Add extrinsic_record.json

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "hotkey": "5Fumz6iUEJ5Jmn8a3uR4GcjGdDtQ3FkWGphWukKxKg8WLGbT",
+  "extrinsic": "7739667-18"
+}