Bip39 docs https://bip39marco.mystrikingly.com/ Checksum generation: A checksum is generated from this entropy working with SHA-256 hashing, which helps verify the mnemonic's integrity later on. Since adding a passphrase in your seed words creates a completely new wallet, some other passphrase you enter (which includes a passphrase entered incorrectly) will develop https://social-galaxy.com/story6124058/bip39-wallet-recovery-the-single-best-strategy-to-use-for-bip39-word-list-txt-https-cutt-ly-uryc5rw7