A movement for verifiable digital proof
Make important digital claims easier to verify.
ProofStamp helps people and businesses create independent evidence that an exact digital item existed at a certain time without exposing the private data.
Sample proof receipt
✓ Exact match verified
project-proposal-v7.pdf
Cryptographic fingerprint
SHA-256 4a1d9f32a7c8…e611b83c
Recorded
14:32 UTC
File exposure
None
The original stays private. Only its fingerprint and timestamp become public.
How it works
From private file to portable evidence.
The technology is precise. The experience should feel simple.
01
Create a fingerprint
Your browser/device calculates a SHA-256 hash —a unique fingerprint of the exact file or data.
02
Record a public timestamp
The fingerprint is anchored to a tamper-evident public record.
03
Verify independently
Anyone with the original can recalculate its fingerprint and confirm the timestamp and exact match.
Credibility starts with limits
Proof is valuable because the claim is precise.
What it can establish
Evidence of existence and integrity.
- This exact digital item existed at or before a recorded time.
- The item presented now matches the stamped version.
- The verification can be repeated without asking one vendor for permission.
What it cannot prove alone
The truth of what is inside.
- That the content is accurate, honest, or complete.
- Who created it, unless identity is verified separately.
- Its legal validity, location, or device history without additional evidence.
Practical use cases
Start with an expensive trust problem.
Businesses do not buy abstract cryptography. They buy stronger evidence, smoother audits, fewer disputes, and clearer customer confidence.
AI output receipts
Create a timestamped receipt for AI session trace
Document version proof
Show that an exact proposal, policy, invoice, contract draft, or report existed before a recorded time.
Photos and field evidence
Preserve the integrity and timing of before-and-after work, inspections, deliveries, and incident records.
Business logs and snapshots
Create periodic proofs of logs, exports, datasets, or system states to strengthen an audit trail.
Choose your path
Make proof useful in the real world.
For businesses
Reduce ambiguity before it becomes a dispute.
We help teams identify one high-value proof workflow and test it without forcing crypto into the customer experience.
- Map the claim, evidence, and intended verifier.
- Prototype a clear receipt and verification flow.
- Measure whether it reduces risk or friction.
For partners
Turn trust infrastructure into something people can use.
ProofStamp works with AI, SaaS, legal, evidence, standards, and infrastructure organizations.
- Focused 4–6 week pilot.
- Product or API integration.
- Education, workshops, or co-marketing.
Open principles
Strong proof starts with honest design.
Private by default
Keep originals off-chain and calculate fingerprints locally whenever possible.
Independent
A proof should remain checkable without trusting one interface or company.
Interoperable
Prefer portable formats, open methods, and verifiers that outlive a product.
Human-readable
Normal users should see a clear plain text HSA-256 hash
Learn
Understand the trust layer we are building.
Plain-language education for people who need evidence which is easy to verify and impossible to fake.
Start here
Trust Is the Invisible Infrastructure of Civilization
Why trust is infrastructure, how AI changes the economics of claims, and where verifiable proof fits.
Help make digital proof normal.
Bring us one costly trust problem. We will help define the smallest useful proof workflow.