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diff --git a/src/rpc/auxpow_miner.h b/src/rpc/auxpow_miner.h
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+// Copyright (c) 2018 Daniel Kraft
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_RPC_AUXPOW_MINER_H
+#define BITCOIN_RPC_AUXPOW_MINER_H
+
+#include <miner.h>
+#include <script/script.h>
+#include <sync.h>
+#include <uint256.h>
+#include <univalue.h>
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace auxpow_tests
+{
+class AuxpowMinerForTest;
+}
+
+/**
+ * This class holds "global" state used to construct blocks for the auxpow
+ * mining RPCs and the map of already constructed blocks to look them up
+ * in the submitauxblock RPC.
+ *
+ * It is used as a singleton that is initialised during startup, taking the
+ * place of the previously real global and static variables.
+ */
+class AuxpowMiner
+{
+
+private:
+
+  /** The lock used for state in this object.  */
+  mutable CCriticalSection cs;
+  /** All currently "active" block templates.  */
+  std::vector<std::unique_ptr<CBlockTemplate>> templates;
+  /** Maps block hashes to pointers in vTemplates.  Does not own the memory.  */
+  std::map<uint256, const CBlock*> blocks;
+
+  /**
+   * The block we are "currently" working on.  This does not own the memory,
+   * instead, it points into an element of templates.
+   */
+  CBlock* pblockCur = nullptr;
+  /** The current extra nonce for block creation.  */
+  unsigned extraNonce = 0;
+
+  /* Some data about when the current block (pblock) was constructed.  */
+  unsigned txUpdatedLast;
+  const CBlockIndex* pindexPrev = nullptr;
+  uint64_t startTime;
+
+  /**
+   * Constructs a new current block if necessary (checking the current state to
+   * see if "enough changed" for this), and returns a pointer to the block
+   * that should be returned to a miner for working on at the moment.  Also
+   * fills in the difficulty target value.
+   */
+  const CBlock* getCurrentBlock (const CScript& scriptPubKey, uint256& target);
+
+  /**
+   * Looks up a previously constructed block by its (hex-encoded) hash.  If the
+   * block is found, it is returned.  Otherwise, a JSONRPCError is thrown.
+   */
+  const CBlock* lookupSavedBlock (const std::string& hashHex) const;
+
+  friend class auxpow_tests::AuxpowMinerForTest;
+
+public:
+
+  AuxpowMiner () = default;
+
+  /**
+   * Performs the main work for the "createauxblock" RPC:  Construct a new block
+   * to work on with the given address for the block reward and return the
+   * necessary information for the miner to construct an auxpow for it.
+   */
+  UniValue createAuxBlock (const CScript& scriptPubKey);
+
+  /**
+   * Performs the main work for the "submitauxblock" RPC:  Look up the block
+   * previously created for the given hash, attach the given auxpow to it
+   * and try to submit it.  Returns true if all was successful and the block
+   * was accepted.
+   */
+  bool submitAuxBlock (const std::string& hashHex,
+                       const std::string& auxpowHex) const;
+
+};
+
+#endif // BITCOIN_RPC_AUXPOW_MINER_H