refactor: Delete ChainstateManager::GetAll() method

diff --git a/src/init.cpp b/src/init.cpp
index 9c710d69..80055292 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -345,7 +345,7 @@ void Shutdown(NodeContext& node)
     // FlushStateToDisk generates a ChainStateFlushed callback, which we should avoid missing
     if (node.chainman) {
         LOCK(cs_main);
-        for (Chainstate* chainstate : node.chainman->GetAll()) {
+        for (const auto& chainstate : node.chainman->m_chainstates) {
             if (chainstate->CanFlushToDisk()) {
                 chainstate->ForceFlushStateToDisk();
             }
@@ -371,7 +371,7 @@ void Shutdown(NodeContext& node)
 
     if (node.chainman) {
         LOCK(cs_main);
-        for (Chainstate* chainstate : node.chainman->GetAll()) {
+        for (const auto& chainstate : node.chainman->m_chainstates) {
             if (chainstate->CanFlushToDisk()) {
                 chainstate->ForceFlushStateToDisk();
                 chainstate->ResetCoinsViews();
@@ -1873,7 +1873,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     if (chainman.m_blockman.IsPruneMode()) {
         if (chainman.m_blockman.m_blockfiles_indexed) {
             LOCK(cs_main);
-            for (Chainstate* chainstate : chainman.GetAll()) {
+            for (const auto& chainstate : chainman.m_chainstates) {
                 uiInterface.InitMessage(_("Pruning blockstore…"));
                 chainstate->PruneAndFlush();
             }
diff --git a/src/kernel/bitcoinkernel.cpp b/src/kernel/bitcoinkernel.cpp
index 5bb1a06b..15812baf 100644
--- a/src/kernel/bitcoinkernel.cpp
+++ b/src/kernel/bitcoinkernel.cpp
@@ -1009,7 +1009,7 @@ void btck_chainstate_manager_destroy(btck_ChainstateManager* chainman)
 {
     {
         LOCK(btck_ChainstateManager::get(chainman).m_chainman->GetMutex());
-        for (Chainstate* chainstate : btck_ChainstateManager::get(chainman).m_chainman->GetAll()) {
+        for (const auto& chainstate : btck_ChainstateManager::get(chainman).m_chainman->m_chainstates) {
             if (chainstate->CanFlushToDisk()) {
                 chainstate->ForceFlushStateToDisk();
                 chainstate->ResetCoinsViews();
diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
index 0bb22d90..ec95f11b 100644
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -318,9 +318,16 @@ void BlockManager::FindFilesToPrune(
     ChainstateManager& chainman)
 {
     LOCK2(cs_main, cs_LastBlockFile);
-    // Distribute our -prune budget over all chainstates.
+    // Compute `target` value with maximum size (in bytes) of blocks below the
+    // `last_prune` height which should be preserved and not pruned. The
+    // `target` value will be derived from the -prune preference provided by the
+    // user. If there is a historical chainstate being used to populate indexes
+    // and validate the snapshot, the target is divided by two so half of the
+    // block storage will be reserved for the historical chainstate, and the
+    // other half will be reserved for the most-work chainstate.
+    const int num_chainstates{chainman.HistoricalChainstate() ? 2 : 1};
     const auto target = std::max(
-        MIN_DISK_SPACE_FOR_BLOCK_FILES, GetPruneTarget() / chainman.GetAll().size());
+        MIN_DISK_SPACE_FOR_BLOCK_FILES, GetPruneTarget() / num_chainstates);
     const uint64_t target_sync_height = chainman.m_best_header->nHeight;
 
     if (chain.m_chain.Height() < 0 || target == 0) {
diff --git a/src/node/chainstate.cpp b/src/node/chainstate.cpp
index 59d6de63..4a8f8240 100644
--- a/src/node/chainstate.cpp
+++ b/src/node/chainstate.cpp
@@ -66,8 +66,8 @@ static ChainstateLoadResult CompleteChainstateInitialization(
         return {ChainstateLoadStatus::FAILURE, _("Error initializing block database")};
     }
 
