Bip39 word checker https://papaly.com/1/eMEf Checksum creation: A checksum is generated from this entropy utilizing SHA-256 hashing, which assists verify 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 afterwards and so https://bookmark-media.com/story20457095/bip39-checksum-calculator-a-secret-weapon-for-bip39-mnemonic-https-dzen-ru-bip39-phrase-com