Bip39 Brute. From this position ahead the seed may very well be published on paper or spoken more than telephone which opened up new, physical ways of backing up the seed (multiple paper copies in several locations, strong copies on steel plates with more protection from hearth/flood and so on.). https://thekiwisocial.com/story4178658/what-is-a-starter-generator-not-known-factual-statements-about-bip-39