I took the index in the words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, included 3 zeros to your eight digits of your binary and bought 00000010011 which translates to 19 in https://maximusbookmarks.com/story19049127/5-simple-techniques-for-bip39-word-list-pdf