Sign your files with a certificate of authenticity
A certificate carrying your organization's legal name, embedded inside the file itself. The seal proves who created it — and any later change to the pixels breaks validation, detectably, by any compatible verifier.
Three ways to sign, none of them requiring a server of your own
The dashboard signs one file at a time. These are the paths for handling volume.
Watched-folder agent
Windows and macOS. Point it at a folder; it signs what's already there and what arrives afterward. Disk-backed queue, so nothing is lost if it closes mid-batch.
MCP Server
Gives Claude Desktop or an internal agent the ability to sign and verify on its own, inside the tool your team already works in.
HTTP API
One call with a key. Build the pipeline in Power Automate, Apps Script, Make, Zapier, or connect it to your ERP, LMS, or asset manager.
curl -X POST https://api.verisignumdigital.com/v1/shield/sign \
-H "Authorization: Bearer vsg_live_9f8a7..." \
-F "file=@final_deposition.mp4" \
-F "author=Partner university" \
-o final_deposition_signed.mp4
# 200 OK — the response is the file itself, already signed.
content-type: video/mp4Frequently asked questions
What is the certificate of authenticity?
An open digital-provenance standard that embeds a cryptographic signature inside the file itself. The signature carries the signer's certificate and lets anyone verify whether the file was altered afterward.
What's the difference between the certificate of authenticity and ordinary metadata?
Metadata is an editable label: anyone can rewrite the author field in seconds. The certificate of authenticity is computed from the content with a private key — it can't be forged without that key, and any later change breaks validation.
How do I sign files in bulk, without writing code?
The watched-folder agent (Windows and macOS) handles it: point it at a folder and it signs everything, with a disk-backed queue that resumes on its own.
Is there an API to integrate signing into another system?
Yes, a single HTTP call with a key — the full reference is public.
Already have a file in hand and want to know if it was altered or shows signs of AI? See how to check if a file was altered or how to check if an image is AI.
Pricing Structured for Any Scale
From the freelance photographer who needs to authenticate their work, to large corporations processing thousands of media files a month via API.
The unit is the credit: 1 credit = 1 image, 1 second of video, or 1 second of audio — a minute of video uses 60. Anything beyond the plan's included credits is billed at the end of the month, without interrupting service.
Freelancers & Creators
Ideal for digital artists, independent journalists, and researchers.
- 1,500 credits/mo
- Web Dashboard Access
- Basic Technical Support
Professional (SMBs)
The solution for law firms, media agencies, and HR teams.
- 7,500 credits/mo
- B2B Integration API Keys
- PDF report for every verification
Enterprise (B2B)
For universities, insurers, and large-scale integration into their own systems.
- 25,000 credits/mo
- MCP Server Integration
- Multi-Tenant Management