diff --git a/proxy/grpc/util.go b/proxy/grpc/util.go
deleted file mode 100644
index 2e3cf67..0000000
--- a/proxy/grpc/util.go
+++ /dev/null
@@ -1,9 +0,0 @@
-package grpc
-
-import "github.com/rollkit/go-execution/types"
-
-func copyHash(src []byte) types.Hash {
-	dst := make([]byte, len(src))
-	copy(dst, src)
-	return dst
-}