Bip39 Npm. Because of the cryptographic style and design of BIP-39, a weak passphrase isn't going to lessen the protection of the other wallets or support reveal the seed words. BIP39 is actually a structure implementation that lays out how copyright wallets produce the list of words (or "mnemonic codes") https://livebookmarking.com/story19521136/bip39-passphrase-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained