diff --git a/tools/preimage.py b/tools/preimage.py
new file mode 100644
index 00000000..48b5d051
--- /dev/null
+++ b/tools/preimage.py
@@ -0,0 +1,8 @@
+import hashlib
+import os
+
+preimage = os.urandom(32)
+preimage_hash = hashlib.sha256(preimage).hexdigest()
+
+print(f"preimage hash: {preimage_hash}")
+print(f"preimage: {preimage.hex()}")