diff --git a/js/nostr.js b/js/nostr.js
index 1c2b412e..4746aaa2 100644
--- a/js/nostr.js
+++ b/js/nostr.js
@@ -4,7 +4,23 @@
 // facades. Prefer importing from the facades directly in new modules so the
 // wiring between the default client and helper layers stays explicit.
 
-export { nostrClient, requestDefaultExtensionPermissions } from "./nostrClientFacade.js";
+import {
+  nostrClient as defaultNostrClient,
+  requestDefaultExtensionPermissions,
+} from "./nostrClientFacade.js";
+
+export { requestDefaultExtensionPermissions };
+export { defaultNostrClient as nostrClient };
+
+export const publishVideoReaction = (...args) => {
+  if (
+    !defaultNostrClient ||
+    typeof defaultNostrClient.publishVideoReaction !== "function"
+  ) {
+    throw new Error("Video reaction publishing is unavailable in this build.");
+  }
+  return defaultNostrClient.publishVideoReaction(...args);
+};
 
 export {
   __testExports,
diff --git a/js/nostr/client.js b/js/nostr/client.js
index 97c00b16..b73bd5bc 100644
--- a/js/nostr/client.js
+++ b/js/nostr/client.js
@@ -52,6 +52,7 @@ import {
   publishViewEvent as publishViewEventForClient,
   recordVideoView as recordVideoViewForClient,
 } from "./viewEvents.js";
+import { publishVideoReaction as publishVideoReactionForClient } from "./reactionEvents.js";
 import {
   publishEventToRelay,
   publishEventToRelays,
@@ -2747,6 +2748,15 @@ export class NostrClient {
     });
   }
 
