I totally forgot to mention in my talks at #[0] that you can derive a Nostr key from a BIP-39 mnemonic backup phrase.

* You (or more likely your Nostr client app) generates a new mnemonic backup.

* Write it down and protect it just like a Bitcoin seed.

* Client app derives your Nostr key from that seed.

#[1], #[2], #[3], #[4] for app-generated Nostr keys, it'd be nice to go through NIP-06 derivation (`m/44'/1237'/0'/0/0`) and provide the mnemonic as their backup.

Eventually when we get keys out of browsers, we'll want more robust backup solutions. May as well piggy back on what's already out there (e.g. steel plates) for Bitcoin.