Bip39 Hardware Wallet. From this issue ahead the seed might be penned on paper or spoken over telephone and this opened up new, physical means of backing up the seed (many paper copies in numerous destinations, long lasting copies on steel plates with added safety from hearth/flood and so on.). https://financemanager81470.wikitelevisions.com/6904064/the_anatomy_of_the_bip39_phrase_entropy_text_and_protection