+  async publishVideoReaction(pointer, options = {}) {
+    return publishVideoReactionForClient(this, pointer, options, {
+      resolveActiveSigner,
+      shouldRequestExtensionPermissions,
+      signEventWithPrivateKey,
+      DEFAULT_NIP07_PERMISSION_METHODS,
+    });
+  }
+
   async recordVideoView(videoPointer, options = {}) {
     return recordVideoViewForClient(this, videoPointer, options, {
       resolveActiveSigner,
diff --git a/js/nostr/index.js b/js/nostr/index.js
index 7ace6392..0bf16db5 100644
--- a/js/nostr/index.js
+++ b/js/nostr/index.js
@@ -55,3 +55,5 @@ export {
   publishViewEvent,
   recordVideoView,
 } from "./viewEvents.js";
+
+export { publishVideoReaction } from "./reactionEvents.js";
diff --git a/js/nostr/reactionEvents.js b/js/nostr/reactionEvents.js
new file mode 100644
index 00000000..f59d1aaa
--- /dev/null
+++ b/js/nostr/reactionEvents.js
@@ -0,0 +1,170 @@
+import { buildReactionEvent } from "../nostrEventSchemas.js";
+import { publishEventToRelay } from "../nostrPublish.js";
+import { RELAY_URLS } from "./toolkit.js";
+import { normalizePointerInput } from "./watchHistory.js";
+import { devLogger, userLogger } from "../utils/logger.js";
+
+function sanitizeRelayList(primary, fallback) {
+  if (Array.isArray(primary) && primary.length) {
+    return primary;
+  }
+  if (Array.isArray(fallback) && fallback.length) {
+    return fallback;
+  }
+  return RELAY_URLS;
+}
+
+export async function publishVideoReaction(
+  client,
+  pointerInput,
+  options = {},
+  {
+    resolveActiveSigner,
+    shouldRequestExtensionPermissions,
+    signEventWithPrivateKey,
+    DEFAULT_NIP07_PERMISSION_METHODS,
+  }
+) {
+  if (!client?.pool) {
+    return { ok: false, error: "nostr-uninitialized" };
+  }
+
+  const pointer = normalizePointerInput(pointerInput);
+  if (!pointer) {
+    return { ok: false, error: "invalid-pointer" };
+  }
+
+  const actorPubkey = await client.ensureSessionActor();
+  if (!actorPubkey) {
+    return { ok: false, error: "missing-actor" };
+  }
+
+  const createdAt =
+    typeof options.created_at === "number" && options.created_at > 0
+      ? Math.floor(options.created_at)
+      : Math.floor(Date.now() / 1000);
+
+  const additionalTags = Array.isArray(options.additionalTags)
+    ? options.additionalTags.filter(
+        (tag) => Array.isArray(tag) && typeof tag[0] === "string"
+      )
+    : [];
+
+  const pointerTag =
+    pointer.type === "a"
+      ? pointer.relay
+        ? ["a", pointer.value, pointer.relay]
+        : ["a", pointer.value]
+      : pointer.relay
+      ? ["e", pointer.value, pointer.relay]
+      : ["e", pointer.value];
+
+  let content = "+";
+  if (typeof options.content === "string") {
+    content = options.content;
+  } else if (
+    options.content &&
+    typeof options.content === "object" &&
+    !Array.isArray(options.content)
+  ) {
+    try {
+      content = JSON.stringify(options.content);
+    } catch (error) {
+      devLogger.warn("[nostr] Failed to serialize custom reaction content:", error);
+      content = "+";
+    }
+  } else if (options.content !== undefined && options.content !== null) {
+    content = String(options.content);
+  }
+
+  const event = buildReactionEvent({
+    pubkey: actorPubkey,
+    created_at: createdAt,
+    pointerValue: pointer.value,
+    pointerTag,
+    additionalTags,
+    content,
+  });
+
+  let signedEvent = null;
+
+  const normalizedActor =
+    typeof actorPubkey === "string" ? actorPubkey.toLowerCase() : "";
+  const normalizedLogged =
+    typeof client.pubkey === "string" ? client.pubkey.toLowerCase() : "";
+  const signer = resolveActiveSigner(actorPubkey);
+  const canUseActiveSigner =
+    normalizedActor &&
+    normalizedActor === normalizedLogged &&
+    signer &&
+    typeof signer.signEvent === "function";
+
+  if (canUseActiveSigner) {
+    let permissionResult = { ok: true };
+    if (shouldRequestExtensionPermissions(signer)) {
+      permissionResult = await client.ensureExtensionPermissions(
+        DEFAULT_NIP07_PERMISSION_METHODS
+      );
+    }
+    if (permissionResult.ok) {
+      try {
+        signedEvent = await signer.signEvent(event);
+      } catch (error) {
+        userLogger.warn(
+          "[nostr] Failed to sign reaction event with active signer:",
+          error,
+        );
+        return { ok: false, error: "signing-failed", details: error };
+      }
+    } else {
+      userLogger.warn(
+        "[nostr] Active signer permissions missing; signing reaction with session key.",
+        permissionResult.error,
+      );
+    }
+  }
+
+  if (!signedEvent) {
+    try {
+      if (!client.sessionActor || client.sessionActor.pubkey !== actorPubkey) {
+        await client.ensureSessionActor(true);
+      }
+      if (!client.sessionActor || client.sessionActor.pubkey !== actorPubkey) {
+        throw new Error("session-actor-mismatch");
+      }
+      const privateKey = client.sessionActor.privateKey;
+      signedEvent = signEventWithPrivateKey(event, privateKey);
+    } catch (error) {
+      userLogger.warn("[nostr] Failed to sign reaction event with session key:", error);
+      return { ok: false, error: "signing-failed", details: error };
+    }
+  }
+
+  const relayList = sanitizeRelayList(options.relays, client.relays);
+
+  const publishResults = await Promise.all(
+    relayList.map((url) => publishEventToRelay(client.pool, url, signedEvent))
+  );
+
+  const acceptedRelays = publishResults
+    .filter((result) => result.success)
+    .map((result) => result.url)
+    .filter((url) => typeof url === "string" && url);
+  const success = acceptedRelays.length > 0;
+
+  if (success) {
+    devLogger.info(
+      `[nostr] Reaction event accepted by ${acceptedRelays.length} relay(s):`,
+      acceptedRelays.join(", ")
+    );
+  } else {
+    userLogger.warn("[nostr] Reaction event rejected by relays:", publishResults);
+  }
+
+  return {
+    ok: success,
+    event: signedEvent,
+    results: publishResults,
+    acceptedRelays,
+  };
+}
diff --git a/js/nostrEventSchemas.js b/js/nostrEventSchemas.js
index f535671d..f54d2959 100644
--- a/js/nostrEventSchemas.js
+++ b/js/nostrEventSchemas.js
@@ -16,6 +16,7 @@ export const NOTE_TYPES = Object.freeze({
   REPOST: "repost",
   RELAY_LIST: "relayList",
   VIEW_EVENT: "viewEvent",
+  VIDEO_REACTION: "videoReaction",
   WATCH_HISTORY_INDEX: "watchHistoryIndex",
   WATCH_HISTORY_CHUNK: "watchHistoryChunk",
   SUBSCRIPTION_LIST: "subscriptionList",
@@ -194,6 +195,17 @@ const BASE_SCHEMAS = {
       description: "Optional plaintext content used for diagnostics.",
     },
   },
+  [NOTE_TYPES.VIDEO_REACTION]: {
+    type: NOTE_TYPES.VIDEO_REACTION,
+    label: "Reaction event",
+    kind: 7,
+    appendTags: DEFAULT_APPEND_TAGS,
+    content: {
+      format: "text",
+      description:
+        "Reaction payload for the referenced event (e.g., '+', '-', or emoji).",
+    },
+  },
   [NOTE_TYPES.WATCH_HISTORY_INDEX]: {
     type: NOTE_TYPES.WATCH_HISTORY_INDEX,
     label: "Watch history index",
@@ -384,6 +396,41 @@ function appendSchemaTags(tags, schema) {
   return tags;
 }
 
