add "communities" list and examples.

1 files changed, 38 insertions, 6 deletions

diff --git a/51.md b/51.md
index c74487f..3ac8995 100644
--- a/51.md
+++ b/51.md
@@ -16,9 +16,41 @@ The kinds `30000` and `30001` have been reserved for generic lists. These must b
 
 ## Standard lists
 
-| name           | kind  | "d" tag        | description                                                                                   | expected tag items                                |
-| ---            | ---   | ---            | ---                                                                                           | ---                                               |
-| Muted list     | 30000 | `"mute"`       | things the user doesn't want to see in their feeds                                            | `"p"` (pubkeys), `"t"` (hashtags)                 |
-| Bookmarks list | 30001 | `"bookmark"`   | things the user intends to save for the future                                                | `"e"` (kind:1 notes), `"a"` (kind:30023 articles) |
-| Pin list       | 30001 | `"pin"`        | events the user intends to showcase in their profile page                                     | `"e"` (kind:1 notes)                              |
-| Relay sets     | 30002 | (user-defined) | user-defined relay groups the user can easily pick and choose from during variadic operations | `"relay"` (relay URLs)                            |
+| name             | kind  | "d" tag         | description                                                                                   | expected tag items                                |
+| ---              | ---   | ---             | ---                                                                                           | ---                                               |
+| Mute list       | 30000 | `"mute"`        | things the user doesn't want to see in their feeds                                            | `"p"` (pubkeys), `"t"` (hashtags)                 |
+| Bookmarks list   | 30001 | `"bookmark"`    | things the user intends to save for the future                                                | `"e"` (kind:1 notes), `"a"` (kind:30023 articles) |
+| Pin list         | 30001 | `"pin"`         | events the user intends to showcase in their profile page                                     | `"e"` (kind:1 notes)                              |
+| Communities list | 30001 | `"communities"` | [NIP-72](72.md) communities the user belongs to                                               | `"a"` (kind:34550 community definitions)          |
+| Relay sets       | 30002 | (user-defined)  | user-defined relay groups the user can easily pick and choose from during variadic operations | `"relay"` (relay URLs)                            |
+
+## Examples
+
+### A _Mute list_ with some public items and some encrypted items
+
+```json
+{
+  "id": "a92a316b75e44cfdc19986c634049158d4206fcc0b7b9c7ccbcdabe28beebcd0",
+  "pubkey": "854043ae8f1f97430ca8c1f1a090bdde6488bd5115c7a45307a2a212750ae4cb",
+  "created_at": 1699597889,
+  "kind": 30000,
+  "tags": [
+    ["d", "mute"],
+    ["p", "07caba282f76441955b695551c3c5c742e5b9202a3784780f8086fdcdc1da3a9"],
+    ["p", "a55c15f5e41d5aebd236eca5e0142789c5385703f1a7485aa4b38d94fd18dcc4"]
+  ],
+  "content": "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?iv=S3rFeFr1gsYqmQA7bNnNTQ==",
+  "sig": "1173822c53261f8cffe7efbf43ba4a97a9198b3e402c2a1df130f42a8985a2d0d3430f4de350db184141e45ca844ab4e5364ea80f11d720e36357e1853dba6ca"
+}
+```
+
+## Encryption process pseudocode
+
+```scala
+val private_items = [
+  ["p", "07caba282f76441955b695551c3c5c742e5b9202a3784780f8086fdcdc1da3a9"],
+  ["a", "a55c15f5e41d5aebd236eca5e0142789c5385703f1a7485aa4b38d94fd18dcc4"],
+]
+val base64blob = nip04.encrypt(json.encode_to_string(private_items))
+event.content = base64blob
+```