Notes you can run.
I write to understand the systems I build on: cryptography, wallets, search. Most essays have live demos inside, so you can test the idea yourself.
May 13, 2026 May 12, 2026 Apr 05, 2026
How a signature actually signs
Elliptic curves, signing math, and the one mistake that drains every wallet that makes it.
How to make a wallet out of randomness
A from-scratch tour of the cryptography behind every blockchain wallet, built live in your browser.
Your Bitcoin Is on Borrowed Time
An interactive deep-dive into post-quantum cryptography for blockchain. Run real Dilithium, FALCON, and SPHINCS+ in your browser and see why the clock is ticking.
+ playground
Apr 04, 2026 Understanding Regex Search: From grep to Sparse N-grams
An interactive deep-dive into how text search evolved over 50 years, from scanning every file to scanning almost nothing.
+ playground