Digital evidence commitment
Prove a file stayed the same.
Create a SHA-256 fingerprint on your device. Stillmark records it on a public network and gives you a proof package anyone can verify — $9.95 per proof bundle.
No account needed · Your files never leave your device
Try it free on a test network. Free proofs are recorded on Base Sepolia and marked DEMO; they show exactly how Stillmark works but have no evidential value. Paid commits are recorded on Base Mainnet. Checking a proof is always free.
Create a proof
Check a file against a proof
Choose the original file. Everything is checked in your browser; the file is never sent anywhere.
Load the proof record
Choose the proof file (.stillmark.json) from your receipt or email.
Pay as you go
$9.95 / proof bundle
For individuals and occasional submissions.
- Multi-file commitment · up to 100 files
- Portable proof package and PDF receipt
- Free verification
Team
$49 / month · coming soon
For teams with repeat evidence workflows.
- Shared team workspace
- History, roles and exports
- Monthly proof allowance
API & Enterprise
Custom
For platforms, compliance providers and larger organisations.
- Commit API and webhooks
- Volume and OEM options
- Dedicated support and controls
✓ Verification stays free. You pay to create a proof; anyone can check one, here or with the open-source verifier, without paying or signing up.