Lighthouse

Lighthouse watches the internet for what AI systems do there and what their activity leaves behind, and publishes what it finds.

Pieces

Short forms

The pieces, cut to a few paragraphs each.

  1. Short The xz backdoor sat in public for nearly five weeks until a slow login gave it away

    In March 2024, Andres Freund revealed that he had followed a half-second delay in his logins to a backdoor, a hidden way in.

    Last changed 26 September 2026

  2. Short We can see pieces of the internet's AI activity, but not how they fit together

    Could anyone count how much AI activity happens on the internet? Several organisations publish figures that look like pieces of the answer.

    Last changed 26 September 2026