Prove the file existed before you shared it
Without Uploading Them.
Hash a file privately in your browser, then keep a timestamped certificate with the work. Your file never leaves your device.
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How It Works
Three steps. A cleaner record.
Hash Locally
Your file is hashed with SHA-256 directly in your browser using WebAssembly. The file never leaves your device.
Timestamp the Hash
The hash is sent to a timestamp authority, creating independent evidence that this exact fingerprint existed at that time.
Keep the Certificate
You get a PDF certificate and verification link. OpenTimestamps adds a public blockchain anchor once the proof confirms.
Features
Proof habits that do not get in the way.
Your File Stays Private
Your file is hashed in the browser. Provelio receives the SHA-256 hash, not the file itself, so confidential drafts, demos, designs, and source archives stay on your device.
PDF Certificates
Every proof generates a downloadable PDF certificate with the hash, timestamp details, and verification link in one place.
Blockchain Anchoring
Proofs are anchored via OpenTimestamps, giving you an independent public timestamp in addition to the certificate.
Instant Verification
Anyone can verify a certificate by dropping in the original file. No account required.
Developer API
REST API with API key authentication for products, release workflows, document systems, and internal tools.
Bulk Timestamping
Upload many files at once. Each is hashed locally and timestamped independently for a cleaner project record.
Evidence
A timestamp is not a magic shield.
It is a cleaner timeline.
Copyright can start before paperwork does.
In many places, copyright can exist from the moment a work is created. A Provelio certificate does not replace registration, contracts, or legal advice. It gives you a dated, cryptographically verifiable record that a specific file fingerprint existed at a specific time.
RFC 3161 Timestamps
RFC 3161 is a long-standing timestamping standard. It helps create independent evidence for the file hash and timestamp.
Blockchain Anchor
OpenTimestamps adds a second public timestamp layer. The goal is portability, not hype: your proof should be checkable later.
Self-Contained Certificates
Each PDF certificate keeps the important details together: hash, timestamp data, status, and verification link.
Simple Pricing
Start free. Scale when ready.
30 free proofs every month — no credit card required. Need more? Creator and Pro plans are there when the habit sticks.
Use Cases
Who it's for
Creators
Musicians, designers, writers — prove your work existed before you share it with the world.
Institutions
Schools, universities, exam boards — attest document authenticity at scale with tamper-proof records.
Businesses
IP departments, legal teams, R&D labs — timestamp intellectual property before disputes arise.
When to Use It
Use it before the file leaves your hands.
Before a Client Review
Timestamp the design export, deck, or draft before sending it. Keep the certificate with the brief and delivery email.
Before a Demo or Submission
Timestamp the song demo, manuscript, script, game build, or pitch deck before it goes to collaborators or reviewers.
Before an Internal Handoff
Timestamp source zips, invention notes, contracts, or generated documents before they move between tools or teams.
FAQ
Common questions
Make the record before the share.
30 free proofs every month — no credit card required.
Start with one file that actually matters.