Bip32 And Bip39. From this place forward the seed could be created on paper or spoken more than phone and this opened up new, Actual physical ways of backing up the seed (a number of paper copies in numerous places, resilient copies on metallic plates with further protection from hearth/flood https://pageoftoday.com/story4169559/bip39-colors-a-secret-weapon-for-bip39-tool