+function collectPointerTags(schema, {
+  pointerValue,
+  pointerTag,
+  pointerTags = [],
+} = {}) {
+  const normalized = [];
+
+  const pointerTagName = schema?.pointerTagName;
+  if (pointerValue && pointerTagName) {
+    const normalizedValue =
+      typeof pointerValue === "string" ? pointerValue : String(pointerValue);
+    if (normalizedValue) {
+      normalized.push([pointerTagName, normalizedValue]);
+    }
+  }
+
+  if (Array.isArray(pointerTag) && pointerTag.length >= 2) {
+    normalized.push(
+      pointerTag.map((value) => (typeof value === "string" ? value : String(value)))
+    );
+  }
+
+  if (Array.isArray(pointerTags)) {
+    pointerTags.forEach((tag) => {
+      if (Array.isArray(tag) && tag.length >= 2) {
+        normalized.push(
+          tag.map((value) => (typeof value === "string" ? value : String(value)))
+        );
+      }
+    });
+  }
+
+  return normalized;
+}
+
 export function buildVideoPostEvent({
   pubkey,
   created_at,
@@ -590,25 +637,11 @@ export function buildViewEvent({
     tags.push([schema.topicTag.name, schema.topicTag.value]);
   }
 
-  const pointerTagName = schema?.pointerTagName;
-  if (pointerValue && pointerTagName) {
-    tags.push([pointerTagName, pointerValue]);
-  }
-  const normalizedPointerTags = [];
-  if (Array.isArray(pointerTag) && pointerTag.length >= 2) {
-    normalizedPointerTags.push(
-      pointerTag.map((value) => (typeof value === "string" ? value : String(value)))
-    );
-  }
-  if (Array.isArray(pointerTags)) {
-    pointerTags.forEach((tag) => {
-      if (Array.isArray(tag) && tag.length >= 2) {
-        normalizedPointerTags.push(
-          tag.map((value) => (typeof value === "string" ? value : String(value)))
-        );
-      }
-    });
-  }
+  const normalizedPointerTags = collectPointerTags(schema, {
+    pointerValue,
+    pointerTag,
+    pointerTags,
+  });
   normalizedPointerTags.forEach((tag) => {
     tags.push(tag);
   });
@@ -650,6 +683,48 @@ export function buildViewEvent({
   };
 }
 
+export function buildReactionEvent({
+  pubkey,
+  created_at,
+  pointerValue,
+  pointerTag,
+  pointerTags = [],
+  additionalTags = [],
+  content = "",
+}) {
+  const schema = getNostrEventSchema(NOTE_TYPES.VIDEO_REACTION);
+  const tags = [];
+
+  const normalizedPointerTags = collectPointerTags(schema, {
+    pointerValue,
+    pointerTag,
+    pointerTags,
+  });
+  normalizedPointerTags.forEach((tag) => {
+    tags.push(tag);
+  });
+
+  if (Array.isArray(additionalTags)) {
+    additionalTags.forEach((tag) => {
+      if (Array.isArray(tag) && tag.length >= 2) {
+        tags.push(tag.map((value) => (typeof value === "string" ? value : String(value))));
+      }
+    });
+  }
+
+  appendSchemaTags(tags, schema);
+
+  const resolvedContent = ensureValidUtf8Content(content);
+
+  return {
+    kind: schema?.kind ?? 7,
+    pubkey,
+    created_at,
+    tags,
+    content: resolvedContent,
+  };
+}
+
 export function buildWatchHistoryIndexEvent({
   pubkey,
   created_at,
diff --git a/js/reactionCounter.js b/js/reactionCounter.js
new file mode 100644
index 00000000..0335d55f
--- /dev/null
+++ b/js/reactionCounter.js
@@ -0,0 +1,27 @@
+import { publishVideoReaction } from "./nostr.js";
+import { devLogger, userLogger } from "./utils/logger.js";
+
+export const reactionCounter = {
+  async publish(pointer, options = {}) {
+    try {
+      const result = await publishVideoReaction(pointer, options);
+      if (!result || !result.ok) {
+        userLogger.warn(
+          "[reactionCounter] Reaction publish rejected by relays:",
+          result?.results || result
+        );
+      } else if (Array.isArray(result.acceptedRelays)) {
+        devLogger.info(
+          `[reactionCounter] Reaction accepted by ${result.acceptedRelays.length} relay(s):`,
+          result.acceptedRelays.join(", ")
+        );
+      }
+      return result;
+    } catch (error) {
+      userLogger.warn("[reactionCounter] Failed to publish reaction event:", error);
+      throw error;
+    }
+  },
+};
+
+export default reactionCounter;