Add duration & bitrate to NIP-71 (#1723)

Co-authored-by: Vitor Pamplona <vitor@vitorpamplona.com>

37.md

@@ -1,50 +1,57 @@
 NIP-37
 ======
 
-Draft Events 
-------------
+Draft Wraps
+-----------
 
 `draft` `optional`
 
-This NIP defines kind `31234` as a private wrap for drafts of any other event kind. 
+This NIP defines kind `31234` as an encrypted storage for unsigned draft events of any other kind. 
 
-The draft event is JSON-stringified, [NIP44-encrypted](44.md) to the signer's public key and placed inside the `.content` of the event.
+The draft is JSON-stringified, [NIP44-encrypted](44.md) to the signer's public key and placed inside the `.content`.
 
-An additional `k` tag identifies the kind of the draft event. 
+`k` tags identify the kind of the draft. 
 
 ```js
 {
   "kind": 31234,
   "tags": [
     ["d", "<identifier>"],
-    ["k", "<kind of the draft event>"],
-    ["e", "<anchor event event id>", "<relay-url>"],
-    ["a", "<anchor event address>", "<relay-url>"],
+    ["k", "<kind of the draft event>"], // required
+    ["expiration", "now + 90 days"] // recommended
   ],
   "content": nip44Encrypt(JSON.stringify(draft_event)),
   // other fields
 }
 ```
 
-A blanked `.content` means this draft has been deleted by a client but relays still have the event. 
+A blanked `.content` field signals that the draft has been deleted. 
 
-Tags `e` and `a` identify one or more anchor events, such as parent events on replies.   
+[NIP-40](40.md) `expiration` tags are recommended. 
+
+Clients SHOULD publish kind `31234` events to relays listed on kind `10013` below.
 
 ## Relay List for Private Content
 
-Kind `10013` indicates the user's preferred relays to store private events like Drafts. The event MUST include a list of `relay` URLs in private tags. Private tags are JSON Stringified, NIP-44-encrypted to the signer's keys and placed inside the .content of the event.
+Kind `10013` indicates the user's preferred relays to store private events like Draft Wraps. 
+
+The event MUST include a list of `relay` URLs in private tags. Private tags are JSON Stringified, [NIP44-encrypted](44.md) to the signer's keys and placed inside the .content of the event.
 
 ```js
 {
   "kind": 10013,
   "tags": [],
-  "content": nip44Encrypt(JSON.stringify([
-    ["relay", "wss://myrelay.mydomain.com"]
-  ]))
+  "content": nip44Encrypt(
+    JSON.stringify(
+      [
+        ["relay", "wss://myrelay.mydomain.com"]
+      ]
+    )
+  )
   //...other fields
 }
 ```
 
-Relays listed in this event SHOULD be authed and only allow downloads to events signed by the authed user.
+It's recommended that Private Storage relays SHOULD be [NIP-42](42.md)-authed and only allow downloads of events signed by the authed user.
 
-Clients SHOULD publish kind `10013` events to the author's [NIP-65](65.md) `write` relays. 
+Clients MUST publish kind `10013` events to the author's [NIP-65](65.md) `write` relays. 

71.md

@@ -26,6 +26,11 @@ The primary source of video information is the `imeta` tags which is defined in
 
 Each `imeta` tag can be used to specify a variant of the video by the `dim` & `m` properties.
 
+This NIP defines the following additional `imeta` properties aside form those listen in [NIP-92](92.md) & [NIP-94](94.md):
+
+* `duration` (recommended) the duration of the video/audio in seconds (floating point number)
+* `bitrate` (recommended) the average bitrate of the video/audio in bits/sec
+
 Example:
 ```json
 [
@@ -39,6 +44,8 @@ Example:
     "fallback https://myotherserver.com/1080/12345.mp4",
     "fallback https://andanotherserver.com/1080/12345.mp4",
     "service nip96",
+    "bitrate 3000000",
+    "duration 29.223"
   ],
   ["imeta",
     "dim 1280x720",
@@ -50,6 +57,8 @@ Example:
     "fallback https://myotherserver.com/720/12345.mp4",
     "fallback https://andanotherserver.com/720/12345.mp4",
     "service nip96",
+    "bitrate 2000000",
+    "duration 29.24"
   ],
   ["imeta",
     "dim 1280x720",
@@ -61,6 +70,7 @@ Example:
     "fallback https://myotherserver.com/720/12345.m3u8",
     "fallback https://andanotherserver.com/720/12345.m3u8",
     "service nip96",
+    "duration 29.21"
   ],
 ]
 ```
@@ -74,7 +84,6 @@ Additionally `service nip96` may be included to allow clients to search the auth
 ### 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
-* `duration` (optional) video duration in seconds
 * `text-track` (optional, repeated) link to WebVTT file for video, type of supplementary information (captions/subtitles/chapters/metadata), optional language code
 * `content-warning` (optional) warning about content of NSFW video
 * `alt` (optional) description for accessibility
@@ -108,7 +117,6 @@ Additionally `service nip96` may be included to allow clients to search the auth
       "service nip96",
     ],
 
-    ["duration", "<duration of video in seconds>"],
     ["text-track", "<encoded `kind 6000` event>", "<recommended relay urls>"],
     ["content-warning", "<reason>"],
     ["segment", <start>, <end>, "<title>", "<thumbnail URL>"],