diff --git a/js/nostr/client.js b/js/nostr/client.js
index 1a982bfb..02ffb27a 100644
--- a/js/nostr/client.js
+++ b/js/nostr/client.js
@@ -4642,6 +4642,8 @@ export class NostrClient {
     }
 
     const existingD = this.resolveEventDTag(baseEvent, originalEvent) || null;
+    const stableDTag =
+      existingD || baseEvent?.id || originalEvent?.id || null;
 
     let oldContent = {};
     try {
@@ -4656,7 +4658,7 @@ export class NostrClient {
       oldContent.videoRootId ||
       (existingD
         ? `LEGACY:${baseEvent.pubkey}:${existingD}`
-        : baseEvent.id);
+        : stableDTag || baseEvent?.id || originalEvent?.id || "");
 
     const oldIsNsfw = oldContent.isNsfw === true;
     const oldIsForKids = oldContent.isForKids === true && !oldIsNsfw;
@@ -4677,8 +4679,11 @@ export class NostrClient {
     };
 
     const tags = [["t", "video"]];
-    if (existingD) {
-      tags.push(["d", existingD]);
+    if (stableDTag) {
+      // NIP-78 requires replaceable events to publish a stable "d" tag.
+      // Legacy videos may not carry one, so reuse the prior event id to
+      // guarantee the revert stays addressable.
+      tags.push(["d", stableDTag]);
     }
 
     const event = {
diff --git a/tests/nostr/revert-video-dtag.test.mjs b/tests/nostr/revert-video-dtag.test.mjs
new file mode 100644
index 00000000..758a109c
--- /dev/null
+++ b/tests/nostr/revert-video-dtag.test.mjs
@@ -0,0 +1,127 @@
+import "../test-helpers/setup-localstorage.mjs";
+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  NostrClient,
+  setActiveSigner,
+  clearActiveSigner,
+} from "../../js/nostr.js";
+
+function createStubPool() {
+  return {
+    publish(urls, event) {
+      void urls;
+      void event;
+      return {
+        on(type, handler) {
+          if (type === "ok") {
+            handler();
+            return true;
+          }
+          if (type === "failed") {
+            return true;
+          }
+          return false;
+        },
+      };
+    },
+  };
+}
+
+test("revertVideo preserves existing d tag", async (t) => {
+  const client = new NostrClient();
+  const pubkey = "ABC123";
+  const existingD = "stable-d-tag";
+  const baseEvent = {
+    id: "event-original",
+    pubkey,
+    content: JSON.stringify({
+      version: 3,
+      videoRootId: "root-abc",
+    }),
+    tags: [
+      ["t", "video"],
+      ["d", existingD],
+    ],
+  };
+
+  const signedEvents = [];
+  const signer = {
+    type: "app",
+    pubkey,
+    signEvent: async (event) => {
+      signedEvents.push(event);
+      return { ...event, id: `signed-${signedEvents.length}` };
+    },
+  };
+
+  client.relays = ["wss://relay.one"];
+  client.pool = createStubPool();
+  client.ensureExtensionPermissions = async () => ({ ok: true });
+  client.ensureActiveSignerForPubkey = async () => signer;
+
+  setActiveSigner(signer);
+
+  t.after(() => {
+    clearActiveSigner();
+  });
+
+  const result = await client.revertVideo(baseEvent, pubkey);
+
+  assert.ok(result?.event, "revertVideo should return the signed event");
+  const signedEvent = signedEvents[0];
+  assert.ok(signedEvent, "revertVideo should sign the revert event");
+  const dTags = signedEvent.tags.filter((tag) => Array.isArray(tag) && tag[0] === "d");
+  assert.deepEqual(
+    dTags,
+    [["d", existingD]],
+    "revertVideo should preserve the existing d tag",
+  );
+});
+
+test("revertVideo falls back to original event id when d tag missing", async (t) => {
+  const client = new NostrClient();
+  const pubkey = "ABC123";
+  const baseEvent = {
+    id: "event-legacy",
+    pubkey,
+    content: JSON.stringify({
+      version: 2,
+      videoRootId: "event-legacy",
+    }),
+    tags: [["t", "video"]],
+  };
+
+  const signedEvents = [];
+  const signer = {
+    type: "app",
+    pubkey,
+    signEvent: async (event) => {
+      signedEvents.push(event);
+      return { ...event, id: `signed-${signedEvents.length}` };
+    },
+  };
+
+  client.relays = ["wss://relay.one"];
+  client.pool = createStubPool();
+  client.ensureExtensionPermissions = async () => ({ ok: true });
+  client.ensureActiveSignerForPubkey = async () => signer;
+
+  setActiveSigner(signer);
+
+  t.after(() => {
+    clearActiveSigner();
+  });
+
+  const result = await client.revertVideo(baseEvent, pubkey);
+
+  assert.ok(result?.event, "revertVideo should return the signed event");
+  const signedEvent = signedEvents[0];
+  assert.ok(signedEvent, "revertVideo should sign the revert event");
+  const dTags = signedEvent.tags.filter((tag) => Array.isArray(tag) && tag[0] === "d");
+  assert.deepEqual(
+    dTags,
+    [["d", baseEvent.id]],
+    "revertVideo should reuse the original event id for the d tag when missing",
+  );
+});