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+NIP-100
+======
+
+Decentralized Stars & Reviews
+-------------------------------
+
+`draft` `optional`
+
+### Abstract
+
+This NIP defines an addressable event (kind 30016) for posting star ratings and optional text reviews of entities (products, services, sellers, locations) identified by any URI-like identifier. It replaces centralized "star & review" systems with verifiable, portable, censorship-resistant data on Nostr.
+
+### Overview
+Defines an addressable event (kind 30016) for posting star ratings (1-5) and optional text reviews of entities (products, services, sellers, locations) identified by any URI-like identifier. Replaces centralized "star & review" systems with verifiable, portable, censorship-resistant data on Nostr.
+
+### Event Structure
+```json
+{
+  "kind": 30016,
+  "tags": [
+    ["d", "<reviewed-entity-identifier>"],  // required, same as r for addressability
+    ["r", "<reviewed-entity-identifier>"],  // required, e.g. "isbn:978-3-16-148410-0", "npub:...", "shop:example.com/product/123", "geo:13.7563,100.5018"
+    ["rating", "{\"score\":4,\"max_score\":5,\"review_text\":\"Optional short summary\"}"],  // required, JSON object
+    ["title", "<short title>"],            // optional
+    ["summary", "<one-line summary>"],     // optional
+    ["image", "<image URL>"]               // optional
+  ],
+  "content": "<full review text (markdown allowed)>",
+  ...
+}
+```
+
+### Rules
+- Events are addressable per NIP-01 (kind 30016), ensuring one event per author per `d` tag value (which matches the `r` tag).
+- `d` tag MUST match the `r` tag value for addressability.
+- `rating` tag MUST contain a valid JSON object with at least `score` (positive integer, typically 1–5). `max_score` is optional (defaults to 5 if omitted). `review_text` is optional.
+- Clients MUST ignore events with invalid or missing `rating` JSON, or `score` not a positive integer ≤ `max_score`.
+- Multiple `r` tags allowed for reviewing the same entity under different identifiers (but `d` should be the primary one).
+- Relays MUST store only the latest event per combination of `kind`, `pubkey`, and `d` tag value.
+
+### Client Behavior
+- Display aggregated average stars and review list.
+- Allow filtering by verified authors or minimum reputation.
+- Support replies (kind 1) threaded under review event ID for discussions.
+
+### Querying Reviews
+Clients can query reviews using standard Nostr filters:
+- To get all reviews for an entity: `{"kinds":[30016], "#d":["<entity-identifier>"]}` or `{"kinds":[30016], "#r":["<entity-identifier>"]}`
+- To get a user's reviews: `{"kinds":[30016], "authors":["<pubkey>"]}`
+- Combine with `since`/`until` for time ranges.
+
+### Aggregation and Display
+- Clients SHOULD aggregate ratings by computing the average `score` from valid events.
+- Display review lists sorted by `created_at` (newest first).
+- Show user reputation if available (e.g., via other NIPs).
+
+### Replies and Discussions
+- Use [NIP-10](10.md) threaded replies (kind 1) referencing the review event ID for discussions.
+
+### Examples
+1. Review a product:
+```json
+{
+  "kind": 30016,
+  "tags": [
+    ["d", "shop:example.com/product/123"],
+    ["r", "shop:example.com/product/123"],
+    ["rating", "{\"score\":5,\"max_score\":5,\"review_text\":\"Excellent quality!\"}"],
+    ["title", "Great Buy"],
+    ["summary", "Highly recommend"]
+  ],
+  "content": "Detailed review text in markdown."
+}
+```
+
+2. Review a location (using default max_score of 5):
+```json
+{
+  "kind": 30016,
+  "tags": [
+    ["d", "geo:13.7563,100.5018"],
+    ["r", "geo:13.7563,100.5018"],
+    ["rating", "{\"score\":3}"]
+  ],
+  "content": "Nice place but crowded."
+}
+```
+
+3. Review with higher scale (e.g., out of 10):
+```json
+{
+  "kind": 30016,
+  "tags": [
+    ["d", "isbn:978-3-16-148410-0"],
+    ["r", "isbn:978-3-16-148410-0"],
+    ["rating", "{\"score\":8,\"max_score\":10}"]
+  ],
+  "content": "Solid read, worth the time."
+}
+```
+
+### Identifier Recommendations
+Use stable, globally unique strings:
+- Products: `isbn:…`, `gtin:…`, `shop:<domain>/product/<id>`
+- Services: `npub:…` (seller), `web:<domain>/service/<id>`
+- Places: `geo:lat,lng` or `osm:node/…`
+
+This NIP enables open, user-owned reputation layers for e-commerce, freelance platforms, and local services without gatekeepers.
diff --git a/README.md b/README.md
index ccae3aa006..fdf3745448 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 - [NIP-96: HTTP File Storage Integration](96.md) --- **unrecommended**: replaced by blossom APIs
 - [NIP-98: HTTP Auth](98.md)
 - [NIP-99: Classified Listings](99.md)
+- [NIP-100: Decentralized Stars & Reviews](100.md)
 - [NIP-A0: Voice Messages](A0.md)
 - [NIP-B0: Web Bookmarks](B0.md)
 - [NIP-B7: Blossom](B7.md)
@@ -204,6 +205,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `10012`       | Favorite relays list            | [51](51.md)                            |
 | `10013`       | Private event relay list        | [37](37.md)                            |
 | `10015`       | Interests list                  | [51](51.md)                            |
+| `30016`       | Star Ratings                    | [100](100.md)                          |
 | `10019`       | Nutzap Mint Recommendation      | [61](61.md)                            |
 | `10020`       | Media follows                   | [51](51.md)                            |
 | `10030`       | User emoji list                 | [51](51.md)                            |