diff --git a/src/zmq/zmqnotificationinterface.cpp b/src/zmq/zmqnotificationinterface.cpp
index 0939071e0..634fd795c 100644
--- a/src/zmq/zmqnotificationinterface.cpp
+++ b/src/zmq/zmqnotificationinterface.cpp
@@ -1,188 +1,171 @@
 // Copyright (c) 2015-2018 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <zmq/zmqnotificationinterface.h>
 #include <zmq/zmqpublishnotifier.h>
 
 #include <primitives/block.h>
 #include <util/system.h>
 
 void zmqError(const char *str) {
     LogPrint(BCLog::ZMQ, "zmq: Error: %s, errno=%s\n", str,
              zmq_strerror(errno));
 }
 
 CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(nullptr) {}
 
 CZMQNotificationInterface::~CZMQNotificationInterface() {
     Shutdown();
-
-    for (std::list<CZMQAbstractNotifier *>::iterator i = notifiers.begin();
-         i != notifiers.end(); ++i) {
-        delete *i;
-    }
 }
 
 std::list<const CZMQAbstractNotifier *>
 CZMQNotificationInterface::GetActiveNotifiers() const {
     std::list<const CZMQAbstractNotifier *> result;
-    for (const auto *n : notifiers) {
-        result.push_back(n);
+    for (const auto &n : notifiers) {
+        result.push_back(n.get());
     }
     return result;
 }
 
 CZMQNotificationInterface *CZMQNotificationInterface::Create() {
-    CZMQNotificationInterface *notificationInterface = nullptr;
     std::map<std::string, CZMQNotifierFactory> factories;
-    std::list<CZMQAbstractNotifier *> notifiers;
-
     factories["pubhashblock"] =
         CZMQAbstractNotifier::Create<CZMQPublishHashBlockNotifier>;
     factories["pubhashtx"] =
         CZMQAbstractNotifier::Create<CZMQPublishHashTransactionNotifier>;
     factories["pubrawblock"] =
         CZMQAbstractNotifier::Create<CZMQPublishRawBlockNotifier>;
     factories["pubrawtx"] =
         CZMQAbstractNotifier::Create<CZMQPublishRawTransactionNotifier>;
 
+    std::list<std::unique_ptr<CZMQAbstractNotifier>> notifiers;
     for (const auto &entry : factories) {
         std::string arg("-zmq" + entry.first);
         if (gArgs.IsArgSet(arg)) {
             CZMQNotifierFactory factory = entry.second;
             std::string address = gArgs.GetArg(arg, "");
             CZMQAbstractNotifier *notifier = factory();
             notifier->SetType(entry.first);
             notifier->SetAddress(address);
             notifier->SetOutboundMessageHighWaterMark(
                 static_cast<int>(gArgs.GetArg(
                     arg + "hwm", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM)));
-            notifiers.push_back(notifier);
+            notifiers.emplace_back(notifier);
         }
     }
 
     if (!notifiers.empty()) {
-        notificationInterface = new CZMQNotificationInterface();
-        notificationInterface->notifiers = notifiers;
+        std::unique_ptr<CZMQNotificationInterface> notificationInterface(
+            new CZMQNotificationInterface());
+        notificationInterface->notifiers = std::move(notifiers);
 
-        if (!notificationInterface->Initialize()) {
-            delete notificationInterface;
-            notificationInterface = nullptr;
+        if (notificationInterface->Initialize()) {
+            return notificationInterface.release();
         }
     }
 
-    return notificationInterface;
+    return nullptr;
 }
 
 // Called at startup to conditionally set up ZMQ socket(s)
 bool CZMQNotificationInterface::Initialize() {
     int major = 0, minor = 0, patch = 0;
     zmq_version(&major, &minor, &patch);
     LogPrint(BCLog::ZMQ, "zmq: version %d.%d.%d\n", major, minor, patch);
 
     LogPrint(BCLog::ZMQ, "zmq: Initialize notification interface\n");
     assert(!pcontext);
 
     pcontext = zmq_ctx_new();
 
     if (!pcontext) {
         zmqError("Unable to initialize context");
         return false;
     }
 
