Bip39 Documentation. From this level ahead the seed can be prepared on paper or spoken in excess of phone and this opened up new, Bodily means of backing up the seed (multiple paper copies in numerous places, durable copies on metallic plates with further protection from fireplace/flood and so on.). https://socialrus.com/story18040649/bip39-xmr-the-single-best-strategy-to-use-for-how-does-a-starter-generator-work