Bip39 java https://rylanmecp341.wpsuo.com/bip32-vs-bip39-which-is-better-for-your-copyright-demands Checksum development: A checksum is created from this entropy working with SHA-256 hashing, which will help validate the mnemonic's integrity later on. For words that only have three letters, there's no 4th letter. For example Using the word “add”, there won't be any more letters afterw... https://travialist.com/story10938298/iancoleman-bip39-github-new-step-by-step-map-for-bip39-standard-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw