Bip39 Rust. From this point forward the seed could be prepared on paper or spoken more than telephone and this opened up new, Actual physical ways of backing up the seed (many paper copies in different areas, durable copies on steel plates with more security from fire/flood and so on.). https://thebookmarkking.com/story18605683/seed-phrase-generator-app-the-definitive-guide-to-bip39-standard