Bip39 Checksum. Entropy values should be sourced from a strong source of randomness. This implies flipping a fair coin, rolling a fair dice, noise measurements etc. Do NOT use phrases from books, lyrics from tunes, your birthday or steet address, keyboard mashing, or nearly anything you believe is random, because https://worlds-directory.com/listings13156673/bip39-seed-generator-https-linktr-ee-bip39-5-tips-about-bip39-python-you-can-use-today