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NIP 67: Nostr Wallet Auth
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67.md
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NIP-67
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======
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Nostr Wallet Auth
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--------------------
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`draft` `optional`
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## Rationale
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[Nostr Wallet Connect](47.md) is a protocol for talking to a lightning wallet over nostr. It is great but hinges on
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having the user copy-paste a wallet connection URI into the app they wish to connect with. This can be a UX hurdle and
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often has the user handling sensitive information that they may not understand.
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As well, Nostr Wallet Connect has lots of different functions that a wallet may or may not support or an app may or may
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not need. This either runs into silent failures or requires the user to understand what functions their wallet supports
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and what functions the app needs.
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Finally, Nostr Wallet Connect requires the wallet to generate both key pairs and the app to use these. This limits the
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key management strategies that an app can use and often leads to suboptimal key management.
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This NIP proposes a new protocol that solves these problems by having the wallet and app generate the parameters for a
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NWC connection together. This URI is then used to connect the wallet and app.
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## Terms
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- **app**: Nostr app on any platform that wants to permissioned access to a user's lightning wallet.
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- **wallet**: A nostr wallet connect capable lightning wallet that the user wants to connect to the app.
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## Theory of Operation
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1. The user wants to connect their wallet to an app. The app provides a QR code or other means of connecting to the app.
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The QR code contains a `nostr+walletauth://` URI that contains the app's public key, the relay to communicate over,
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and a list of functions that the app requires.
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2. The user scans the QR code and their wallet prompts them the required functions and asks them to confirm that they
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want to connect to the app.
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3. On confirmation, the wallet generates a new key pair and sends the public key to the app in a confirmation event.
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4. With the combination of both keys, the wallet and the app both will generate the same connection URI. They can now
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use NWC to communicate.
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## Specification
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### URI Format
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The **app** generates this connection URI with protocol `nostr+walletauth:` and base path it's hex-encoded `pubkey`
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with the following query string parameters:
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- `relay` Required. URL of the relay where the **app** is connected and will be listening for events. May be
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more than one.
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- `secret` Required. A random identifier that the **wallet** will use to identify the connection. Without this the
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**app** cannot authenticate they are receiving a message from the user they want, it could be an attacker just sending
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kind `33194` events to the **app**. This should be unique for each connection. This is not a key and should be
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different for every new URI.
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- `required_commands` Required. A space-separated list of commands that the **app** requires from the **wallet**. The
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**wallet** MUST NOT connect if it does not support all of these permissions.
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- `optional_commands` Optional. A space-separated list of commands that the **wallet** can enable to add additional
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functionality. The **wallet** MAY ignore these.
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- `budget` Optional. A budget that the **wallet** will use to limit the amount of funds that the **app** can spend.
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The **app** MUST NOT spend more than this amount. The budget is a string of the form `max_amount/period`.
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The `period` is one of `daily`, `weekly`, `monthly`, `yearly`. The `max_amount` is a satoshi amount.
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- `identity` Optional. The hex-encoded `pubkey` of the *app* that the **wallet** is connecting to. This is used to
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for the wallet to display to the user. The **wallet** MAY ignore this.
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#### Example URI
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```sh
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nostr+walletauth://b889ff5b1513b641e2a139f661a661364979c5beee91842f8f0ef42ab558e9d4?relay=wss%3A%2F%2Frelay.damus.io&secret=b8a30fafa48d4795b6c0eec169a383de&required_commands=pay_invoice%20pay_keysend%20make_invoice%20lookup_invoice&optional_commands=list_transactions&budget=10000%2Fdaily
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```
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### Event
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This NIP only uses one event kind `33194`. We use a parameterized replaceable event to allow for the wallet and app to
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renegotiate the connection if needed and to allow for the wallet being able to look up the connection details later.
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The event SHOULD contain one `d` tag, containing the public key of the app from the URI.
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The content of the event is encrypted with [NIP04](04.md), and should be a JSON structure as follows:
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```jsonc
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{
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"secret": "b8a30fafa48d4795b6c0eec169a383de", // string, the secret from the URI
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"commands": [ // array of strings, commands that the wallet agrees to support
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"pay_invoice",
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"pay_keysend",
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"make_invoice",
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"lookup_invoice",
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"list_transactions",
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],
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"relay": "wss://relay.damus.io", // Optional string, alternative relay that the wallet will use
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"lud16": "user@example.com", // Optional string, user's lightning address
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}
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```
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After the user approves the connection, the wallet should send this event to the **app**.
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The *app* should validate that the `secret` matches the one in the URI and that the `commands` are a subset of the
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`required_commands` and `optional_commands` from the URI. If the `relay` is present, the *app* should use that instead
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of the one from the URI.
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The wallet and app should both then have all the necessary information be able to communicate using NWC. The app will
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have the wallet's key from the event's pubkey. The wallet will have the app's key from the URI.
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@ -66,6 +66,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
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- [NIP-57: Lightning Zaps](57.md)
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- [NIP-58: Badges](58.md)
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- [NIP-65: Relay List Metadata](65.md)
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- [NIP-67: Wallet Auth](67.md)
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- [NIP-72: Moderated Communities](72.md)
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- [NIP-75: Zap Goals](75.md)
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- [NIP-78: Application-specific data](78.md)
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@ -155,6 +156,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
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| `31925` | Calendar Event RSVP | [52](52.md) |
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| `31989` | Handler recommendation | [89](89.md) |
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| `31990` | Handler information | [89](89.md) |
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| `33194` | Nostr Wallet Auth | [49](49.md) |
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| `34550` | Community Definition | [72](72.md) |
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[nostrocket]: https://github.com/nostrocket/NIPS/blob/main/Problems.md
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