A. Martins Pacheco
Writing

Blog

Notes on software engineering, detection, and cyber security.

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Aug 2026 · 12 min · Privacy

I built a page that spies on you

I built a single HTML file that reads everything a website can learn about a visitor, then pointed it at my own hardened setup. Brave, Do Not Track, a DNS sinkhole for the whole flat — and it still named my GPU, my city and my job.