diff --git a/backend/src/api/bitcoin/bitcoin.routes.ts b/backend/src/api/bitcoin/bitcoin.routes.ts
index ffdcd0c26..66bcb2569 100644
--- a/backend/src/api/bitcoin/bitcoin.routes.ts
+++ b/backend/src/api/bitcoin/bitcoin.routes.ts
@@ -474,7 +474,7 @@ class BitcoinRoutes {
   private async getRawBlock(req: Request, res: Response) {
     try {
       const result = await bitcoinApi.$getRawBlock(req.params.hash);
-      res.setHeader('content-type', 'text/plain');
+      res.setHeader('content-type', 'application/octet-stream');
       res.send(result);
     } catch (e) {
       res.status(500).send(e instanceof Error ? e.message : e);