Bip39 Light Standard. From this point forward the seed might be published on paper or spoken above phone and this opened up new, Actual physical ways of backing up the seed (many paper copies in different areas, strong copies on metal plates with further security from hearth/flood and so forth.). https://finance-online61594.wikikali.com/1003082/the_anatomy_of_the_bip39_phrase_entropy_text_and_protection