I took the index in the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra 3 zeros to your eight digits in the binary and acquired 00000010011 which interprets to 19 in decimal. https://exactlybookmarks.com/story18805688/facts-about-bip39-seed-phrase-word-list-revealed