diff --git a/nomos-services/data-availability/src/backend/mod.rs b/nomos-services/data-availability/src/backend/mod.rs
index c22431761..cf4668564 100644
--- a/nomos-services/data-availability/src/backend/mod.rs
+++ b/nomos-services/data-availability/src/backend/mod.rs
@@ -1,5 +1,6 @@
 mod memory_cache;
 
+use nomos_core::blob::Blob;
 use overwatch_rs::DynError;
 
 #[derive(Debug)]
@@ -11,7 +12,7 @@ pub enum DaError {
 pub trait DaBackend {
     type Settings: Clone;
 
-    type Blob;
+    type Blob: Blob;
 
     fn new(settings: Self::Settings) -> Self;