Bip39 Github. Entropy values has to be sourced from a solid source of randomness. This means flipping a good coin, rolling a good dice, sound measurements etc. Will not use phrases from textbooks, lyrics from music, your birthday or steet tackle, keyboard mashing, or anything you're thinking that is random, https://directoryforrank.com/listings13119350/bip39-standard-https-linktr-ee-bip39-bip39-npm-no-further-a-mystery