NIP-46

Bunker / Remote signing

NIP-46 describes remote signing, often called bunker-style signing. One app can ask a separate signer to approve Nostr actions, so the app you are using does not need to hold your private key directly.

This is useful when you want to use a web app but keep your key somewhere more controlled. A simple analogy is letting a bank approve a payment request without giving the shop your bank password.

Read more in the official 46.md NIP document.