diff --git a/.appveyor.yml b/.appveyor.yml
index 8a2822a..aac253a 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -27,6 +27,7 @@ after_build:
    - cmd: xcopy /s /y WelsonJS.Toolkit\WelsonJS.Launcher\bin\x86\%CONFIGURATION%\* artifacts\
    - cmd: nuget pack WelsonJS.Toolkit\WelsonJS.Toolkit\ -properties Configuration=%CONFIGURATION% -properties Platform=x86 -OutputDirectory artifacts\
    - ps: Start-BitsTransfer -Source "https://catswords.blob.core.windows.net/welsonjs/welsonjs_setup_unsigned.exe" -Destination "artifacts\welsonjs_setup.exe"
+   - ps: Start-BitsTransfer -Source "https://catswords.blob.core.windows.net/welsonjs/chakracore-build/x86_release/ChakraCore.dll" -Destination "artifacts\ChakraCore.dll"
    - cmd: 7z a artifacts.zip artifacts\*
 
 artifacts:
@@ -45,4 +46,4 @@ notifications:
       - gnh1201@catswords.re.kr
     subject: "Build {{status}}: {{projectName}} {{buildVersion}}"
     on_build_success: false
-    on_build_failure: true
+    on_build_failure: true
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..317e9ac
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "WelsonJS.Toolkit/ChakraCore"]
+	path = WelsonJS.Toolkit/ChakraCore
+	url = https://github.com/chakra-core/ChakraCore
diff --git a/WelsonJS.Toolkit/ChakraCore b/WelsonJS.Toolkit/ChakraCore
new file mode 160000
index 0000000..36becec
--- /dev/null
+++ b/WelsonJS.Toolkit/ChakraCore
@@ -0,0 +1 @@
+Subproject commit 36becec43348f259e8bee08cf2fcd171bfe56f42
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ICompatibleLogger.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ICompatibleLogger.cs
index 74b323f..16d4edb 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ICompatibleLogger.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ICompatibleLogger.cs
@@ -10,8 +10,8 @@ namespace WelsonJS.Launcher
 {
     public interface ICompatibleLogger
     {
-        void Info(string message);
-        void Warn(string message);
-        void Error(string message);
+        void Info(params object[] args);
+        void Warn(params object[] args);
+        void Error(params object[] args);
     }
 }
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/JsCore.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/JsCore.cs
new file mode 100644
index 0000000..53af2b5
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/JsCore.cs
@@ -0,0 +1,71 @@
+// JsCore.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Globalization;
+using System.Runtime.InteropServices;
+
+namespace WelsonJS.Launcher
+{
+    public sealed class JsCore : IDisposable
+    {
+        private JsNative.JsRuntime _rt;
+        private JsNative.JsContext _ctx;
+        private bool _disposed;
+
+        public JsCore()
+        {
+            Check(JsNative.JsCreateRuntime(JsNative.JsRuntimeAttributes.None, null, out _rt), "JsCreateRuntime");
+            Check(JsNative.JsCreateContext(_rt, out _ctx), "JsCreateContext");
+            Check(JsNative.JsSetCurrentContext(_ctx), "JsSetCurrentContext");
+        }
+
+        public string EvaluateToString(string script, string sourceUrl = "repl")
+        {
+            if (_disposed) throw new ObjectDisposedException(nameof(JsCore));
+            if (script == null) throw new ArgumentNullException(nameof(script));
+
+            JsNative.JsValue result;
+            Check(JsNative.JsRunScript(script, UIntPtr.Zero, sourceUrl, out result), "JsRunScript");
+
+            JsNative.JsValue jsStr;
+            Check(JsNative.JsConvertValueToString(result, out jsStr), "JsConvertValueToString");
+
+            IntPtr p;
+            UIntPtr len;
+            Check(JsNative.JsStringToPointer(jsStr, out p, out len), "JsStringToPointer");
+
+            int chars = checked((int)len);
+            return Marshal.PtrToStringUni(p, chars);
+        }
+
+        private static void Check(JsNative.JsErrorCode code, string op)
+        {
+            if (code != JsNative.JsErrorCode.JsNoError)
+                throw new InvalidOperationException(op + " failed: " + code + " (0x" + ((int)code).ToString("X", CultureInfo.InvariantCulture) + ")");
+        }
+
+        public void Dispose()
+        {
+            if (_disposed) return;
+            _disposed = true;
+
+            try
+            {
+                // Unset current context
+                JsNative.JsSetCurrentContext(new JsNative.JsContext { Handle = IntPtr.Zero });
+            }
+            catch { /* ignore */ }
+            finally
+            {
+                if (_rt.Handle != IntPtr.Zero)
+                    JsNative.JsDisposeRuntime(_rt);
+            }
+            GC.SuppressFinalize(this);
+        }
+
+        ~JsCore() { Dispose(); }
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/JsNative.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/JsNative.cs
new file mode 100644
index 0000000..3f44823
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/JsNative.cs
@@ -0,0 +1,93 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace WelsonJS.Launcher
+{
+    public static class JsNative
+    {
+        // === Enums / handles ===
+        [Flags]
+        public enum JsRuntimeAttributes : uint
+        {
+            None = 0x00000000,
+            DisableBackgroundWork = 0x00000001,
+            AllowScriptInterrupt = 0x00000002,
+            EnableIdleProcessing = 0x00000004,
+            DisableNativeCodeGeneration = 0x00000008,
+            EnableExperimentalFeatures = 0x00000010,
+        }
+
+        // ChakraCore typedefs are opaque pointers; represent as IntPtr
+        public struct JsRuntime { public IntPtr Handle; }
+        public struct JsContext { public IntPtr Handle; }
+        public struct JsValue { public IntPtr Handle; }
+
+        // JsErrorCode (essential subset; expand as needed)
+        public enum JsErrorCode
+        {
+            JsNoError = 0,
+
+            // Usage
+            JsErrorInvalidArgument = 0x10001,
+            JsErrorNullArgument = 0x10002,
+            JsErrorNoCurrentContext = 0x10003,
+            JsErrorInExceptionState = 0x10004,
+            JsErrorNotImplemented = 0x10005,
+            JsErrorWrongThread = 0x10006,
+            JsErrorRuntimeInUse = 0x10007,
+
+            // Script
+            JsErrorScriptException = 0x30001,
+            JsErrorScriptCompile = 0x30002,
+            JsErrorScriptTerminated = 0x30003,
+
+            // Engine
+            JsErrorOutOfMemory = 0x20001,
+
+            // Fatal
+            JsErrorFatal = 0x40001,
+        }
+
+        // Thread service callback: __stdcall
+        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
+        public delegate JsErrorCode JsThreadServiceCallback(IntPtr callback, IntPtr callbackState);
+
+        // ======= FIXED SIGNATURES (StdCall + Unicode) =======
+
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsCreateRuntime(
+            JsRuntimeAttributes attributes,
+            JsThreadServiceCallback threadService,               // pass null if unused
+            out JsRuntime runtime);
+
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsCreateContext(
+            JsRuntime runtime,
+            out JsContext newContext);
+
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsSetCurrentContext(JsContext context);
+
+        // JsSourceContext is size_t → UIntPtr; strings are wide-char
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode)]
+        public static extern JsErrorCode JsRunScript(
+            string script,
+            UIntPtr sourceContext,
+            string sourceUrl,
+            out JsValue result);
+
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsConvertValueToString(JsValue value, out JsValue stringValue);
+
+        // Returns pointer to UTF-16 buffer + length (size_t) for a JsString value
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsStringToPointer(
+            JsValue value,
+            out IntPtr buffer,
+            out UIntPtr length);
+
+        // Unset by passing "invalid" context (JS_INVALID_REFERENCE is typically null)
+        [DllImport("ChakraCore.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern JsErrorCode JsDisposeRuntime(JsRuntime runtime);
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/JsSerializer.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/JsSerializer.cs
new file mode 100644
index 0000000..5eddd2d
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/JsSerializer.cs
@@ -0,0 +1,295 @@
+// JsSerializer.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+
+namespace WelsonJS.Launcher
+{
+    public sealed class JsSerializer : IDisposable
+    {
+        private readonly JsCore _core;
+        private readonly bool _ownsCore;
+
+        public JsSerializer() : this(new JsCore(), true) { }
+
+        public JsSerializer(JsCore core, bool ownsCore)
+        {
+            if (core == null) throw new ArgumentNullException("core");
+            _core = core;
+            _ownsCore = ownsCore;
+        }
+
+        public bool IsValid(string json)
+        {
+            if (json == null) throw new ArgumentNullException("json");
+            string script =
+                "(function(){try{JSON.parse(" + Q(json) + ");return '1';}catch(_){return '0';}})()";
+            string r = _core.EvaluateToString(script);
+            return r == "1";
+        }
+
+        public string Minify(string json)
+        {
+            if (json == null) throw new ArgumentNullException("json");
+            string script = "JSON.stringify(JSON.parse(" + Q(json) + "))";
+            return _core.EvaluateToString(script);
+        }
+
+        public string Pretty(string json, int space)
+        {
+            if (json == null) throw new ArgumentNullException("json");
+            space = Clamp(space, 0, 10);
+            string script = "JSON.stringify(JSON.parse(" + Q(json) + "),null," + space.ToString(CultureInfo.InvariantCulture) + ")";
+            return _core.EvaluateToString(script);
+        }
+
+        public string Normalize(string json)
+        {
+            return Minify(json);
+        }
+
+        /// <summary>
+        /// Extracts a value by a simple path of property names (numeric segment as string = array index).
+        /// Returns the selected value as a JSON string.
+        /// </summary>
+        public string Extract(string json, params string[] path)
+        {
+            if (path == null) path = new string[0];
+            object[] mixed = new object[path.Length];
+            for (int i = 0; i < path.Length; i++) mixed[i] = path[i];
+            return Extract(json, mixed);
+        }
+
+        /// <summary>
+        /// Extracts by a mixed path. Segments can be strings (object keys) or integers (array indices).
+        /// Returns the selected value as a JSON string (e.g., a JS string returns with quotes).
+        /// Usage: Extract(json, "items", 0, "name")
+        /// </summary>
+        public string Extract(string json, params object[] path)
+        {
+            if (json == null) throw new ArgumentNullException("json");
+            if (path == null) path = new object[0];
+
+            string jsPath = BuildJsPath(path);
+
+            var sb = new StringBuilder();
+            sb.Append("(function(){var v=JSON.parse(").Append(Q(json)).Append(");");
+            sb.Append("var p=").Append(jsPath).Append(";");
+            sb.Append("for(var i=0;i<p.length;i++){var k=p[i];");
+            sb.Append("if(Array.isArray(v) && typeof k==='number'){ v=v[k]; }");
+            sb.Append("else { v=(v==null?null:v[k]); }}");
+            sb.Append("return JSON.stringify(v);})()");
+            return _core.EvaluateToString(sb.ToString());
+        }
+
+        public string Serialize(object value, int space)
