Bip39 Ian Coleman. The passphrase just isn't picked with the predefined list of 2048 words – it may be any word or phrase you choose. Any person else who discovers the phrase can steal the bitcoins. It have to be retained mystery, for example it have to not be typed https://social4geek.com/story5138436/bip39-word-list-https-linktr-ee-bip39-bip39-wallet-fundamentals-explained