your identity, accept the confidentiality agreement and complete the access process.
Phase 02: During
Join the meeting
Enter the protected meeting while the system collects the evidence defined by the protocol.
Phase 03: After
Receive the evidence package
The evidence is collected into a traceable package, sealed and anchored on blockchain.
Verify it later
Check the certificate and the integrity of the evidence whenever needed.
Know who entered. Know what they accepted. Know what you can verify later.
C-NDA connects identity, agreement, access and evidence in one verifiable flow.
Control before access
Confidentiality is accepted before a scheduled meeting or protected content becomes accessible.
Evidence throughout the process
Identity, acceptance, access events, timestamps and relevant metadata are linked into one coherent evidence trail.
Verification afterwards
The evidence can later be checked through the certificate, hash and blockchain anchor.
The evidence that remains.
C-NDA brings the relevant evidence from the process into one verifiable dossier, linked to a certificate and a blockchain-anchored fingerprint.
Who accepted
Verified identity, date and time, identification method and agreement acceptance.
What happened
Access events, relevant meeting or document events, timestamps and process metadata.
How you verify it
The certificate, cryptographic fingerprint and blockchain reference allow the integrity and consistency of the evidence to be checked.
One evidence trail. Reviewable and verifiable over time.
You can verify it. Even without trusting us.
C-NDA makes evidence integrity verifiable through a cryptographic fingerprint anchored on blockchain, without publishing confidential content.
Evidence stays private
Only the cryptographic fingerprint is anchored on blockchain, not documents, names or confidential content.
Every change becomes detectable
If the package changes, its fingerprint changes too. Its integrity can therefore be checked over time.
Verification is independent
The certificate and blockchain reference allow the evidence to be checked against what was originally sealed.
Verification does not depend on a promise. It depends on the evidence.
Meetings and documents
Meetings
Schedule a protected Google Meet: participants accept before the link is revealed, and a visible C-NDA witness joins the call. Already in a call? The C-NDA button inside Meet protects the session from that moment on.
Google Meet, early access. Microsoft Teams and Zoom are coming.
Hosts use a Chrome extension or the macOS app; participants install nothing.
Documents
Send an NDA to one or more parties. Each one verifies their identity and accepts; you receive the certificate before you share what is confidential.
Real product screenshots.
Where confidential information changes hands
Founders and startups →
Pitches, demos and early partner talks.
Inventors and R&D teams →
Technical disclosures before a filing or a joint project.
Consultants and agencies →
Client workshops, strategy and creative work shared before contract.
Legal teams and law firms →
NDAs with an evidence trail their clients can verify.
Investors and deal rooms
Due-diligence calls and data shared during a deal.
Procurement and compliance
Supplier briefings where confidentiality must be demonstrable.
Security, stated plainly
Data in the EU
Stored in the EU, encrypted at rest.
The meeting link is encrypted
It is never sent to a browser before acceptance.
Identity methods named in full
On every certificate, never as a score or a level.
What we do not claim
No certification badges we do not hold. The details are on our security page.
A patented system
The method behind C-NDA, binding the parties before access and turning the session into anchored evidence, is a patented system developed by WitUp Ltd.
Questions
What is C-NDA Protocol™?
A verifiable confidentiality protocol. It links identity, the NDA, access, evidence and blockchain anchoring in one fixed sequence, and produces a certificate anyone can check.
What does C-NDA protect?
Confidential information shared in two settings: documents and other material you disclose after an NDA, and online meetings on Google Meet, in early access. Microsoft Teams and Zoom are coming.
How does it work for a meeting?
You schedule a Google Meet through C-NDA and invite the participants. Each one verifies their identity and accepts the NDA before the link is revealed; a visible C-NDA witness joins the call, and the session evidence is sealed and anchored after it ends.
How does it work for a document?
You send an NDA to one or more parties. Each one verifies their identity and accepts; the acceptances are sealed into a certificate anchored on blockchain, which you have before you share the confidential material.
What is stored on the blockchain?
Only the cryptographic fingerprint of the evidence package, through blockchain anchoring. No names, no documents, no meeting content.
Does confidential information end up on the blockchain?
No. Only a cryptographic fingerprint is anchored. Documents, names and meeting content stay off-chain, and the fingerprint reveals nothing about them.
What is an evidence package?
The set of original records behind a certificate: NDA terms, each party's identification and acceptance, and, for meetings, the event log, recording fingerprint and transcript. You download it as a ZIP alongside the PDF.
How can a C-NDA certificate be verified?
Enter the certificate code on the verification page, no account needed. Or recompute the fingerprint of the evidence package yourself and compare it with the blockchain anchor.
Is C-NDA an e-signature tool?
No. Signing is one step. C-NDA also ties access to acceptance, records what happens and makes the record verifiable by third parties.
Does blockchain make an NDA legally valid?
No. Enforceability depends on the agreement and on the applicable law. The blockchain lets anyone check that the evidence has not changed and when it was sealed.
Make confidentiality verifiable.
The Free plan includes two document protections a month, each with a certificate you can verify later.
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