Bip39 library https://www.plurk.com/p/3hf2syltjx Checksum creation: A checksum is generated from this entropy working with SHA-256 hashing, which can help validate the mnemonic's integrity later on. For words that have only 3 letters, there is absolutely no 4th letter. As an example With all the word “add”, there aren't any extra http://www.video-bookmark.com/user/tucanewhmt