diff --git a/beacon-chain/rpc/prysm/v1alpha1/validator/unblinder.go b/beacon-chain/rpc/prysm/v1alpha1/validator/unblinder.go
index 0e3f8289b..78871a917 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/validator/unblinder.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/validator/unblinder.go
@@ -100,7 +100,7 @@ func (u *unblinder) unblindBuilderBlock(ctx context.Context) (interfaces.SignedB
 		return nil, nil, errors.Wrap(err, "could not get transactions from payload")
 	}
 
-	if wb.Version() >= version.Bellatrix && blobsBundle != nil {
+	if wb.Version() >= version.Deneb && blobsBundle != nil {
 		log.WithField("blobCount", len(blobsBundle.Blobs))
 	}
 
@@ -124,6 +124,9 @@ func unblindBlobsSidecars(blindSidecars []*ethpb.SignedBlindedBlobSidecar, bundl
 	if bundle == nil {
 		return nil, nil
 	}
+	if len(blindSidecars) != len(bundle.Blobs) {
+		return nil, errors.Errorf("blob count mismatch: wanted %d but got %d", len(blindSidecars), len(bundle.Blobs))
+	}
 
 	sidecars := make([]*ethpb.SignedBlobSidecar, len(blindSidecars))
 	for i, b := range blindSidecars {