diff --git a/src/middleware/uploaderMiddleware.ts b/src/middleware/uploaderMiddleware.ts
index b0ee570a..38e8aceb 100644
--- a/src/middleware/uploaderMiddleware.ts
+++ b/src/middleware/uploaderMiddleware.ts
@@ -1,10 +1,9 @@
-import { BlossomUploader } from '@nostrify/nostrify/uploaders';
+import { BlossomUploader, NostrBuildUploader } from '@nostrify/nostrify/uploaders';
 
 import { AppMiddleware } from '@/app.ts';
 import { Conf } from '@/config.ts';
 import { DenoUploader } from '@/uploaders/DenoUploader.ts';
 import { IPFSUploader } from '@/uploaders/IPFSUploader.ts';
-import { NostrBuildUploader } from '@/uploaders/NostrBuildUploader.ts';
 import { S3Uploader } from '@/uploaders/S3Uploader.ts';
 import { fetchWorker } from '@/workers/fetch.ts';
 
@@ -23,7 +22,7 @@ export const uploaderMiddleware: AppMiddleware = async (c, next) => {
       c.set('uploader', new DenoUploader({ baseUrl: Conf.mediaDomain, dir: Conf.uploadsDir }));
       break;
     case 'nostrbuild':
-      c.set('uploader', new NostrBuildUploader({ endpoint: Conf.nostrbuildEndpoint, fetch: fetchWorker }));
+      c.set('uploader', new NostrBuildUploader({ endpoint: Conf.nostrbuildEndpoint, signer, fetch: fetchWorker }));
       break;
     case 'blossom':
       if (signer) {
diff --git a/src/uploaders/NostrBuildUploader.ts b/src/uploaders/NostrBuildUploader.ts
deleted file mode 100644
index ff4a4f0e..00000000
--- a/src/uploaders/NostrBuildUploader.ts
+++ /dev/null
@@ -1,69 +0,0 @@
-import { z } from 'zod';
-
-import { DittoUploader } from '@/interfaces/DittoUploader.ts';
-
-export interface NostrBuildUploaderOpts {
-  endpoint?: string;
-  fetch?: typeof fetch;
-}
-
-/** Upload files to nostr.build or another compatible server. */
-export class NostrBuildUploader implements DittoUploader {
-  private endpoint: string;
-  private fetch: typeof fetch;
-
-  constructor(opts: NostrBuildUploaderOpts) {
-    this.endpoint = opts.endpoint ?? 'https://nostr.build/api/v2/upload/files';
-    this.fetch = opts.fetch ?? globalThis.fetch;
-  }
-
-  async upload(file: File, opts?: { signal?: AbortSignal }): Promise<[['url', string], ...string[][]]> {
-    const formData = new FormData();
-    formData.append('fileToUpload', file);
-
-    const response = await this.fetch(this.endpoint, {
-      method: 'POST',
-      body: formData,
-      signal: opts?.signal,
-    });
-
-    const json = await response.json();
-    const [data] = NostrBuildUploader.schema().parse(json).data;
-
-    const tags: [['url', string], ...string[][]] = [
-      ['url', data.url],
-      ['m', data.mime],
-      ['x', data.sha256],
-      ['ox', data.original_sha256],
-      ['size', data.size.toString()],
-    ];
-
-    if (data.dimensions) {
-      tags.push(['dim', `${data.dimensions.width}x${data.dimensions.height}`]);
-    }
-
-    if (data.blurhash) {
-      tags.push(['blurhash', data.blurhash]);
-    }
-
-    return tags;
-  }
-
-  /** nostr.build API response schema. */
-  private static schema() {
-    return z.object({
-      data: z.object({
-        url: z.string().url(),
-        blurhash: z.string().optional().catch(undefined),
-        sha256: z.string(),
-        original_sha256: z.string(),
-        mime: z.string(),
-        size: z.number(),
-        dimensions: z.object({
-          width: z.number(),
-          height: z.number(),
-        }).optional().catch(undefined),
-      }).array().min(1),
-    });
-  }
-}