diff --git a/.idea/.idea.BasicBlockChain/.idea/.gitignore b/.idea/.idea.BasicBlockChain/.idea/.gitignore
new file mode 100644
index 0000000..e50b8a7
--- /dev/null
+++ b/.idea/.idea.BasicBlockChain/.idea/.gitignore
@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/modules.xml
+/contentModel.xml
+/projectSettingsUpdater.xml
+/.idea.BasicBlockChain.iml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/.idea/.idea.BasicBlockChain/.idea/encodings.xml b/.idea/.idea.BasicBlockChain/.idea/encodings.xml
new file mode 100644
index 0000000..df87cf9
--- /dev/null
+++ b/.idea/.idea.BasicBlockChain/.idea/encodings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>
\ No newline at end of file
diff --git a/.idea/.idea.BasicBlockChain/.idea/indexLayout.xml b/.idea/.idea.BasicBlockChain/.idea/indexLayout.xml
new file mode 100644
index 0000000..7b08163
--- /dev/null
+++ b/.idea/.idea.BasicBlockChain/.idea/indexLayout.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/.idea.BasicBlockChain/.idea/vcs.xml b/.idea/.idea.BasicBlockChain/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/.idea.BasicBlockChain/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/BasicBlockChain.Core/BasicBlockChain.Core.csproj b/BasicBlockChain.Core/BasicBlockChain.Core.csproj
index 4749761..4f837a8 100644
--- a/BasicBlockChain.Core/BasicBlockChain.Core.csproj
+++ b/BasicBlockChain.Core/BasicBlockChain.Core.csproj
@@ -33,11 +33,11 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Net" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
-    <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
     <Reference Include="VAR.Json, Version=1.2.0.1065, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>..\packages\VAR.Json.1.2.0.1065\lib\net461\VAR.Json.dll</HintPath>
@@ -46,6 +46,7 @@
   <ItemGroup>
     <Compile Include="Block.cs" />
     <Compile Include="BlockChain.cs" />
+    <Compile Include="P2PNode.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Transaction.cs" />
   </ItemGroup>
diff --git a/BasicBlockChain.Core/P2PNode.cs b/BasicBlockChain.Core/P2PNode.cs
new file mode 100644
index 0000000..17d19a2
--- /dev/null
+++ b/BasicBlockChain.Core/P2PNode.cs
@@ -0,0 +1,131 @@
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+
+namespace BasicBlockChain.Core
+{
+    public class NetNode
+    {
+        private PeerAddress _nodeAddress = null;
+
+        private List<NetPeer> _peers = new List<NetPeer>();
+
+        private Socket _listen = null;
+
+        private Thread _thread = null;
+        private bool _running = false;
+
+        public NetNode(PeerAddress nodeAddress)
+        {
+            _nodeAddress = nodeAddress;
+
+            StartListening();
+
+            _running = true;
+            _thread = new Thread(Run);
+            _thread.Start();
+        }
+
+        public void AddPeer(PeerAddress peerAddress)
+        {
+            NetPeer newPeer = new NetPeer(_nodeAddress, peerAddress);
+            lock (_peers)
+            {
+                _peers.Add(newPeer);
+            }
+        }
+
+        private void StartListening()
+        {
+            _listen = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+            _listen.Bind(new IPEndPoint(IPAddress.Any, _nodeAddress.Port));
+            _listen.Listen(1000);
+        }
+
+        private void Run()
+        {
+            while (_running)
+            {
+                if (_listen.Poll(100, SelectMode.SelectRead) == false) { continue; }
+
+                Socket newSock = _listen.Accept();
+
+                NetPeer newPeer = new NetPeer(_nodeAddress, null, newSock);
+                lock (_peers)
+                {
+                    _peers.Add(newPeer);
+                }
+            }
+        }
+    }
+
+    public class PeerAddress
+    {
+        public string Address { get; set; }
+        public int Port { get; set; }
+    }
+
+    public class NetPeer
+    {
+        private PeerAddress _nodeAddress = null;
+        private PeerAddress _peerAddress = null;
+
+        private Socket _socket = null;
+
+        private Thread _thread = null;
+        private bool _running = false;
+
+        private enum PeerStatus
+        {
+            None,
+            SendingId,
+            WaitingId,
+            Idle,
+            Ended,
+        };
+        private PeerStatus _status = PeerStatus.None;
+
+        public NetPeer(PeerAddress nodeAddress, PeerAddress peerAddress, Socket socket = null)
+        {
+            _nodeAddress = nodeAddress;
+            _peerAddress = peerAddress;
+
+            _socket = socket;
+
+            _status = PeerStatus.Idle;
+            if (_socket == null)
+            {
+                ConnectPeer();
+                _status = PeerStatus.SendingId;
+            }
+            if (peerAddress == null)
+            {
+                _status = PeerStatus.WaitingId;
+            }
+
+            _socket.Blocking = false;
+            _socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
+
+            _running = true;
+            _thread = new Thread(Run);
+            _thread.Start();
+        }
+
+        private void ConnectPeer()
+        {
+            IPAddress ipAddress = IPAddress.Parse(_peerAddress.Address);
+            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+            _socket.Connect(ipAddress, _peerAddress.Port);
+        }
+
+        private void Run()
+        {
+            while (_running)
+            {
+                _socket.Poll(1, SelectMode.SelectRead);
+                // TODO
+            }
+        }
+    }
+}
diff --git a/BasicBlockChain.sln.DotSettings.user b/BasicBlockChain.sln.DotSettings.user
new file mode 100644
index 0000000..43ca5bb
--- /dev/null
+++ b/BasicBlockChain.sln.DotSettings.user
@@ -0,0 +1,4 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=135c9ccb_002Da4bf_002D4bc5_002Dacf7_002De923283d2c6b/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="All tests from Solution" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;
+  &lt;Solution /&gt;
+&lt;/SessionState&gt;</s:String></wpf:ResourceDictionary>
\ No newline at end of file