diff --git a/src/cmd_u2fsign.rs b/src/cmd_u2fsign.rs
index 034e484..0bf24c4 100644
--- a/src/cmd_u2fsign.rs
+++ b/src/cmd_u2fsign.rs
@@ -97,9 +97,6 @@ impl Command for CommandImpl {
         let counter = &sign_data[1..=4];
         let signature = &sign_data[5..];
 
-        // let client_data = u2fv2_challenge_str.as_bytes().to_vec();
-        // let app_id_hash = sha256(app_id.as_bytes());
-        // let client_data_hash = sha256(&client_data[..]);
         let counter_u32 = u32::from_be_bytes([counter[0], counter[1], counter[2], counter[3]]);
         // application (32B) + user presence (1B) + counter (4B) + client data hash (32B)
         let mut signed_message = Vec::with_capacity(128);
@@ -129,7 +126,6 @@ impl Command for CommandImpl {
             information!("- presence : {}", user_presence_flag);
             information!("- counter  : {}", counter_u32);
             information!("- signature: {}", hex::encode(&signature));
-            // success!("Key handle used: {}", base64::encode(&handle_used));
             information!("Key handle: {}", hex::encode(&handle_used));
             information!("Signed message: {}", hex::encode(&signed_message));
         }