How do we know the device (Blue Wallet, Passport.. etc.) wouldn't transfer the seed off itself using QR code?
Keystone:
Keystone’s QR codes are transparent. Users can verify what is getting in and out of their hardware wallets, ensuring no sensitive information is leaked. The team released the hardware wallet industry’s first open-source tool to decode the QR codes for users to know how the software works and enable signing off on intended transactions.
Can this also be used for all other QR codes?
Source:
https://blog.keyst.one/ever-wondered-what-your-hardware-wallet-inputs-and-outputs-9b33b4cedafd