Add extrinsic record

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "extrinsic": "7619226-20",
+  "hotkey": "5F6bvbXWy1FXgbGDeQgn7Eza6rCTBnTQK4dad3suTTywkZBg"
+}