Quote from: Vampobit on January 02, 2023, 06:25:48 PM

Could you elaborate more? I am interested in what you say. What devices are you referring to? Can you give me specific mentions?

You can use any old computer as an airgapped device to either run a digital cold wallet, or to securely generate paper wallets. An old desktop or laptop works well. I always suggest opening up the device in question and physically removing any connectivity hardware, such as ethernet cards, WiFi cards, Bluetooth chips, etc. That way you can be certain you will never accidentally connect to a network and risk your data or your coins. Once you've done that, you should format the device and install a good open source Linux distro of your choosing.

Once you have a permanently airgapped device, then you can install software such as Bitcoin Core or Electrum to generate and run an airgapped wallet. You would create a complementary watch only wallet which contains only your public keys or addresses on your internet connected computer in order to watch your addresses for incoming transactions and so on. You can then use this watch only wallet to create unsigned transactions, move the unsigned transaction to your airgapped device via either QR codes or a USB drive to be signed, and then move the signed transactions back again to be broadcast to the network.

Alternatively, you can use your airgapped device to generate paper wallets. For paper wallets, I much prefer using a seed phrase to generate an entire wallet rather than a single key pair for a variety of reasons. It means I can have multiple addresses rather than just one, which is better for privacy. I can create my paper wallet by writing down a seed phrase accurately by hand. Writing down a key pair is prone to errors, and printing a key pair adds additional risk in that the printer may be WiFi capable or have internal storage and so on. Importing a seed phrase also avoids the risk of importing a private key to some software which will send your change to an address you do not have saved anywhere and will therefore be lost. To spend from the paper wallet it should only ever be imported back on to your airgapped device and spent from in the same way I described above for a digital cold wallet.

Quote from: Vampobit on January 02, 2023, 06:25:48 PM

I know what airgaped means, but I thought my coldcard already meets these criteria

Yes, a ColdCard is an airgapped hardware wallet.