+        {
+            space = Clamp(space, 0, 10);
+            string expr = BuildJsExpression(value, new HashSet<object>(ReferenceEqualityComparer.Instance), 0);
+            string script = "JSON.stringify((" + expr + "),null," + space.ToString(CultureInfo.InvariantCulture) + ")";
+            return _core.EvaluateToString(script);
+        }
+
+        private static int Clamp(int v, int min, int max)
+        {
+            if (v < min) return min;
+            if (v > max) return max;
+            return v;
+        }
+
+        /// <summary>
+        /// Encode a .NET string as a JS double-quoted string literal.
+        /// </summary>
+        private static string Q(string s)
+        {
+            if (s == null) return "null";
+            var sb = new StringBuilder(s.Length + 16);
+            sb.Append('"');
+            for (int i = 0; i < s.Length; i++)
+            {
+                char ch = s[i];
+                switch (ch)
+                {
+                    case '\\': sb.Append(@"\\"); break;
+                    case '"': sb.Append("\\\""); break;
+                    case '\b': sb.Append(@"\b"); break;
+                    case '\f': sb.Append(@"\f"); break;
+                    case '\n': sb.Append(@"\n"); break;
+                    case '\r': sb.Append(@"\r"); break;
+                    case '\t': sb.Append(@"\t"); break;
+                    case '\u2028': sb.Append("\\u2028"); break;
+                    case '\u2029': sb.Append("\\u2029"); break;
+                    default:
+                        if (char.IsControl(ch))
+                        {
+                            sb.Append("\\u");
+                            sb.Append(((int)ch).ToString("X4"));
+                        }
+                        else
+                        {
+                            sb.Append(ch);
+                        }
+                        break;
+                }
+            }
+            sb.Append('"');
+            return sb.ToString();
+        }
+
+        /// <summary>
+        /// Builds a JS array literal representing the path.
+        /// Numeric segments are emitted as numbers; others as strings.
+        /// </summary>
+        private static string BuildJsPath(object[] segments)
+        {
+            if (segments == null || segments.Length == 0) return "[]";
+
+            var sb = new StringBuilder();
+            sb.Append('[');
+            for (int i = 0; i < segments.Length; i++)
+            {
+                if (i > 0) sb.Append(',');
+
+                object seg = segments[i];
+
+                // Treat integral types as numbers for array indexing
+                if (seg is sbyte || seg is byte ||
+                    seg is short || seg is ushort ||
+                    seg is int || seg is uint ||
+                    seg is long || seg is ulong)
+                {
+                    sb.Append(Convert.ToString(seg, CultureInfo.InvariantCulture));
+                }
+                else
+                {
+                    string str = (seg == null) ? string.Empty : Convert.ToString(seg, CultureInfo.InvariantCulture);
+                    sb.Append(Q(str));
+                }
+            }
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        private static bool IsNumeric(object v)
+        {
+            if (v == null) return false;
+            Type t = v.GetType();
+            t = Nullable.GetUnderlyingType(t) ?? t;
+            return t == typeof(byte) || t == typeof(sbyte) ||
+                   t == typeof(short) || t == typeof(ushort) ||
+                   t == typeof(int) || t == typeof(uint) ||
+                   t == typeof(long) || t == typeof(ulong) ||
+                   t == typeof(float) || t == typeof(double) ||
+                   t == typeof(decimal);
+        }
+
+        private static bool IsImmutableLike(object v)
+        {
+            return v is string || v is bool ||
+                   v is byte || v is sbyte ||
+                   v is short || v is ushort ||
+                   v is int || v is uint ||
+                   v is long || v is ulong ||
+                   v is float || v is double || v is decimal ||
+                   v is Guid || v is DateTime || v is DateTimeOffset;
+        }
+
+        /// <summary>
+        /// Builds a safe JS expression for a .NET value (no engine calls here).
+        /// Engine will stringify the produced expression via JSON.stringify.
+        /// </summary>
+        private static string BuildJsExpression(object value, HashSet<object> seen, int depth)
+        {
+            if (depth > 64) return "null"; // depth guard
+
+            if (value == null) return "null";
+
+            // Primitives
+            if (value is string) return Q((string)value);
+            if (value is bool) return ((bool)value) ? "true" : "false";
+            if (IsNumeric(value))
+                return Convert.ToString(value, CultureInfo.InvariantCulture);
+
+            // Common value-like types → stringify as JS strings
+            if (value is Guid)
+                return Q(((Guid)value).ToString());
+            if (value is DateTime)
+                return Q(((DateTime)value).ToUniversalTime().ToString("o", CultureInfo.InvariantCulture));
+            if (value is DateTimeOffset)
+                return Q(((DateTimeOffset)value).ToUniversalTime().ToString("o", CultureInfo.InvariantCulture));
+            if (value is byte[])
+                return Q(Convert.ToBase64String((byte[])value));
+
+            // Prevent circular refs for reference types
+            if (!IsImmutableLike(value) && !seen.Add(value))
+                return "null";
+
+            // IDictionary (string keys only)
+            if (value is IDictionary)
+            {
+                var map = (IDictionary)value;
+                var sb = new StringBuilder();
