Building a Cold Storage Netbook with Electrum by Coding In My Sleep video tutorial
Additional steps to increase security further:
- Read at least once the
and follow its security guidelines, like using a laptop that
had its wifi- and bluetooth-device physically removed.
- Generate a 12 word
casino grade dice
(as suggested in the Glacier protocol) and use this passphrase
as a seed extension. This increases the overall entropy that
went into your seed and it uses two different sources of entropy,
in case one of them, for example the random number generator on
your laptop, turns out to be too weak one day.
Both seed and seed extension have to be secured the same way.
You need both to recreate the wallet.
- Use an Android smartphone or tablet as your online-device. This makes
it much more convenient to exchange unsigned and signed
transactions via QR-codes between the online-device (your
smartphone or tablet) and offline-device (your permanently
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