Hush witness rework, many thanks to @CryptoForge for this awesome code https://github.com/Cryptoforge-alt/pirate/tree/pirate_witness_rework

src/wallet/asyncrpcoperation_saplingconsolidation.h

@@ -0,0 +1,37 @@
+#include "amount.h"
+#include "asyncrpcoperation.h"
+#include "univalue.h"
+#include "zcash/Address.hpp"
+#include "zcash/zip32.h"
+
+//Default fee used for consolidation transactions
+static const CAmount DEFAULT_CONSOLIDATION_FEE = 0;
+extern CAmount fConsolidationTxFee;
+extern bool fConsolidationMapUsed;
+
+class AsyncRPCOperation_saplingconsolidation : public AsyncRPCOperation
+{
+public:
+    AsyncRPCOperation_saplingconsolidation(int targetHeight);
+    virtual ~AsyncRPCOperation_saplingconsolidation();
+
+    // We don't want to be copied or moved around
+    AsyncRPCOperation_saplingconsolidation(AsyncRPCOperation_saplingconsolidation const&) = delete;            // Copy construct
+    AsyncRPCOperation_saplingconsolidation(AsyncRPCOperation_saplingconsolidation&&) = delete;                 // Move construct
+    AsyncRPCOperation_saplingconsolidation& operator=(AsyncRPCOperation_saplingconsolidation const&) = delete; // Copy assign
+    AsyncRPCOperation_saplingconsolidation& operator=(AsyncRPCOperation_saplingconsolidation&&) = delete;      // Move assign
+
+    virtual void main();
+
+    virtual void cancel();
+
+    virtual UniValue getStatus() const;
+
+private:
+    int targetHeight_;
+
+    bool main_impl();
+
+    void setConsolidationResult(int numTxCreated, const CAmount& amountConsolidated, const std::vector<std::string>& consolidationTxIds);
+
+};