Prove Your Files Existed.
Without Uploading Them.
Hash your files privately in your browser. Get a court-grade timestamp backed by the Bitcoin blockchain. Your files never leave your device.
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How It Works
Three steps. Permanent proof.
Hash Locally
Your file is hashed with SHA-256 directly in your browser using WebAssembly. The file never leaves your device.
Timestamp Instantly
The hash is anchored to RFC 3161 Time Stamp Authorities, creating a cryptographic proof of the exact moment.
Anchor Forever
OpenTimestamps embeds the proof into the Bitcoin blockchain — an immutable, publicly verifiable record.
Features
Everything you need.
Nothing you don't.
True Zero-Knowledge
Your files are hashed entirely in the browser using WebAssembly. No file data is ever uploaded, transmitted, or stored on our servers. We prove existence without ever seeing the content.
PDF Certificates
Every proof generates a downloadable PDF certificate with embedded cryptographic evidence — ready for legal proceedings.
Bitcoin Permanence
Proofs are anchored to the Bitcoin blockchain via OpenTimestamps — immutable and independently verifiable by anyone, forever.
Instant Verification
Anyone can verify a certificate by dropping the original file — no account required. Cryptographic proof checked in seconds.
Developer API
REST API with API key authentication. Automate timestamping in your CI/CD pipeline, legal workflows, or custom applications.
Bulk Timestamping
Upload hundreds of files at once. Each is hashed locally and timestamped independently — perfect for large IP portfolios.
Simple Pricing
Start free. Scale when ready.
5 free proofs every month — no credit card required. Need more? Upgrade to Pro for unlimited certificates.
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.
Trusted by Creators & Teams
Don't take our word for it.
"I timestamp every track before sending it to producers. Provelio gives me peace of mind that my work is protected, without uploading a single file."
Sarah M.
Independent Musician
"We issue hundreds of certificates each semester. The bulk timestamping and API integration saved our registrar team hours of manual work."
Dr. James L.
University Administrator
"Our legal team needed tamper-proof timestamps for R&D documentation. The Bitcoin anchoring makes these proofs independently verifiable — exactly what we needed."
Priya K.
IP Counsel, Tech Startup
FAQ
Common questions
Your next idea deserves proof.
5 free proofs every month — no credit card required.
Upgrade when you're ready.