-    auto is_coinsview_empty = [&](Chainstate* chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
-        return options.wipe_chainstate_db || chainstate->CoinsTip().GetBestBlock().IsNull();
+    auto is_coinsview_empty = [&](Chainstate& chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
+        return options.wipe_chainstate_db || chainstate.CoinsTip().GetBestBlock().IsNull();
     };
 
     assert(chainman.m_total_coinstip_cache > 0);
@@ -78,12 +78,12 @@ static ChainstateLoadResult CompleteChainstateInitialization(
     // recalculated by `chainman.MaybeRebalanceCaches()`. The discount factor
     // is conservatively chosen such that the sum of the caches does not exceed
     // the allowable amount during this temporary initialization state.
-    double init_cache_fraction = chainman.GetAll().size() > 1 ? 0.2 : 1.0;
+    double init_cache_fraction = chainman.HistoricalChainstate() ? 0.2 : 1.0;
 
     // At this point we're either in reindex or we've loaded a useful
     // block tree into BlockIndex()!
 
-    for (Chainstate* chainstate : chainman.GetAll()) {
+    for (const auto& chainstate : chainman.m_chainstates) {
         LogInfo("Initializing chainstate %s", chainstate->ToString());
 
         try {
@@ -117,7 +117,7 @@ static ChainstateLoadResult CompleteChainstateInitialization(
         chainstate->InitCoinsCache(chainman.m_total_coinstip_cache * init_cache_fraction);
         assert(chainstate->CanFlushToDisk());
 
-        if (!is_coinsview_empty(chainstate)) {
+        if (!is_coinsview_empty(*chainstate)) {
             // LoadChainTip initializes the chain based on CoinsTip()'s best block
             if (!chainstate->LoadChainTip()) {
                 return {ChainstateLoadStatus::FAILURE, _("Error initializing block database")};
@@ -126,9 +126,9 @@ static ChainstateLoadResult CompleteChainstateInitialization(
         }
     }
 
-    auto chainstates{chainman.GetAll()};
+    const auto& chainstates{chainman.m_chainstates};
     if (std::any_of(chainstates.begin(), chainstates.end(),
-                    [](const Chainstate* cs) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return cs->NeedsRedownload(); })) {
+                    [](const auto& cs) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return cs->NeedsRedownload(); })) {
         return {ChainstateLoadStatus::FAILURE, strprintf(_("Witness data for blocks after height %d requires validation. Please restart with -reindex."),
                                                          chainman.GetConsensus().SegwitHeight)};
     };
@@ -209,7 +209,7 @@ ChainstateLoadResult LoadChainstate(ChainstateManager& chainman, const CacheSize
         // Because ValidatedSnapshotCleanup() has torn down chainstates with
         // ChainstateManager::ResetChainstates(), reinitialize them here without
         // duplicating the blockindex work above.
-        assert(chainman.GetAll().empty());
+        assert(chainman.m_chainstates.empty());
 
         chainman.InitializeChainstate(options.mempool);
 
@@ -232,14 +232,14 @@ ChainstateLoadResult LoadChainstate(ChainstateManager& chainman, const CacheSize
 
 ChainstateLoadResult VerifyLoadedChainstate(ChainstateManager& chainman, const ChainstateLoadOptions& options)
 {
-    auto is_coinsview_empty = [&](Chainstate* chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
-        return options.wipe_chainstate_db || chainstate->CoinsTip().GetBestBlock().IsNull();
+    auto is_coinsview_empty = [&](Chainstate& chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
+        return options.wipe_chainstate_db || chainstate.CoinsTip().GetBestBlock().IsNull();
     };
 
     LOCK(cs_main);
 
-    for (Chainstate* chainstate : chainman.GetAll()) {
-        if (!is_coinsview_empty(chainstate)) {
+    for (auto& chainstate : chainman.m_chainstates) {
+        if (!is_coinsview_empty(*chainstate)) {
             const CBlockIndex* tip = chainstate->m_chain.Tip();
             if (tip && tip->nTime > GetTime() + MAX_FUTURE_BLOCK_TIME) {
                 return {ChainstateLoadStatus::FAILURE, _("The block database contains a block which appears to be from the future. "
diff --git a/src/test/util/validation.cpp b/src/test/util/validation.cpp
index ae8642f9..c199d912 100644
--- a/src/test/util/validation.cpp
+++ b/src/test/util/validation.cpp
@@ -16,8 +16,9 @@ void TestChainstateManager::DisableNextWrite()
     struct TestChainstate : public Chainstate {
         void ResetNextWrite() { m_next_write = NodeClock::time_point::max() - 1s; }
     };
-    for (auto* cs : GetAll()) {
-        static_cast<TestChainstate*>(cs)->ResetNextWrite();
+    LOCK(::cs_main);
+    for (const auto& cs : m_chainstates) {
+        static_cast<TestChainstate&>(*cs).ResetNextWrite();
     }
 }
 
diff --git a/src/test/validation_chainstatemanager_tests.cpp b/src/test/validation_chainstatemanager_tests.cpp
index 5a1ff8cd..539ae453 100644
--- a/src/test/validation_chainstatemanager_tests.cpp
+++ b/src/test/validation_chainstatemanager_tests.cpp
@@ -40,18 +40,19 @@ BOOST_FIXTURE_TEST_SUITE(validation_chainstatemanager_tests, TestingSetup)
 BOOST_FIXTURE_TEST_CASE(chainstatemanager, TestChain100Setup)
 {
     ChainstateManager& manager = *m_node.chainman;
-    std::vector<Chainstate*> chainstates;
 
     BOOST_CHECK(WITH_LOCK(::cs_main, return !manager.CurrentChainstate().m_from_snapshot_blockhash));
 
     // Create a legacy (IBD) chainstate.
     //
     Chainstate& c1 = manager.ActiveChainstate();
-    chainstates.push_back(&c1);
 
     BOOST_CHECK(WITH_LOCK(::cs_main, return !manager.CurrentChainstate().m_from_snapshot_blockhash));
-    auto all = manager.GetAll();
-    BOOST_CHECK_EQUAL_COLLECTIONS(all.begin(), all.end(), chainstates.begin(), chainstates.end());
+    {
+        LOCK(manager.GetMutex());
+        BOOST_CHECK_EQUAL(manager.m_chainstates.size(), 1);
+        BOOST_CHECK_EQUAL(manager.m_chainstates[0].get(), &c1);
+    }
 
     auto& active_chain = WITH_LOCK(manager.GetMutex(), return manager.ActiveChain());
     BOOST_CHECK_EQUAL(&active_chain, &c1.m_chain);
@@ -69,7 +70,6 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager, TestChain100Setup)
     //
     const uint256 snapshot_blockhash = active_tip->GetBlockHash();
     Chainstate& c2{WITH_LOCK(::cs_main, return manager.AddChainstate(std::make_unique<Chainstate>(nullptr, manager.m_blockman, manager, snapshot_blockhash)))};
-    chainstates.push_back(&c2);
     c2.InitCoinsDB(
         /*cache_size_bytes=*/1 << 23, /*in_memory=*/true, /*should_wipe=*/false);
     {
@@ -86,8 +86,12 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager, TestChain100Setup)
     BOOST_CHECK(WITH_LOCK(::cs_main, return manager.CurrentChainstate().m_assumeutxo == Assumeutxo::UNVALIDATED));
     BOOST_CHECK_EQUAL(&c2, &manager.ActiveChainstate());
     BOOST_CHECK(&c1 != &manager.ActiveChainstate());
-    auto all2 = manager.GetAll();
-    BOOST_CHECK_EQUAL_COLLECTIONS(all2.begin(), all2.end(), chainstates.begin(), chainstates.end());
+    {
+        LOCK(manager.GetMutex());
+        BOOST_CHECK_EQUAL(manager.m_chainstates.size(), 2);
+        BOOST_CHECK_EQUAL(manager.m_chainstates[0].get(), &c1);
+        BOOST_CHECK_EQUAL(manager.m_chainstates[1].get(), &c2);
+    }
 
