Bip39 Standard. The passphrase will not be picked with the predefined list of 2048 words – it could be any word or phrase you select. Anybody else who discovers the phrase can steal the bitcoins. It need to be stored secret, one example is it need to not be typed https://socialdosa.com/story8980635/ian-coleman-bip39-https-linktr-ee-bip39-a-simple-key-for-bip39-unveiled