name

SeedSigner - air-gapped Bitcoin signing device

synopsis

context

Summer of Bitcoin 2025 & 2026

period

April 2025 to present

stack

Python, Bitcoin, GitHub Actions, Raspberry Pi

description

SeedSigner is a DIY, air-gapped, stateless Bitcoin signing device built with off-the-shelf parts. I have contributed across two Summer of Bitcoin terms, and stayed on after both, working on features, bugfixes, release chores, PR review and translations.

highlights

• Automating the localization workflow across the code and translation repos, so a change to the source strings no longer means routine work for translators, contributors and maintainers.
• Built CI tooling that detects missing and stale translations across the 21 supported languages, catching errors before review rather than after it.
• Added a per-PR screenshot review page, so a translation can be judged in the screen it actually lands in.
• Extended BIP-85 support to enable direct child seed loading on-device.
• Refactored the Python codebase for maintainability and shipped UI alerts warning users of abnormally high transaction fees.
• Hardened the CI/CD pipelines and fixed targeted bugs, improving build reliability across releases.

links

• project
• my contributions
• translations repo