[bibaheu]

You can generate the coin movement operation in the air gapped machine, write it down on paper, and then use a normal, connected computer to transmit it to the network. The private key never left the air gapped machine, with this method.

[Scoundreller]

The method I’ve read about is to print “the request” onto a QR code, have the air-gapped machine scan it, sign it and print off the signed transaction QR to be scanned into the networked computer to propagate to the network.

A bit more to trust but a lot less to type.

[polygamous_bat]

And then you get hacked anyway because the QR code generator was compromised and switched around a few bytes before creating the QR code.

[Scoundreller]

Ideally it’s a functionality of the wallet, but I think only bitcoin armory has this function.