refactor: De-globalize g_signals

30 files changed, 131 insertions, 154 deletions

diff --git a/src/bench/wallet_balance.cpp b/src/bench/wallet_balance.cpp
index bf2195293e..7a10b167a6 100644
--- a/src/bench/wallet_balance.cpp
+++ b/src/bench/wallet_balance.cpp
@@ -39,7 +39,8 @@ static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const b
         generatetoaddress(test_setup->m_node, address_mine.value_or(ADDRESS_WATCHONLY));
         generatetoaddress(test_setup->m_node, ADDRESS_WATCHONLY);
     }
-    SyncWithValidationInterfaceQueue();
+    // Calls SyncWithValidationInterfaceQueue
+    wallet.chain().waitForNotificationsIfTipChanged(uint256::ZERO);
 
     auto bal = GetBalance(wallet); // Cache
 
diff --git a/src/bitcoin-chainstate.cpp b/src/bitcoin-chainstate.cpp
index 577f398c1a..0514021a8e 100644
--- a/src/bitcoin-chainstate.cpp
+++ b/src/bitcoin-chainstate.cpp
@@ -74,10 +74,12 @@ int main(int argc, char* argv[])
     // Start the lightweight task scheduler thread
     scheduler.m_service_thread = std::thread(util::TraceThread, "scheduler", [&] { scheduler.serviceQueue(); });
 
+    CMainSignals validation_signals{};
+
     // Gather some entropy once per minute.
     scheduler.scheduleEvery(RandAddPeriodic, std::chrono::minutes{1});
 
-    GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
+    validation_signals.RegisterBackgroundSignalScheduler(scheduler);
 
     class KernelNotifications : public kernel::Notifications
     {
@@ -118,7 +120,7 @@ int main(int argc, char* argv[])
         .chainparams = *chainparams,
         .datadir = abs_datadir,
         .notifications = *notifications,
-        .signals = &GetMainSignals(),
+        .signals = &validation_signals,
     };
     const node::BlockManager::Options blockman_opts{
         .chainparams = chainman_opts.chainparams,
@@ -236,9 +238,9 @@ int main(int argc, char* argv[])
 
         bool new_block;
         auto sc = std::make_shared<submitblock_StateCatcher>(block.GetHash());
-        RegisterSharedValidationInterface(sc);
+        validation_signals.RegisterSharedValidationInterface(sc);
         bool accepted = chainman.ProcessNewBlock(blockptr, /*force_processing=*/true, /*min_pow_checked=*/true, /*new_block=*/&new_block);
-        UnregisterSharedValidationInterface(sc);
+        validation_signals.UnregisterSharedValidationInterface(sc);
         if (!new_block && accepted) {
             std::cerr << "duplicate" << std::endl;
             break;
@@ -291,7 +293,7 @@ epilogue:
     scheduler.stop();
     if (chainman.m_thread_load.joinable()) chainman.m_thread_load.join();
 
-    GetMainSignals().FlushBackgroundCallbacks();
+    validation_signals.FlushBackgroundCallbacks();
     {
         LOCK(cs_main);
         for (Chainstate* chainstate : chainman.GetAll()) {
@@ -301,5 +303,5 @@ epilogue:
             }
         }
     }
-    GetMainSignals().UnregisterBackgroundSignalScheduler();
+    validation_signals.UnregisterBackgroundSignalScheduler();
 }
diff --git a/src/index/base.cpp b/src/index/base.cpp
index bcfe7215be..2287437f8f 100644
--- a/src/index/base.cpp
+++ b/src/index/base.cpp
@@ -89,7 +89,7 @@ bool BaseIndex::Init()
         return &m_chain->context()->chainman->GetChainstateForIndexing());
     // Register to validation interface before setting the 'm_synced' flag, so that
     // callbacks are not missed once m_synced is true.
-    RegisterValidationInterface(this);
+    m_chain->context()->validation_signals->RegisterValidationInterface(this);
 
     CBlockLocator locator;
     if (!GetDB().ReadBestBlock(locator)) {
@@ -380,7 +380,7 @@ bool BaseIndex::BlockUntilSyncedToCurrentChain() const
     }
 
     LogPrintf("%s: %s is catching up on block notifications\n", __func__, GetName());
-    SyncWithValidationInterfaceQueue();
+    m_chain->context()->validation_signals->SyncWithValidationInterfaceQueue();
     return true;
 }
 
@@ -399,7 +399,9 @@ bool BaseIndex::StartBackgroundSync()
 
 void BaseIndex::Stop()
 {
-    UnregisterValidationInterface(this);
+    if (m_chain->context()->validation_signals) {
+        m_chain->context()->validation_signals->UnregisterValidationInterface(this);
+    }
 
     if (m_thread_sync.joinable()) {
         m_thread_sync.join();
diff --git a/src/init.cpp b/src/init.cpp
index 735177bfc0..a5eeef589a 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -291,7 +291,7 @@ void Shutdown(NodeContext& node)
 
     // Because these depend on each-other, we make sure that neither can be
     // using the other before destroying them.
-    if (node.peerman) UnregisterValidationInterface(node.peerman.get());
+    if (node.peerman && node.validation_signals) node.validation_signals->UnregisterValidationInterface(node.peerman.get());
     if (node.connman) node.connman->Stop();
 
     StopTorControl();
@@ -317,7 +317,9 @@ void Shutdown(NodeContext& node)
     // fee estimator from validation interface.
     if (node.fee_estimator) {
         node.fee_estimator->Flush();
-        UnregisterValidationInterface(node.fee_estimator.get());
+        if (node.validation_signals) {
+            node.validation_signals->UnregisterValidationInterface(node.fee_estimator.get());
+        }
     }
 
     // FlushStateToDisk generates a ChainStateFlushed callback, which we should avoid missing
@@ -332,7 +334,7 @@ void Shutdown(NodeContext& node)
 
     // After there are no more peers/RPC left to give us new data which may generate
     // CValidationInterface callbacks, flush them...
-    GetMainSignals().FlushBackgroundCallbacks();
+    if (node.validation_signals) node.validation_signals->FlushBackgroundCallbacks();
 
