NIP-63
======

Signed Filters
--------------

`draft` `optional`

This NIP declares the use of event kind `33012` to represent one or more Nostr filters. 

The `d` tag represents the subscription id and the `filter` tag contains the JSON-stringified [NIP-01](01.md) filter. 

```js
{
  "kind": 33012,
  "tags": [
    ["d", "<subscription_id>"],
    ["relay", "<relay>"],
    ["filter", "<filter1>"],
    ["filter", "<filter2>"],
    ["expiration", "<unix timestamp>"],
  ],
  "content": "",
  // ...other fields
}
```

They are submitted to supporting relays via `SREQ` command, with the following format: 

```js
["SREQ", <signed kind-33012>]
```

Supporting relays interpret the `filter` tags of this event in the same way they do with `REQ` while automatically authenticating the signer. 

Relays MAY reject these filters based on `created_at`. 

An expiration tag MAY be used to limit the reuse of the filter. 

## Motivation

The goal is to be able to support `AUTH` from multiple users in the same connection. As a side effect, this approach removes the `AUTH` round trip. 

Trusted proxies can use these event types to query relays on behalf of the user.