+                sb.Append('{');
+                bool first = true;
+                foreach (DictionaryEntry kv in map)
+                {
+                    string key = kv.Key as string;
+                    if (key == null) continue; // JSON keys must be strings
+                    if (!first) sb.Append(',');
+                    first = false;
+                    sb.Append(Q(key)).Append(':')
+                      .Append(BuildJsExpression(kv.Value, seen, depth + 1));
+                }
+                sb.Append('}');
+                return sb.ToString();
+            }
+
+            // IEnumerable → array
+            if (value is IEnumerable)
+            {
+                var seq = (IEnumerable)value;
+                var sb = new StringBuilder();
+                sb.Append('[');
+                bool first = true;
+                foreach (object item in seq)
+                {
+                    if (!first) sb.Append(',');
+                    first = false;
+                    sb.Append(BuildJsExpression(item, seen, depth + 1));
+                }
+                sb.Append(']');
+                return sb.ToString();
+            }
+
+            // Fallback → ToString() as JS string
+            string s = value.ToString();
+            return Q(s ?? string.Empty);
+        }
+
+        public void Dispose()
+        {
+            if (_ownsCore)
+                _core.Dispose();
+        }
+
+        /// <summary>
+        /// Reference equality comparer for cycle detection (works on .NET Framework).
+        /// </summary>
+        private sealed class ReferenceEqualityComparer : IEqualityComparer<object>
+        {
+            private ReferenceEqualityComparer() { }
+            public static readonly ReferenceEqualityComparer Instance = new ReferenceEqualityComparer();
+            bool IEqualityComparer<object>.Equals(object x, object y) { return object.ReferenceEquals(x, y); }
+            int IEqualityComparer<object>.GetHashCode(object obj)
+            {
+                return System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(obj);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/NativeBootstrap.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/NativeBootstrap.cs
new file mode 100644
index 0000000..609169b
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/NativeBootstrap.cs
@@ -0,0 +1,244 @@
+// NativeBootstrap.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography.X509Certificates;
+
+namespace WelsonJS.Launcher
+{
+    public static class NativeBootstrap
+    {
+        // Win32 APIs
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern IntPtr LoadLibrary(string lpFileName);
+
+        [DllImport("kernel32", SetLastError = true)]
+        private static extern bool SetDefaultDllDirectories(int DirectoryFlags);
+
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "AddDllDirectory")]
+        private static extern IntPtr AddDllDirectory(string newDirectory);
+
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern bool SetDllDirectory(string lpPathName);
+
+        private const int LOAD_LIBRARY_SEARCH_DEFAULT_DIRS = 0x00001000;
+
+        /// <summary>
+        /// Tries to load native libraries in the following order:
+        ///   1) %APPDATA%\{appDataSubdirectory}\{dllName}
+        ///   2) Application base directory\{dllName}
+        ///
+        /// Signatures:
+        ///  - requireSigned = true : Only loads DLLs with a valid Authenticode chain.
+        ///  - certValidator != null : Additional custom validation (e.g., pinning).
+        ///
+        /// Must be called before any P/Invoke usage.
+        /// </summary>
+        public static void Init(
+            IEnumerable<string> dllNames,
+            string appDataSubdirectory,
+            ICompatibleLogger logger,
+            bool requireSigned = false,
+            Func<X509Certificate2, bool> certValidator = null)
+        {
+            if (dllNames == null) throw new ArgumentNullException(nameof(dllNames));
+            if (logger == null) throw new ArgumentNullException(nameof(logger));
+
+            string appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+            string appDataPath = string.IsNullOrEmpty(appDataSubdirectory)
+                ? appData
+                : Path.Combine(appData, appDataSubdirectory);
+
+            string asmLocation = Assembly.GetEntryAssembly()?.Location
+                                 ?? Assembly.GetExecutingAssembly().Location
+                                 ?? AppContext.BaseDirectory;
+            string appBaseDirectory = Path.GetDirectoryName(asmLocation) ?? AppContext.BaseDirectory;
+
+            var triedPaths = new List<string>();
+
+            foreach (string dllName in dllNames)
+            {
+                if (string.IsNullOrWhiteSpace(dllName))
+                    continue;
+
+                // 1) %APPDATA% subdirectory
+                string candidate1 = Path.Combine(appDataPath, dllName);
+                triedPaths.Add(candidate1);
+                if (TryLoad(candidate1, logger, requireSigned, certValidator)) return;
+
+                // 2) Application base directory
+                string candidate2 = Path.Combine(appBaseDirectory, dllName);
+                triedPaths.Add(candidate2);
+                if (TryLoad(candidate2, logger, requireSigned, certValidator)) return;
+            }
+
+            string message = "Failed to load requested native libraries.\n" +
+                             "Tried:\n  " + string.Join("\n  ", triedPaths);
+            logger.Error(message);
+            throw new FileNotFoundException(message);
+        }
+
+        private static bool TryLoad(
+            string fullPath,
+            ICompatibleLogger logger,
+            bool requireSigned,
+            Func<X509Certificate2, bool> certValidator)
+        {
+            try
+            {
+                if (!File.Exists(fullPath))
+                {
+                    logger.Info($"Not found: {fullPath}");
+                    return false;
+                }
+
+                // Optional signature validation
+                if (!ValidateSignatureIfRequired(fullPath, requireSigned, certValidator, logger))
+                {
+                    // If requireSigned=false we never reach here (it would return true).
+                    logger.Warn($"Signature validation failed: {fullPath}");
+                    return false;
+                }
+
+                string directoryPath = Path.GetDirectoryName(fullPath) ?? AppContext.BaseDirectory;
+                if (!TryRegisterSearchDirectory(directoryPath, logger))
+                {
+                    logger.Warn($"Could not register search directory: {directoryPath}");
+                }
+
+                logger.Info($"Loading: {fullPath}");
+                IntPtr handle = LoadLibrary(fullPath);
+                if (handle == IntPtr.Zero)
+                {
+                    int err = Marshal.GetLastWin32Error();
+                    logger.Warn($"LoadLibrary failed for {fullPath} (Win32Error={err}).");
+                    return false;
+                }
+
+                logger.Info($"Successfully loaded: {fullPath}");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.Warn($"Exception while loading {fullPath}: {ex.Message}");
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// If requireSigned=false, returns true (no check).
+        /// If requireSigned=true, verifies Authenticode chain and optional custom validator.
+        /// </summary>
+        private static bool ValidateSignatureIfRequired(
+            string path,
+            bool requireSigned,
+            Func<X509Certificate2, bool> certValidator,
+            ICompatibleLogger logger)
+        {
+            if (!requireSigned)
+            {
+                // No signature requirement: allow loading regardless of signature.
+                return true;
+            }
+
+            try
+            {
+                // Throws on unsigned files.
+                var baseCert = X509Certificate.CreateFromSignedFile(path);
+                if (baseCert == null)
+                {
+                    logger.Warn("No certificate extracted from file.");
+                    return false;
+                }
+
+                var cert = new X509Certificate2(baseCert);
+
+                var chain = new X509Chain
+                {
+                    ChainPolicy =
+                {
+                    RevocationMode = X509RevocationMode.Online,
+                    RevocationFlag = X509RevocationFlag.ExcludeRoot,
+                    VerificationFlags = X509VerificationFlags.NoFlag,
+                    VerificationTime = DateTime.UtcNow
+                }
+                };
+
+                bool chainOk = chain.Build(cert);
+                if (!chainOk)
+                {
+                    foreach (var status in chain.ChainStatus)
+                        logger.Warn($"Cert chain status: {status.Status} - {status.StatusInformation?.Trim()}");
+                    return false;
+                }
+
+                // Optional extra validation, e.g. thumbprint or subject pinning.
+                if (certValidator != null)
+                {
+                    bool ok = false;
+                    try { ok = certValidator(cert); }
+                    catch (Exception ex)
+                    {
+                        logger.Warn($"Custom certificate validator threw: {ex.Message}");
+                        return false;
+                    }
+
+                    if (!ok)
+                    {
+                        logger.Warn("Custom certificate validator rejected the certificate.");
+                        return false;
+                    }
+                }
+
+                logger.Info($"Signature validated. Subject='{cert.Subject}', Thumbprint={cert.Thumbprint}");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.Warn($"Signature check failed: {ex.Message}");
+                return false;
+            }
+        }
+
+        private static bool TryRegisterSearchDirectory(string directoryPath, ICompatibleLogger logger)
+        {
+            try
+            {
+                bool ok = SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
+                if (!ok)
+                {
+                    int e = Marshal.GetLastWin32Error();
+                    logger.Warn($"SetDefaultDllDirectories failed (Win32Error={e}), fallback to SetDllDirectory.");
+                    return SetDllDirectory(directoryPath);
+                }
+
+                IntPtr cookie = AddDllDirectory(directoryPath);
+                if (cookie == IntPtr.Zero)
+                {
+                    int e = Marshal.GetLastWin32Error();
+                    logger.Warn($"AddDllDirectory failed (Win32Error={e}), fallback to SetDllDirectory.");
+                    return SetDllDirectory(directoryPath);
+                }
+
+                logger.Info($"Registered native DLL search directory: {directoryPath}");
+                return true;
+            }
+            catch (EntryPointNotFoundException)
+            {
+                logger.Warn("DefaultDllDirectories API not available. Using SetDllDirectory fallback.");
+                return SetDllDirectory(directoryPath);
+            }
+            catch (Exception ex)
+            {
+                logger.Warn($"Register search directory failed for {directoryPath}: {ex.Message}");
+                return false;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
index 23547c6..b15d93a 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
@@ -22,7 +22,22 @@ namespace WelsonJS.Launcher
 
         static Program()
         {
+            // set up logger
             _logger = new TraceLogger();
+
+            // load native libraries
+            string appDataSubDirectory = "WelsonJS";
+           bool requireSigned = string.Equals(
+               GetAppConfig("NativeRequireSigned"),
+               "true",
+               StringComparison.OrdinalIgnoreCase);
+
+            NativeBootstrap.Init(
+                dllNames: new[] { "ChakraCore.dll" },
+                appDataSubdirectory: appDataSubDirectory,
+                logger: _logger,
+                requireSigned: requireSigned
+            );
         }
 
         [STAThread]
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
index 35d0713..fdc2c3d 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
@@ -286,6 +286,15 @@ namespace WelsonJS.Launcher.Properties {
             }
         }
         
+        /// <summary>
+        ///   false과(와) 유사한 지역화된 문자열을 찾습니다.
+        /// </summary>
+        internal static string NativeRequireSigned {
+            get {
+                return ResourceManager.GetString("NativeRequireSigned", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   https://github.com/gnh1201/welsonjs과(와) 유사한 지역화된 문자열을 찾습니다.
         /// </summary>
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
index d198f04..dc3dc74 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
@@ -208,4 +208,7 @@
   <data name="ChromiumDevToolsTimeout" xml:space="preserve">
     <value>5</value>
   </data>
+  <data name="NativeRequireSigned" xml:space="preserve">
+    <value>false</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
index 6d23016..be77132 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
@@ -60,13 +60,13 @@ namespace WelsonJS.Launcher
             }, TaskScheduler.Default);
 
