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diff --git a/src/wallet/ringdb.h b/src/wallet/ringdb.h
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+// Copyright (c) 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.
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include <lmdb.h>
+#include "wipeable_string.h"
+#include "crypto/crypto.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+
+namespace tools
+{
+  class ringdb
+  {
+  public:
+    ringdb(std::string filename, const std::string &genesis);
+    ~ringdb();
+
+    bool add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
+    bool remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
+    bool get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+    bool set_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, const std::vector<uint64_t> &outs, bool relative);
+
+    bool blackball(const crypto::public_key &output);
+    bool unblackball(const crypto::public_key &output);
+    bool blackballed(const crypto::public_key &output);
+    bool clear_blackballs();
+
+  private:
+    bool blackball_worker(const crypto::public_key &output, int op);
+
+  private:
+    std::string filename;
+    MDB_env *env;
+    MDB_dbi dbi_rings;
+    MDB_dbi dbi_blackballs;
+  };
+}