diff --git a/.gitignore b/.gitignore
index 6e292f6..83c4244 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,4 +16,5 @@ docs/
 __pycache__
 
 .vscode
+.idea
 temp/
diff --git a/src/BTCDepositAddressDeriver.sol b/src/BTCDepositAddressDeriver.sol
index 6e8ff61..ac4b75b 100644
--- a/src/BTCDepositAddressDeriver.sol
+++ b/src/BTCDepositAddressDeriver.sol
@@ -105,4 +105,12 @@ contract BTCDepositAddressDeriver {
                 ethAddr
             );
     }
+
+    function getBtcAddress1() public view returns (string memory) {
+        return btcAddr1;
+    }
+
+    function getBtcAddress2() public view returns (string memory) {
+        return btcAddr2;
+    }
 }
diff --git a/src/Deriver.sol b/src/Deriver.sol
index 17717f9..a82ed3e 100644
--- a/src/Deriver.sol
+++ b/src/Deriver.sol
@@ -84,7 +84,7 @@ library Deriver {
         bytes memory hrp,
         address ethAddr
     ) internal pure returns (string memory) {
-        (uint256 x, uint256 y) = getPubkeyFromAddress(
+        (uint256 x, uint256 _y) = getPubkeyFromAddress(
             p1x,
             p1y,
             p2x,