BonusBitcoin bonus
Safu Ninja
DIY steel seed-phrase backup you can build from off-the-shelf parts for private, resilient storage.
Migration in progress
This bonus page hasn't been rewritten for RaspiBolt v4 yet. The v3 version still works, see the original guide on GitHub while we port it over.
Safu Ninja is a DIY method for building fire- and water-resistant steel backups of your mnemonic seed phrases. It uses only off-the-shelf components, which means no third-party vendor ever learns you own a hardware wallet or what the device is guarding.