Storage is measured as retained evidence (GB-months), not upload size. You only pay extra when you retain unusually large volumes over time.
Storage refers to the evidence and certificate artifacts retained in CanonProof (file + certificate outputs). This prevents costs from spiralling while keeping retention predictable for professional workflows.
Storage limits apply to evidence you keep in CanonProof over time (GB-months). It’s designed to reflect real long-term cost — not penalise one-off uploads.
If you retain more than your included storage, you pay a simple monthly overage per additional 50 GB. No per-file size surprises.
Anyone can verify a certificate by ID at any time. Plans cover creating new certificates and evidence retention — not checking.
For system-to-system verification and platform embedding — no dashboards, no subscriptions.
| Monthly volume | Price per verification | Included |
|---|---|---|
| ≤ 1,000 | £1.00 | Signed JSON certificate · 12-month retention |
| 1,001 – 10,000 | £0.75 | Signed JSON certificate · 12-month retention |
| 10,000+ | £0.50 | Signed JSON certificate · 12-month retention |
API-only plans are designed for automated verification. If you need dashboards, case management, or extended retention, choose a subscription plan above.
CanonProof is built for high-stakes evidence workflows. These are the questions most teams ask before adopting it.
Retained storage refers to evidence stored in CanonProof over time (the file you upload, plus certificate outputs). It’s measured as GB-months and aligned with your plan’s retention window.
Yes. Anyone can verify a certificate by ID without logging in. Pricing applies to creating new certificates and retention.
Overages are billed as a simple monthly add-on per additional 50 GB retained. You’ll always be able to see usage before it becomes a problem.
Issue your first CanonProof certificate in minutes — or embed verification into your platform with the API.
Public verification requires no account • Plans start at £499/mo