The Trust Layer for Digital Content
Create tamper-evident proof records for documents and text - including human-authored, AI-assisted, and hybrid workflows. Register SHA-256 integrity fingerprints, attach optional cryptographic signatures, and share verification certificates third parties can inspect independently.
Supports PDF, DOCX, TXT, and images · Audio and video not yet supported, we're evaluating them for a future release.
SHA-256 integrity fingerprints
Optional Ed25519 signatures
Chain-of-custody audit trail
Example proof records
How It Works
Four steps to verifiable proof
Create tamper-evident records, preserve chain of custody, and make verification simple.
Submit content
Upload PDFs, documents, text, or images through a secure encrypted pipeline.
Register proof
AuthProof computes a SHA-256 integrity fingerprint and creates a tamper-evident proof record.
Sign & enrich
Optionally sign with your Ed25519 signing key. Similarity and writing-style signals add review context.
Verify independently
Share a public verification certificate or signed PDF that third parties can inspect on their own.
Product demo
See how proof records work
Upload content (including AI-assisted drafts), register a SHA-256 integrity fingerprint, enrich the record with supplementary similarity and writing-style context where enabled, and share an independent verification certificate.
Use cases
Built for high-trust digital workflows
AuthProof is onboarding founding customers in media and education first - with the same proof engine designed to expand across legal and enterprise workflows.
Initial focus
Journalism & Media
Preserve source documents and images, document chain of custody, and share verification certificates - including when drafts may be AI-assisted or resubmitted across desks.
Media workflowsInitial focus
Education
Create verifiable proof records for assignments, academic submissions, and research documents - with integrity evidence, optional similarity alerts for prior registrations, and supplementary context for AI-assisted work reviewed by humans.
Education workflowsDesigned to expand into
Legal & evidence
Support evidence integrity and tamper-evident records for digital documents.
Enterprise
Build an auditable authenticity layer into digital asset workflows.
Sample verification report
Preview a signed PDF report with integrity hash, chain-of-custody timeline, optional signature details, content similarity advisories when applicable, and supplementary writing-style signals for AI-assisted content.
Instant Lookup
Verify by text or hash
Paste any text or a SHA-256 hash to instantly check if it exists in AuthProof. No account required.
Text detected - will be hashed and looked up
Why AuthProof
Trust infrastructure, not marketing theatre
We don't ask customers to trust AuthProof blindly. We show them what can be verified.
Cryptographic integrity proof
Every submission receives a SHA-256 content fingerprint. Optional Ed25519 signatures cryptographically bind records to your account's active signing key.
Chain-of-custody audit trail
Full timeline from upload through analysis, signing, and report generation - designed for editorial, and compliance review.
Encrypted signing key storage
Signing keys are stored encrypted at rest. Private keys never leave the system unencrypted.
Global platform
Built for organizations worldwide with secure cloud infrastructure and transparent verification certificates.
Honest proof scope
Every verification certificate clearly states what the record confirms - and what it does not - so recipients can evaluate proof honestly.
Supplementary analysis signals
Content similarity registry checks (including large documents) and optional writing-style analysis for AI-assisted content enrich the record for human review. They supplement - never replace - hash-based integrity proof.
Now onboarding our founding customers
We're working with a limited group of media, education, and enterprise teams to shape AuthProof's proof records, cryptographic signatures, and verification workflows. Founding customers receive introductory pricing, direct founder access, and priority onboarding support.
- · 30-day paid pilot available
- · Organization workspaces (planned)
- · Signed PDF verification reports on paid plans
Pricing
Simple, transparent pricing
Start free. Scale as you grow. Enterprise options available.
Need more? Save 20% with yearly billing →
Ready to create your first proof record?
Start free with 10 proof records per month - or join our Founding Customer Program for introductory pricing and direct founder onboarding.