NIP-71: Add addressable video events (kinds 32221, 32222)

Extends NIP-71 to support addressable video events for content that may need updates after publication. This enables:

- Metadata corrections without republishing
- URL migration when hosting changes
- Preservation of imported content IDs from legacy platforms
- Platform migration tracking

Adds kinds 32221 (normal videos) and 32222 (short videos) with required 'd' tag for unique identification and optional 'origin' tag for tracking imported content.

2 files changed, 75 insertions, 0 deletions

diff --git a/71.md b/71.md
index d3b0925..2097c7e 100644
--- a/71.md
+++ b/71.md
@@ -20,6 +20,20 @@ Nothing except cavaliership and common sense prevents a _short_ video from being
 
 The format uses a _regular event_ kind `21` for _normal_ videos and `22` for _short_ videos.
 
+## Addressable Video Events
+
+For content that may need updates after publication (such as correcting metadata, descriptions, or handling URL migrations), addressable versions are available:
+
+- Kind `32221` for _addressable normal videos_
+- Kind `32222` for _addressable short videos_
+
+These addressable events follow the same format as their regular counterparts but include a `d` tag as a unique identifier and can be updated while maintaining the same addressable reference. This is particularly useful for:
+
+- Metadata corrections (descriptions, titles, tags) without republishing
+- Preservation of imported content IDs from legacy platforms
+- URL migration when hosting changes
+- Platform migration tracking
+
 The `.content` of these events is a summary or description on the video content.
 
 The primary source of video information is the `imeta` tags which is defined in [NIP-92](92.md)
@@ -71,6 +85,9 @@ The `image` tag contains a preview image (at the same resolution). Multiple `ima
 
 Additionally `service nip96` may be included to allow clients to search the authors NIP-96 server list to find the file using the hash.
 
+### Required tags for addressable events:
+* `d` - Unique identifier for this video (user-chosen string, required for kinds 32221, 32222)
+
 ### Other tags:
 * `title` (required) title of the video
 * `published_at`, for the timestamp in unix seconds (stringified) of the first time the video was published
@@ -83,6 +100,9 @@ Additionally `service nip96` may be included to allow clients to search the auth
 * `p` (optional, repeated) 32-bytes hex pubkey of a participant in the video, optional recommended relay URL
 * `r` (optional, repeated) references / links to web pages
 
+### Optional tags for imported content:
+* `origin` - Track original platform and ID: `["origin", "<platform>", "<external-id>", "<original-url>", "<optional-metadata>"]`
+
 ```jsonc
 {
   "id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
@@ -127,3 +147,56 @@ Additionally `service nip96` may be included to allow clients to search the auth
   ]
 }
 ```
+
+## Addressable Event Example
+
+```jsonc
+{
+  "id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
+  "pubkey": <32-bytes lowercase hex-encoded public key of the event creator>,
+  "created_at": <Unix timestamp in seconds>,
+  "kind": 32221 | 32222,
+  "content": "<summary / description of video>",
+  "tags": [
+    ["d", "<unique-identifier>"],
+    ["title", "<title of video>"],
+    ["published_at", "<unix timestamp>"],
+    ["alt", "<description for accessibility>"],
+
+    // video data
+    ["imeta",
+      "url https://example.com/media.mp4",
+      "m video/mp4",
+      "dim 480x480",
+      "blurhash eVF$^OI:${M{%LRjWBoLoLaeR*",
+      "image https://example.com/thumb.jpg",
+      "x 3093509d1e0bc604ff60cb9286f4cd7c781553bc8991937befaacfdc28ec5cdc"
+    ],
+
+    ["duration", <duration in seconds>],
+    ["content-warning", "<reason>"],
+
+    // origin tracking for imported content
+    ["origin", "<platform>", "<external-id>", "<original-url>", "<optional-metadata>"],
+
+    // participants
+    ["p", "<32-bytes hex of a pubkey>", "<optional recommended relay URL>"],
+
+    // hashtags
+    ["t", "<tag>"],
+    ["t", "<tag>"],
+
+    // reference links
+    ["r", "<url>"]
+  ]
+}
+```
+
+## Referencing Addressable Events
+
+To reference an addressable video:
+
+```
+["a", "32221:<pubkey>:<d-tag-value>", "<relay-url>"]  // for normal videos
+["a", "32222:<pubkey>:<d-tag-value>", "<relay-url>"]  // for short videos
+```
diff --git a/README.md b/README.md
index 397eceb..b5051b5 100644
--- a/README.md
+++ b/README.md
@@ -248,6 +248,8 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `31925`       | Calendar Event RSVP             | [52](52.md)                            |
 | `31989`       | Handler recommendation          | [89](89.md)                            |
 | `31990`       | Handler information             | [89](89.md)                            |                         |
+| `32221`       | Addressable Video Event         | [71](71.md)                            |
+| `32222`       | Addressable Short Video Event   | [71](71.md)                            |
 | `32267`       | Software Application            |                                        |                        |
 | `34550`       | Community Definition            | [72](72.md)                            |
 | `38383`       | Peer-to-peer Order events       | [69](69.md)                            |