I took the index with the words, converted the amount to binary, added a few zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to transform it to binary, extra a few zeros on the 8 digits of your binary and got 00000010011 which translates to https://bookmarkboom.com/story19593526/the-basic-principles-of-bip39-passphrase-generator