     // Stop and delete all indexes only after flushing background callbacks.
     if (g_txindex) {
@@ -367,17 +369,20 @@ void Shutdown(NodeContext& node)
 
 #if ENABLE_ZMQ
     if (g_zmq_notification_interface) {
-        UnregisterValidationInterface(g_zmq_notification_interface.get());
+        if (node.validation_signals) node.validation_signals->UnregisterValidationInterface(g_zmq_notification_interface.get());
         g_zmq_notification_interface.reset();
     }
 #endif
 
     node.chain_clients.clear();
-    UnregisterAllValidationInterfaces();
-    GetMainSignals().UnregisterBackgroundSignalScheduler();
+    if (node.validation_signals) {
+        node.validation_signals->UnregisterAllValidationInterfaces();
+        node.validation_signals->UnregisterBackgroundSignalScheduler();
+    }
     node.mempool.reset();
     node.fee_estimator.reset();
     node.chainman.reset();
+    node.validation_signals.reset();
     node.scheduler.reset();
     node.kernel.reset();
 
@@ -1158,7 +1163,10 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         }
     }, std::chrono::minutes{5});
 
-    GetMainSignals().RegisterBackgroundSignalScheduler(*node.scheduler);
+    assert(!node.validation_signals);
+    node.validation_signals = std::make_unique<CMainSignals>();
+    auto& validation_signals = *node.validation_signals;
+    validation_signals.RegisterBackgroundSignalScheduler(*node.scheduler);
 
     // Create client interfaces for wallets that are supposed to be loaded
     // according to -wallet and -disablewallet options. This only constructs
@@ -1264,7 +1272,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         // Flush estimates to disk periodically
         CBlockPolicyEstimator* fee_estimator = node.fee_estimator.get();
         node.scheduler->scheduleEvery([fee_estimator] { fee_estimator->FlushFeeEstimates(); }, FEE_FLUSH_INTERVAL);
-        RegisterValidationInterface(fee_estimator);
+        validation_signals.RegisterValidationInterface(fee_estimator);
     }
 
     // Check port numbers
@@ -1435,7 +1443,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         });
 
     if (g_zmq_notification_interface) {
-        RegisterValidationInterface(g_zmq_notification_interface.get());
+        validation_signals.RegisterValidationInterface(g_zmq_notification_interface.get());
     }
 #endif
 
@@ -1449,7 +1457,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         .chainparams = chainparams,
         .datadir = args.GetDataDirNet(),
         .notifications = *node.notifications,
-        .signals = &GetMainSignals(),
+        .signals = &validation_signals,
     };
     Assert(ApplyArgsManOptions(args, chainman_opts)); // no error can happen, already checked in AppInitParameterInteraction
 
@@ -1479,7 +1487,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
     CTxMemPool::Options mempool_opts{
         .check_ratio = chainparams.DefaultConsistencyChecks() ? 1 : 0,
-        .signals = &GetMainSignals(),
+        .signals = &validation_signals,
     };
     auto result{ApplyArgsManOptions(args, chainparams, mempool_opts)};
     if (!result) {
@@ -1507,7 +1515,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
             // Drain the validation interface queue to ensure that the old indexes
             // don't have any pending work.
-            SyncWithValidationInterfaceQueue();
+            Assert(node.validation_signals)->SyncWithValidationInterfaceQueue();
 
             for (auto* index : node.indexes) {
                 index->Interrupt();
@@ -1596,7 +1604,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     node.peerman = PeerManager::make(*node.connman, *node.addrman,
                                      node.banman.get(), chainman,
                                      *node.mempool, peerman_opts);
-    RegisterValidationInterface(node.peerman.get());
+    validation_signals.RegisterValidationInterface(node.peerman.get());
 
     // ********************************************************* Step 8: start indexers
 
diff --git a/src/node/context.h b/src/node/context.h
index 4f3b640b2d..189e5e6ae4 100644
--- a/src/node/context.h
+++ b/src/node/context.h
@@ -20,6 +20,7 @@ class BanMan;
 class BaseIndex;
 class CBlockPolicyEstimator;
 class CConnman;
+class CMainSignals;
 class CScheduler;
 class CTxMemPool;
 class ChainstateManager;
@@ -70,7 +71,10 @@ struct NodeContext {
     interfaces::WalletLoader* wallet_loader{nullptr};
     std::unique_ptr<CScheduler> scheduler;
     std::function<void()> rpc_interruption_point = [] {};
+    //! Issues blocking calls about sync status, errors and warnings
     std::unique_ptr<KernelNotifications> notifications;
+    //! Issues calls about blocks and transactions
+    std::unique_ptr<CMainSignals> validation_signals;
     std::atomic<int> exit_status{EXIT_SUCCESS};
 
     //! Declare default constructor and destructor that are not inline, so code
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 5a8b7fc105..1814834f35 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -460,19 +460,20 @@ public:
 class NotificationsHandlerImpl : public Handler
 {
 public:
-    explicit NotificationsHandlerImpl(std::shared_ptr<Chain::Notifications> notifications)
-        : m_proxy(std::make_shared<NotificationsProxy>(std::move(notifications)))
+    explicit NotificationsHandlerImpl(CMainSignals& signals, std::shared_ptr<Chain::Notifications> notifications)
+        : m_signals{signals}, m_proxy{std::make_shared<NotificationsProxy>(std::move(notifications))}
     {
-        RegisterSharedValidationInterface(m_proxy);
+        m_signals.RegisterSharedValidationInterface(m_proxy);
     }
     ~NotificationsHandlerImpl() override { disconnect(); }
     void disconnect() override
     {
         if (m_proxy) {
-            UnregisterSharedValidationInterface(m_proxy);
+            m_signals.UnregisterSharedValidationInterface(m_proxy);
             m_proxy.reset();
         }
     }
+    CMainSignals& m_signals;
     std::shared_ptr<NotificationsProxy> m_proxy;
 };
 
