diff --git a/ccnx/ccnx-verifier.h b/ccnx/ccnx-verifier.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef CCNX_VERIFIER_H
+#define CCNX_VERIFIER_H
+
+#include "ccnx-common.h"
+#include "ccnx-wrapper.h"
+#include "ccnx-name.h"
+#include "ccnx-key.h"
+#include "ccnx-pco.h"
+#include <map>
+
+namespace Ccnx {
+
+class CcnxWrapper;
+
+// not thread-safe, don't want to add a mutex for KeyCache
+// which increases the possibility of dead-locking
+// ccnx-wrapper would take care of thread-safety issue
+class Verifier
+{
+public:
+  Verifier(CcnxWrapper *ccnx);
+  ~Verifier();
+
+  bool verify(const PcoPtr &pco);
+
+private:
+
+private:
+  CcnxWrapper *m_ccnx;
+  Hash m_rootKeyDigest;
+  typedef std::map<Hash, KeyPtr> KeyCache;
+  KeyCache m_keyCache;
+};
+
+} // Ccnx
+
+#endif // CCNX_VERIFIER_H