Penlock is an open-source, cryptographically secure, printable paper-computer. It guides users through secret-splitting their BIP39 seed phrase without an electronic device.

This is a beta release, exclusively intended for peer-reviewing and early testing. The public release is planned for Q3 2024 and it is likely, but not guaranteed, to be backward-compatible with the present documents. If we break compatibility, this beta-version will still be available at the current address (beta.penlock.io).

Please note that the following pieces are still missing:

Professional UI/UX Illustrated examples The password generation guide "Universal" browser compatibility Compatibility: Penlock displays & prints well in Chromium-based browsers (Chromium, Brave, Opera, Vivaldi, Edge, ...). There seems to be issues with Firefox, and Safari hasn't been tested yet.