Bip39 Add Private Key A BIP39 mnemonic sentence can be a set of words (most commonly 12 or 24) that we could interact with a lot more properly than other people that are not words (bits and numbers along with the like). BIP39's reason in introducing the usage of mnemonic https://tornadosocial.com/story4245537/bip39-copyright-the-best-side-of-seed-phrase-generator