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+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_RPC_BLOCKCHAIN_H
+#define BITCOIN_RPC_BLOCKCHAIN_H
+
+class CBlock;
+class CBlockIndex;
+class CScript;
+class CTransaction;
+class uint256;
+class UniValue;
+
+/**
+ * Get the difficulty of the net wrt to the given block index, or the chain tip if
+ * not provided.
+ *
+ * @return A floating point number that is a multiple of the main net minimum
+ * difficulty (4295032833 hashes).
+ */
+double GetDifficulty(const CBlockIndex* blockindex = nullptr);
+
+/** Callback for when block tip changed. */
+void RPCNotifyBlockChange(bool ibd, const CBlockIndex *);
+
+/** Block description to JSON */
+UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false);
+
+/** Mempool information to JSON */
+UniValue mempoolInfoToJSON();
+
+/** Mempool to JSON */
+UniValue mempoolToJSON(bool fVerbose = false);
+
+/** Block header to JSON */
+UniValue blockheaderToJSON(const CBlockIndex* blockindex);
+
+#endif
+