Just ask ai

Pinned notes to your profile are **Kind 10001**, defined in **NIP-51** (Lists). Kind 10001 is described as "Pinned notes" — events the user intends to showcase on their profile page, using `"e"` tags to reference kind:1 notes. [GitHub](https://github.com/nostr-protocol/nips/blob/master/51.md) It's a standard replaceable event, meaning you can only have one pinned notes list per pubkey, and it gets replaced whenever you update it. The notes you want to pin are listed as `"e"` tags within the event.

That would be NIP-51 and kind 10001. @Nostria supports pinning, shows the last 3 pins on your profile timeline. You can pin using the context menu ("...") on your own events to pin them, quick and easy. https://www.nostria.app/