diff --git a/src/plugins/github/__snapshots__/relationalView.test.js.snap b/src/plugins/github/__snapshots__/relationalView.test.js.snap
index f409bea..5029aab 100644
--- a/src/plugins/github/__snapshots__/relationalView.test.js.snap
+++ b/src/plugins/github/__snapshots__/relationalView.test.js.snap
@@ -824,3 +824,48 @@ Array [
   },
 ]
 `;
+
+exports[`plugins/github/relationalView urlReferenceMap should match example snapshot 1`] = `
+Array [
+  Array [
+    "https://github.com/credbot",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"USERLIKE\\",\\"BOT\\",\\"credbot\\"]",
+  ],
+  Array [
+    "https://github.com/decentralion",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"USERLIKE\\",\\"USER\\",\\"decentralion\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"REPO\\",\\"sourcecred-test\\",\\"example-github\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/commit/0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"COMMIT\\",\\"MDY6Q29tbWl0MTIzMjU1MDA2OjBhMjIzMzQ2YjRlNmRlYzAxMjdiMWU2YWE4OTJjNGVlMDQyNGI2NmE=\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/issues/1",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"ISSUE\\",\\"sourcecred-test\\",\\"example-github\\",\\"1\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/issues/2#issuecomment-373768703",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"COMMENT\\",\\"ISSUE\\",\\"sourcecred-test\\",\\"example-github\\",\\"2\\",\\"373768703\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/pull/3",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"PULL\\",\\"sourcecred-test\\",\\"example-github\\",\\"3\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/pull/3#issuecomment-369162222",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"COMMENT\\",\\"PULL\\",\\"sourcecred-test\\",\\"example-github\\",\\"3\\",\\"369162222\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/pull/5#discussion_r171460198",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"COMMENT\\",\\"REVIEW\\",\\"sourcecred-test\\",\\"example-github\\",\\"5\\",\\"100313899\\",\\"171460198\\"]",
+  ],
+  Array [
+    "https://github.com/sourcecred-test/example-github/pull/5#pullrequestreview-100313899",
+    "NodeAddress[\\"sourcecred\\",\\"github\\",\\"REVIEW\\",\\"sourcecred-test\\",\\"example-github\\",\\"5\\",\\"100313899\\"]",
+  ],
+]
+`;
diff --git a/src/plugins/github/relationalView.js b/src/plugins/github/relationalView.js
index 9d7122c..f5f78f8 100644
--- a/src/plugins/github/relationalView.js
+++ b/src/plugins/github/relationalView.js
@@ -1,5 +1,7 @@
 // @flow
 
+import {type URL} from "../../core/references";
+import {NodeAddress, type NodeAddressT} from "../../core/graph";
 import {toCompat, fromCompat, type Compatible} from "../../util/compat";
 import stringify from "json-stable-stringify";
 import {parseReferences} from "./parseReferences";
@@ -515,6 +517,30 @@ export class RelationalView {
     }
   }
 
+  /**
+   * Creates a Map<URL, NodeAddressT> for each ReferentEntity in this view.
+   * Note: duplicates are accepted within one view. However for any URL, the
+   * corresponding N.RawAddress should be the same, or we'll throw an error.
+   */
+  urlReferenceMap(): Map<URL, NodeAddressT> {
+    const refToAddress: Map<URL, NodeAddressT> = new Map();
+    for (const e: ReferentEntity of this.referentEntities()) {
+      const addr = N.toRaw(e.address());
+      const url = e.url();
+      const existing = refToAddress.get(url);
+      if (existing && existing != addr) {
+        throw new Error(dedent`\
+          An entry for ${url} already existed, but with a different NodeAddressT.
+          This is probably a bug with SourceCred. Please report it on GitHub.
+          Old: ${NodeAddress.toString(existing)}
+          New: ${NodeAddress.toString(addr)}
+        `);
+      }
+      refToAddress.set(url, addr);
+    }
+    return refToAddress;
+  }
+
   _addReferences() {
     // TODO(perf): _addReferences regenerates all refs from scratch
     this._mapReferences = new Map();
diff --git a/src/plugins/github/relationalView.test.js b/src/plugins/github/relationalView.test.js
index 6231a54..167e883 100644
--- a/src/plugins/github/relationalView.test.js
+++ b/src/plugins/github/relationalView.test.js
@@ -1,5 +1,6 @@
 // @flow
 
+import {NodeAddress} from "../../core/graph";
 import * as R from "./relationalView";
 import * as N from "./nodes";
 import {exampleRepository, exampleRelationalView} from "./example/example";
@@ -390,6 +391,40 @@ describe("plugins/github/relationalView", () => {
     });
   });
 
+  describe("urlReferenceMap", () => {
+    it("should match example snapshot", () => {
+      // Given
+      const rv = exampleRelationalView();
+
+      // When
+      const map = rv.urlReferenceMap();
+
+      // Then
+      const snapshotMapWith = (urls: string[]): [string, ?string][] => {
+        // Sort, for less test flakes.
+        // Remove null bytes from NodeAddress.
+        // Generate selective [key, value] tuples.
+        urls.sort();
+        const maybeString = (a) => (a ? NodeAddress.toString(a) : a);
+        return urls.map((url) => [url, maybeString(map.get(url))]);
+      };
+      expect(
+        snapshotMapWith([
+          "https://github.com/decentralion",
+          "https://github.com/credbot",
+          "https://github.com/sourcecred-test/example-github",
+          "https://github.com/sourcecred-test/example-github/issues/1",
+          "https://github.com/sourcecred-test/example-github/pull/3",
+          "https://github.com/sourcecred-test/example-github/pull/5#pullrequestreview-100313899",
+          "https://github.com/sourcecred-test/example-github/issues/2#issuecomment-373768703",
+          "https://github.com/sourcecred-test/example-github/pull/3#issuecomment-369162222",
+          "https://github.com/sourcecred-test/example-github/pull/5#discussion_r171460198",
+          "https://github.com/sourcecred-test/example-github/commit/0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+        ])
+      ).toMatchSnapshot();
+    });
+  });
+
   describe("expectAllNonNull", () => {
     it("returns non-null elements unscathed, with no warnings", () => {
       jest.spyOn(console, "warn").mockImplementation(() => {});