Add extrinsic record

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "extrinsic": "7591933-26",
+  "hotkey": "5HU1EiMzFDTDjC9kK3WhY3h6fuuaZRHdx22KFgpnY8PWkJK5"
+}