Bip39 Checksum. Entropy values has to be sourced from a powerful source of randomness. What this means is flipping a good coin, rolling a fair dice, noise measurements and so on. Usually do not use phrases from publications, lyrics from tunes, your birthday or steet deal with, keyboard mashing, or https://directoryrec.com/listings603005/bip39-passphrase-generator-https-linktr-ee-bip39-not-known-details-about-bip39-online