@@ -761,12 +762,12 @@ public:
     }
     std::unique_ptr<Handler> handleNotifications(std::shared_ptr<Notifications> notifications) override
     {
-        return std::make_unique<NotificationsHandlerImpl>(std::move(notifications));
+        return std::make_unique<NotificationsHandlerImpl>(validation_signals(), std::move(notifications));
     }
     void waitForNotificationsIfTipChanged(const uint256& old_tip) override
     {
         if (!old_tip.IsNull() && old_tip == WITH_LOCK(::cs_main, return chainman().ActiveChain().Tip()->GetBlockHash())) return;
-        SyncWithValidationInterfaceQueue();
+        validation_signals().SyncWithValidationInterfaceQueue();
     }
     std::unique_ptr<Handler> handleRpc(const CRPCCommand& command) override
     {
@@ -822,6 +823,7 @@ public:
     NodeContext* context() override { return &m_node; }
     ArgsManager& args() { return *Assert(m_node.args); }
     ChainstateManager& chainman() { return *Assert(m_node.chainman); }
+    CMainSignals& validation_signals() { return *Assert(m_node.validation_signals); }
     NodeContext& m_node;
 };
 } // namespace
diff --git a/src/node/transaction.cpp b/src/node/transaction.cpp
index ef9a30a076..b66a4f2f39 100644
--- a/src/node/transaction.cpp
+++ b/src/node/transaction.cpp
@@ -92,7 +92,7 @@ TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef t
                 node.mempool->AddUnbroadcastTx(txid);
             }
 
-            if (wait_callback) {
+            if (wait_callback && node.validation_signals) {
                 // For transactions broadcast from outside the wallet, make sure
                 // that the wallet has been notified of the transaction before
                 // continuing.
@@ -101,7 +101,7 @@ TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef t
                 // with a transaction to/from their wallet, immediately call some
                 // wallet RPC, and get a stale result because callbacks have not
                 // yet been processed.
-                CallFunctionInValidationInterfaceQueue([&promise] {
+                node.validation_signals->CallFunctionInValidationInterfaceQueue([&promise] {
                     promise.set_value();
                 });
                 callback_set = true;
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 34d308211b..03ddb5d14b 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -395,7 +395,8 @@ static RPCHelpMan syncwithvalidationinterfacequeue()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
-    SyncWithValidationInterfaceQueue();
+    NodeContext& node = EnsureAnyNodeContext(request.context);
+    CHECK_NONFATAL(node.validation_signals)->SyncWithValidationInterfaceQueue();
     return UniValue::VNULL;
 },
     };
diff --git a/src/rpc/fees.cpp b/src/rpc/fees.cpp
index 57ba486ed9..f3345b4f1c 100644
--- a/src/rpc/fees.cpp
+++ b/src/rpc/fees.cpp
@@ -4,6 +4,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <core_io.h>
+#include <node/context.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
 #include <rpc/protocol.h>
@@ -21,10 +22,6 @@
 #include <cmath>
 #include <string>
 
-namespace node {
-struct NodeContext;
-}
-
 using node::NodeContext;
 
 static RPCHelpMan estimatesmartfee()
@@ -68,7 +65,7 @@ static RPCHelpMan estimatesmartfee()
             const NodeContext& node = EnsureAnyNodeContext(request.context);
             const CTxMemPool& mempool = EnsureMemPool(node);
 
-            SyncWithValidationInterfaceQueue();
+            CHECK_NONFATAL(mempool.m_signals)->SyncWithValidationInterfaceQueue();
             unsigned int max_target = fee_estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
             unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
             bool conservative = true;
@@ -156,8 +153,9 @@ static RPCHelpMan estimaterawfee()
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
         {
             CBlockPolicyEstimator& fee_estimator = EnsureAnyFeeEstimator(request.context);
+            const NodeContext& node = EnsureAnyNodeContext(request.context);
 
-            SyncWithValidationInterfaceQueue();
+            CHECK_NONFATAL(node.validation_signals)->SyncWithValidationInterfaceQueue();
             unsigned int max_target = fee_estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
             unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
             double threshold = 0.95;
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index f1abfb6396..084b899ae9 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -1038,9 +1038,9 @@ static RPCHelpMan submitblock()
 
     bool new_block;
     auto sc = std::make_shared<submitblock_StateCatcher>(block.GetHash());
-    RegisterSharedValidationInterface(sc);
+    CHECK_NONFATAL(chainman.m_options.signals)->RegisterSharedValidationInterface(sc);
     bool accepted = chainman.ProcessNewBlock(blockptr, /*force_processing=*/true, /*min_pow_checked=*/true, /*new_block=*/&new_block);
-    UnregisterSharedValidationInterface(sc);
+    CHECK_NONFATAL(chainman.m_options.signals)->UnregisterSharedValidationInterface(sc);
     if (!new_block && accepted) {
         return "duplicate";
     }
diff --git a/src/rpc/node.cpp b/src/rpc/node.cpp
index b085828215..ce9cda6b2c 100644
--- a/src/rpc/node.cpp
+++ b/src/rpc/node.cpp
@@ -90,7 +90,7 @@ static RPCHelpMan mockscheduler()
 