             // Add resource tools
-            _tools.Add(new ResourceTools.Completion(this, _httpClient));
-            _tools.Add(new ResourceTools.Settings(this, _httpClient));
-            _tools.Add(new ResourceTools.ChromiumDevTools(this, _httpClient));
-            _tools.Add(new ResourceTools.DnsQuery(this, _httpClient));
-            _tools.Add(new ResourceTools.IpQuery(this, _httpClient));
-            _tools.Add(new ResourceTools.TwoFactorAuth(this, _httpClient));
-            _tools.Add(new ResourceTools.Whois(this, _httpClient));
+            _tools.Add(new ResourceTools.Completion(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.Settings(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.ChromiumDevTools(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.DnsQuery(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.IpQuery(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.TwoFactorAuth(this, _httpClient, _logger));
+            _tools.Add(new ResourceTools.Whois(this, _httpClient, _logger));
 
             // Register the prefix
             _listener.Prefixes.Add(prefix);
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/ChromiumDevTools.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/ChromiumDevTools.cs
index 81feeb3..d56c5ec 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/ChromiumDevTools.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/ChromiumDevTools.cs
@@ -19,13 +19,16 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private readonly WebSocketManager _wsManager = new WebSocketManager();
         private const string Prefix = "devtools/";
 
-        public ChromiumDevTools(ResourceServer server, HttpClient httpClient)
+        public ChromiumDevTools(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
         }
 
         public bool CanHandle(string path)
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Completion.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Completion.cs
index 57bb482..34abe58 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Completion.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Completion.cs
@@ -22,13 +22,16 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "completion/";
         private readonly ConcurrentBag<string> DiscoveredExecutables = new ConcurrentBag<string>();
 
-        public Completion(ResourceServer server, HttpClient httpClient)
+        public Completion(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
 
             Task.Run(async () => await SafeDiscoverAsync(DiscoverFromInstalledSoftware));
             Task.Run(async () => await SafeDiscoverAsync(DiscoverFromPathVariable));
@@ -160,7 +163,7 @@ namespace WelsonJS.Launcher.ResourceTools
         {
             if (!Directory.Exists(path))
             {
-                Trace.TraceInformation("Directory does not exist: {0}", path);
+                _logger.Info("Directory does not exist: {0}", path);
                 return;
             }
 
@@ -175,7 +178,7 @@ namespace WelsonJS.Launcher.ResourceTools
             }
             catch (Exception ex)
             {
-                Trace.TraceInformation("Error enumerating executables in '{0}': {1}", path, ex.Message);
+                _logger.Info("Error enumerating executables in '{0}': {1}", path, ex.Message);
             }
         }
 
@@ -195,7 +198,7 @@ namespace WelsonJS.Launcher.ResourceTools
             }
             catch (Exception ex)
             {
-                Trace.TraceError($"Discovery failed: {ex.Message}");
+                _logger.Error($"Discovery failed: {ex.Message}");
             }
         }
     }
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/DnsQuery.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/DnsQuery.cs
index 3b4c8b1..831294b 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/DnsQuery.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/DnsQuery.cs
@@ -18,16 +18,19 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "dns-query/";
         private string DnsServer;
         private const int DnsPort = 53;
         private const int Timeout = 5000;
         private static readonly Random _random = new Random();
 
-        public DnsQuery(ResourceServer server, HttpClient httpClient)
+        public DnsQuery(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
 
             DnsServer = Program.GetAppConfig("DnsServerAddress");
         }
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/IpQuery.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/IpQuery.cs
index 3a3aa6b..68d7400 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/IpQuery.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/IpQuery.cs
@@ -14,12 +14,15 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "ip-query/";
 