-    std::list<CZMQAbstractNotifier *>::iterator i = notifiers.begin();
-    for (; i != notifiers.end(); ++i) {
-        CZMQAbstractNotifier *notifier = *i;
+    for (auto &notifier : notifiers) {
         if (notifier->Initialize(pcontext)) {
             LogPrint(BCLog::ZMQ, "zmq: Notifier %s ready (address = %s)\n",
                      notifier->GetType(), notifier->GetAddress());
         } else {
             LogPrint(BCLog::ZMQ, "zmq: Notifier %s failed (address = %s)\n",
                      notifier->GetType(), notifier->GetAddress());
-            break;
+            return false;
         }
     }
 
-    if (i != notifiers.end()) {
-        return false;
-    }
-
     return true;
 }
 
 // Called during shutdown sequence
 void CZMQNotificationInterface::Shutdown() {
     LogPrint(BCLog::ZMQ, "zmq: Shutdown notification interface\n");
     if (pcontext) {
-        for (std::list<CZMQAbstractNotifier *>::iterator i = notifiers.begin();
-             i != notifiers.end(); ++i) {
-            CZMQAbstractNotifier *notifier = *i;
+        for (auto &notifier : notifiers) {
             LogPrint(BCLog::ZMQ, "zmq: Shutdown notifier %s at %s\n",
                      notifier->GetType(), notifier->GetAddress());
             notifier->Shutdown();
         }
         zmq_ctx_term(pcontext);
 
         pcontext = nullptr;
     }
 }
 
 void CZMQNotificationInterface::UpdatedBlockTip(const CBlockIndex *pindexNew,
                                                 const CBlockIndex *pindexFork,
                                                 bool fInitialDownload) {
     // In IBD or blocks were disconnected without any new ones
     if (fInitialDownload || pindexNew == pindexFork) {
         return;
     }
 
-    for (std::list<CZMQAbstractNotifier *>::iterator i = notifiers.begin();
-         i != notifiers.end();) {
-        CZMQAbstractNotifier *notifier = *i;
+    for (auto i = notifiers.begin(); i != notifiers.end();) {
+        CZMQAbstractNotifier *notifier = i->get();
         if (notifier->NotifyBlock(pindexNew)) {
             i++;
         } else {
             notifier->Shutdown();
             i = notifiers.erase(i);
         }
     }
 }
 
 void CZMQNotificationInterface::TransactionAddedToMempool(
     const CTransactionRef &ptx) {
     // Used by BlockConnected and BlockDisconnected as well, because they're all
     // the same external callback.
     const CTransaction &tx = *ptx;
 
-    for (std::list<CZMQAbstractNotifier *>::iterator i = notifiers.begin();
-         i != notifiers.end();) {
-        CZMQAbstractNotifier *notifier = *i;
+    for (auto i = notifiers.begin(); i != notifiers.end();) {
+        CZMQAbstractNotifier *notifier = i->get();
         if (notifier->NotifyTransaction(tx)) {
             i++;
         } else {
             notifier->Shutdown();
             i = notifiers.erase(i);
         }
     }
 }
 
 void CZMQNotificationInterface::BlockConnected(
     const std::shared_ptr<const CBlock> &pblock,
     const CBlockIndex *pindexConnected) {
     for (const CTransactionRef &ptx : pblock->vtx) {
         // Do a normal notify for each transaction added in the block
         TransactionAddedToMempool(ptx);
     }
 }
 
 void CZMQNotificationInterface::BlockDisconnected(
     const std::shared_ptr<const CBlock> &pblock,
     const CBlockIndex *pindexDisconnected) {
     for (const CTransactionRef &ptx : pblock->vtx) {
         // Do a normal notify for each transaction removed in block
         // disconnection
         TransactionAddedToMempool(ptx);
     }
 }
 
 CZMQNotificationInterface *g_zmq_notification_interface = nullptr;
diff --git a/src/zmq/zmqnotificationinterface.h b/src/zmq/zmqnotificationinterface.h
index 117d5bc3b..e0f3fa371 100644
--- a/src/zmq/zmqnotificationinterface.h
+++ b/src/zmq/zmqnotificationinterface.h
@@ -1,46 +1,47 @@
 // Copyright (c) 2015-2018 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_ZMQ_ZMQNOTIFICATIONINTERFACE_H
 #define BITCOIN_ZMQ_ZMQNOTIFICATIONINTERFACE_H
 
 #include <validationinterface.h>
 
 #include <list>
+#include <memory>
 
 class CBlockIndex;
 class CZMQAbstractNotifier;
 
 class CZMQNotificationInterface final : public CValidationInterface {
 public:
     virtual ~CZMQNotificationInterface();
 
     std::list<const CZMQAbstractNotifier *> GetActiveNotifiers() const;
 
     static CZMQNotificationInterface *Create();
 
 protected:
     bool Initialize();
     void Shutdown();
 
     // CValidationInterface
     void TransactionAddedToMempool(const CTransactionRef &tx) override;
     void BlockConnected(const std::shared_ptr<const CBlock> &pblock,
                         const CBlockIndex *pindexConnected) override;
     void BlockDisconnected(const std::shared_ptr<const CBlock> &pblock,
                            const CBlockIndex *pindexDisconnected) override;
     void UpdatedBlockTip(const CBlockIndex *pindexNew,
                          const CBlockIndex *pindexFork,
                          bool fInitialDownload) override;
 
 private:
     CZMQNotificationInterface();
 
     void *pcontext;
-    std::list<CZMQAbstractNotifier *> notifiers;
+    std::list<std::unique_ptr<CZMQAbstractNotifier>> notifiers;
 };
 
 extern CZMQNotificationInterface *g_zmq_notification_interface;
 
 #endif // BITCOIN_ZMQ_ZMQNOTIFICATIONINTERFACE_H
diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index 4ff10648d..c412f9626 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -1,217 +1,222 @@
 // Copyright (c) 2015-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <zmq/zmqpublishnotifier.h>
 
 #include <blockdb.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <primitives/blockhash.h>
 #include <primitives/txid.h>
 #include <rpc/server.h>
 #include <streams.h>
 #include <util/system.h>
+#include <zmq.h>
 
 #include <cstdarg>
+#include <cstddef>
+#include <map>
+#include <string>
+#include <utility>
 
 static std::multimap<std::string, CZMQAbstractPublishNotifier *>
     mapPublishNotifiers;
 
 static const char *MSG_HASHBLOCK = "hashblock";
 static const char *MSG_HASHTX = "hashtx";
 static const char *MSG_RAWBLOCK = "rawblock";
 static const char *MSG_RAWTX = "rawtx";
 
 // Internal function to send multipart message
 static int zmq_send_multipart(void *sock, const void *data, size_t size, ...) {
     va_list args;
     va_start(args, size);
 
     while (1) {
         zmq_msg_t msg;
 
         int rc = zmq_msg_init_size(&msg, size);
         if (rc != 0) {
             zmqError("Unable to initialize ZMQ msg");
             va_end(args);
             return -1;
         }
 
         void *buf = zmq_msg_data(&msg);
         memcpy(buf, data, size);
 
         data = va_arg(args, const void *);
 
         rc = zmq_msg_send(&msg, sock, data ? ZMQ_SNDMORE : 0);
         if (rc == -1) {
             zmqError("Unable to send ZMQ msg");
             zmq_msg_close(&msg);
             va_end(args);
             return -1;
         }
 
         zmq_msg_close(&msg);
 
         if (!data) {
             break;
         }
 
         size = va_arg(args, size_t);
     }
     va_end(args);
     return 0;
 }
 
 bool CZMQAbstractPublishNotifier::Initialize(void *pcontext) {
     assert(!psocket);
 
     // check if address is being used by other publish notifier
     std::multimap<std::string, CZMQAbstractPublishNotifier *>::iterator i =
         mapPublishNotifiers.find(address);
 
     if (i == mapPublishNotifiers.end()) {
         psocket = zmq_socket(pcontext, ZMQ_PUB);
         if (!psocket) {
             zmqError("Failed to create socket");
             return false;
         }
 
         LogPrint(BCLog::ZMQ,
                  "zmq: Outbound message high water mark for %s at %s is %d\n",
                  type, address, outbound_message_high_water_mark);
 
         int rc = zmq_setsockopt(psocket, ZMQ_SNDHWM,
                                 &outbound_message_high_water_mark,
                                 sizeof(outbound_message_high_water_mark));
         if (rc != 0) {
             zmqError("Failed to set outbound message high water mark");
             zmq_close(psocket);
             return false;
         }
 
         rc = zmq_bind(psocket, address.c_str());
         if (rc != 0) {
             zmqError("Failed to bind address");
             zmq_close(psocket);
             return false;
         }
 
         // register this notifier for the address, so it can be reused for other
         // publish notifier
         mapPublishNotifiers.insert(std::make_pair(address, this));
         return true;
     } else {
         LogPrint(BCLog::ZMQ, "zmq: Reusing socket for address %s\n", address);
         LogPrint(BCLog::ZMQ,
                  "zmq: Outbound message high water mark for %s at %s is %d\n",
                  type, address, outbound_message_high_water_mark);
 
         psocket = i->second->psocket;
         mapPublishNotifiers.insert(std::make_pair(address, this));
 
         return true;
     }
 }
 
 void CZMQAbstractPublishNotifier::Shutdown() {
     // Early return if Initialize was not called
     if (!psocket) {
         return;
     }
 
     int count = mapPublishNotifiers.count(address);
 
     // remove this notifier from the list of publishers using this address
     typedef std::multimap<std::string, CZMQAbstractPublishNotifier *>::iterator
         iterator;
     std::pair<iterator, iterator> iterpair =
         mapPublishNotifiers.equal_range(address);
 
     for (iterator it = iterpair.first; it != iterpair.second; ++it) {
         if (it->second == this) {
             mapPublishNotifiers.erase(it);
             break;
         }
     }
 
     if (count == 1) {
         LogPrint(BCLog::ZMQ, "zmq: Close socket at address %s\n", address);
         int linger = 0;
         zmq_setsockopt(psocket, ZMQ_LINGER, &linger, sizeof(linger));
         zmq_close(psocket);
     }
 
     psocket = nullptr;
 }
 
 bool CZMQAbstractPublishNotifier::SendMessage(const char *command,
                                               const void *data, size_t size) {
     assert(psocket);
 
     /* send three parts, command & data & a LE 4byte sequence number */
     uint8_t msgseq[sizeof(uint32_t)];
     WriteLE32(&msgseq[0], nSequence);
     int rc = zmq_send_multipart(psocket, command, strlen(command), data, size,
                                 msgseq, (size_t)sizeof(uint32_t), nullptr);
     if (rc == -1) {
         return false;
     }
 
     /* increment memory only sequence number after sending */
     nSequence++;
 
     return true;
 }
 
 bool CZMQPublishHashBlockNotifier::NotifyBlock(const CBlockIndex *pindex) {
     BlockHash hash = pindex->GetBlockHash();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashblock %s\n", hash.GetHex());
     char data[32];
     for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = hash.begin()[i];
     }
     return SendMessage(MSG_HASHBLOCK, data, 32);
 }
 
 bool CZMQPublishHashTransactionNotifier::NotifyTransaction(
     const CTransaction &transaction) {
     TxId txid = transaction.GetId();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashtx %s\n", txid.GetHex());
     char data[32];
     for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = txid.begin()[i];
     }
     return SendMessage(MSG_HASHTX, data, 32);
 }
 
 bool CZMQPublishRawBlockNotifier::NotifyBlock(const CBlockIndex *pindex) {
     LogPrint(BCLog::ZMQ, "zmq: Publish rawblock %s\n",
              pindex->GetBlockHash().GetHex());
 
     const Config &config = GetConfig();
     CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
     {
         LOCK(cs_main);
         CBlock block;
         if (!ReadBlockFromDisk(block, pindex,
                                config.GetChainParams().GetConsensus())) {
             zmqError("Can't read block from disk");
             return false;
         }
 
         ss << block;
     }
 
     return SendMessage(MSG_RAWBLOCK, &(*ss.begin()), ss.size());
 }
 
 bool CZMQPublishRawTransactionNotifier::NotifyTransaction(
     const CTransaction &transaction) {
     TxId txid = transaction.GetId();
     LogPrint(BCLog::ZMQ, "zmq: Publish rawtx %s\n", txid.GetHex());
     CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
     ss << transaction;
     return SendMessage(MSG_RAWTX, &(*ss.begin()), ss.size());
 }