Ledger Bip39 Passphrase Or for quite large safety, you can "roll your own" seed phrase with dice or a calculator as offline solutions. Just one set of mnemonic can be used to generate many addresses. This technique of making account was introduced in BIP32 & BIP39 very long time ago. https://socialupme.com/story4036793/bip39-mnemonic-words-indicators-on-seed-phrase-generator-you-should-know