diff --git a/src/miner.cpp b/src/miner.cpp
index 8aa581c5fc..fab10b1043 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -255,6 +255,7 @@ BlockAssembler::TxAllowedForNamecoin (const CTransaction& tx) const
   if (nameOutFound && nameOpOut.getNameOp () == OP_NAME_FIRSTUPDATE)
     {
       bool nameNewFound = false;
+      LOCK (cs_main);
       const auto& coinsTip = ::ChainstateActive ().CoinsTip ();
       for (const auto& txIn : tx.vin)
         {
diff --git a/src/names/main.h b/src/names/main.h
index 060bffe576..a1a13614ac 100644
--- a/src/names/main.h
+++ b/src/names/main.h
@@ -9,6 +9,7 @@
 #include <names/common.h>
 #include <primitives/transaction.h>
 #include <serialize.h>
+#include <sync.h>
 
 #include <set>
 
@@ -105,7 +106,7 @@ void ApplyNameTransaction (const CTransaction& tx, unsigned nHeight,
 /**
  * Expire all names at the given height.  This removes their coins
  * from the UTXO set.
- * @param height The new block height.
+ * @param nHeight The new block height.
  * @param view The coins view to update.
  * @param undo The block undo object to record undo information.
  * @param names List all expired names here.
@@ -132,6 +133,6 @@ bool UnexpireNames (unsigned nHeight, CBlockUndo& undo,
  * this throws an assertion failure.
  * @param disconnect Whether we are disconnecting blocks.
  */
-void CheckNameDB (ChainstateManager& chainman, bool disconnect);
+void CheckNameDB (ChainstateManager& chainman, bool disconnect) EXCLUSIVE_LOCKS_REQUIRED (cs_main);
 
 #endif // H_BITCOIN_NAMES_MAIN
diff --git a/src/names/mempool.cpp b/src/names/mempool.cpp
index c27060d4dc..5d4be1cc69 100644
--- a/src/names/mempool.cpp
+++ b/src/names/mempool.cpp
@@ -36,7 +36,7 @@ namespace
  * there is any.  The txid must be for an entry in the mempool.
  */
 COutPoint
-getNameOutput (const CTxMemPool& pool, const uint256& txid)
+getNameOutput (const CTxMemPool& pool, const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -102,7 +102,7 @@ CNameMemPool::lastNameOutput (const valtype& name) const
 }
 
 void
-CNameMemPool::addUnchecked (const CTxMemPoolEntry& entry)
+CNameMemPool::addUnchecked (const CTxMemPoolEntry& entry) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -137,7 +137,7 @@ CNameMemPool::addUnchecked (const CTxMemPoolEntry& entry)
 }
 
 void
-CNameMemPool::remove (const CTxMemPoolEntry& entry)
+CNameMemPool::remove (const CTxMemPoolEntry& entry) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -162,7 +162,7 @@ CNameMemPool::remove (const CTxMemPoolEntry& entry)
 }
 
 void
-CNameMemPool::removeConflicts (const CTransaction& tx)
+CNameMemPool::removeConflicts (const CTransaction& tx) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -188,7 +188,7 @@ CNameMemPool::removeConflicts (const CTransaction& tx)
 }
 
 void
-CNameMemPool::removeUnexpireConflicts (const std::set<valtype>& unexpired)
+CNameMemPool::removeUnexpireConflicts (const std::set<valtype>& unexpired) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -209,7 +209,7 @@ CNameMemPool::removeUnexpireConflicts (const std::set<valtype>& unexpired)
 }
 
 void
-CNameMemPool::removeExpireConflicts (const std::set<valtype>& expired)
+CNameMemPool::removeExpireConflicts (const std::set<valtype>& expired) EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -238,7 +238,7 @@ CNameMemPool::removeExpireConflicts (const std::set<valtype>& expired)
 }
 
 void
-CNameMemPool::check (ChainstateManager& chainman, CChainState& active_chainstate) const
+CNameMemPool::check (ChainstateManager& chainman, CChainState& active_chainstate) const EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
@@ -309,7 +309,7 @@ CNameMemPool::check (ChainstateManager& chainman, CChainState& active_chainstate
 }
 
 bool
-CNameMemPool::checkTx (const CTransaction& tx) const
+CNameMemPool::checkTx (const CTransaction& tx) const EXCLUSIVE_LOCKS_REQUIRED (pool.cs)
 {
   AssertLockHeld (pool.cs);
 
diff --git a/src/names/mempool.h b/src/names/mempool.h
index 7475565489..d753695d05 100644
--- a/src/names/mempool.h
+++ b/src/names/mempool.h
@@ -147,6 +147,7 @@ class CNameMemPool
    */
   void removeConflicts (const CTransaction& tx);
 
+
   /**
    * Removes conflicts in the mempool due to unexpired names.  This removes
    * conflicting name registrations that are no longer possible.
diff --git a/src/rest.cpp b/src/rest.cpp
index a232de922b..ba4c148adc 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -741,6 +741,7 @@ static bool rest_name(const std::any& context, HTTPRequest* req, const std::stri
         return RESTERR(req, HTTP_BAD_REQUEST,
                        "Invalid encoded name: " + encodedName);
 
+    LOCK (cs_main);
     CNameData data;
     if (!::ChainstateActive ().CoinsTip ().GetName(plainName, data))
         return RESTERR(req, HTTP_NOT_FOUND,
diff --git a/src/txdb.h b/src/txdb.h
index 37a1725c3a..b2b74cef86 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -65,7 +65,7 @@ class CCoinsViewDB final : public CCoinsView
     CNameIterator* IterateNames() const override;
     bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock, const CNameCache &names) override;
     CCoinsViewCursor *Cursor() const override;
-    bool ValidateNameDB(ChainstateManager& chainman, const std::function<void()>& interruption_point) const override;
+    bool ValidateNameDB(ChainstateManager& chainman, const std::function<void()>& interruption_point) const override EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     //! Attempt to update from an older database format. Returns whether an error occurred.
     bool Upgrade();