Engineering Notes
Technical writing from GreyBound Bitcoin Engineering & Security — for teams building production Bitcoin systems, not a marketing blog.
Airgap doesn't fix a wallet seed that was born weak, and how multi-sig can help or worsen the case
Aug 17, 2026 · 14 min
A seed is a birth event.
Airgap does not fix a seed that was born weak. Airgap is not a random-number generator. Firmware updates don’t un-birth weak words. Multisig only helps if the keys were born independently.
Three questions before you Approve Bitcoin transactions — or you’re signing blind
Aug 12, 2026 · 8 min
What you approve is not what you signed.
The Approve screen is not the contract you sign. Your wallet shows a story. Bitcoin settles a contract. Three questions before Approve — or you’re signing the package, not the screen.
Bitcoin Production Readiness: What Every Engineering Team Should Validate Before Launch
Aug 7, 2026 · 12 min
What to validate in wallets, signing, nodes, backends, and operations before real funds are involved.
Production hides different failures than development: irreversible payments, key recovery, node/RPC exposure, indexer lag, and untested restore paths. A practical framework for teams about to launch.