Browser Extension

Automatically timestamps every AI conversation turn on Claude, ChatGPT, and Gemini using RFC 3161

sigill-browser-extension
Chrome · Manifest V3 · Apache 2.0

Watches for completed AI responses in the browser, hashes the prompt and output using RFC 8785 canonicalization, and submits only the SHA-256 hash to an RFC 3161 Timestamp Authority. Your conversations never leave the browser.

ClaudeChatGPTGemini
Download extension (.zip)

Installation

  1. Download and unzip the file above into a folder on your computer.
  2. Open Chrome and navigate to chrome://extensions.
  3. Enable Developer mode using the toggle in the top-right corner.
  4. Click Load unpacked and select the unzipped folder.
  5. Visit sigill.ai while signed in — the extension picks up your identity automatically.
This is a public beta ahead of the Chrome Web Store launch. Install manually using the steps above — you will receive updates by downloading a new zip when available.