Tailprint
🛡ī¸ Dual-Brain Zero-OCR JSON + Cryptographic Proof-of-Origin

Verify & Inspect Dual-Brain PDFs

Drop any Tailprint PDF to verify its HMAC-SHA256 cryptographic signature, check visual page stream integrity against tampering, and extract its embedded structured JSON payload in 0ms without OCR.

📄 1. Select or Drop PDF File

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Click to browse or drag & drop PDF

Inspects tailprint-manifest.json & page stream hashes

How Dual-Brain & Tamper Detection Works:

1. Zero-OCR JSON-LD: Structured data is embedded directly inside the PDF catalog (/Names/EmbeddedFiles).

2. Stream Fingerprinting: SHA-256 over all visual PDF page streams & dimensions detects even a 1-character text edit or added page.

3. HMAC-SHA256 Proof: Cryptographic signature binds issuer, timestamp, data hash, and visual content fingerprint together.

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Ready to Inspect & Verify

Drop any PDF on the left or look up a doc_... ID above to view its cryptographic proof-of-origin and zero-OCR structured JSON payload.