Bip39 Npm. Entropy values need to be sourced from a solid source of randomness. What this means is flipping a good coin, rolling a fair dice, sounds measurements etc. Don't use phrases from textbooks, lyrics from songs, your birthday or steet handle, keyboard mashing, or something you think is random, https://exceeddirectory.com/listings563885/bip39-checksum-https-linktr-ee-bip39-bip39-words-an-overview