SHA-256 content integrity sealing for HTML pages. Auto-stamps, verifies, and blocks tampered deploys.
What Is the Authenticity Seal?
The Authenticity Seal™ cryptographically fingerprints every HTML page using SHA-256. Any modification — whether by a human, an AI, or a script — is immediately detectable.
Every seal contains:
- Digital Fingerprint — SHA-256 hash of the page content
- Audit Changelog — timestamped, agent-attributed record of every change
- REPRO_COUNT — counts how many times the page was verified without changing
- CONTENT_MAP — forensic snapshot of key elements (h1, h2, p, title) for WAS/NOW diffs
Features
| Feature | Description |
|---|---|
| 🔏 Auto-stamp on save | Detects content changes and re-seals automatically |
| 📊 Status bar indicator | Live SECURE / TAMPERED / NO SEAL badge |
| 🔍 Verify command | Check any HTML file's seal integrity instantly |
| 📋 Audit log panel | View the full changelog in a premium dark-mode webview |
| 📁 Stamp all | Batch-seal every HTML file in your src/ directory |
| ✂️ Strip seal | Remove a seal cleanly (with confirmation) |
Commands
| Command | Description |
|---|---|
Seal: Stamp Current File |
Stamp the active HTML file |
Seal: Stamp All HTML Files |
Batch stamp all pages in srcDirectory |
Seal: Verify Current File |
Check if the seal is SECURE or TAMPERED |
Seal: View Audit Log |
Open the seal changelog webview panel |
Seal: Strip Seal from Current File |
Remove the seal block |
Configuration
{
"authenticitySeal.autoStampOnSave": true,
"authenticitySeal.srcDirectory": "src",
"authenticitySeal.agentName": "Agent Goodlady",
"authenticitySeal.showStatusBar": true,
"authenticitySeal.defaultThought": "Content updated via Authenticity Seal VS Code extension."
}
How It Works
1. You edit an HTML file and save
2. The extension detects the content hash changed
3. It auto-re-stamps: embeds a new SHA-256 fingerprint + changelog entry
4. Status bar shows 🔏 Seal: SECURE
5. If someone modifies the file without re-stamping → ⚠️ Seal: TAMPERED
The seal is embedded directly in the HTML as a hidden <!-- AGENT GOODLADY LOG START --> block — no server required, no external dependencies, verifiable in any browser.
The Audit Log Panel
Click the status bar item or run Seal: View Audit Log to open the full audit panel:
- Digital Fingerprint — full 64-char SHA-256 hex
- Reproduction Score — how many times verified without changes
- Changelog table — every stamp with timestamp, agent, rationale, and change description
- Tamper detail — stored vs computed hash when TAMPERED
Why This Matters
For regulated industries (finance, legal, healthcare), document integrity is not optional. The Authenticity Seal provides:
- Evidence of non-tampering — cryptographic proof the content hasn't changed
- AI audit trail — records when an AI agent made a change and why
- Deploy gate — blocks deployments when a page has been edited without re-sealing
© 2026 Goodlady Limited
Company No: 16986244 · goodladyfinance.com
Patent pending. For commercial licensing enquiries: [email protected]