     const NodeContext& node_context{EnsureAnyNodeContext(request.context)};
     CHECK_NONFATAL(node_context.scheduler)->MockForward(std::chrono::seconds{delta_seconds});
-    SyncWithValidationInterfaceQueue();
+    CHECK_NONFATAL(node_context.validation_signals)->SyncWithValidationInterfaceQueue();
     for (const auto& chain_client : node_context.chain_clients) {
         chain_client->schedulerMockForward(std::chrono::seconds(delta_seconds));
     }
diff --git a/src/test/coinstatsindex_tests.cpp b/src/test/coinstatsindex_tests.cpp
index cc1ec49d41..08814c1499 100644
--- a/src/test/coinstatsindex_tests.cpp
+++ b/src/test/coinstatsindex_tests.cpp
@@ -70,7 +70,7 @@ BOOST_FIXTURE_TEST_CASE(coinstatsindex_initial_sync, TestChain100Setup)
     // SyncWithValidationInterfaceQueue() call below is also needed to ensure
     // TSAN always sees the test thread waiting for the notification thread, and
     // avoid potential false positive reports.
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     // Shutdown sequence (c.f. Shutdown() in init.cpp)
     coin_stats_index.Stop();
diff --git a/src/test/fuzz/package_eval.cpp b/src/test/fuzz/package_eval.cpp
index 9e658e0ced..a48ce37bce 100644
--- a/src/test/fuzz/package_eval.cpp
+++ b/src/test/fuzz/package_eval.cpp
@@ -47,7 +47,7 @@ void initialize_tx_pool()
             g_outpoints_coinbase_init_mature.push_back(prevout);
         }
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 struct OutpointsUpdater final : public CValidationInterface {
@@ -147,7 +147,7 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
     }
 
     auto outpoints_updater = std::make_shared<OutpointsUpdater>(mempool_outpoints);
-    RegisterSharedValidationInterface(outpoints_updater);
+    node.validation_signals->RegisterSharedValidationInterface(outpoints_updater);
 
     CTxMemPool tx_pool_{MakeMempool(fuzzed_data_provider, node)};
     MockedTxPool& tx_pool = *static_cast<MockedTxPool*>(&tx_pool_);
@@ -269,7 +269,7 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
         // Remember all added transactions
         std::set<CTransactionRef> added;
         auto txr = std::make_shared<TransactionsDelta>(added);
-        RegisterSharedValidationInterface(txr);
+        node.validation_signals->RegisterSharedValidationInterface(txr);
 
         // When there are multiple transactions in the package, we call ProcessNewPackage(txs, test_accept=false)
         // and AcceptToMemoryPool(txs.back(), test_accept=true). When there is only 1 transaction, we might flip it
@@ -285,8 +285,8 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
                                    /*bypass_limits=*/false, /*test_accept=*/!single_submit));
         const bool passed = res.m_result_type == MempoolAcceptResult::ResultType::VALID;
 
-        SyncWithValidationInterfaceQueue();
-        UnregisterSharedValidationInterface(txr);
+        node.validation_signals->SyncWithValidationInterfaceQueue();
+        node.validation_signals->UnregisterSharedValidationInterface(txr);
 
         // There is only 1 transaction in the package. We did a test-package-accept and a ATMP
         if (single_submit) {
@@ -310,7 +310,7 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
         CheckMempoolV3Invariants(tx_pool);
     }
 
-    UnregisterSharedValidationInterface(outpoints_updater);
+    node.validation_signals->UnregisterSharedValidationInterface(outpoints_updater);
 
     WITH_LOCK(::cs_main, tx_pool.check(chainstate.CoinsTip(), chainstate.m_chain.Height() + 1));
 }
diff --git a/src/test/fuzz/process_message.cpp b/src/test/fuzz/process_message.cpp
index 56b391ed5c..a467fd5382 100644
--- a/src/test/fuzz/process_message.cpp
+++ b/src/test/fuzz/process_message.cpp
@@ -47,7 +47,7 @@ void initialize_process_message()
     for (int i = 0; i < 2 * COINBASE_MATURITY; i++) {
         MineBlock(g_setup->m_node, CScript() << OP_TRUE);
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 FUZZ_TARGET(process_message, .init = initialize_process_message)
@@ -89,6 +89,6 @@ FUZZ_TARGET(process_message, .init = initialize_process_message)
         }
         g_setup->m_node.peerman->SendMessages(&p2p_node);
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
     g_setup->m_node.connman->StopNodes();
 }
diff --git a/src/test/fuzz/process_messages.cpp b/src/test/fuzz/process_messages.cpp
index 6b264907b5..38acd432fa 100644
--- a/src/test/fuzz/process_messages.cpp
+++ b/src/test/fuzz/process_messages.cpp
@@ -37,7 +37,7 @@ void initialize_process_messages()
     for (int i = 0; i < 2 * COINBASE_MATURITY; i++) {
         MineBlock(g_setup->m_node, CScript() << OP_TRUE);
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 FUZZ_TARGET(process_messages, .init = initialize_process_messages)
@@ -89,6 +89,6 @@ FUZZ_TARGET(process_messages, .init = initialize_process_messages)
             g_setup->m_node.peerman->SendMessages(&random_node);
         }
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
     g_setup->m_node.connman->StopNodes();
 }
diff --git a/src/test/fuzz/tx_pool.cpp b/src/test/fuzz/tx_pool.cpp
index b44b528b6f..039665bf9f 100644
--- a/src/test/fuzz/tx_pool.cpp
+++ b/src/test/fuzz/tx_pool.cpp
@@ -50,7 +50,7 @@ void initialize_tx_pool()
                               g_outpoints_coinbase_init_immature;
         outpoints.push_back(prevout);
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 struct TransactionsDelta final : public CValidationInterface {
@@ -105,7 +105,7 @@ void Finish(FuzzedDataProvider& fuzzed_data_provider, MockedTxPool& tx_pool, Cha
         assert(tx_pool.size() < info_all.size());
         WITH_LOCK(::cs_main, tx_pool.check(chainstate.CoinsTip(), chainstate.m_chain.Height() + 1));
     }
-    SyncWithValidationInterfaceQueue();
+    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 void MockTime(FuzzedDataProvider& fuzzed_data_provider, const Chainstate& chainstate)
@@ -285,7 +285,7 @@ FUZZ_TARGET(tx_pool_standard, .init = initialize_tx_pool)
         std::set<CTransactionRef> removed;
         std::set<CTransactionRef> added;
         auto txr = std::make_shared<TransactionsDelta>(removed, added);
-        RegisterSharedValidationInterface(txr);
+        node.validation_signals->RegisterSharedValidationInterface(txr);
         const bool bypass_limits = fuzzed_data_provider.ConsumeBool();
 