     auto& active_chain2 = WITH_LOCK(manager.GetMutex(), return manager.ActiveChain());
     BOOST_CHECK_EQUAL(&active_chain2, &c2.m_chain);
@@ -292,7 +296,7 @@ struct SnapshotTestSetup : TestChain100Setup {
             LOCK(::cs_main);
             int chains_tested{0};
 
-            for (Chainstate* chainstate : chainman.GetAll()) {
+            for (const auto& chainstate : chainman.m_chainstates) {
                 BOOST_TEST_MESSAGE("Checking coins in " << chainstate->ToString());
                 CCoinsViewCache& coinscache = chainstate->CoinsTip();
 
@@ -325,10 +329,10 @@ struct SnapshotTestSetup : TestChain100Setup {
             size_t coins_in_background{0};
             size_t coins_missing_from_background{0};
 
-            for (Chainstate* chainstate : chainman.GetAll()) {
+            for (const auto& chainstate : chainman.m_chainstates) {
                 BOOST_TEST_MESSAGE("Checking coins in " << chainstate->ToString());
                 CCoinsViewCache& coinscache = chainstate->CoinsTip();
-                bool is_background = chainstate != &chainman.ActiveChainstate();
+                bool is_background = chainstate.get() != &chainman.ActiveChainstate();
 
                 for (CTransactionRef& txn : m_coinbase_txns) {
                     COutPoint op{txn->GetHash(), 0};
@@ -365,15 +369,17 @@ struct SnapshotTestSetup : TestChain100Setup {
 
         BOOST_TEST_MESSAGE("Simulating node restart");
         {
-            for (Chainstate* cs : chainman.GetAll()) {
-                LOCK(::cs_main);
-                cs->ForceFlushStateToDisk();
+            LOCK(chainman.GetMutex());
+            for (const auto& cs : chainman.m_chainstates) {
+                if (cs->CanFlushToDisk()) cs->ForceFlushStateToDisk();
             }
+        }
+        {
             // Process all callbacks referring to the old manager before wiping it.
             m_node.validation_signals->SyncWithValidationInterfaceQueue();
             LOCK(::cs_main);
             chainman.ResetChainstates();
-            BOOST_CHECK_EQUAL(chainman.GetAll().size(), 0);
+            BOOST_CHECK_EQUAL(chainman.m_chainstates.size(), 0);
             m_node.notifications = std::make_unique<KernelNotifications>(Assert(m_node.shutdown_request), m_node.exit_status, *Assert(m_node.warnings));
             const ChainstateManager::Options chainman_opts{
                 .chainparams = ::Params(),
@@ -438,17 +444,16 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_loadblockindex, TestChain100Setup)
     BOOST_CHECK_EQUAL(assumed_tip->nHeight, 120);
 
     auto reload_all_block_indexes = [&]() {
+        LOCK(chainman.GetMutex());
         // For completeness, we also reset the block sequence counters to
         // ensure that no state which affects the ranking of tip-candidates is
         // retained (even though this isn't strictly necessary).
-        WITH_LOCK(::cs_main, return chainman.ResetBlockSequenceCounters());
-        for (Chainstate* cs : chainman.GetAll()) {
-            LOCK(::cs_main);
+        chainman.ResetBlockSequenceCounters();
+        for (const auto& cs : chainman.m_chainstates) {
             cs->ClearBlockIndexCandidates();
             BOOST_CHECK(cs->setBlockIndexCandidates.empty());
         }
-
-        WITH_LOCK(::cs_main, chainman.LoadBlockIndex());
+        chainman.LoadBlockIndex();
     };
 
