Bip39 Vs Slip39. The passphrase just isn't selected in the predefined list of 2048 words – it might be any word or phrase you choose. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. Every single word represents a range inside a binary sequence, https://sitesrow.com/story8607365/bip39-word-list-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic