diff --git a/accountresolver/bundlerreader.go b/accountresolver/bundlerreader.go
index 2472049d..9e2fbe62 100644
--- a/accountresolver/bundlerreader.go
+++ b/accountresolver/bundlerreader.go
@@ -2,6 +2,7 @@ package accountsresolver
 
 import (
 	"context"
+	"encoding/binary"
 	"fmt"
 	"io"
 	"time"
@@ -57,10 +58,13 @@ func (r *BundleReader) PushBlock(block *bstream.Block) error {
 		return fmt.Errorf("unable to marshal proto block: %w", err)
 	}
 
+	length := make([]byte, 4)
+	binary.BigEndian.PutUint32(length, uint32(len(data)))
+
 	select {
 	case <-r.ctx.Done():
 		return nil
-	case r.blockData <- data:
+	case r.blockData <- append(length, data...):
 		return nil
 	}
 }
diff --git a/cmd/grrr/main.go b/cmd/grrr/main.go
new file mode 100644
index 00000000..31412c43
--- /dev/null
+++ b/cmd/grrr/main.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/streamingfast/dbin"
+
+	pbbstream "github.com/streamingfast/pbgo/sf/bstream/v1"
+	"google.golang.org/protobuf/proto"
+)
+
+func main() {
+	//data, err := os.ReadFile("/Users/cbillett/devel/sf/0154667200.dbin")
+	//if err != nil {
+	//	panic(err)
+	//}
+
+	fr, err := dbin.NewFileReader("/Users/cbillett/devel/sf/0154667200.dbin")
+	if err != nil {
+		panic(err)
+	}
+
+	contentType, version, err := fr.ReadHeader()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("type:", contentType, "version:", version)
+
+	for {
+		data, err := fr.ReadMessage()
+		if err != nil {
+			panic(err)
+		}
+		b := &pbbstream.Block{}
+		err = proto.Unmarshal(data, b)
+		if err != nil {
+			panic(err)
+		}
+
+		fmt.Println(b.Number)
+	}
+}