Did you know you can use Krux to sign files releases, etc? You can store your private key offline, in a QR code, Encrypted QR code, a TinySeed...
Use this scrip to help you create a signature and a public key which openssl could use for verification:
We are testing krux encrypted mnemonic QR codes as a way to diversify mnemonic storage and transport. There are 48k sats associated with the mnemonic encrypted on upper QR code. The wallet is native Segwit, there's no passphrase. You can try to hack, share this or send some sats the wallet to increase the bounty through bottom QR code address.
Of course, please share the vulnerability if you find one.
Krux encrypted mnemonic QR codes.
Use case is similar to passphrases but UX is different. Can be used together with passphrases as additional security layer and enhance storage and transport security.
For U$65 you'll not only get a super fast signing device with 3,5" capacitive touch screen, battery, camera, etc. It also already comes with a (not fancy) opsec case for you to store and carry it around ๐
Half of my feed is about shilling Puravida, so I had to try it. The thing just took my 10000 sats and left me empty handed, saying the invoice expired. Watch out guys!
There's no such thing as a sovereign hardware, as even FOSS projects depend on chips from corporations. Best we can do in search of sovereign solutions is make software simple and flexible enough to run on multiple hardware, like Bitcoin. Supply chain security is a thing.