Add docs for querying Rights history

README.md

@@ -343,3 +343,36 @@ conform to the [user model](#create-users).
 To check if your POST was successful, follow the steps in [registering a
 manifestation](#was-my-post-to-manifestations-successful) and use the returned
 Right's data instead.
+
+
+### Querying the ownership history of a Right
+
+The ownership history of a Right is represented as an time-series array of
+ownership events (sorted from the initial creation of the entity), each in the
+form of:
+
+```json
+{
+    "user": {
+        "publicKey": "<public key of the owner>",
+        "privateKey": null
+    },
+    "refId": "<transaction id of the transaction detailing the ownership event>"
+}
+```
+
+Note that, as in the recipient (`to`) of a Rights transfer, the returned user
+models only contain their public information.
+
+```
+GET /api/v1/rights/<ID of an existing right>
+
+RETURNS:
+[{
+    "user": {
+        "publicKey": "<public key of the owner>",
+        "privateKey": null
+    },
+    "refId": "<transaction id of the transaction detailing the ownership event>"
+}, ...]
+```