Cold Storage

Do everything and more

USB drives can break easily. Paper wallet is better assuming you have a safe.

echo Print these each on a separate piece of paper; echo Data\:; head -c 32 /dev/urandom > keyfile; echo $myprivatekey | openssl aes-256-cbc -kfile keyfile | xxd -ps -u -c2 | while read i; do echo -n $i\ ; done; echo Keyfile\:; xxd -ps -c2 -u keyfile | while read e; do echo -n $e\ ; done; rm keyfile

Ledger wallets sign transactions on a micro controller without exposing the private key to the device it's connected to. The private key does not need to leave the Ledger wallet.