-        public IpQuery(ResourceServer server, HttpClient httpClient)
+        public IpQuery(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
         }
 
         public bool CanHandle(string path)
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Settings.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Settings.cs
index 2f74940..6d6fd94 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Settings.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Settings.cs
@@ -20,12 +20,15 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "settings";
 
-        public Settings(ResourceServer server, HttpClient httpClient)
+        public Settings(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
         }
 
         public bool CanHandle(string path)
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/TwoFactorAuth.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/TwoFactorAuth.cs
index e7094e2..aa44ba6 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/TwoFactorAuth.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/TwoFactorAuth.cs
@@ -19,14 +19,17 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "tfa/";
         private const string Base32Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
         private static readonly int[] ValidKeyCharLengths = new[] { 16, 32 };
 
-        public TwoFactorAuth(ResourceServer server, HttpClient httpClient)
+        public TwoFactorAuth(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
         }
 
         public bool CanHandle(string path)
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Whois.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Whois.cs
index 45ae8b9..fc82e85 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Whois.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceTools/Whois.cs
@@ -15,12 +15,15 @@ namespace WelsonJS.Launcher.ResourceTools
     {
         private readonly ResourceServer Server;
         private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
         private const string Prefix = "whois/";
 
-        public Whois(ResourceServer server, HttpClient httpClient)
+        public Whois(ResourceServer server, HttpClient httpClient, ICompatibleLogger logger)
         {
             Server = server;
+
             _httpClient = httpClient;
+            _logger = logger;
         }
 
         public bool CanHandle(string path)
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/TraceLogger.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/TraceLogger.cs
index 5f86237..6efbaf6 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/TraceLogger.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/TraceLogger.cs
@@ -6,7 +6,9 @@
 // We use the ICompatibleLogger interface to maintain a BCL-first style.
 // This allows for later replacement with logging libraries such as ILogger or Log4Net.
 // 
+using System;
 using System.Diagnostics;
+using System.Linq;
 
 namespace WelsonJS.Launcher
 {
@@ -21,7 +23,7 @@ namespace WelsonJS.Launcher
                 _logFileName = (typeof(TraceLogger).Namespace ?? "WelsonJS.Launcher") + ".log";
                 Trace.Listeners.Add(new TextWriterTraceListener(_logFileName));
             }
-            catch (System.Exception ex)
+            catch (Exception ex)
             {
                 // Fallback when the process cannot write to the working directory
                 Trace.Listeners.Add(new ConsoleTraceListener());
@@ -30,8 +32,27 @@ namespace WelsonJS.Launcher
             Trace.AutoFlush = true;
         }
 
-        public void Info(string message) => Trace.TraceInformation(message);
-        public void Warn(string message) => Trace.TraceWarning(message);
-        public void Error(string message) => Trace.TraceError(message);
+        public void Info(params object[] args) => Trace.TraceInformation(Format(args));
+        public void Warn(params object[] args) => Trace.TraceWarning(Format(args));
+        public void Error(params object[] args) => Trace.TraceError(Format(args));
+
+        private static string Format(object[] args)
+        {
+            if (args == null || args.Length == 0) return string.Empty;
+
+            if (args.Length == 1)
+                return args[0]?.ToString() ?? string.Empty;
+
+            string format = args[0]?.ToString() ?? string.Empty;
+            try
+            {
+                return string.Format(format, args.Skip(1).ToArray());
+            }
+            catch
+            {
+                // In case of mismatched format placeholders
+                return string.Join(" ", args);
+            }
+        }
     }
 }
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj b/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
index e9a04b4..0d5a5fc 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
@@ -88,6 +88,10 @@
   <ItemGroup>
     <Compile Include="ICompatibleLogger.cs" />
     <Compile Include="IResourceTool.cs" />
+    <Compile Include="JsCore.cs" />
+    <Compile Include="JsNative.cs" />
+    <Compile Include="JsSerializer.cs" />
+    <Compile Include="NativeBootstrap.cs" />
     <Compile Include="ResourceTools\IpQuery.cs" />
     <Compile Include="ResourceTools\Settings.cs" />
     <Compile Include="ResourceTools\Completion.cs" />
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/app.config b/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
index 8078a76..a26dab3 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
@@ -21,6 +21,7 @@
     <add key="CitiApiKey" value=""/>
     <add key="CitiApiPrefix" value="https://api.criminalip.io/v1/"/>
     <add key="DateTimeFormat" value="yyyy-MM-dd HH:mm:ss"/>
+    <add key="NativeRequireSigned" value="false"/>
   </appSettings>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>