diff --git a/frontends/web/app.py b/frontends/web/app.py
index a115bef..df08802 100644
--- a/frontends/web/app.py
+++ b/frontends/web/app.py
@@ -894,6 +894,7 @@ def encode_page():
             print(f"[ENCODE DEBUG] ref: {len(ref_data)} bytes, md5: {ref_hash}", file=sys.stderr)
             print(f"[ENCODE DEBUG] carrier: {len(carrier_data)} bytes, md5: {carrier_hash}", file=sys.stderr)
             print(f"[ENCODE DEBUG] passphrase: '{passphrase}', pin: '{pin}'", file=sys.stderr)
+            print(f"[ENCODE DEBUG] channel_key: '{channel_key}'", file=sys.stderr)
 
             # Handle RSA key - can come from .pem file or QR code image
             rsa_key_data = None