diff --git a/backend/mpc-system/services/service-party-android/build-apk.bat b/backend/mpc-system/services/service-party-android/build-apk.bat
index b7ace430..fbe60ff9 100644
--- a/backend/mpc-system/services/service-party-android/build-apk.bat
+++ b/backend/mpc-system/services/service-party-android/build-apk.bat
@@ -75,6 +75,82 @@ echo [INFO] Using SDK from local.properties
 type local.properties
 echo.
 
+:: Check and build tsslib.aar if needed
+if not exist "app\libs\tsslib.aar" (
+    echo [INFO] tsslib.aar not found, attempting to build TSS library...
+    echo.
+
+    :: Check if Go is installed
+    where go >nul 2>nul
+    if !errorlevel! neq 0 (
+        echo [ERROR] Go is not installed or not in PATH!
+        echo Please install Go from https://golang.org/dl/
+        pause
+        exit /b 1
+    )
+
+    :: Check if gomobile is installed
+    where gomobile >nul 2>nul
+    if !errorlevel! neq 0 (
+        echo [INFO] gomobile not found, installing...
+        go install golang.org/x/mobile/cmd/gomobile@latest
+        if !errorlevel! neq 0 (
+            echo [ERROR] Failed to install gomobile!
+            pause
+            exit /b 1
+        )
+        :: Initialize gomobile
+        gomobile init
+    )
+
+    :: Get the tsslib directory path (relative to service-party-android)
+    set "TSSLIB_DIR=..\..\libs\tsslib"
+
+    if not exist "!TSSLIB_DIR!\go.mod" (
+        echo [ERROR] TSS library source not found at !TSSLIB_DIR!
+        echo Please ensure the tsslib source code exists.
+        pause
+        exit /b 1
+    )
+
+    echo [INFO] Building tsslib.aar with gomobile...
+    pushd "!TSSLIB_DIR!"
+
+    :: Run go mod tidy first
+    go mod tidy
+    if !errorlevel! neq 0 (
+        echo [ERROR] go mod tidy failed!
+        popd
+        pause
+        exit /b 1
+    )
+
+    :: Build the AAR
+    gomobile bind -target=android -o "..\..\services\service-party-android\app\libs\tsslib.aar" .
+    if !errorlevel! neq 0 (
+        echo [ERROR] gomobile bind failed!
+        popd
+        pause
+        exit /b 1
+    )
+
+    popd
+
+    if exist "app\libs\tsslib.aar" (
+        echo [SUCCESS] tsslib.aar built successfully!
+        for %%F in ("app\libs\tsslib.aar") do echo   Size: %%~zF bytes
+    ) else (
+        echo [ERROR] tsslib.aar was not created!
+        pause
+        exit /b 1
+    )
+    echo.
+) else (
+    echo [INFO] tsslib.aar found, skipping TSS library build
+    for %%F in ("app\libs\tsslib.aar") do echo   Size: %%~zF bytes
+    echo.
+)
+
 :: Parse command line arguments
 set BUILD_TYPE=all
 if "%1"=="debug" set BUILD_TYPE=debug