Part 6/13:
Many wallets tout “air-gapped” design—meaning they don’t have Bluetooth, USB, or other communication options. Examples include Keystone or Coldcard wallets. They utilize QR codes or SD cards for data transfer.
While eliminating direct communication reduces attack vectors, this doesn’t automatically make them safer. Attackers could still compromise the device by inserting maliciously crafted SD cards or exploiting QR code vulnerabilities. Moreover, especially for newcomers, added complexity makes usability harder, increasing the chance of user error—which ironically can reduce security.