I like Pablo's suggestion: https://github.com/nostr-protocol/nips/pull/829

Keys are definitely the cornerstone here, but same is true for bitcoin, and we have a massive pile of builders solving keys for bitcoin, and there are more and more robust and user-friendly solutions coming to market.

Here is how bitcoin keys compare to nostr keys in my mind:
- you can 'migrate' from one set of bitcoin keys to the other by transferring all funds. With the suggestion above, you can do something similar on Nostr (although it's not precisely "all value" that's being transferred). It will also take lot of work for apps to support this auto-migration, and there are technical issues with that particular suggestion, but it's a good start IMO.
- you can kind of manage risks with bitcoin keys using several different wallet setups with different amounts stored. But you could do the same on nostr, having several keys with different setups dedicated to different activities. We don't have widely used tools to store many keys and switch btw accounts in signers and in the apps, nsec.app and nostr-login help here.
- you have limited damage if bitcoin keys are stolen, but on nostr it feels unlimited - thieves can broadcast with your own keys forever, they can also post fake events in the past under your old name. We will probably have to opentimestamp important stuff we publish to add safeguards against back-dated fakes. Also if the above nip is implemented well, the damage here might be reduced significantly.

This is just what comes to mind on the spot, let's discuss this further.