Bip 39 Word List Or for very higher security, you could potentially "roll your own private" seed phrase with dice or possibly a calculator as offline procedures. A person list of mnemonic can be used to build several addresses. This technique of generating account was launched in BIP32 & BIP39 https://prbookmarkingwebsites.com/story21594278/bip39-one-the-definitive-guide-to-bip39-phrase