diff --git a/src/trust-tree-node.hpp b/src/trust-tree-node.hpp
new file mode 100644
index 0000000..2fe455a
--- /dev/null
+++ b/src/trust-tree-node.hpp
@@ -0,0 +1,116 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Yingdi Yu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#ifndef CHRONOS_TRUST_TREE_NODE_HPP
+#define CHRONOS_TRUST_TREE_NODE_HPP
+
+#include "common.hpp"
+
+namespace chronos {
+
+class TrustTreeNode;
+
+typedef std::vector<shared_ptr<TrustTreeNode> > TrustTreeNodeList;
+
+class TrustTreeNode
+{
+public:
+  TrustTreeNode()
+    : m_level(-1)
+    , m_visited(false)
+  {
+  }
+
+  TrustTreeNode(const Name& name)
+    : m_name(name)
+    , m_level(-1)
+    , m_visited(false)
+  {
+  }
+
+  ~TrustTreeNode()
+  {
+  }
+
+  const Name&
+  name()
+  {
+    return m_name;
+  }
+
+  void
+  addIntroducee(const shared_ptr<TrustTreeNode>& introducee)
+  {
+    m_introducees.push_back(introducee);
+  }
+
+  TrustTreeNodeList&
+  getIntroducees()
+  {
+    return m_introducees;
+  }
+
+  void
+  addIntroducer(const shared_ptr<TrustTreeNode>& introducer)
+  {
+    m_introducers.push_back(introducer);
+  }
+
+  TrustTreeNodeList&
+  getIntroducers()
+  {
+    return m_introducers;
+  }
+
+  void
+  setLevel(int level)
+  {
+    m_level = level;
+  }
+
+  int
+  level()
+  {
+    return m_level;
+  }
+
+  void
+  setVisited()
+  {
+    m_visited = true;
+  }
+
+  void
+  resetVisited()
+  {
+    m_visited = false;
+  }
+
+  bool
+  visited()
+  {
+    return m_visited;
+  }
+
+public:
+  double x;
+  double y;
+
+private:
+  Name m_name;
+  TrustTreeNodeList m_introducees;
+  TrustTreeNodeList m_introducers;
+  int m_level;
+  bool m_visited;
+};
+
+} // namespace chronos
+
+#endif // CHRONOS_TRUST_TREE_NODE_HPP