Add extrinsic record

extrinsic_record.json

@@ -0,0 +1,4 @@
+{
+  "extrinsic": "7716714-15",
+  "hotkey": "5H9h7FpdVMCt5zMsAdFPzrGruLSxcuGEG8D2a9XiMN4XavQC"
+}