diff --git a/packages/unbreakable_consensus/epoch.go b/packages/unbreakable_consensus/epoch.go
new file mode 100644
index 0000000000000000000000000000000000000000..48c5440c419da495bcb5a626b589773ec0a590cc
--- /dev/null
+++ b/packages/unbreakable_consensus/epoch.go
@@ -0,0 +1,4 @@
+package unbreakable_consensus
+
+type Epoch struct {
+}