         // Make sure ProcessNewPackage on one transaction works.
@@ -303,8 +303,8 @@ FUZZ_TARGET(tx_pool_standard, .init = initialize_tx_pool)
 
         const auto res = WITH_LOCK(::cs_main, return AcceptToMemoryPool(chainstate, tx, GetTime(), bypass_limits, /*test_accept=*/false));
         const bool accepted = res.m_result_type == MempoolAcceptResult::ResultType::VALID;
-        SyncWithValidationInterfaceQueue();
-        UnregisterSharedValidationInterface(txr);
+        node.validation_signals->SyncWithValidationInterfaceQueue();
+        node.validation_signals->UnregisterSharedValidationInterface(txr);
 
         bool txid_in_mempool = tx_pool.exists(GenTxid::Txid(tx->GetHash()));
         bool wtxid_in_mempool = tx_pool.exists(GenTxid::Wtxid(tx->GetWitnessHash()));
diff --git a/src/test/peerman_tests.cpp b/src/test/peerman_tests.cpp
index 2c79329385..28866695bc 100644
--- a/src/test/peerman_tests.cpp
+++ b/src/test/peerman_tests.cpp
@@ -25,7 +25,7 @@ static void mineBlock(const node::NodeContext& node, std::chrono::seconds block_
     block.fChecked = true; // little speedup
     SetMockTime(curr_time); // process block at current time
     Assert(node.chainman->ProcessNewBlock(std::make_shared<const CBlock>(block), /*force_processing=*/true, /*min_pow_checked=*/true, nullptr));
-    SyncWithValidationInterfaceQueue(); // drain events queue
+    node.validation_signals->SyncWithValidationInterfaceQueue(); // drain events queue
 }
 
 // Verifying when network-limited peer connections are desirable based on the node's proximity to the tip
@@ -57,7 +57,7 @@ BOOST_AUTO_TEST_CASE(connections_desirable_service_flags)
 
     // By now, we tested that the connections desirable services flags change based on the node's time proximity to the tip.
     // Now, perform the same tests for when the node receives a block.
-    RegisterValidationInterface(peerman.get());
+    m_node.validation_signals->RegisterValidationInterface(peerman.get());
 
     // First, verify a block in the past doesn't enable limited peers connections
     // At this point, our time is (NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS + 1) * 10 minutes ahead the tip's time.
diff --git a/src/test/policyestimator_tests.cpp b/src/test/policyestimator_tests.cpp
index ede73c6895..6cadc3290a 100644
--- a/src/test/policyestimator_tests.cpp
+++ b/src/test/policyestimator_tests.cpp
@@ -20,7 +20,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
 {
     CBlockPolicyEstimator& feeEst = *Assert(m_node.fee_estimator);
     CTxMemPool& mpool = *Assert(m_node.mempool);
-    RegisterValidationInterface(&feeEst);
+    m_node.validation_signals->RegisterValidationInterface(&feeEst);
     TestMemPoolEntryHelper entry;
     CAmount basefee(2000);
     CAmount deltaFee(100);
@@ -74,7 +74,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
                                                                                       /*submitted_in_package=*/false,
                                                                                       /*chainstate_is_current=*/true,
                                                                                       /*has_no_mempool_parents=*/true)};
-                    GetMainSignals().TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
+                    m_node.validation_signals->TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
                 }
                 uint256 hash = tx.GetHash();
                 txHashes[j].push_back(hash);
@@ -102,7 +102,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
         // Check after just a few txs that combining buckets works as expected
         if (blocknum == 3) {
             // Wait for fee estimator to catch up
-            SyncWithValidationInterfaceQueue();
+            m_node.validation_signals->SyncWithValidationInterfaceQueue();
             // At this point we should need to combine 3 buckets to get enough data points
             // So estimateFee(1) should fail and estimateFee(2) should return somewhere around
             // 9*baserate.  estimateFee(2) %'s are 100,100,90 = average 97%
@@ -113,7 +113,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     }
 
     // Wait for fee estimator to catch up
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     std::vector<CAmount> origFeeEst;
     // Highest feerate is 10*baseRate and gets in all blocks,
@@ -146,7 +146,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     }
 
     // Wait for fee estimator to catch up
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 10;i++) {
@@ -175,7 +175,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
                                                                                       /*submitted_in_package=*/false,
                                                                                       /*chainstate_is_current=*/true,
                                                                                       /*has_no_mempool_parents=*/true)};
-                    GetMainSignals().TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
+                    m_node.validation_signals->TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
                 }
                 uint256 hash = tx.GetHash();
                 txHashes[j].push_back(hash);
@@ -188,7 +188,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     }
 
     // Wait for fee estimator to catch up
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     for (int i = 1; i < 10;i++) {
         BOOST_CHECK(feeEst.estimateFee(i) == CFeeRate(0) || feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
@@ -212,7 +212,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     block.clear();
 
