Bip39 Mnemonic Code. From this stage forward the seed might be written on paper or spoken about telephone which opened up new, Bodily means of backing up the seed (a number of paper copies in various spots, sturdy copies on metal plates with added protection from fire/flood and so forth.). https://expressbookmark.com/story18738704/bip39-seed-phrase-word-list-top-bip39-word-list-txt-secrets