diff --git a/src/coins.cpp b/src/coins.cpp
index ad5b8f18b..bd77f0bfe 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -50,7 +50,7 @@ bool CCoinsView::BatchWrite(CCoinsMap &mapCoins,
                             const uint256 &hashBlock,
                             const uint256 &hashAnchor,
                             CAnchorsMap &mapAnchors,
-                            CNullifiersMap &mapSerials) { return false; }
+                            CNullifiersMap &mapNullifiers) { return false; }
 bool CCoinsView::GetStats(CCoinsStats &stats) const { return false; }
 
 
@@ -67,7 +67,7 @@ bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins,
                                   const uint256 &hashBlock,
                                   const uint256 &hashAnchor,
                                   CAnchorsMap &mapAnchors,
-                                  CNullifiersMap &mapSerials) { return base->BatchWrite(mapCoins, hashBlock, hashAnchor, mapAnchors, mapSerials); }
+                                  CNullifiersMap &mapNullifiers) { return base->BatchWrite(mapCoins, hashBlock, hashAnchor, mapAnchors, mapNullifiers); }
 bool CCoinsViewBacked::GetStats(CCoinsStats &stats) const { return base->GetStats(stats); }
 
 CCoinsKeyHasher::CCoinsKeyHasher() : salt(GetRandHash()) {}
@@ -260,7 +260,7 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
                                  const uint256 &hashBlockIn,
                                  const uint256 &hashAnchorIn,
                                  CAnchorsMap &mapAnchors,
-                                 CNullifiersMap &mapSerials) {
+                                 CNullifiersMap &mapNullifiers) {
     assert(!hasModifier);
     for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
         if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
@@ -326,7 +326,7 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
         mapAnchors.erase(itOld);
     }
 
-    for (CNullifiersMap::iterator child_it = mapSerials.begin(); child_it != mapSerials.end();)
+    for (CNullifiersMap::iterator child_it = mapNullifiers.begin(); child_it != mapNullifiers.end();)
     {
         if (child_it->second.flags & CSerialsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
             CNullifiersMap::iterator parent_it = cacheSerials.find(child_it->first);
@@ -348,7 +348,7 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
             }
         }
         CNullifiersMap::iterator itOld = child_it++;
-        mapSerials.erase(itOld);
+        mapNullifiers.erase(itOld);
     }
 
     hashAnchor = hashAnchorIn;
diff --git a/src/coins.h b/src/coins.h
index f00372100..4e0dd63d1 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -368,7 +368,7 @@ public:
                             const uint256 &hashBlock,
                             const uint256 &hashAnchor,
                             CAnchorsMap &mapAnchors,
-                            CNullifiersMap &mapSerials);
+                            CNullifiersMap &mapNullifiers);
 
     //! Calculate statistics about the unspent transaction output set
     virtual bool GetStats(CCoinsStats &stats) const;
@@ -397,7 +397,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapSerials);
+                    CNullifiersMap &mapNullifiers);
     bool GetStats(CCoinsStats &stats) const;
 };
 
@@ -461,7 +461,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapSerials);
+                    CNullifiersMap &mapNullifiers);
 
 
     // Adds the tree to mapAnchors and sets the current commitment
diff --git a/src/main.cpp b/src/main.cpp
index 3b50dc48f..326318fd8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1106,7 +1106,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
     }
     BOOST_FOREACH(const JSDescription &pour, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &serial, pour.nullifiers) {
-            if (pool.mapSerials.count(serial))
+            if (pool.mapNullifiers.count(serial))
             {
                 return false;
             }
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index 4ab9832a3..4e6d8fe04 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -24,7 +24,7 @@ class CCoinsViewTest : public CCoinsView
     uint256 hashBestAnchor_;
     std::map<uint256, CCoins> map_;
     std::map<uint256, ZCIncrementalMerkleTree> mapAnchors_;
-    std::map<uint256, bool> mapSerials_;
+    std::map<uint256, bool> mapNullifiers_;
 
 public:
     CCoinsViewTest() {
@@ -49,9 +49,9 @@ public:
 
     bool GetNullifier(const uint256 &serial) const
     {
-        std::map<uint256, bool>::const_iterator it = mapSerials_.find(serial);
+        std::map<uint256, bool>::const_iterator it = mapNullifiers_.find(serial);
 
