diff --git a/libethereum/Sentinel.json b/libethereum/Sentinel.json
new file mode 100644
index 000000000..743e4ce44
--- /dev/null
+++ b/libethereum/Sentinel.json
@@ -0,0 +1,3 @@
+[
+	{ "name": "eth_badBlock", "params": [ {} ], "order": [], "returns": 0 }
+]