nips/46.md

NIP-46

Nostr Connect

draft optional author:tiero author:giowe author:vforvalerio87 depends:04 depends:26

Rationale

Private keys should be exposed to as few systems - apps, operating systems, devices - as possible as each system adds to the attack surface.

Entering private keys can also be annoying and requires exposing them to even more systems such as the operating system's clipboard that might be monitored by malicious apps.

Terms

• App: Nostr app on any platform that requires to act on behalf of a nostr account.
• Signer: Nostr app that holds the private key of a nostr account and can sign on its behalf.

TL;DR

App and Signer sends ephemeral encrypted messages to each other using kind 24133, using a relay of choice.

App prompts the Signer to do things such as fetching the public key or signing events.

The content field must be an encrypted JSONRPC-ish request or response.

Signer Protocol

Messages

Request

{
  "id": <random_string>,
  "method": <one_of_the_methods>,
  "params": [<anything>, <else>]
}

Response

{
  "id": <request_id>,
  "result": <anything>,
  "error": <reason>
}

Methods

Mandatory

These are mandatory methods the remote signer app MUST implement:

• describe
  • params []
  • result ["describe", "get_public_key", "sign_event", "connect", "disconnect", "delegate", ...]
• get_public_key
  • params []
  • result pubkey
• sign_event
  • params [event]
  • result event_with_signature

optional

• connect
  • params [pubkey]
• disconnect
  • params []
• delegate
  • params [delegatee, { kind: number, since: number, until: number }]
  • result { from: string, to: string, cond: string, sig: string }
• get_relays
  • params []
  • result { [url: string]: {read: boolean, write: boolean} }
• nip04_encrypt
  • params [pubkey, plaintext]
  • result nip4 ciphertext
• nip04_decrypt
  • params [pubkey, nip4 ciphertext]
  • result [plaintext]

NOTICE: pubkey and signature are hex-encoded strings.

Nostr Connect URI

Signer discovers App by scanning a QR code, clicking on a deep link or copy-pasting an URI.

The App generates a special URI with prefix nostrconnect:// and base path the hex-encoded pubkey with the following querystring parameters URL encoded

• relay URL of the relay of choice where the App is connected and the Signer must send and listen for messages.
• metadata metadata JSON of the App
  • name human-readable name of the App
  • url (optional) URL of the website requesting the connection
  • description (optional) description of the App
  • icons (optional) array of URLs for icons of the App.

JavaScript

const uri = `nostrconnect://<pubkey>?relay=${encodeURIComponent("wss://relay.damus.io")}&metadata=${encodeURIComponent(JSON.stringify({"name": "Example"}))}`

Example

nostrconnect://b889ff5b1513b641e2a139f661a661364979c5beee91842f8f0ef42ab558e9d4?relay=wss%3A%2F%2Frelay.damus.io&metadata=%7B%22name%22%3A%22Example%22%7D

Flows

The content field contains encrypted message as specified by NIP04. The kind chosen is 24133.

Connect

1. User clicks on "Connect" button on a website or scan it with a QR code
2. It will show an URI to open a "nostr connect" enabled Signer
3. In the URI there is a pubkey of the App ie. nostrconnect://<pubkey>&relay=<relay>&metadata=<metadata>
4. The Signer will send a message to ACK the connect request, along with his public key

Disconnect (from App)

1. User clicks on "Disconnect" button on the App
2. The App will send a message to the Signer with a disconnect request
3. The Signer will send a message to ACK the disconnect request

Disconnect (from Signer)

1. User clicks on "Disconnect" button on the Signer
2. The Signer will send a message to the App with a disconnect request

Get Public Key

1. The App will send a message to the Signer with a get_public_key request
2. The Signer will send back a message with the public key as a response to the get_public_key request

Sign Event

1. The App will send a message to the Signer with a sign_event request along with the event to be signed
2. The Signer will show a popup to the user to inspect the event and sign it
3. The Signer will send back a message with the event including the id and the schnorr signature as a response to the sign_event request

Delegate

1. The App will send a message with metadata to the Signer with a delegate request along with the conditions query string and the pubkey of the App to be delegated.
2. The Signer will show a popup to the user to delegate the App to sign on his behalf
3. The Signer will send back a message with the signed NIP-26 delegation token or reject it