Bip39 Example Or for quite large safety, you can "roll your own" seed phrase with dice or maybe a calculator as offline approaches. In addition, does one rely on that the builders produced a adequately random RNG? A single easy math oversight can probably lead to all produced private keys https://livebookmarking.com/story18506954/12-word-seed-phrase-generator-with-balance-helping-the-others-realize-the-advantages-of-seed-phrase-generator