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diff --git a/src/rpc/message_data_structs.h b/src/rpc/message_data_structs.h
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+// Copyright (c) 2016-2017, 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.
+
+#pragma once
+
+#include "crypto/hash.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "ringct/rctSigs.h"
+
+#include <unordered_map>
+#include <vector>
+
+namespace cryptonote
+{
+
+namespace rpc
+{
+
+  struct block_with_transactions
+  {
+    cryptonote::block block;
+    std::unordered_map<crypto::hash, cryptonote::transaction> transactions;
+  };
+
+  typedef std::vector<uint64_t> tx_output_indices;
+
+  typedef std::vector<tx_output_indices> block_output_indices;
+
+  struct transaction_info
+  {
+    cryptonote::transaction transaction;
+    bool in_pool;
+    uint64_t height;
+  };
+
+  struct output_key_and_amount_index
+  {
+    uint64_t amount_index;
+    crypto::public_key key;
+  };
+
+  typedef std::vector<output_key_and_amount_index> outputs_for_amount;
+
+  struct amount_with_random_outputs
+  {
+    uint64_t amount;
+    outputs_for_amount outputs;
+  };
+
+  struct peer
+  {
+    uint64_t id;
+    uint32_t ip;
+    uint16_t port;
+    uint64_t last_seen;
+  };
+
+  struct tx_in_pool
+  {
+    cryptonote::transaction tx;
+    crypto::hash tx_hash;
+    uint64_t blob_size;
+    uint64_t fee;
+    crypto::hash max_used_block_hash;
+    uint64_t max_used_block_height;
+    bool kept_by_block;
+    crypto::hash last_failed_block_hash;
+    uint64_t last_failed_block_height;
+    uint64_t receive_time;
+    uint64_t last_relayed_time;
+    bool relayed;
+    bool do_not_relay;
+  };
+
+  typedef std::unordered_map<crypto::key_image, std::vector<crypto::hash> > key_images_with_tx_hashes;
+
+  struct output_amount_count
+  {
+    uint64_t amount;
+    uint64_t total_count;
+    uint64_t unlocked_count;
+    uint64_t recent_count;
+  };
+
+  struct output_amount_and_index
+  {
+    uint64_t amount;
+    uint64_t index;
+  };
+
+  struct output_key_mask_unlocked
+  {
+    crypto::public_key key;
+    rct::key mask;
+    bool unlocked;
+  };
+
+  struct hard_fork_info
+  {
+    uint8_t version;
+    bool enabled;
+    uint32_t window;
+    uint32_t votes;
+    uint32_t threshold;
+    uint8_t voting;
+    uint32_t state;
+    uint64_t earliest_height;
+  };
+
+  //required by JSON-RPC 2.0 spec
+  struct error
+  {
+    // not really using code, maybe later.
+    error() : use(false), code(1) { }
+
+    bool use;  // do not serialize
+
+    int32_t code;
+
+    // not required by spec, but int error codes aren't perfect
+    std::string error_str;
+
+    std::string message;
+
+    //TODO: data member?  not required, may want later.
+  };
+
+  struct BlockHeaderResponse
+  {
+    uint64_t major_version;
+    uint64_t minor_version;
+    uint64_t timestamp;
+    crypto::hash  prev_id;
+    uint32_t nonce;
+    uint64_t height;
+    uint64_t depth;
+    crypto::hash hash;
+    uint64_t difficulty;
+    uint64_t reward;
+  };
+
+}  // namespace rpc
+
+}  // namespace cryptonote