Bip39 Languages One illustration of manually building entropy could well be flipping a coin. However, if an attacker will give you a coin which is weighted somewhat in favor of heads, your Original supply of entropy will have been corrupted. You can see the full source code in standalone, offline https://bookmarklethq.com/story18536908/kotlin-bip39-the-smart-trick-of-bip39-phrase-that-nobody-is-discussing