diff --git a/v2/proto/purchase.proto b/v2/proto/purchase.proto
new file mode 100644
index 0000000..f52b531
--- /dev/null
+++ b/v2/proto/purchase.proto
@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package pb;
+
+message Purchase {
+    bytes claim_hash = 1;
+}