Bip39 Github. The passphrase is not really picked from the predefined list of 2048 words – it might be any word or phrase you choose. What constitutes a "very good wallet" is one which has obvious, very easy to access documentation on supported BIP benchmarks, derivation paths, and recovery processes. https://gorillasocialwork.com/story20378474/bip39-wallet-https-linktr-ee-bip39-bip39-generator-an-overview