     // Wait for fee estimator to catch up
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 10;i++) {
@@ -239,7 +239,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
                                                                                       /*submitted_in_package=*/false,
                                                                                       /*chainstate_is_current=*/true,
                                                                                       /*has_no_mempool_parents=*/true)};
-                    GetMainSignals().TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
+                    m_node.validation_signals->TransactionAddedToMempool(tx_info, mpool.GetAndIncrementSequence());
                 }
                 uint256 hash = tx.GetHash();
                 CTransactionRef ptx = mpool.get(hash);
@@ -257,7 +257,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
         block.clear();
     }
     // Wait for fee estimator to catch up
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
     BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 9; i++) { // At 9, the original estimate was already at the bottom (b/c scale = 2)
         BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() < origFeeEst[i-1] - deltaFee);
diff --git a/src/test/txindex_tests.cpp b/src/test/txindex_tests.cpp
index e2432a4718..5a32b02ad9 100644
--- a/src/test/txindex_tests.cpp
+++ b/src/test/txindex_tests.cpp
@@ -71,7 +71,7 @@ BOOST_FIXTURE_TEST_CASE(txindex_initial_sync, TestChain100Setup)
     // SyncWithValidationInterfaceQueue() call below is also needed to ensure
     // TSAN always sees the test thread waiting for the notification thread, and
     // avoid potential false positive reports.
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     // shutdown sequence (c.f. Shutdown() in init.cpp)
     txindex.Stop();
diff --git a/src/test/util/mining.cpp b/src/test/util/mining.cpp
index 08d1b4c902..ad7a38d3fe 100644
--- a/src/test/util/mining.cpp
+++ b/src/test/util/mining.cpp
@@ -95,12 +95,12 @@ COutPoint MineBlock(const NodeContext& node, std::shared_ptr<CBlock>& block)
     const auto old_height = WITH_LOCK(chainman.GetMutex(), return chainman.ActiveHeight());
     bool new_block;
     BlockValidationStateCatcher bvsc{block->GetHash()};
-    RegisterValidationInterface(&bvsc);
+    node.validation_signals->RegisterValidationInterface(&bvsc);
     const bool processed{chainman.ProcessNewBlock(block, true, true, &new_block)};
     const bool duplicate{!new_block && processed};
     assert(!duplicate);
-    UnregisterValidationInterface(&bvsc);
-    SyncWithValidationInterfaceQueue();
+    node.validation_signals->UnregisterValidationInterface(&bvsc);
+    node.validation_signals->SyncWithValidationInterfaceQueue();
     const bool was_valid{bvsc.m_state && bvsc.m_state->IsValid()};
     assert(old_height + was_valid == WITH_LOCK(chainman.GetMutex(), return chainman.ActiveHeight()));
 
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index b9c2659221..aad26f2013 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -171,7 +171,8 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
     // from blocking due to queue overrun.
     m_node.scheduler = std::make_unique<CScheduler>();
     m_node.scheduler->m_service_thread = std::thread(util::TraceThread, "scheduler", [&] { m_node.scheduler->serviceQueue(); });
-    GetMainSignals().RegisterBackgroundSignalScheduler(*m_node.scheduler);
+    m_node.validation_signals = std::make_unique<CMainSignals>();
+    m_node.validation_signals->RegisterBackgroundSignalScheduler(*m_node.scheduler);
 
     m_node.fee_estimator = std::make_unique<CBlockPolicyEstimator>(FeeestPath(*m_node.args), DEFAULT_ACCEPT_STALE_FEE_ESTIMATES);
     m_node.mempool = std::make_unique<CTxMemPool>(MemPoolOptionsForTest(m_node));
@@ -185,7 +186,7 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
         .datadir = m_args.GetDataDirNet(),
         .check_block_index = true,
         .notifications = *m_node.notifications,
-        .signals = &GetMainSignals(),
+        .signals = m_node.validation_signals.get(),
         .worker_threads_num = 2,
     };
     const BlockManager::Options blockman_opts{
@@ -203,8 +204,8 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
 ChainTestingSetup::~ChainTestingSetup()
 {
     if (m_node.scheduler) m_node.scheduler->stop();
-    GetMainSignals().FlushBackgroundCallbacks();
-    GetMainSignals().UnregisterBackgroundSignalScheduler();
+    m_node.validation_signals->FlushBackgroundCallbacks();
+    m_node.validation_signals->UnregisterBackgroundSignalScheduler();
     m_node.connman.reset();
     m_node.banman.reset();
     m_node.addrman.reset();
@@ -213,6 +214,7 @@ ChainTestingSetup::~ChainTestingSetup()
     m_node.mempool.reset();
     m_node.fee_estimator.reset();
     m_node.chainman.reset();
+    m_node.validation_signals.reset();
     m_node.scheduler.reset();
 }
 
diff --git a/src/test/util/txmempool.cpp b/src/test/util/txmempool.cpp
index 8c568c2eea..71cf8aca60 100644
--- a/src/test/util/txmempool.cpp
+++ b/src/test/util/txmempool.cpp
@@ -13,7 +13,6 @@
 #include <util/time.h>
 #include <util/translation.h>
 #include <validation.h>
-#include <validationinterface.h>
 
 using node::NodeContext;
 
@@ -23,7 +22,7 @@ CTxMemPool::Options MemPoolOptionsForTest(const NodeContext& node)
         // Default to always checking mempool regardless of
         // chainparams.DefaultConsistencyChecks for tests
         .check_ratio = 1,
-        .signals = &GetMainSignals(),
+        .signals = node.validation_signals.get(),
     };
     const auto result{ApplyArgsManOptions(*node.args, ::Params(), mempool_opts)};
     Assert(result);
diff --git a/src/test/validation_block_tests.cpp b/src/test/validation_block_tests.cpp
index 35e5c6a037..316ab86c2b 100644
--- a/src/test/validation_block_tests.cpp
+++ b/src/test/validation_block_tests.cpp
@@ -158,7 +158,7 @@ BOOST_AUTO_TEST_CASE(processnewblock_signals_ordering)
     bool ignored;
     // Connect the genesis block and drain any outstanding events
     BOOST_CHECK(Assert(m_node.chainman)->ProcessNewBlock(std::make_shared<CBlock>(Params().GenesisBlock()), true, true, &ignored));
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     // subscribe to events (this subscriber will validate event ordering)
     const CBlockIndex* initial_tip = nullptr;
@@ -167,7 +167,7 @@ BOOST_AUTO_TEST_CASE(processnewblock_signals_ordering)
         initial_tip = m_node.chainman->ActiveChain().Tip();
     }
     auto sub = std::make_shared<TestSubscriber>(initial_tip->GetBlockHash());
-    RegisterSharedValidationInterface(sub);
+    m_node.validation_signals->RegisterSharedValidationInterface(sub);
 
     // create a bunch of threads that repeatedly process a block generated above at random
     // this will create parallelism and randomness inside validation - the ValidationInterface
@@ -196,9 +196,9 @@ BOOST_AUTO_TEST_CASE(processnewblock_signals_ordering)
     for (auto& t : threads) {
         t.join();
     }
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
-    UnregisterSharedValidationInterface(sub);
+    m_node.validation_signals->UnregisterSharedValidationInterface(sub);
 