     // Ensure that without any assumed-valid BlockIndex entries, only the current tip is
@@ -565,8 +570,7 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_init, SnapshotTestSetup)
     const uint256 snapshot_tip_hash = WITH_LOCK(chainman.GetMutex(),
         return chainman.ActiveTip()->GetBlockHash());
 
-    auto all_chainstates = chainman.GetAll();
-    BOOST_CHECK_EQUAL(all_chainstates.size(), 2);
+    BOOST_CHECK_EQUAL(WITH_LOCK(chainman.GetMutex(), return chainman.m_chainstates.size()), 2);
 
     // "Rewind" the background chainstate so that its tip is not at the
     // base block of the snapshot - this is so after simulating a node restart,
@@ -591,23 +595,22 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_init, SnapshotTestSetup)
     // This call reinitializes the chainstates.
     this->LoadVerifyActivateChainstate();
 
-    std::vector<Chainstate*> chainstates;
     {
         LOCK(chainman_restarted.GetMutex());
-        chainstates = chainman_restarted.GetAll();
-        BOOST_CHECK_EQUAL(chainstates.size(), 2);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates.size(), 2);
         // Background chainstate has height of 109 not 110 here due to a quirk
         // of the LoadVerifyActivate only calling ActivateBestChain on one
         // chainstate. The height would be 110 after a real restart, but it's
         // fine for this test which is focused on the snapshot chainstate.
-        BOOST_CHECK_EQUAL(chainstates[0]->m_chain.Height(), 109);
-        BOOST_CHECK_EQUAL(chainstates[1]->m_chain.Height(), 210);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates[0]->m_chain.Height(), 109);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates[1]->m_chain.Height(), 210);
 
         BOOST_CHECK(chainman_restarted.CurrentChainstate().m_from_snapshot_blockhash);
         BOOST_CHECK(chainman_restarted.CurrentChainstate().m_assumeutxo == Assumeutxo::UNVALIDATED);
 
         BOOST_CHECK_EQUAL(chainman_restarted.ActiveTip()->GetBlockHash(), snapshot_tip_hash);
         BOOST_CHECK_EQUAL(chainman_restarted.ActiveHeight(), 210);
+        BOOST_CHECK_EQUAL(chainman_restarted.HistoricalChainstate()->m_chain.Height(), 109);
     }
 
     BOOST_TEST_MESSAGE(
@@ -619,9 +622,10 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_init, SnapshotTestSetup)
 
         // Background chainstate should be unaware of new blocks on the snapshot
         // chainstate, but the block disconnected above is now reattached.
-        BOOST_CHECK_EQUAL(chainstates[0]->m_chain.Height(), 110);
-        BOOST_CHECK_EQUAL(chainstates[1]->m_chain.Height(), 220);
-        BOOST_CHECK_EQUAL(chainman_restarted.GetAll().size(), 1);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates.size(), 2);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates[0]->m_chain.Height(), 110);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates[1]->m_chain.Height(), 220);
+        BOOST_CHECK_EQUAL(chainman_restarted.HistoricalChainstate(), nullptr);
     }
 }
 
@@ -651,16 +655,13 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_completion, SnapshotTestSetup
 
     BOOST_CHECK(WITH_LOCK(::cs_main, return chainman.CurrentChainstate().m_assumeutxo == Assumeutxo::VALIDATED));
     BOOST_CHECK(WITH_LOCK(::cs_main, return chainman.CurrentChainstate().m_from_snapshot_blockhash));
+    BOOST_CHECK_EQUAL(WITH_LOCK(chainman.GetMutex(), return chainman.HistoricalChainstate()), nullptr);
 
     // Cache should have been rebalanced and reallocated to the "only" remaining
     // chainstate.
     BOOST_CHECK(active_cs.m_coinstip_cache_size_bytes > tip_cache_before_complete);
     BOOST_CHECK(active_cs.m_coinsdb_cache_size_bytes > db_cache_before_complete);
 
