NIP-75: Zap Goals (#757)

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+# NIP-75
+
+## Zap Goals
+
+`draft` `optional` `author:verbiricha`
+
+This NIP defines an event for creating fundraising goals. Users can contribute funds towards the goal by zapping the goal event.
+
+## Nostr Event
+
+A `kind:9041` event is used.
+
+The `.content` contains a human-readable description of the goal.
+
+The following tags are defined as REQUIRED.
+
+- `amount` - target amount in milisats.
+- `relays` - a list of relays the zaps to this goal will be sent to and tallied from.
+
+Example event:
+
+```json
+{
+  "kind": 9041,
+  "tags": [
+    ["relays", "wss://alicerelay.example.com", "wss://bobrelay.example.com", ...],
+    ["amount", "210000"],
+  ],
+  "content": "Nostrasia travel expenses",
+  ...other fields
+```
+
+The following tags are OPTIONAL.
+
+- `closed_at` - timestamp for determining which zaps are included in the tally. Zap receipts published after the `closed_at` timestamp SHOULD NOT count towards the goal progress.
+
+```json
+{
+  "kind": 9041,
+  "tags": [
+    ["relays", "wss://alicerelay.example.com", "wss://bobrelay.example.com", ...],
+    ["amount", "210000"],
+    ["closed_at", "<unix timestamp in seconds>"],
+  ],
+  "content": "Nostrasia travel expenses",
+  ...other fields
+```
+
+The goal MAY include an `r` or `a` tag linking to a URL or parameterized replaceable event.
+
+The goal MAY include multiple beneficiary pubkeys by specifying [`zap` tags](57.md#appendix-g-zap-tag-on-other-events).
+
+Parameterized replaceable events can link to a goal by using a `goal` tag specifying the event id and an optional relay hint.
+
+```json
+{
+  "kind": 3XXXX,
+  "tags": [
+    ...
+    ["goal", "<event id>", "<Relay URL (optional)>"],
+  ],
+  ...other fields
+```
+
+## Client behavior
+
+Clients MAY display funding goals on user profiles.
+
+When zapping a goal event, clients MUST include the relays in the `relays` tag of the goal event in the zap request `relays` tag.
+
+When zapping a parameterized replaceable event with a `goal` tag, clients SHOULD tag the goal event id in the `e` tag of the zap request.
+
+## Use cases
+
+- Fundraising clients
+- Adding funding goals to events such as long form posts, badges or live streams