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diff --git a/src/device/device_cold.hpp b/src/device/device_cold.hpp
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+// Copyright (c) 2017-2018, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef MONERO_DEVICE_COLD_H
+#define MONERO_DEVICE_COLD_H
+
+#include "wallet/wallet2.h"
+#include <boost/function.hpp>
+
+
+namespace hw {
+
+  typedef struct wallet_shim {
+    boost::function<crypto::public_key (const tools::wallet2::transfer_details &td)> get_tx_pub_key_from_received_outs;
+  } wallet_shim;
+
+  class tx_aux_data {
+  public:
+    std::vector<std::string> tx_device_aux;  // device generated aux data
+    std::vector<cryptonote::address_parse_info> tx_recipients;  // as entered by user
+  };
+
+  class device_cold {
+  public:
+
+    using exported_key_image = std::vector<std::pair<crypto::key_image, crypto::signature>>;
+
+    /**
+     * Key image sync with the cold protocol.
+     */
+    virtual void ki_sync(wallet_shim * wallet,
+                 const std::vector<::tools::wallet2::transfer_details> & transfers,
+                 exported_key_image & ski) =0;
+
+    /**
+     * Signs unsigned transaction with the cold protocol.
+     */
+    virtual void tx_sign(wallet_shim * wallet,
+                 const ::tools::wallet2::unsigned_tx_set & unsigned_tx,
+                 ::tools::wallet2::signed_tx_set & signed_tx,
+                 tx_aux_data & aux_data) =0;
+  };
+}
+
+#endif //MONERO_DEVICE_COLD_H