https://arstechnica.com/information-technology/2018/04/new-hacks-siphon-private-cryptocurrency-keys-from-airgapped-wallets/
Apr 24, 2018 - Beware of smartphones and cameras around wallets storing your digital coin.
newhackssiphonprivatecryptocurrency
https://github.com/johnshearing/PrivateKeyVault
Make Instructions: Airgapped raspberry pi computer for working with blockchains featuring LUKS full disk encryption and using qr-codes to pass encrypted files...
raspberry pigithubmakeinstructionsairgapped