     LOCK(cs_main);
     BOOST_CHECK_EQUAL(sub->m_expected_tip, m_node.chainman->ActiveChain().Tip()->GetBlockHash());
diff --git a/src/test/validation_chainstatemanager_tests.cpp b/src/test/validation_chainstatemanager_tests.cpp
index 4bc0de6d9b..4bbab1cdcd 100644
--- a/src/test/validation_chainstatemanager_tests.cpp
+++ b/src/test/validation_chainstatemanager_tests.cpp
@@ -102,7 +102,7 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager, TestChain100Setup)
     BOOST_CHECK_EQUAL(active_tip2, c2.m_chain.Tip());
 
     // Let scheduler events finish running to avoid accessing memory that is going to be unloaded
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 }
 
 //! Test rebalancing the caches associated with each chainstate.
@@ -374,7 +374,7 @@ struct SnapshotTestSetup : TestChain100Setup {
                 cs->ForceFlushStateToDisk();
             }
             // Process all callbacks referring to the old manager before wiping it.
-            SyncWithValidationInterfaceQueue();
+            m_node.validation_signals->SyncWithValidationInterfaceQueue();
             LOCK(::cs_main);
             chainman.ResetChainstates();
             BOOST_CHECK_EQUAL(chainman.GetAll().size(), 0);
@@ -383,7 +383,7 @@ struct SnapshotTestSetup : TestChain100Setup {
                 .chainparams = ::Params(),
                 .datadir = chainman.m_options.datadir,
                 .notifications = *m_node.notifications,
-                .signals = &GetMainSignals(),
+                .signals = m_node.validation_signals.get(),
             };
             const BlockManager::Options blockman_opts{
                 .chainparams = chainman_opts.chainparams,
diff --git a/src/test/validationinterface_tests.cpp b/src/test/validationinterface_tests.cpp
index 5979441057..1e883c4f20 100644
--- a/src/test/validationinterface_tests.cpp
+++ b/src/test/validationinterface_tests.cpp
@@ -28,7 +28,7 @@ BOOST_AUTO_TEST_CASE(unregister_validation_interface_race)
         const CBlock block_dummy;
         BlockValidationState state_dummy;
         while (generate) {
-            GetMainSignals().BlockChecked(block_dummy, state_dummy);
+            m_node.validation_signals->BlockChecked(block_dummy, state_dummy);
         }
     }};
 
@@ -37,8 +37,8 @@ BOOST_AUTO_TEST_CASE(unregister_validation_interface_race)
         // keep going for about 1 sec, which is 250k iterations
         for (int i = 0; i < 250000; i++) {
             auto sub = std::make_shared<TestSubscriberNoop>();
-            RegisterSharedValidationInterface(sub);
-            UnregisterSharedValidationInterface(sub);
+            m_node.validation_signals->RegisterSharedValidationInterface(sub);
+            m_node.validation_signals->UnregisterSharedValidationInterface(sub);
         }
         // tell the other thread we are done
         generate = false;
@@ -52,8 +52,8 @@ BOOST_AUTO_TEST_CASE(unregister_validation_interface_race)
 class TestInterface : public CValidationInterface
 {
 public:
-    TestInterface(std::function<void()> on_call = nullptr, std::function<void()> on_destroy = nullptr)
-        : m_on_call(std::move(on_call)), m_on_destroy(std::move(on_destroy))
+    TestInterface(CMainSignals& signals, std::function<void()> on_call = nullptr, std::function<void()> on_destroy = nullptr)
+        : m_on_call(std::move(on_call)), m_on_destroy(std::move(on_destroy)), m_signals{signals}
     {
     }
     virtual ~TestInterface()
@@ -64,14 +64,15 @@ public:
     {
         if (m_on_call) m_on_call();
     }
-    static void Call()
+    void Call()
     {
         CBlock block;
         BlockValidationState state;
-        GetMainSignals().BlockChecked(block, state);
+        m_signals.BlockChecked(block, state);
     }
     std::function<void()> m_on_call;
     std::function<void()> m_on_destroy;
+    CMainSignals& m_signals;
 };
 
 // Regression test to ensure UnregisterAllValidationInterfaces calls don't
@@ -80,17 +81,23 @@ public:
 BOOST_AUTO_TEST_CASE(unregister_all_during_call)
 {
     bool destroyed = false;
-    RegisterSharedValidationInterface(std::make_shared<TestInterface>(
+    auto shared{std::make_shared<TestInterface>(
+        *m_node.validation_signals,
         [&] {
             // First call should decrements reference count 2 -> 1
-            UnregisterAllValidationInterfaces();
+            m_node.validation_signals->UnregisterAllValidationInterfaces();
             BOOST_CHECK(!destroyed);
             // Second call should not decrement reference count 1 -> 0
-            UnregisterAllValidationInterfaces();
+            m_node.validation_signals->UnregisterAllValidationInterfaces();
             BOOST_CHECK(!destroyed);
         },
-        [&] { destroyed = true; }));
-    TestInterface::Call();
+        [&] { destroyed = true; })};
+    m_node.validation_signals->RegisterSharedValidationInterface(shared);
+    BOOST_CHECK(shared.use_count() == 2);
+    shared->Call();
+    BOOST_CHECK(shared.use_count() == 1);
+    BOOST_CHECK(!destroyed);
+    shared.reset();
     BOOST_CHECK(destroyed);
 }
 
diff --git a/src/validation.cpp b/src/validation.cpp
index b3a53a537d..7490ad012f 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3217,7 +3217,7 @@ static void LimitValidationInterfaceQueue(CMainSignals& signals) LOCKS_EXCLUDED(
     AssertLockNotHeld(cs_main);
 
     if (signals.CallbacksPending() > 10) {
-        SyncWithValidationInterfaceQueue();
+        signals.SyncWithValidationInterfaceQueue();
     }
 }
 
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index 91ab34d365..d1d562ff32 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -94,8 +94,6 @@ public:
     }
 };
 
