Add extrinsic record

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "extrinsic": "7572975-7",
+  "hotkey": "5GzcMRjvWgZUwPX3XsKh46scLzEvaYXLirgby2Y1t8YxdWMe"
+}