-        if (it == mapSerials_.end()) {
+        if (it == mapNullifiers_.end()) {
             return false;
         } else {
             // The map shouldn't contain any false entries.
@@ -88,7 +88,7 @@ public:
                     const uint256& hashBlock,
                     const uint256& hashAnchor,
                     CAnchorsMap& mapAnchors,
-                    CNullifiersMap& mapSerials)
+                    CNullifiersMap& mapNullifiers)
     {
         for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end(); ) {
             map_[it->first] = it->second.coins;
@@ -109,17 +109,17 @@ public:
             }
             mapAnchors.erase(it++);
         }
-        for (CNullifiersMap::iterator it = mapSerials.begin(); it != mapSerials.end(); ) {
+        for (CNullifiersMap::iterator it = mapNullifiers.begin(); it != mapNullifiers.end(); ) {
             if (it->second.entered) {
-                mapSerials_[it->first] = true;
+                mapNullifiers_[it->first] = true;
             } else {
-                mapSerials_.erase(it->first);
+                mapNullifiers_.erase(it->first);
             }
-            mapSerials.erase(it++);
+            mapNullifiers.erase(it++);
         }
         mapCoins.clear();
         mapAnchors.clear();
-        mapSerials.clear();
+        mapNullifiers.clear();
         hashBestBlock_ = hashBlock;
         hashBestAnchor_ = hashAnchor;
         return true;
diff --git a/src/txdb.cpp b/src/txdb.cpp
index af5e9119c..df02c4a5a 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -114,7 +114,7 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins,
                               const uint256 &hashBlock,
                               const uint256 &hashAnchor,
                               CAnchorsMap &mapAnchors,
-                              CNullifiersMap &mapSerials) {
+                              CNullifiersMap &mapNullifiers) {
     CLevelDBBatch batch;
     size_t count = 0;
     size_t changed = 0;
@@ -137,13 +137,13 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins,
         mapAnchors.erase(itOld);
     }
 
-    for (CNullifiersMap::iterator it = mapSerials.begin(); it != mapSerials.end();) {
+    for (CNullifiersMap::iterator it = mapNullifiers.begin(); it != mapNullifiers.end();) {
         if (it->second.flags & CSerialsCacheEntry::DIRTY) {
             BatchWriteSerial(batch, it->first, it->second.entered);
             // TODO: changed++?
         }
         CNullifiersMap::iterator itOld = it++;
-        mapSerials.erase(itOld);
+        mapNullifiers.erase(itOld);
     }
 
     if (!hashBlock.IsNull())
diff --git a/src/txdb.h b/src/txdb.h
index 4402b119f..293ceb850 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -44,7 +44,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapSerials);
+                    CNullifiersMap &mapNullifiers);
     bool GetStats(CCoinsStats &stats) const;
 };
 
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 6f38c0e9f..373fd7a80 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -101,7 +101,7 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
         mapNextTx[tx.vin[i].prevout] = CInPoint(&tx, i);
     BOOST_FOREACH(const JSDescription &pour, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &serial, pour.nullifiers) {
-            mapSerials[serial] = &tx;
+            mapNullifiers[serial] = &tx;
         }
     }
     nTransactionsUpdated++;
@@ -150,7 +150,7 @@ void CTxMemPool::remove(const CTransaction &origTx, std::list<CTransaction>& rem
                 mapNextTx.erase(txin.prevout);
             BOOST_FOREACH(const JSDescription& pour, tx.vjoinsplit) {
                 BOOST_FOREACH(const uint256& serial, pour.nullifiers) {
-                    mapSerials.erase(serial);
+                    mapNullifiers.erase(serial);
                 }
             }
 
@@ -232,8 +232,8 @@ void CTxMemPool::removeConflicts(const CTransaction &tx, std::list<CTransaction>
 
     BOOST_FOREACH(const JSDescription &pour, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &serial, pour.nullifiers) {
-            std::map<uint256, const CTransaction*>::iterator it = mapSerials.find(serial);
-            if (it != mapSerials.end()) {
+            std::map<uint256, const CTransaction*>::iterator it = mapNullifiers.find(serial);
+            if (it != mapNullifiers.end()) {
                 const CTransaction &txConflict = *it->second;
                 if (txConflict != tx)
                 {
@@ -370,7 +370,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
         assert(it->first == it->second.ptx->vin[it->second.n].prevout);
     }
 
-    for (std::map<uint256, const CTransaction*>::const_iterator it = mapSerials.begin(); it != mapSerials.end(); it++) {
+    for (std::map<uint256, const CTransaction*>::const_iterator it = mapNullifiers.begin(); it != mapNullifiers.end(); it++) {
         uint256 hash = it->second->GetHash();
         map<uint256, CTxMemPoolEntry>::const_iterator it2 = mapTx.find(hash);
         const CTransaction& tx = it2->second.GetTx();
@@ -485,7 +485,7 @@ bool CTxMemPool::HasNoInputsOf(const CTransaction &tx) const
 CCoinsViewMemPool::CCoinsViewMemPool(CCoinsView *baseIn, CTxMemPool &mempoolIn) : CCoinsViewBacked(baseIn), mempool(mempoolIn) { }
 
 bool CCoinsViewMemPool::GetNullifier(const uint256 &serial) const {
-    if (mempool.mapSerials.count(serial))
+    if (mempool.mapNullifiers.count(serial))
         return true;
 
     return base->GetNullifier(serial);
diff --git a/src/txmempool.h b/src/txmempool.h
index f2ff7ffd2..a6901fde6 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -98,7 +98,7 @@ public:
     mutable CCriticalSection cs;
     std::map<uint256, CTxMemPoolEntry> mapTx;
     std::map<COutPoint, CInPoint> mapNextTx;
-    std::map<uint256, const CTransaction*> mapSerials;
+    std::map<uint256, const CTransaction*> mapNullifiers;
     std::map<uint256, std::pair<double, CAmount> > mapDeltas;
 
     CTxMemPool(const CFeeRate& _minRelayFee);