cyb3ralbert
Infrastructure engineer. I write about things after building them, and I try to check claims against source rather than documentation — usually because the documentation turned out to be wrong.
Now
Bitcoin Core, and what it takes to establish a claim a reviewer would otherwise have to take
on faith — starting with
64 test vectors and the comment that cites them.
Alongside it, Kubernetes from scratch on a local hypervisor.
Writing
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A comment in a Bitcoin Core test file cites a URL that redirects instead of 404ing. Establishing that the replacement holds the same 64 vectors took four independent supports — and two negative controls to show the comparison could fail at all.2026-08-28
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Which tools a server puts in
tools/list, read line by line across six codebases. Includes the survey I got wrong and why.2026-07-29 · updated as servers change -
Wiring git-crypt's GPG mode through trezor-agent, so the repo key is never on the host. With the PIN-matrix mechanics explained and the unlock UX measured.2026-07-19
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Encrypting TOTP secrets with the device's own
CipherKeyValue, so only ciphertext is stored.2026-07-19 -
Deterministic reconstruction of the GPG identity from BIP39 via SLIP-0010, checked against the official test vector. Answers trezor-agent#335.2026-07-19
Code
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Reusable Claude Code skills, including the full step-by-step for the write-ups above.
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Working implementations for the two Trezor write-ups.
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Minimal Go client for a free feed of current Go/backend job postings.