Bip39 to binary https://files.fm/u/2eemhhak2q#design Checksum creation: A checksum is created from this entropy working with SHA-256 hashing, which assists confirm the mnemonic's integrity afterwards. Because of the cryptographic design of BIP-39, a weak passphrase does not reduce the safety of the other wallets or help reveal the seed words. but https://getidealist.com/story22466876/bip39-bip32-the-5-second-trick-for-bip39-compatible-wallet-https-dzen-ru-bip39-phrase-com