Engineering Blog & Lab Notes

Articles, technical write-ups, and architectural insights from sofi.digital.

Cryptography & Math May 05, 2026 5 min read

Chaos in the Coordinates: How the Hailstone System Uses the Collatz Conjecture for Cryptography

Have you ever looked at a simple mathematical puzzle and wondered if it could be used to hide secrets?In 1937, German mathematician Lothar Collatz proposed a deceptively si...

Recent Publications

2 articles available

Cryptography & Math

Apr 21, 2026 • 3 min read

The Silence of the Sim

Sim racing is an exercise in data management. Whether you're hitting the apex at Spa or managing fuel at Le Mans, you're constantly processing telemetry in your head. But f...

John Harrison

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Hardware & AI

Mar 30, 2026 • 3 min read

From E-Waste to AI Engine: The £0 "Led Zeppelin" Home Lab

Don't Bin Your Old PC: How I Built a Private AI Server for £0 Most people see an old Dell Optiplex gathering dust in a cupboard as e-waste. I saw a private brain. I recent...

John Harrison

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