Bip39 Github. Consider ways to securely back up and go to the passphrase if required: Although you can theoretically rely upon your memory, you might want to look at a secure backup strategy. Entropy is a complicated aspect. Your mnemonic might be insecure if this feature is applied incorrectly. Read https://naturalbookmarks.com/story19516666/bip39-wallet-https-linktr-ee-bip39-getting-my-bip39-passphrase-to-work