-static CMainSignals g_signals;
-
 CMainSignals::CMainSignals() {}
 
 CMainSignals::~CMainSignals() {}
@@ -124,11 +122,6 @@ size_t CMainSignals::CallbacksPending()
     return m_internals->m_schedulerClient.CallbacksPending();
 }
 
-CMainSignals& GetMainSignals()
-{
-    return g_signals;
-}
-
 void CMainSignals::RegisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks)
 {
     // Each connection captures the shared_ptr to ensure that each callback is
@@ -277,33 +270,3 @@ void CMainSignals::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared
     LOG_EVENT("%s: block hash=%s", __func__, block->GetHash().ToString());
     m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.NewPoWValidBlock(pindex, block); });
 }
-
-// These functions are temporary and will be removed in the following commit
-void RegisterValidationInterface(CValidationInterface* callbacks)
-{
-    GetMainSignals().RegisterValidationInterface(callbacks);
-}
-void UnregisterValidationInterface(CValidationInterface* callbacks)
-{
-    GetMainSignals().UnregisterValidationInterface(callbacks);
-}
-void UnregisterAllValidationInterfaces()
-{
-    GetMainSignals().UnregisterAllValidationInterfaces();
-}
-void RegisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks)
-{
-    GetMainSignals().RegisterSharedValidationInterface(callbacks);
-}
-void UnregisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks)
-{
-    GetMainSignals().UnregisterSharedValidationInterface(callbacks);
-}
-void CallFunctionInValidationInterfaceQueue(std::function<void ()> func)
-{
-    GetMainSignals().CallFunctionInValidationInterfaceQueue(func);
-}
-void SyncWithValidationInterfaceQueue()
-{
-    GetMainSignals().SyncWithValidationInterfaceQueue();
-}
diff --git a/src/validationinterface.h b/src/validationinterface.h
index 0cd494233a..57e2716c11 100644
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -21,22 +21,11 @@ class BlockValidationState;
 class CBlock;
 class CBlockIndex;
 struct CBlockLocator;
-class CValidationInterface;
 class CScheduler;
 enum class MemPoolRemovalReason;
 struct RemovedMempoolTransactionInfo;
 struct NewMempoolTransactionInfo;
 
-void RegisterValidationInterface(CValidationInterface* callbacks);
-void UnregisterValidationInterface(CValidationInterface* callbacks);
-void UnregisterAllValidationInterfaces();
-
-void RegisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks);
-void UnregisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks);
-
-void CallFunctionInValidationInterfaceQueue(std::function<void ()> func);
-void SyncWithValidationInterfaceQueue() LOCKS_EXCLUDED(cs_main);
-
 /**
  * Implement this to subscribe to events generated in validation and mempool
  *
@@ -232,6 +221,4 @@ public:
     void NewPoWValidBlock(const CBlockIndex *, const std::shared_ptr<const CBlock>&);
 };
 
-CMainSignals& GetMainSignals();
-
 #endif // BITCOIN_VALIDATIONINTERFACE_H
diff --git a/src/wallet/test/util.cpp b/src/wallet/test/util.cpp
index cbf3ccd1ec..49d206f409 100644
--- a/src/wallet/test/util.cpp
+++ b/src/wallet/test/util.cpp
@@ -71,7 +71,8 @@ std::shared_ptr<CWallet> TestLoadWallet(WalletContext& context)
 
 void TestUnloadWallet(std::shared_ptr<CWallet>&& wallet)
 {
-    SyncWithValidationInterfaceQueue();
+    // Calls SyncWithValidationInterfaceQueue
+    wallet->chain().waitForNotificationsIfTipChanged({});
     wallet->m_chain_notifications_handler.reset();
     UnloadWallet(std::move(wallet));
 }
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 65297054df..3f6629d55c 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -812,7 +812,7 @@ BOOST_FIXTURE_TEST_CASE(CreateWallet, TestChain100Setup)
     // transactionAddedToMempool notifications, and create block and mempool
     // transactions paying to the wallet
     std::promise<void> promise;
-    CallFunctionInValidationInterfaceQueue([&promise] {
+    m_node.validation_signals->CallFunctionInValidationInterfaceQueue([&promise] {
         promise.get_future().wait();
     });
     std::string error;
@@ -840,7 +840,7 @@ BOOST_FIXTURE_TEST_CASE(CreateWallet, TestChain100Setup)
     // Unblock notification queue and make sure stale blockConnected and
     // transactionAddedToMempool events are processed
     promise.set_value();
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
     // AddToWallet events for block_tx and mempool_tx events are counted a
     // second time as the notification queue is processed
     BOOST_CHECK_EQUAL(addtx_count, 5);
@@ -863,7 +863,7 @@ BOOST_FIXTURE_TEST_CASE(CreateWallet, TestChain100Setup)
             m_coinbase_txns.push_back(CreateAndProcessBlock({block_tx}, GetScriptForRawPubKey(coinbaseKey.GetPubKey())).vtx[0]);
             mempool_tx = TestSimpleSpend(*m_coinbase_txns[3], 0, coinbaseKey, GetScriptForRawPubKey(key.GetPubKey()));
             BOOST_CHECK(m_node.chain->broadcastTransaction(MakeTransactionRef(mempool_tx), DEFAULT_TRANSACTION_MAXFEE, false, error));
-            SyncWithValidationInterfaceQueue();
+            m_node.validation_signals->SyncWithValidationInterfaceQueue();
         });
     wallet = TestLoadWallet(context);
     // Since mempool transactions are requested at the end of loading, there will
@@ -903,7 +903,7 @@ BOOST_FIXTURE_TEST_CASE(ZapSelectTx, TestChain100Setup)
     auto block_tx = TestSimpleSpend(*m_coinbase_txns[0], 0, coinbaseKey, GetScriptForRawPubKey(key.GetPubKey()));
     CreateAndProcessBlock({block_tx}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
 
-    SyncWithValidationInterfaceQueue();
+    m_node.validation_signals->SyncWithValidationInterfaceQueue();
 
     {
         auto block_hash = block_tx.GetHash();