Bip39 Node Js A single example of manually generating entropy could be flipping a coin. However, if an attacker provides you with a coin that's weighted slightly in favor of heads, your Original source of entropy should have been corrupted. For the reason that BIP39 mnemonic codes can be used https://social-medialink.com/story3937777/bip39-wallet-the-5-second-trick-for-bip39-word-list