Bip39 Standard. The passphrase is not really picked from your predefined list of 2048 words – it can be any word or phrase you decide on. Yes, BIP39 passphrases are case-sensitive. Make sure to enter your passphrase specifically as you set it up, such as any uppercase or lowercase letters. https://bookmarktiger.com/story19422984/bip39-words-https-linktr-ee-bip39-bip39-wallet-fundamentals-explained