-    auto all_chainstates = chainman.GetAll();
-    BOOST_CHECK_EQUAL(all_chainstates.size(), 1);
-    BOOST_CHECK_EQUAL(all_chainstates[0], &active_cs);
-
     // Trying completion again should return false.
     res = WITH_LOCK(::cs_main, return chainman.MaybeValidateSnapshot(validated_cs, active_cs));
     BOOST_CHECK_EQUAL(res, SnapshotCompletionResult::SKIPPED);
@@ -690,7 +691,7 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_completion, SnapshotTestSetup
 
     {
         LOCK(chainman_restarted.GetMutex());
-        BOOST_CHECK_EQUAL(chainman_restarted.GetAll().size(), 1);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates.size(), 1);
         BOOST_CHECK(!chainman_restarted.CurrentChainstate().m_from_snapshot_blockhash);
         BOOST_CHECK(active_cs2.m_coinstip_cache_size_bytes > tip_cache_before_complete);
         BOOST_CHECK(active_cs2.m_coinsdb_cache_size_bytes > db_cache_before_complete);
@@ -737,10 +738,14 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_completion_hash_mismatch, Sna
         BOOST_CHECK_EQUAL(res, SnapshotCompletionResult::HASH_MISMATCH);
     }
 
-    auto all_chainstates = chainman.GetAll();
-    BOOST_CHECK_EQUAL(all_chainstates.size(), 1);
-    BOOST_CHECK_EQUAL(all_chainstates[0], &validation_chainstate);
-    BOOST_CHECK_EQUAL(&chainman.ActiveChainstate(), &validation_chainstate);
+    {
+        LOCK(chainman.GetMutex());
+        BOOST_CHECK_EQUAL(chainman.m_chainstates.size(), 2);
+        BOOST_CHECK(chainman.m_chainstates[0]->m_assumeutxo == Assumeutxo::VALIDATED);
+        BOOST_CHECK(!chainman.m_chainstates[0]->SnapshotBase());
+        BOOST_CHECK(chainman.m_chainstates[1]->m_assumeutxo == Assumeutxo::INVALID);
+        BOOST_CHECK(chainman.m_chainstates[1]->SnapshotBase());
+    }
 
     fs::path snapshot_invalid_dir = gArgs.GetDataDirNet() / "chainstate_snapshot_INVALID";
     BOOST_CHECK(fs::exists(snapshot_invalid_dir));
@@ -761,7 +766,7 @@ BOOST_FIXTURE_TEST_CASE(chainstatemanager_snapshot_completion_hash_mismatch, Sna
 
     {
         LOCK(::cs_main);
-        BOOST_CHECK_EQUAL(chainman_restarted.GetAll().size(), 1);
+        BOOST_CHECK_EQUAL(chainman_restarted.m_chainstates.size(), 1);
         BOOST_CHECK(!chainman_restarted.CurrentChainstate().m_from_snapshot_blockhash);
         BOOST_CHECK_EQUAL(chainman_restarted.ActiveHeight(), 210);
     }
diff --git a/src/validation.cpp b/src/validation.cpp
index cc080d01..72872c5c 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3811,6 +3811,15 @@ void Chainstate::ResetBlockFailureFlags(CBlockIndex *pindex) {
 void Chainstate::TryAddBlockIndexCandidate(CBlockIndex* pindex)
 {
     AssertLockHeld(cs_main);
+
+    // Do not continue building a chainstate that is based on an invalid
+    // snapshot. This is a belt-and-suspenders type of check because if an
+    // invalid snapshot is loaded, the node will shut down to force a manual
+    // intervention. But it is good to handle this case correctly regardless.
+    if (m_assumeutxo == Assumeutxo::INVALID) {
+        return;
+    }
+
     // The block only is a candidate for the most-work-chain if it has the same
     // or more work than our current tip.
     if (m_chain.Tip() != nullptr && setBlockIndexCandidates.value_comp()(pindex, m_chain.Tip())) {
@@ -3877,7 +3886,7 @@ void ChainstateManager::ReceivedBlockTransactions(const CBlock& block, CBlockInd
             }
             pindex->m_chain_tx_count = prev_tx_sum(*pindex);
             pindex->nSequenceId = nBlockSequenceId++;
-            for (Chainstate *c : GetAll()) {
+            for (const auto& c : m_chainstates) {
                 c->TryAddBlockIndexCandidate(pindex);
             }
             std::pair<std::multimap<CBlockIndex*, CBlockIndex*>::iterator, std::multimap<CBlockIndex*, CBlockIndex*>::iterator> range = m_blockman.m_blocks_unlinked.equal_range(pindex);
@@ -4980,7 +4989,7 @@ bool ChainstateManager::LoadBlockIndex()
                     (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) &&
                      (pindex->HaveNumChainTxs() || pindex->pprev == nullptr))) {
 
