From 4b604d1db8af5b37db7b677a48132ea262d2aedd Mon Sep 17 00:00:00 2001
From: Rima <153289003+casks-mutters@users.noreply.github.com>
Date: Mon, 17 Nov 2025 04:25:19 -0500
Subject: [PATCH] Send checksum() errors to stderr

Error messages should go to stderr for easier scripting.
---
 slot_change_finder.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/slot_change_finder.py b/slot_change_finder.py
index f7ba47b..d0c6db2 100644
--- a/slot_change_finder.py
+++ b/slot_change_finder.py
@@ -13,7 +13,8 @@ def parse_slot(s: str) -> int:
 
 def checksum(addr: str) -> str:
     if not Web3.is_address(addr):
-        print("❌ Invalid Ethereum address."); sys.exit(2)
+        print("❌ Invalid Ethereum address.", file=sys.stderr)
+        sys.exit(2)
     return Web3.to_checksum_address(addr)
 
 def connect(url: str) -> Web3: