Bip39 Mnemonic Code Converter Tool. The passphrase is not really picked through the predefined list of 2048 words – it can be any word or phrase you select. At its core, a BIP39 passphrase modifies the cryptographic strategy of wallet technology. Here’s a specialized check out how it really works: https://thejillist.com/story8750322/bip39-wallet-https-linktr-ee-bip39-an-unbiased-view-of-bip-39