Who it is for
Writers, photographers, and other creators who want a timestamped record of authorship.
ProofX
Cryptographic proof of authorship for written work
Overview
What ProofX does
ProofX, from CyberSec AI Ltd, registers a piece of writing and returns cryptographic evidence that it existed in that exact form. Articles, poems, scripts, and source code are named in the record as material it will sign.
Three lookups run alongside registration: checking whether a given content ID or hash is on file, opening a creator profile with the history of what that person has registered, and retrieving the digital fingerprint of a piece of content.
Using it takes an account, created free at proofx.co.uk. A request in conversation then produces a verification link that a third party can open. The record puts the user base at more than 300 creators, among them photographers, writers, journalists, and musicians.
What stands out
The verification link is built for outsiders, so proof can be handed to someone with no ProofX account.
Availability
Where ProofX is listed
ProofX is listed in the ChatGPT apps directory only. CyberSec AI Ltd has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
In the ChatGPT apps directory
- Developer
- CyberSec AI Ltd
- Filed under
- Security
- Listed since
- June 2026
- Authentication
- Authenticates when installed
- Website
- proofx.co.uk
- Policies published
- Privacy policy · Terms of service
- Official listing
- Open in ChatGPT
- Snapshot
- August 2026
Example prompts from the listing
- Protect this poem with ProofX
- Is ProofX content 6ab95b54-162 authentic?
- Who is ProofX creator c1c15c6c?
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This is an independent catalogue entry compiled by Node8 from ProofX's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with CyberSec AI Ltd, and inclusion here is not an endorsement.
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