Bip39 wallet android http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Checksum creation: A checksum is created from this entropy making use of SHA-256 hashing, which assists confirm the mnemonic's integrity later. Due to the cryptographic style of BIP-39, a weak passphrase would not reduce the safety of the opposite wallets or help expose the seed words. https://dirstop.com/story26707602/bip39-vocabulary-helping-the-others-realize-the-advantages-of-bip39-passphrase-https-cutt-ly-uryc5rw7