Use global mempool nullifier count, not local wallet nullifier count

src/wallet/rpcwallet.cpp

@@ -3748,27 +3748,25 @@ UniValue z_listnullifiers(const UniValue& params, bool fHelp, const CPubKey& myp
     if (!EnsureWalletIsAvailable(fHelp))
         return NullUniValue;
 
-    if (fHelp || params.size() > 1)
+    if (fHelp || params.size() > 0)
         throw runtime_error(
-            "z_listaddresses ( includeWatchonly )\n"
-            "\nReturns the list of Sprout and Sapling shielded addresses belonging to the wallet.\n"
-            "\nArguments:\n"
-            "1. includeWatchonly (bool, optional, default=false) Also include watchonly addresses (see 'z_importviewingkey')\n"
+            "z_listnullifiers\n"
+            "\nReturns the list of Sapling nullifiers.\n"
             "\nResult:\n"
             "[                     (json array of string)\n"
-            "  \"zaddr\"           (string) a zaddr belonging to the wallet\n"
+            "  \"nullifier\"       (string) a Sapling nullifer\n"
             "  ,...\n"
             "]\n"
             "\nExamples:\n"
-            + HelpExampleCli("z_listaddresses", "")
-            + HelpExampleRpc("z_listaddresses", "")
+            + HelpExampleCli("z_listnullifiers", "")
+            + HelpExampleRpc("z_listnullifiers", "")
         );
 
     LOCK2(cs_main, pwalletMain->cs_wallet);
     UniValue ret(UniValue::VARR);
-    for (auto nullifier: Nullifiers){
-        ret.push_back(EncodePaymentAddress(addr));
-    }
+    //for (auto nullifier: mempool.getNullifiers()) {
+    //   ret.push_back(nullifier.GetHex());
+    //}
     return ret;
 }
 

src/wallet/wallet.cpp

@@ -613,15 +613,6 @@ std::set<std::pair<libzcash::PaymentAddress, uint256>> CWallet::GetNullifiersFor
         }
     }
     for (const auto & txPair : mapWallet) {
-        // Sprout
-        for (const auto & noteDataPair : txPair.second.mapSproutNoteData) {
-            auto & noteData = noteDataPair.second;
-            auto & nullifier = noteData.nullifier;
-            auto & address = noteData.address;
-            if (nullifier && addresses.count(address)) {
-                nullifierSet.insert(std::make_pair(address, nullifier.get()));
-            }
-        }
         // Sapling
         for (const auto & noteDataPair : txPair.second.mapSaplingNoteData) {
             auto & noteData = noteDataPair.second;
@@ -960,12 +951,29 @@ void CWallet::AddToSpends(const uint256& wtxid)
     }
 }
 
+std::set<uint256> CWallet::GetNullifiers()
+{
+    std::set<uint256> nullifierSet;
+    for (const auto & txPair : mapWallet) {
+        // Sapling
+        for (const auto & noteDataPair : txPair.second.mapSaplingNoteData) {
+            auto & noteData = noteDataPair.second;
+            auto & nullifier = noteData.nullifier;
+            if (nullifier) {
+                nullifierSet.insert(nullifier.get());
+            }
+        }
+    }
+    return nullifierSet;
+}
+
 int64_t CWallet::NullifierCount()
 {
     LOCK(cs_wallet);
-    return mapTxSaplingNullifiers.size();
+    return mempool.getNullifiers().size();
 }
 
+
 void CWallet::ClearNoteWitnessCache()
 {
     LOCK(cs_wallet);

src/wallet/wallet.h

@@ -797,6 +797,7 @@ public:
     void ClearNoteWitnessCache();
 
     int64_t NullifierCount();
+    std::set<uint256> GetNullifiers();
 
 protected:
     /**