Add extrinsic record

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "extrinsic": "7763719-21",
+  "hotkey": "5Hmc2u9NkEGwrtnimDdMkP6akPXnBMJqDrtxz3ttwQM2puFR"
+}