Bip39 Tool. The passphrase just isn't chosen within the predefined list of 2048 words – it could be any word or phrase you select. Any individual else who discovers the phrase can steal the bitcoins. It must be kept secret, one example is it have to not be typed into https://infopagex.com/story4202855/bip39-mnemonic-https-linktr-ee-bip39-the-best-side-of-bip39-mnemonic