Add extrinsic_record.json

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "hotkey": "5FBrao2SfByUmWGCFEWCQFneE81WYuV4G4U7useh7VrEbQEP",
+  "extrinsic": "7739278-17"
+}