diff --git a/keyserver/src/creators/farcaster-channel-tag-creator.js b/keyserver/src/creators/farcaster-channel-tag-creator.js
new file mode 100644
--- /dev/null
+++ b/keyserver/src/creators/farcaster-channel-tag-creator.js
@@ -0,0 +1,89 @@
+// @flow
+
+import uuid from 'uuid';
+
+import type {
+  CreateOrUpdateFarcasterChannelTagRequest,
+  CreateOrUpdateFarcasterChannelTagResponse,
+} from 'lib/types/community-types.js';
+import { ServerError } from 'lib/utils/errors.js';
+
+import {
+  uploadBlob,
+  assignHolder,
+  download,
+  type BlobOperationResult,
+  type BlobDownloadResult,
+} from '../services/blob.js';
+import { Viewer } from '../session/viewer.js';
+
+async function createOrUpdateFarcasterChannelTag(
+  viewer: Viewer,
+  request: CreateOrUpdateFarcasterChannelTagRequest,
+): Promise<CreateOrUpdateFarcasterChannelTagResponse> {
+  const { commCommunityID, farcasterChannelID } = request;
+
+  const blobDownload = await getFarcasterChannelTagBlob(farcasterChannelID);
+
+  if (blobDownload.found) {
+    throw new ServerError('already_in_use');
+  }
+
+  const blobHolder = uuid.v4();
+
+  const blobResult = await uploadFarcasterChannelTagBlob(
+    commCommunityID,
+    farcasterChannelID,
+    blobHolder,
+  );
+
+  if (!blobResult.success) {
+    if (blobResult.reason === 'HASH_IN_USE') {
+      throw new ServerError('already_in_use');
+    } else {
+      throw new ServerError('unknown_error');
+    }
+  }
+
+  return {
+    commCommunityID,
+    blobHolder,
+  };
+}
+
+function farcasterChannelTagBlobHash(secret: string): string {
+  return `farcaster_channel_tag_${secret}`;
+}
+
+function getFarcasterChannelTagBlob(
+  secret: string,
+): Promise<BlobDownloadResult> {
+  const hash = farcasterChannelTagBlobHash(secret);
+
+  return download(hash);
+}
+
+async function uploadFarcasterChannelTagBlob(
+  commCommunityID: string,
+  farcasterChannelID: string,
+  holder: string,
+): Promise<BlobOperationResult> {
+  const payload = {
+    commCommunityID,
+    farcasterChannelID,
+  };
+  const payloadString = JSON.stringify(payload);
+
+  const hash = farcasterChannelTagBlobHash(farcasterChannelID);
+  const blob = new Blob([payloadString]);
+
+  const uploadResult = await uploadBlob(blob, hash);
+
+  if (!uploadResult.success) {
+    return uploadResult;
+  }
+
+  return await assignHolder({ holder, hash });
+}
+
+export { createOrUpdateFarcasterChannelTag, uploadFarcasterChannelTagBlob };
diff --git a/lib/types/community-types.js b/lib/types/community-types.js
--- a/lib/types/community-types.js
+++ b/lib/types/community-types.js
@@ -16,3 +16,13 @@
   +id: string,
   +newCommunityInfo: CommunityInfo,
 };
+
+export type CreateOrUpdateFarcasterChannelTagRequest = {
+  +commCommunityID: string,
+  +farcasterChannelID: string,
+};
+
+export type CreateOrUpdateFarcasterChannelTagResponse = {
+  +commCommunityID: string,
+  +blobHolder: string,
+};