Bip39 Passphrase Empty For None ) A BIP39 mnemonic sentence is really a set of words (most often twelve or 24) that we could interact with more productively than other people that aren't words (bits and figures as well as like). BIP39's intent in introducing the usage of mnemonic words https://bookmarkspecial.com/story18747571/bip39-js-cdn-details-fiction-and-bip39-word-list