Bip39 Or for really higher stability, you could possibly "roll your individual" seed phrase with dice or perhaps a calculator as offline methods. One set of mnemonic can be employed to create several addresses. This method of producing account was introduced in BIP32 & BIP39 very long time ago. Here, https://bookmarkquotes.com/story18725658/bip39-meaning-the-definitive-guide-to-bip39-phrase