-                for (Chainstate* chainstate : GetAll()) {
+                for (const auto& chainstate : m_chainstates) {
                     chainstate->TryAddBlockIndexCandidate(pindex);
                 }
             }
@@ -5595,18 +5604,6 @@ double ChainstateManager::GuessVerificationProgress(const CBlockIndex* pindex) c
     return std::min<double>(pindex->m_chain_tx_count / fTxTotal, 1.0);
 }
 
-std::vector<Chainstate*> ChainstateManager::GetAll()
-{
-    LOCK(::cs_main);
-    std::vector<Chainstate*> out;
-
-    for (const auto& cs : m_chainstates) {
-        if (cs && cs->m_assumeutxo != Assumeutxo::INVALID && !cs->m_target_utxohash) out.push_back(cs.get());
-    }
-
-    return out;
-}
-
 Chainstate& ChainstateManager::InitializeChainstate(CTxMemPool* mempool)
 {
     AssertLockHeld(::cs_main);
@@ -6354,9 +6351,7 @@ bool ChainstateManager::ValidatedSnapshotCleanup(Chainstate& validated_cs, Chain
     // The caller of this method will be responsible for reinitializing chainstates
     // if they want to continue operation.
     this->ResetChainstates();
-
-    // No chainstates should be considered usable.
-    assert(this->GetAll().size() == 0);
+    assert(this->m_chainstates.size() == 0);
 
     LogInfo("[snapshot] deleting background chainstate directory (now unnecessary) (%s)",
               fs::PathToString(validated_path));
@@ -6445,7 +6440,17 @@ util::Result<void> ChainstateManager::ActivateBestChains()
     // the chainman unique_ptrs since ABC requires us not to be holding cs_main, so retrieve
     // the relevant pointers before the ABC call.
     AssertLockNotHeld(cs_main);
-    for (Chainstate* chainstate : GetAll()) {
+    std::vector<Chainstate*> chainstates;
+    {
+        LOCK(GetMutex());
+        chainstates.reserve(m_chainstates.size());
+        for (const auto& chainstate : m_chainstates) {
+            if (chainstate && chainstate->m_assumeutxo != Assumeutxo::INVALID && !chainstate->m_target_utxohash) {
+                chainstates.push_back(chainstate.get());
+            }
+        }
+    }
+    for (Chainstate* chainstate : chainstates) {
         BlockValidationState state;
         if (!chainstate->ActivateBestChain(state, nullptr)) {
             LOCK(GetMutex());
diff --git a/src/validation.h b/src/validation.h
index 82fbf04d..e14dac74 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -1081,9 +1081,6 @@ public:
     //                                  constructor
     Chainstate& InitializeChainstate(CTxMemPool* mempool) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 
-    //! Get all chainstates currently being used.
-    std::vector<Chainstate*> GetAll();
-
     //! Construct and activate a Chainstate on the basis of UTXO snapshot data.
     //!
     //! Steps: