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diff --git a/src/validationinterface.h b/src/validationinterface.h
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+++ b/src/validationinterface.h
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+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 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_VALIDATIONINTERFACE_H
+#define BITCOIN_VALIDATIONINTERFACE_H
+
+#include <boost/signals2/signal.hpp>
+
+class CBlock;
+class CBlockLocator;
+class CTransaction;
+class CValidationInterface;
+class CValidationState;
+class uint256;
+
+// These functions dispatch to one or all registered wallets
+
+/** Register a wallet to receive updates from core */
+void RegisterValidationInterface(CValidationInterface* pwalletIn);
+/** Unregister a wallet from core */
+void UnregisterValidationInterface(CValidationInterface* pwalletIn);
+/** Unregister all wallets from core */
+void UnregisterAllValidationInterfaces();
+/** Push an updated transaction to all registered wallets */
+void SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL);
+
+class CValidationInterface {
+protected:
+    virtual void SyncTransaction(const CTransaction &tx, const CBlock *pblock) {};
+    virtual void EraseFromWallet(const uint256 &hash) {};
+    virtual void SetBestChain(const CBlockLocator &locator) {};
+    virtual void UpdatedTransaction(const uint256 &hash) {};
+    virtual void Inventory(const uint256 &hash) {};
+    virtual void ResendWalletTransactions() {};
+    virtual void BlockChecked(const CBlock&, const CValidationState&) {};
+    friend void ::RegisterValidationInterface(CValidationInterface*);
+    friend void ::UnregisterValidationInterface(CValidationInterface*);
+    friend void ::UnregisterAllValidationInterfaces();
+};
+
+struct CMainSignals {
+    /** Notifies listeners of updated transaction data (transaction, and optionally the block it is found in. */
+    boost::signals2::signal<void (const CTransaction &, const CBlock *)> SyncTransaction;
+    /** Notifies listeners of an erased transaction (currently disabled, requires transaction replacement). */
+    boost::signals2::signal<void (const uint256 &)> EraseTransaction;
+    /** Notifies listeners of an updated transaction without new data (for now: a coinbase potentially becoming visible). */
+    boost::signals2::signal<void (const uint256 &)> UpdatedTransaction;
+    /** Notifies listeners of a new active block chain. */
+    boost::signals2::signal<void (const CBlockLocator &)> SetBestChain;
+    /** Notifies listeners about an inventory item being seen on the network. */
+    boost::signals2::signal<void (const uint256 &)> Inventory;
+    /** Tells listeners to broadcast their data. */
+    boost::signals2::signal<void ()> Broadcast;
+    /** Notifies listeners of a block validation result */
+    boost::signals2::signal<void (const CBlock&, const CValidationState&)> BlockChecked;
+};
+
+CMainSignals& GetMainSignals();
+
+#endif // BITCOIN_VALIDATIONINTERFACE_H