Bip39 Adalah. From this stage forward the seed can be penned on paper or spoken in excess of telephone which opened up new, physical means of backing up the seed (multiple paper copies in various areas, resilient copies on metallic plates with more security from hearth/flood and so on.). Warning: https://bookmark-search.com/story18504964/copyright-seed-phrase-generator-bip32-vs-bip39-no-further-a-mystery