Bip39 Github 1 example of manually creating entropy might be flipping a coin. But when an attacker provides you with a coin which is weighted a little in favor of heads, your Original supply of entropy could have been corrupted. Backup: At the time generated, the seed phrase is displayed https://atozbookmark.com/story18618974/bip39-number-of-words-5-essential-elements-for-seed-phrase-generator