Bip39 Standard. The passphrase is not picked with the predefined list of 2048 words – it might be any word or phrase you end up picking. Yes, BIP39 passphrases are circumstance-sensitive. Make sure to enter your passphrase accurately while you set it up, which include any uppercase or lowercase letters. https://hindibookmark.com/story20433333/bip39-mnemonic-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic