Merge #15288: Remove wallet -> node global function calls

f7efd87c8f Change brace formatting (Russell Yanofsky)
a1df1b48a8 Remove use of IsInitialBlockDownload in wallet code (Russell Yanofsky)
1106a6fde4 Remove use of uiInterface.LoadWallet in wallet code (Russell Yanofsky)
318f41fb2c circular-dependencies: Avoid treating some .h/.cpp files as a unit (Russell Yanofsky)
d02b34c8a8 Remove use of AcceptToMemoryPool in wallet code (Russell Yanofsky)
e2c8ba9f6e Remove uses of InitMessage/Warning/Error in wallet code (Russell Yanofsky)
c5e59a96a8 Remove uses of GetAdjustedTime in wallet code (Russell Yanofsky)
6d6bcc77c0 Remove use of g_connman / PushInventory in wallet code (Russell Yanofsky)
00dfb2a440 Remove uses of g_connman in wallet code (Russell Yanofsky)
cc3836e8f9 Remove uses of fPruneMode in wallet code (Russell Yanofsky)
cc02c796d3 Remove uses of fee globals in wallet code (Russell Yanofsky)
1fb0a4a04e Remove use of CalculateMemPoolAncestors in wallet code (Russell Yanofsky)
cd32160af0 Remove use of GetTransactionAncestry in wallet code (Russell Yanofsky)
291276f7f4 Remove use of GetCountWithDescendants in wallet code (Russell Yanofsky)
bdc6628683 Remove use of IsRBFOptIn in wallet code (Russell Yanofsky)
80f52a2267 Remove uses of CheckFinalTx in wallet code (Russell Yanofsky)

Pull request description:

  This change removes wallet calls to node functions that access global chain and mempool state.

  This is the next step in the larger #10973 refactoring change, which removes all other accesses to node global variables from wallet code. Doing this is useful to provide a better defined interface between the wallet and node, and necessary to allow wallet and node code to run in separate processes in #10102.

Tree-SHA512: 40dbaf1f59fb22b32e70b054b30ba5638d638aa3240fa30e0f721d53c721cd6138a7ab4d423a24d7d2fda0b956e68d44c733abc2c9259c3d6c9fd6d4be89aa23

20 files changed, 289 insertions, 156 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 2e297d3dac..14db963253 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -568,12 +568,14 @@ bitcoin_wallet_LDADD = \
   $(LIBBITCOIN_CONSENSUS) \
   $(LIBBITCOIN_UTIL) \
   $(LIBBITCOIN_CRYPTO) \
+  $(LIBBITCOIN_ZMQ) \
   $(LIBLEVELDB) \
   $(LIBLEVELDB_SSE42) \
   $(LIBMEMENV) \
-  $(LIBSECP256K1)
+  $(LIBSECP256K1) \
+  $(LIBUNIVALUE)
 
-bitcoin_wallet_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS)
+bitcoin_wallet_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(CRYPTO_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(MINIUPNPC_LIBS) $(ZMQ_LIBS)
 #
 
 # bitcoinconsensus library #
diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index 5e787ca222..77fb416b9c 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -57,7 +57,7 @@ if ENABLE_WALLET
 bench_bench_bitcoin_SOURCES += bench/coin_selection.cpp
 endif
 
-bench_bench_bitcoin_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS)
+bench_bench_bitcoin_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(CRYPTO_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(MINIUPNPC_LIBS)
 bench_bench_bitcoin_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 CLEAN_BITCOIN_BENCH = bench/*.gcda bench/*.gcno $(GENERATED_BENCH_FILES)
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index da810bc5e6..fb634e73da 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -6,8 +6,19 @@
 
 #include <chain.h>
 #include <chainparams.h>
+#include <interfaces/wallet.h>
+#include <net.h>
+#include <policy/fees.h>
+#include <policy/policy.h>
+#include <policy/rbf.h>
 #include <primitives/block.h>
+#include <primitives/transaction.h>
+#include <protocol.h>
 #include <sync.h>
+#include <threadsafety.h>
+#include <timedata.h>
+#include <txmempool.h>
+#include <ui_interface.h>
 #include <uint256.h>
 #include <util/system.h>
 #include <validation.h>
@@ -132,6 +143,17 @@ class LockImpl : public Chain::Lock
         }
         return nullopt;
     }
+    bool checkFinalTx(const CTransaction& tx) override
+    {
+        LockAnnotation lock(::cs_main);
+        return CheckFinalTx(tx);
+    }
+    bool submitToMemoryPool(CTransactionRef tx, CAmount absurd_fee, CValidationState& state) override
+    {
+        LockAnnotation lock(::cs_main);
+        return AcceptToMemoryPool(::mempool, state, tx, nullptr /* missing inputs */, nullptr /* txn replaced */,
+            false /* bypass limits */, absurd_fee);
+    }
 };
 
 class LockingStateImpl : public LockImpl, public UniqueLock<CCriticalSection>
@@ -177,6 +199,61 @@ public:
         LOCK(cs_main);
         return GuessVerificationProgress(Params().TxData(), LookupBlockIndex(block_hash));
     }
+    RBFTransactionState isRBFOptIn(const CTransaction& tx) override
+    {
+        LOCK(::mempool.cs);
+        return IsRBFOptIn(tx, ::mempool);
+    }
+    bool hasDescendantsInMempool(const uint256& txid) override
+    {
+        LOCK(::mempool.cs);
+        auto it_mp = ::mempool.mapTx.find(txid);
+        return it_mp != ::mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1;
+    }
+    void relayTransaction(const uint256& txid) override
+    {
+        CInv inv(MSG_TX, txid);
+        g_connman->ForEachNode([&inv](CNode* node) { node->PushInventory(inv); });
+    }
+    void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) override
+    {
+        ::mempool.GetTransactionAncestry(txid, ancestors, descendants);
+    }
+    bool checkChainLimits(CTransactionRef tx) override
+    {
+        LockPoints lp;
+        CTxMemPoolEntry entry(tx, 0, 0, 0, false, 0, lp);
+        CTxMemPool::setEntries ancestors;
+        auto limit_ancestor_count = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
+        auto limit_ancestor_size = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) * 1000;
+        auto limit_descendant_count = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
+        auto limit_descendant_size = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000;
+        std::string unused_error_string;
+        LOCK(::mempool.cs);
+        return ::mempool.CalculateMemPoolAncestors(entry, ancestors, limit_ancestor_count, limit_ancestor_size,
+            limit_descendant_count, limit_descendant_size, unused_error_string);
+    }
+    CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc) override
+    {
+        return ::feeEstimator.estimateSmartFee(num_blocks, calc, conservative);
+    }
+    unsigned int estimateMaxBlocks() override
+    {
+        return ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
+    }
+    CFeeRate mempoolMinFee() override
+    {
+        return ::mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
+    }
+    CAmount maxTxFee() override { return ::maxTxFee; }
+    bool getPruneMode() override { return ::fPruneMode; }
+    bool p2pEnabled() override { return g_connman != nullptr; }
+    bool isInitialBlockDownload() override { return IsInitialBlockDownload(); }
+    int64_t getAdjustedTime() override { return GetAdjustedTime(); }
+    void initMessage(const std::string& message) override { ::uiInterface.InitMessage(message); }
+    void initWarning(const std::string& message) override { InitWarning(message); }
+    void initError(const std::string& message) override { InitError(message); }
+    void loadWallet(std::unique_ptr<Wallet> wallet) override { ::uiInterface.LoadWallet(wallet); }
 };
 
 } // namespace
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 3a54b9164e..60f8570e36 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -5,20 +5,27 @@
 #ifndef BITCOIN_INTERFACES_CHAIN_H
 #define BITCOIN_INTERFACES_CHAIN_H
 
-#include <optional.h>
+#include <optional.h>               // For Optional and nullopt
+#include <policy/rbf.h>             // For RBFTransactionState
+#include <primitives/transaction.h> // For CTransactionRef
 
 #include <memory>
+#include <stddef.h>
 #include <stdint.h>
 #include <string>
 #include <vector>
 
 class CBlock;
 class CScheduler;
+class CValidationState;
 class uint256;
 struct CBlockLocator;
+struct FeeCalculation;
 
 namespace interfaces {
 
+class Wallet;
+
 //! Interface for giving wallet processes access to blockchain state.
 class Chain
 {
@@ -102,6 +109,13 @@ public:
         //! is guaranteed to be an ancestor of the block used to create the
         //! locator.
         virtual Optional<int> findLocatorFork(const CBlockLocator& locator) = 0;
+
+        //! Check if transaction will be final given chain height current time.
+        virtual bool checkFinalTx(const CTransaction& tx) = 0;
+
+        //! Add transaction to memory pool if the transaction fee is below the
+        //! amount specified by absurd_fee (as a safeguard). */
+        virtual bool submitToMemoryPool(CTransactionRef tx, CAmount absurd_fee, CValidationState& state) = 0;
     };
 
     //! Return Lock interface. Chain is locked when this is called, and
@@ -127,6 +141,60 @@ public:
     //! Estimate fraction of total transactions verified if blocks up to
     //! the specified block hash are verified.
     virtual double guessVerificationProgress(const uint256& block_hash) = 0;
+
+    //! Check if transaction is RBF opt in.
+    virtual RBFTransactionState isRBFOptIn(const CTransaction& tx) = 0;
+
+    //! Check if transaction has descendants in mempool.
+    virtual bool hasDescendantsInMempool(const uint256& txid) = 0;
+
+    //! Relay transaction.
+    virtual void relayTransaction(const uint256& txid) = 0;
+
+    //! Calculate mempool ancestor and descendant counts for the given transaction.
+    virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) = 0;
+
+    //! Check chain limits.
+    virtual bool checkChainLimits(CTransactionRef tx) = 0;
+
+    //! Estimate smart fee.
+    virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc = nullptr) = 0;
+
+    //! Fee estimator max target.
+    virtual unsigned int estimateMaxBlocks() = 0;
+
+    //! Pool min fee.
+    virtual CFeeRate mempoolMinFee() = 0;
+
+    //! Get node max tx fee setting (-maxtxfee).
+    //! This could be replaced by a per-wallet max fee, as proposed at
+    //! https://github.com/bitcoin/bitcoin/issues/15355
+    //! But for the time being, wallets call this to access the node setting.
+    virtual CAmount maxTxFee() = 0;
+
+    //! Check if pruning is enabled.
+    virtual bool getPruneMode() = 0;
+
+    //! Check if p2p enabled.
+    virtual bool p2pEnabled() = 0;
+
+    // Check if in IBD.
+    virtual bool isInitialBlockDownload() = 0;
+
+    //! Get adjusted time.
+    virtual int64_t getAdjustedTime() = 0;
+
+    //! Send init message.
+    virtual void initMessage(const std::string& message) = 0;
+
+    //! Send init warning.
+    virtual void initWarning(const std::string& message) = 0;
+
+    //! Send init error.
+    virtual void initError(const std::string& message) = 0;
+
+    //! Send wallet load notification to the GUI.
+    virtual void loadWallet(std::unique_ptr<Wallet> wallet) = 0;
 };
 
 //! Interface to let node manage chain clients (wallets, or maybe tools for
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 96bde7e9f2..6f7dce0c24 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -275,7 +275,7 @@ public:
     }
     std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) override
     {
-        return MakeHandler(::uiInterface.LoadWallet_connect([fn](std::shared_ptr<CWallet> wallet) { fn(MakeWallet(wallet)); }));
+        return MakeHandler(::uiInterface.LoadWallet_connect([fn](std::unique_ptr<Wallet>& wallet) { fn(std::move(wallet)); }));
     }
     std::unique_ptr<Handler> handleNotifyNumConnectionsChanged(NotifyNumConnectionsChangedFn fn) override
     {
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 0dac75834e..7abbee0912 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -56,7 +56,7 @@ public:
         auto locked_chain = m_wallet.chain().lock();
         LOCK(m_wallet.cs_wallet);
         CValidationState state;
-        if (!m_wallet.CommitTransaction(m_tx, std::move(value_map), std::move(order_form), m_key, g_connman.get(), state)) {
+        if (!m_wallet.CommitTransaction(m_tx, std::move(value_map), std::move(order_form), m_key, state)) {
             reject_reason = state.GetRejectReason();
             return false;
         }
@@ -99,7 +99,7 @@ WalletTx MakeWalletTx(interfaces::Chain::Lock& locked_chain, CWallet& wallet, co
 //! Construct wallet tx status struct.
 WalletTxStatus MakeWalletTxStatus(interfaces::Chain::Lock& locked_chain, const CWalletTx& wtx)
 {
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
+    LockAnnotation lock(::cs_main); // Temporary, for mapBlockIndex below. Removed in upcoming commit.
 
     WalletTxStatus result;
     auto mi = ::mapBlockIndex.find(wtx.hashBlock);
@@ -109,7 +109,7 @@ WalletTxStatus MakeWalletTxStatus(interfaces::Chain::Lock& locked_chain, const C
     result.depth_in_main_chain = wtx.GetDepthInMainChain(locked_chain);
     result.time_received = wtx.nTimeReceived;
     result.lock_time = wtx.tx->nLockTime;
-    result.is_final = CheckFinalTx(*wtx.tx);
+    result.is_final = locked_chain.checkFinalTx(*wtx.tx);
     result.is_trusted = wtx.IsTrusted(locked_chain);
     result.is_abandoned = wtx.isAbandoned();
     result.is_coinbase = wtx.IsCoinBase();
@@ -457,7 +457,7 @@ public:
     {
         FeeCalculation fee_calc;
         CAmount result;
-        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, ::mempool, ::feeEstimator, &fee_calc);
+        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);
         if (returned_target) *returned_target = fee_calc.returnedTarget;
         if (reason) *reason = fee_calc.reason;
         return result;
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 6625a03bbd..f2acb8fbf5 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -843,7 +843,8 @@ static UniValue estimatesmartfee(const JSONRPCRequest& request)
 
     RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VSTR});
     RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
-    unsigned int conf_target = ParseConfirmTarget(request.params[0]);
+    unsigned int max_target = ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
+    unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
     bool conservative = true;
     if (!request.params[1].isNull()) {
         FeeEstimateMode fee_mode;
@@ -915,7 +916,8 @@ static UniValue estimaterawfee(const JSONRPCRequest& request)
 
     RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VNUM}, true);
     RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
-    unsigned int conf_target = ParseConfirmTarget(request.params[0]);
+    unsigned int max_target = ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
+    unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
     double threshold = 0.95;
     if (!request.params[1].isNull()) {
         threshold = request.params[1].get_real();
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 40ac133186..10979b43b0 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -4,11 +4,9 @@
 
 #include <key_io.h>
 #include <keystore.h>
-#include <policy/fees.h>
 #include <rpc/util.h>
 #include <tinyformat.h>
 #include <util/strencodings.h>
-#include <validation.h>
 
 InitInterfaces* g_rpc_interfaces = nullptr;
 
@@ -130,10 +128,9 @@ UniValue DescribeAddress(const CTxDestination& dest)
     return boost::apply_visitor(DescribeAddressVisitor(), dest);
 }
 
-unsigned int ParseConfirmTarget(const UniValue& value)
+unsigned int ParseConfirmTarget(const UniValue& value, unsigned int max_target)
 {
     int target = value.get_int();
-    unsigned int max_target = ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
     if (target < 1 || (unsigned int)target > max_target) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid conf_target, must be between %u - %u", 1, max_target));
     }
diff --git a/src/rpc/util.h b/src/rpc/util.h
index f1bd2c89df..e4cc1fde44 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -33,7 +33,7 @@ CScript CreateMultisigRedeemscript(const int required, const std::vector<CPubKey
 UniValue DescribeAddress(const CTxDestination& dest);
 
 //! Parse a confirm target option and raise an RPC error if it is invalid.
-unsigned int ParseConfirmTarget(const UniValue& value);
+unsigned int ParseConfirmTarget(const UniValue& value, unsigned int max_target);
 
 RPCErrorCode RPCErrorFromTransactionError(TransactionError terr);
 UniValue JSONRPCTransactionError(TransactionError terr, const std::string& err_string = "");
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
index 947d7e2308..16ab24686b 100644
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -52,7 +52,7 @@ void CClientUIInterface::InitMessage(const std::string& message) { return g_ui_s
 void CClientUIInterface::NotifyNumConnectionsChanged(int newNumConnections) { return g_ui_signals.NotifyNumConnectionsChanged(newNumConnections); }
 void CClientUIInterface::NotifyNetworkActiveChanged(bool networkActive) { return g_ui_signals.NotifyNetworkActiveChanged(networkActive); }
 void CClientUIInterface::NotifyAlertChanged() { return g_ui_signals.NotifyAlertChanged(); }
-void CClientUIInterface::LoadWallet(std::shared_ptr<CWallet> wallet) { return g_ui_signals.LoadWallet(wallet); }
+void CClientUIInterface::LoadWallet(std::unique_ptr<interfaces::Wallet>& wallet) { return g_ui_signals.LoadWallet(wallet); }
 void CClientUIInterface::ShowProgress(const std::string& title, int nProgress, bool resume_possible) { return g_ui_signals.ShowProgress(title, nProgress, resume_possible); }
 void CClientUIInterface::NotifyBlockTip(bool b, const CBlockIndex* i) { return g_ui_signals.NotifyBlockTip(b, i); }
 void CClientUIInterface::NotifyHeaderTip(bool b, const CBlockIndex* i) { return g_ui_signals.NotifyHeaderTip(b, i); }
diff --git a/src/ui_interface.h b/src/ui_interface.h
index fe466b3ca4..f1aebce3bb 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -11,7 +11,6 @@
 #include <stdint.h>
 #include <string>
 
-class CWallet;
 class CBlockIndex;
 namespace boost {
 namespace signals2 {
@@ -19,6 +18,10 @@ class connection;
 }
 } // namespace boost
 
+namespace interfaces {
+class Wallet;
+} // namespace interfaces
+
 /** General change type (added, updated, removed). */
 enum ChangeType
 {
@@ -102,7 +105,7 @@ public:
     ADD_SIGNALS_DECL_WRAPPER(NotifyAlertChanged, void, );
 
     /** A wallet has been loaded. */
-    ADD_SIGNALS_DECL_WRAPPER(LoadWallet, void, std::shared_ptr<CWallet> wallet);
+    ADD_SIGNALS_DECL_WRAPPER(LoadWallet, void, std::unique_ptr<interfaces::Wallet>& wallet);
 
     /**
      * Show progress e.g. for verifychain.
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index 7a71aea715..a1c3a21d4b 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -27,9 +27,7 @@ static feebumper::Result PreconditionChecks(interfaces::Chain::Lock& locked_chai
     }
 
     {
-        LOCK(mempool.cs);
-        auto it_mp = mempool.mapTx.find(wtx.GetHash());
-        if (it_mp != mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1) {
+        if (wallet->chain().hasDescendantsInMempool(wtx.GetHash())) {
             errors.push_back("Transaction has descendants in the mempool");
             return feebumper::Result::INVALID_PARAMETER;
         }
@@ -146,7 +144,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
         new_fee = total_fee;
         nNewFeeRate = CFeeRate(total_fee, maxNewTxSize);
     } else {
-        new_fee = GetMinimumFee(*wallet, maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
+        new_fee = GetMinimumFee(*wallet, maxNewTxSize, coin_control, nullptr /* FeeCalculation */);
         nNewFeeRate = CFeeRate(new_fee, maxNewTxSize);
 
         // New fee rate must be at least old rate + minimum incremental relay rate
@@ -197,7 +195,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
 
     // If the output would become dust, discard it (converting the dust to fee)
     poutput->nValue -= nDelta;
-    if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(*wallet, ::feeEstimator))) {
+    if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(*wallet))) {
         wallet->WalletLogPrintf("Bumping fee and discarding dust output\n");
         new_fee += poutput->nValue;
         mtx.vout.erase(mtx.vout.begin() + nOutput);
@@ -247,7 +245,7 @@ Result CommitTransaction(CWallet* wallet, const uint256& txid, CMutableTransacti
 
     CReserveKey reservekey(wallet);
     CValidationState state;
-    if (!wallet->CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, reservekey, g_connman.get(), state)) {
+    if (!wallet->CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, reservekey, state)) {
         // NOTE: CommitTransaction never returns false, so this should never happen.
         errors.push_back(strprintf("The transaction was rejected: %s", FormatStateMessage(state)));
         return Result::WALLET_ERROR;
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
index 9e2984ff05..545adaebc1 100644
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -6,7 +6,6 @@
 #include <wallet/fees.h>
 
 #include <policy/policy.h>
-#include <txmempool.h>
 #include <util/system.h>
 #include <validation.h>
 #include <wallet/coincontrol.h>
@@ -19,9 +18,9 @@ CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes)
 }
 
 
-CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc)
+CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, FeeCalculation* feeCalc)
 {
-    CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, pool, estimator, feeCalc).GetFee(nTxBytes);
+    CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, feeCalc).GetFee(nTxBytes);
     // Always obey the maximum
     if (fee_needed > maxTxFee) {
         fee_needed = maxTxFee;
@@ -35,7 +34,7 @@ CFeeRate GetRequiredFeeRate(const CWallet& wallet)
     return std::max(wallet.m_min_fee, ::minRelayTxFee);
 }
 
-CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc)
+CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, FeeCalculation* feeCalc)
 {
     /* User control of how to calculate fee uses the following parameter precedence:
        1. coin_control.m_feerate
@@ -64,7 +63,7 @@ CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_contr
         if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
         else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
 
-        feerate_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate);
+        feerate_needed = wallet.chain().estimateSmartFee(target, conservative_estimate, feeCalc);
         if (feerate_needed == CFeeRate(0)) {
             // if we don't have enough data for estimateSmartFee, then use fallback fee
             feerate_needed = wallet.m_fallback_fee;
@@ -74,7 +73,7 @@ CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_contr
             if (wallet.m_fallback_fee == CFeeRate(0)) return feerate_needed;
         }
         // Obey mempool min fee when using smart fee estimation
-        CFeeRate min_mempool_feerate = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
+        CFeeRate min_mempool_feerate = wallet.chain().mempoolMinFee();
         if (feerate_needed < min_mempool_feerate) {
             feerate_needed = min_mempool_feerate;
             if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
@@ -90,10 +89,10 @@ CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_contr
     return feerate_needed;
 }
 
-CFeeRate GetDiscardRate(const CWallet& wallet, const CBlockPolicyEstimator& estimator)
+CFeeRate GetDiscardRate(const CWallet& wallet)
 {
-    unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
-    CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, false /* conservative */);
+    unsigned int highest_target = wallet.chain().estimateMaxBlocks();
+    CFeeRate discard_rate = wallet.chain().estimateSmartFee(highest_target, false /* conservative */);
     // Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
     discard_rate = (discard_rate == CFeeRate(0)) ? wallet.m_discard_rate : std::min(discard_rate, wallet.m_discard_rate);
     // Discard rate must be at least dustRelayFee
diff --git a/src/wallet/fees.h b/src/wallet/fees.h
index 6bfee456c0..434f211dc2 100644
--- a/src/wallet/fees.h
+++ b/src/wallet/fees.h
@@ -8,10 +8,8 @@
 
 #include <amount.h>
 
-class CBlockPolicyEstimator;
 class CCoinControl;
 class CFeeRate;
-class CTxMemPool;
 class CWallet;
 struct FeeCalculation;
 
@@ -25,7 +23,7 @@ CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes);
  * Estimate the minimum fee considering user set parameters
  * and the required fee
  */
-CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc);
+CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, FeeCalculation* feeCalc);
 
 /**
  * Return the minimum required feerate taking into account the
@@ -37,11 +35,11 @@ CFeeRate GetRequiredFeeRate(const CWallet& wallet);
  * Estimate the minimum fee rate considering user set parameters
  * and the required fee
  */
-CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc);
+CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, FeeCalculation* feeCalc);
 
 /**
  * Return the maximum feerate for discarding change.
  */
-CFeeRate GetDiscardRate(const CWallet& wallet, const CBlockPolicyEstimator& estimator);
+CFeeRate GetDiscardRate(const CWallet& wallet);
 
 #endif // BITCOIN_WALLET_FEES_H
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 20d540c8db..7ad343c15f 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -138,12 +138,15 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
         // The canonical path cleans the path, preventing >1 Berkeley environment instances for the same directory
         fs::path canonical_wallet_dir = fs::canonical(wallet_dir, error);
         if (error || !fs::exists(wallet_dir)) {
-            return InitError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
+            chain.initError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
+            return false;
         } else if (!fs::is_directory(wallet_dir)) {
-            return InitError(strprintf(_("Specified -walletdir \"%s\" is not a directory"), wallet_dir.string()));
+            chain.initError(strprintf(_("Specified -walletdir \"%s\" is not a directory"), wallet_dir.string()));
+            return false;
         // The canonical path transforms relative paths into absolute ones, so we check the non-canonical version
         } else if (!wallet_dir.is_absolute()) {
-            return InitError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
+            chain.initError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
+            return false;
         }
         gArgs.ForceSetArg("-walletdir", canonical_wallet_dir.string());
     }
@@ -164,14 +167,15 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
         WalletLocation location(wallet_file);
 
         if (!wallet_paths.insert(location.GetPath()).second) {
-            return InitError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), wallet_file));
+            chain.initError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), wallet_file));
+            return false;
         }
 
         std::string error_string;
         std::string warning_string;
         bool verify_success = CWallet::Verify(chain, location, salvage_wallet, error_string, warning_string);
-        if (!error_string.empty()) InitError(error_string);
-        if (!warning_string.empty()) InitWarning(warning_string);
+        if (!error_string.empty()) chain.initError(error_string);
+        if (!warning_string.empty()) chain.initWarning(warning_string);
         if (!verify_success) return false;
     }
 
diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index 5b0592e06d..684d900478 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -157,8 +157,9 @@ UniValue importprivkey(const JSONRPCRequest& request)
         if (!request.params[2].isNull())
             fRescan = request.params[2].get_bool();
 
-        if (fRescan && fPruneMode)
+        if (fRescan && pwallet->chain().getPruneMode()) {
             throw JSONRPCError(RPC_WALLET_ERROR, "Rescan is disabled in pruned mode");
+        }
 
         if (fRescan && !reserver.reserve()) {
             throw JSONRPCError(RPC_WALLET_ERROR, "Wallet is currently rescanning. Abort existing rescan or wait.");
@@ -313,8 +314,9 @@ UniValue importaddress(const JSONRPCRequest& request)
     if (!request.params[2].isNull())
         fRescan = request.params[2].get_bool();
 
-    if (fRescan && fPruneMode)
+    if (fRescan && pwallet->chain().getPruneMode()) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Rescan is disabled in pruned mode");
+    }
 
     WalletRescanReserver reserver(pwallet);
     if (fRescan && !reserver.reserve()) {
@@ -501,8 +503,9 @@ UniValue importpubkey(const JSONRPCRequest& request)
     if (!request.params[2].isNull())
         fRescan = request.params[2].get_bool();
 
-    if (fRescan && fPruneMode)
+    if (fRescan && pwallet->chain().getPruneMode()) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Rescan is disabled in pruned mode");
+    }
 
     WalletRescanReserver reserver(pwallet);
     if (fRescan && !reserver.reserve()) {
@@ -562,8 +565,9 @@ UniValue importwallet(const JSONRPCRequest& request)
                 },
             }.ToString());
 
-    if (fPruneMode)
+    if (pwallet->chain().getPruneMode()) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Importing wallets is disabled in pruned mode");
+    }
 
     WalletRescanReserver reserver(pwallet);
     if (!reserver.reserve()) {
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 47790fbf92..31a3209a49 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -123,8 +123,7 @@ static void WalletTxToJSON(interfaces::Chain& chain, interfaces::Chain::Lock& lo
     // Add opt-in RBF status
     std::string rbfStatus = "no";
     if (confirms <= 0) {
-        LOCK(mempool.cs);
-        RBFTransactionState rbfState = IsRBFOptIn(*wtx.tx, mempool);
+        RBFTransactionState rbfState = chain.isRBFOptIn(*wtx.tx);
         if (rbfState == RBFTransactionState::UNKNOWN)
             rbfStatus = "unknown";
         else if (rbfState == RBFTransactionState::REPLACEABLE_BIP125)
@@ -318,7 +317,7 @@ static CTransactionRef SendMoney(interfaces::Chain::Lock& locked_chain, CWallet
     if (nValue > curBalance)
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Insufficient funds");
 
-    if (pwallet->GetBroadcastTransactions() && !g_connman) {
+    if (pwallet->GetBroadcastTransactions() && !pwallet->chain().p2pEnabled()) {
         throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
     }
 
@@ -340,7 +339,7 @@ static CTransactionRef SendMoney(interfaces::Chain::Lock& locked_chain, CWallet
         throw JSONRPCError(RPC_WALLET_ERROR, strError);
     }
     CValidationState state;
-    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, reservekey, g_connman.get(), state)) {
+    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, reservekey, state)) {
         strError = strprintf("Error: The transaction was rejected! Reason given: %s", FormatStateMessage(state));
         throw JSONRPCError(RPC_WALLET_ERROR, strError);
     }
@@ -424,7 +423,7 @@ static UniValue sendtoaddress(const JSONRPCRequest& request)
     }
 
     if (!request.params[6].isNull()) {
-        coin_control.m_confirm_target = ParseConfirmTarget(request.params[6]);
+        coin_control.m_confirm_target = ParseConfirmTarget(request.params[6], pwallet->chain().estimateMaxBlocks());
     }
 
     if (!request.params[7].isNull()) {
@@ -606,7 +605,6 @@ static UniValue getreceivedbyaddress(const JSONRPCRequest& request)
     // the user could have gotten from another RPC command prior to now
     pwallet->BlockUntilSyncedToCurrentChain();
 
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
 
@@ -629,8 +627,9 @@ static UniValue getreceivedbyaddress(const JSONRPCRequest& request)
     CAmount nAmount = 0;
     for (const std::pair<const uint256, CWalletTx>& pairWtx : pwallet->mapWallet) {
         const CWalletTx& wtx = pairWtx.second;
-        if (wtx.IsCoinBase() || !CheckFinalTx(*wtx.tx))
+        if (wtx.IsCoinBase() || !locked_chain->checkFinalTx(*wtx.tx)) {
             continue;
+        }
 
         for (const CTxOut& txout : wtx.tx->vout)
             if (txout.scriptPubKey == scriptPubKey)
@@ -678,7 +677,6 @@ static UniValue getreceivedbylabel(const JSONRPCRequest& request)
     // the user could have gotten from another RPC command prior to now
     pwallet->BlockUntilSyncedToCurrentChain();
 
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
 
@@ -695,8 +693,9 @@ static UniValue getreceivedbylabel(const JSONRPCRequest& request)
     CAmount nAmount = 0;
     for (const std::pair<const uint256, CWalletTx>& pairWtx : pwallet->mapWallet) {
         const CWalletTx& wtx = pairWtx.second;
-        if (wtx.IsCoinBase() || !CheckFinalTx(*wtx.tx))
+        if (wtx.IsCoinBase() || !locked_chain->checkFinalTx(*wtx.tx)) {
             continue;
+        }
 
         for (const CTxOut& txout : wtx.tx->vout)
         {
@@ -860,7 +859,7 @@ static UniValue sendmany(const JSONRPCRequest& request)
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
 
-    if (pwallet->GetBroadcastTransactions() && !g_connman) {
+    if (pwallet->GetBroadcastTransactions() && !pwallet->chain().p2pEnabled()) {
         throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
     }
 
@@ -886,7 +885,7 @@ static UniValue sendmany(const JSONRPCRequest& request)
     }
 
     if (!request.params[6].isNull()) {
-        coin_control.m_confirm_target = ParseConfirmTarget(request.params[6]);
+        coin_control.m_confirm_target = ParseConfirmTarget(request.params[6], pwallet->chain().estimateMaxBlocks());
     }
 
     if (!request.params[7].isNull()) {
@@ -948,7 +947,7 @@ static UniValue sendmany(const JSONRPCRequest& request)
     if (!fCreated)
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, strFailReason);
     CValidationState state;
-    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, keyChange, g_connman.get(), state)) {
+    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, keyChange, state)) {
         strFailReason = strprintf("Transaction commit failed:: %s", FormatStateMessage(state));
         throw JSONRPCError(RPC_WALLET_ERROR, strFailReason);
     }
@@ -1050,8 +1049,6 @@ struct tallyitem
 
 static UniValue ListReceived(interfaces::Chain::Lock& locked_chain, CWallet * const pwallet, const UniValue& params, bool by_label) EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)
 {
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
-
     // Minimum confirmations
     int nMinDepth = 1;
     if (!params[0].isNull())
@@ -1082,8 +1079,9 @@ static UniValue ListReceived(interfaces::Chain::Lock& locked_chain, CWallet * co
     for (const std::pair<const uint256, CWalletTx>& pairWtx : pwallet->mapWallet) {
         const CWalletTx& wtx = pairWtx.second;
 
-        if (wtx.IsCoinBase() || !CheckFinalTx(*wtx.tx))
+        if (wtx.IsCoinBase() || !locked_chain.checkFinalTx(*wtx.tx)) {
             continue;
+        }
 
         int nDepth = wtx.GetDepthInMainChain(locked_chain);
         if (nDepth < nMinDepth)
@@ -2694,8 +2692,9 @@ static UniValue resendwallettransactions(const JSONRPCRequest& request)
              }.ToString()
             );
 
-    if (!g_connman)
+    if (!pwallet->chain().p2pEnabled()) {
         throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
+    }
 
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
@@ -2704,7 +2703,7 @@ static UniValue resendwallettransactions(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_WALLET_ERROR, "Error: Wallet transaction broadcasting is disabled with -walletbroadcast");
     }
 
-    std::vector<uint256> txids = pwallet->ResendWalletTransactionsBefore(*locked_chain, GetTime(), g_connman.get());
+    std::vector<uint256> txids = pwallet->ResendWalletTransactionsBefore(*locked_chain, GetTime());
     UniValue result(UniValue::VARR);
     for (const uint256& txid : txids)
     {
@@ -2993,7 +2992,7 @@ void FundTransaction(CWallet* const pwallet, CMutableTransaction& tx, CAmount& f
             if (options.exists("feeRate")) {
                 throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both conf_target and feeRate");
             }
-            coinControl.m_confirm_target = ParseConfirmTarget(options["conf_target"]);
+            coinControl.m_confirm_target = ParseConfirmTarget(options["conf_target"], pwallet->chain().estimateMaxBlocks());
         }
         if (options.exists("estimate_mode")) {
             if (options.exists("feeRate")) {
@@ -3283,7 +3282,7 @@ static UniValue bumpfee(const JSONRPCRequest& request)
         if (options.exists("confTarget") && options.exists("totalFee")) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "confTarget and totalFee options should not both be set. Please provide either a confirmation target for fee estimation or an explicit total fee for the transaction.");
         } else if (options.exists("confTarget")) { // TODO: alias this to conf_target
-            coin_control.m_confirm_target = ParseConfirmTarget(options["confTarget"]);
+            coin_control.m_confirm_target = ParseConfirmTarget(options["confTarget"], pwallet->chain().estimateMaxBlocks());
         } else if (options.exists("totalFee")) {
             totalFee = options["totalFee"].get_int64();
             if (totalFee <= 0) {
@@ -3837,7 +3836,7 @@ UniValue sethdseed(const JSONRPCRequest& request)
             }.ToString());
     }
 
-    if (IsInitialBlockDownload()) {
+    if (pwallet->chain().isInitialBlockDownload()) {
         throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Cannot set a new HD seed while still in Initial Block Download");
     }
 
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index e674b2faea..af57dbf5f6 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -368,7 +368,7 @@ public:
         CCoinControl dummy;
         BOOST_CHECK(wallet->CreateTransaction(*m_locked_chain, {recipient}, tx, reservekey, fee, changePos, error, dummy));
         CValidationState state;
-        BOOST_CHECK(wallet->CommitTransaction(tx, {}, {}, reservekey, nullptr, state));
+        BOOST_CHECK(wallet->CommitTransaction(tx, {}, {}, reservekey, state));
         CMutableTransaction blocktx;
         {
             LOCK(wallet->cs_wallet);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index cee31d5ac2..02f3a265d9 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -12,6 +12,7 @@
 #include <consensus/validation.h>
 #include <fs.h>
 #include <interfaces/chain.h>
+#include <interfaces/wallet.h>
 #include <key.h>
 #include <key_io.h>
 #include <keystore.h>
@@ -940,7 +941,7 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     wtx.BindWallet(this);
     bool fInsertedNew = ret.second;
     if (fInsertedNew) {
-        wtx.nTimeReceived = GetAdjustedTime();
+        wtx.nTimeReceived = chain().getAdjustedTime();
         wtx.nOrderPos = IncOrderPosNext(&batch);
         wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
         wtx.nTimeSmart = ComputeTimeSmart(wtx);
@@ -1886,25 +1887,21 @@ void CWallet::ReacceptWalletTransactions()
     for (const std::pair<const int64_t, CWalletTx*>& item : mapSorted) {
         CWalletTx& wtx = *(item.second);
         CValidationState state;
-        wtx.AcceptToMemoryPool(*locked_chain, maxTxFee, state);
+        wtx.AcceptToMemoryPool(*locked_chain, state);
     }
 }
 
-bool CWalletTx::RelayWalletTransaction(interfaces::Chain::Lock& locked_chain, CConnman* connman)
+bool CWalletTx::RelayWalletTransaction(interfaces::Chain::Lock& locked_chain)
 {
     assert(pwallet->GetBroadcastTransactions());
     if (!IsCoinBase() && !isAbandoned() && GetDepthInMainChain(locked_chain) == 0)
     {
         CValidationState state;
         /* GetDepthInMainChain already catches known conflicts. */
-        if (InMempool() || AcceptToMemoryPool(locked_chain, maxTxFee, state)) {
+        if (InMempool() || AcceptToMemoryPool(locked_chain, state)) {
             pwallet->WalletLogPrintf("Relaying wtx %s\n", GetHash().ToString());
-            if (connman) {
-                CInv inv(MSG_TX, GetHash());
-                connman->ForEachNode([&inv](CNode* pnode)
-                {
-                    pnode->PushInventory(inv);
-                });
+            if (pwallet->chain().p2pEnabled()) {
+                pwallet->chain().relayTransaction(GetHash());
                 return true;
             }
         }
@@ -2075,11 +2072,10 @@ bool CWalletTx::InMempool() const
 
 bool CWalletTx::IsTrusted(interfaces::Chain::Lock& locked_chain) const
 {
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
-
     // Quick answer in most cases
-    if (!CheckFinalTx(*tx))
+    if (!locked_chain.checkFinalTx(*tx)) {
         return false;
+    }
     int nDepth = GetDepthInMainChain(locked_chain);
     if (nDepth >= 1)
         return true;
@@ -2115,7 +2111,7 @@ bool CWalletTx::IsEquivalentTo(const CWalletTx& _tx) const
         return CTransaction(tx1) == CTransaction(tx2);
 }
 
-std::vector<uint256> CWallet::ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime, CConnman* connman)
+std::vector<uint256> CWallet::ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime)
 {
     std::vector<uint256> result;
 
@@ -2134,8 +2130,9 @@ std::vector<uint256> CWallet::ResendWalletTransactionsBefore(interfaces::Chain::
     for (const std::pair<const unsigned int, CWalletTx*>& item : mapSorted)
     {
         CWalletTx& wtx = *item.second;
-        if (wtx.RelayWalletTransaction(locked_chain, connman))
+        if (wtx.RelayWalletTransaction(locked_chain)) {
             result.push_back(wtx.GetHash());
+        }
     }
     return result;
 }
@@ -2159,7 +2156,7 @@ void CWallet::ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman
     // Rebroadcast unconfirmed txes older than 5 minutes before the last
     // block was found:
     auto locked_chain = chain().assumeLocked();  // Temporary. Removed in upcoming lock cleanup
-    std::vector<uint256> relayed = ResendWalletTransactionsBefore(*locked_chain, nBestBlockTime-5*60, connman);
+    std::vector<uint256> relayed = ResendWalletTransactionsBefore(*locked_chain, nBestBlockTime-5*60);
     if (!relayed.empty())
         WalletLogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed.size());
 }
@@ -2263,7 +2260,6 @@ CAmount CWallet::GetImmatureWatchOnlyBalance() const
 // trusted.
 CAmount CWallet::GetLegacyBalance(const isminefilter& filter, int minDepth) const
 {
-    LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
     auto locked_chain = chain().lock();
     LOCK(cs_wallet);
 
@@ -2271,7 +2267,7 @@ CAmount CWallet::GetLegacyBalance(const isminefilter& filter, int minDepth) cons
     for (const auto& entry : mapWallet) {
         const CWalletTx& wtx = entry.second;
         const int depth = wtx.GetDepthInMainChain(*locked_chain);
-        if (depth < 0 || !CheckFinalTx(*wtx.tx) || wtx.IsImmatureCoinBase(*locked_chain)) {
+        if (depth < 0 || !locked_chain->checkFinalTx(*wtx.tx) || wtx.IsImmatureCoinBase(*locked_chain)) {
             continue;
         }
 
@@ -2325,8 +2321,9 @@ void CWallet::AvailableCoins(interfaces::Chain::Lock& locked_chain, std::vector<
         const uint256& wtxid = entry.first;
         const CWalletTx* pcoin = &entry.second;
 
-        if (!CheckFinalTx(*pcoin->tx))
+        if (!locked_chain.checkFinalTx(*pcoin->tx)) {
             continue;
+        }
 
         if (pcoin->IsImmatureCoinBase(locked_chain))
             continue;
@@ -2488,10 +2485,10 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const CoinEligibil
         FeeCalculation feeCalc;
         CCoinControl temp;
         temp.m_confirm_target = 1008;
-        CFeeRate long_term_feerate = GetMinimumFeeRate(*this, temp, ::mempool, ::feeEstimator, &feeCalc);
+        CFeeRate long_term_feerate = GetMinimumFeeRate(*this, temp, &feeCalc);
 
         // Calculate cost of change
-        CAmount cost_of_change = GetDiscardRate(*this, ::feeEstimator).GetFee(coin_selection_params.change_spend_size) + coin_selection_params.effective_fee.GetFee(coin_selection_params.change_output_size);
+        CAmount cost_of_change = GetDiscardRate(*this).GetFee(coin_selection_params.change_spend_size) + coin_selection_params.effective_fee.GetFee(coin_selection_params.change_output_size);
 
         // Filter by the min conf specs and add to utxo_pool and calculate effective value
         for (OutputGroup& group : groups) {
@@ -2861,10 +2858,10 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
             CTxOut change_prototype_txout(0, scriptChange);
             coin_selection_params.change_output_size = GetSerializeSize(change_prototype_txout);
 
-            CFeeRate discard_rate = GetDiscardRate(*this, ::feeEstimator);
+            CFeeRate discard_rate = GetDiscardRate(*this);
 
             // Get the fee rate to use effective values in coin selection
-            CFeeRate nFeeRateNeeded = GetMinimumFeeRate(*this, coin_control, ::mempool, ::feeEstimator, &feeCalc);
+            CFeeRate nFeeRateNeeded = GetMinimumFeeRate(*this, coin_control, &feeCalc);
 
             nFeeRet = 0;
             bool pick_new_inputs = true;
@@ -2997,7 +2994,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
                     return false;
                 }
 
-                nFeeNeeded = GetMinimumFee(*this, nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
+                nFeeNeeded = GetMinimumFee(*this, nBytes, coin_control, &feeCalc);
                 if (feeCalc.reason == FeeReason::FALLBACK && !m_allow_fallback_fee) {
                     // eventually allow a fallback fee
                     strFailReason = _("Fee estimation failed. Fallbackfee is disabled. Wait a few blocks or enable -fallbackfee.");
@@ -3025,7 +3022,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
                     // change output. Only try this once.
                     if (nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
                         unsigned int tx_size_with_change = nBytes + coin_selection_params.change_output_size + 2; // Add 2 as a buffer in case increasing # of outputs changes compact size
-                        CAmount fee_needed_with_change = GetMinimumFee(*this, tx_size_with_change, coin_control, ::mempool, ::feeEstimator, nullptr);
+                        CAmount fee_needed_with_change = GetMinimumFee(*this, tx_size_with_change, coin_control, nullptr);
                         CAmount minimum_value_for_change = GetDustThreshold(change_prototype_txout, discard_rate);
                         if (nFeeRet >= fee_needed_with_change + minimum_value_for_change) {
                             pick_new_inputs = false;
@@ -3130,16 +3127,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
 
     if (gArgs.GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
         // Lastly, ensure this tx will pass the mempool's chain limits
-        LockPoints lp;
-        CTxMemPoolEntry entry(tx, 0, 0, 0, false, 0, lp);
-        CTxMemPool::setEntries setAncestors;
-        size_t nLimitAncestors = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
-        size_t nLimitAncestorSize = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
-        size_t nLimitDescendants = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
-        size_t nLimitDescendantSize = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
-        std::string errString;
-        LOCK(::mempool.cs);
-        if (!::mempool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) {
+        if (!chain().checkChainLimits(tx)) {
             strFailReason = _("Transaction has too long of a mempool chain");
             return false;
         }
@@ -3159,7 +3147,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
 /**
  * Call after CreateTransaction unless you want to abort
  */
-bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CReserveKey& reservekey, CConnman* connman, CValidationState& state)
+bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CReserveKey& reservekey, CValidationState& state)
 {
     {
         auto locked_chain = chain().lock();
@@ -3196,11 +3184,11 @@ bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::ve
         if (fBroadcastTransactions)
         {
             // Broadcast
-            if (!wtx.AcceptToMemoryPool(*locked_chain, maxTxFee, state)) {
+            if (!wtx.AcceptToMemoryPool(*locked_chain, state)) {
                 WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", FormatStateMessage(state));
                 // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
             } else {
-                wtx.RelayWalletTransaction(*locked_chain, connman);
+                wtx.RelayWalletTransaction(*locked_chain);
             }
         }
     }
@@ -4092,17 +4080,17 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     std::vector<CWalletTx> vWtx;
 
     if (gArgs.GetBoolArg("-zapwallettxes", false)) {
-        uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
+        chain.initMessage(_("Zapping all transactions from wallet..."));
 
         std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(chain, location, WalletDatabase::Create(location.GetPath()));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DBErrors::LOAD_OK) {
-            InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
+            chain.initError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
             return nullptr;
         }
     }
 
-    uiInterface.InitMessage(_("Loading wallet..."));
+    chain.initMessage(_("Loading wallet..."));
 
     int64_t nStart = GetTimeMillis();
     bool fFirstRun = true;
@@ -4113,26 +4101,26 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (nLoadWalletRet != DBErrors::LOAD_OK)
     {
         if (nLoadWalletRet == DBErrors::CORRUPT) {
-            InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
+            chain.initError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
             return nullptr;
         }
         else if (nLoadWalletRet == DBErrors::NONCRITICAL_ERROR)
         {
-            InitWarning(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
-                                         " or address book entries might be missing or incorrect."),
+            chain.initWarning(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
+                                          " or address book entries might be missing or incorrect."),
                 walletFile));
         }
         else if (nLoadWalletRet == DBErrors::TOO_NEW) {
-            InitError(strprintf(_("Error loading %s: Wallet requires newer version of %s"), walletFile, _(PACKAGE_NAME)));
+            chain.initError(strprintf(_("Error loading %s: Wallet requires newer version of %s"), walletFile, _(PACKAGE_NAME)));
             return nullptr;
         }
         else if (nLoadWalletRet == DBErrors::NEED_REWRITE)
         {
-            InitError(strprintf(_("Wallet needed to be rewritten: restart %s to complete"), _(PACKAGE_NAME)));
+            chain.initError(strprintf(_("Wallet needed to be rewritten: restart %s to complete"), _(PACKAGE_NAME)));
             return nullptr;
         }
         else {
-            InitError(strprintf(_("Error loading %s"), walletFile));
+            chain.initError(strprintf(_("Error loading %s"), walletFile));
             return nullptr;
         }
     }
@@ -4151,7 +4139,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             walletInstance->WalletLogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
         if (nMaxVersion < walletInstance->GetVersion())
         {
-            InitError(_("Cannot downgrade wallet"));
+            chain.initError(_("Cannot downgrade wallet"));
             return nullptr;
         }
         walletInstance->SetMaxVersion(nMaxVersion);
@@ -4164,7 +4152,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         // Do not upgrade versions to any version between HD_SPLIT and FEATURE_PRE_SPLIT_KEYPOOL unless already supporting HD_SPLIT
         int max_version = walletInstance->nWalletVersion;
         if (!walletInstance->CanSupportFeature(FEATURE_HD_SPLIT) && max_version >=FEATURE_HD_SPLIT && max_version < FEATURE_PRE_SPLIT_KEYPOOL) {
-            InitError(_("Cannot upgrade a non HD split wallet without upgrading to support pre split keypool. Please use -upgradewallet=169900 or -upgradewallet with no version specified."));
+            chain.initError(_("Cannot upgrade a non HD split wallet without upgrading to support pre split keypool. Please use -upgradewallet=169900 or -upgradewallet with no version specified."));
             return nullptr;
         }
 
@@ -4192,7 +4180,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         // Regenerate the keypool if upgraded to HD
         if (hd_upgrade) {
             if (!walletInstance->TopUpKeyPool()) {
-                InitError(_("Unable to generate keys"));
+                chain.initError(_("Unable to generate keys"));
                 return nullptr;
             }
         }
@@ -4216,7 +4204,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
 
         // Top up the keypool
         if (walletInstance->CanGenerateKeys() && !walletInstance->TopUpKeyPool()) {
-            InitError(_("Unable to generate initial keys"));
+            chain.initError(_("Unable to generate initial keys"));
             return nullptr;
         }
 
@@ -4224,34 +4212,34 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         walletInstance->ChainStateFlushed(locked_chain->getTipLocator());
     } else if (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS) {
         // Make it impossible to disable private keys after creation
-        InitError(strprintf(_("Error loading %s: Private keys can only be disabled during creation"), walletFile));
+        chain.initError(strprintf(_("Error loading %s: Private keys can only be disabled during creation"), walletFile));
         return NULL;
     } else if (walletInstance->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         LOCK(walletInstance->cs_KeyStore);
         if (!walletInstance->mapKeys.empty() || !walletInstance->mapCryptedKeys.empty()) {
-            InitWarning(strprintf(_("Warning: Private keys detected in wallet {%s} with disabled private keys"), walletFile));
+            chain.initWarning(strprintf(_("Warning: Private keys detected in wallet {%s} with disabled private keys"), walletFile));
         }
     }
 
     if (!gArgs.GetArg("-addresstype", "").empty() && !ParseOutputType(gArgs.GetArg("-addresstype", ""), walletInstance->m_default_address_type)) {
-        InitError(strprintf("Unknown address type '%s'", gArgs.GetArg("-addresstype", "")));
+        chain.initError(strprintf("Unknown address type '%s'", gArgs.GetArg("-addresstype", "")));
         return nullptr;
     }
 
     if (!gArgs.GetArg("-changetype", "").empty() && !ParseOutputType(gArgs.GetArg("-changetype", ""), walletInstance->m_default_change_type)) {
-        InitError(strprintf("Unknown change type '%s'", gArgs.GetArg("-changetype", "")));
+        chain.initError(strprintf("Unknown change type '%s'", gArgs.GetArg("-changetype", "")));
         return nullptr;
     }
 
     if (gArgs.IsArgSet("-mintxfee")) {
         CAmount n = 0;
         if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n) {
-            InitError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
+            chain.initError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
             return nullptr;
         }
         if (n > HIGH_TX_FEE_PER_KB) {
-            InitWarning(AmountHighWarn("-mintxfee") + " " +
-                        _("This is the minimum transaction fee you pay on every transaction."));
+            chain.initWarning(AmountHighWarn("-mintxfee") + " " +
+                              _("This is the minimum transaction fee you pay on every transaction."));
         }
         walletInstance->m_min_fee = CFeeRate(n);
     }
@@ -4260,12 +4248,12 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.IsArgSet("-fallbackfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK)) {
-            InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
+            chain.initError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            InitWarning(AmountHighWarn("-fallbackfee") + " " +
-                        _("This is the transaction fee you may pay when fee estimates are not available."));
+            chain.initWarning(AmountHighWarn("-fallbackfee") + " " +
+                              _("This is the transaction fee you may pay when fee estimates are not available."));
         }
         walletInstance->m_fallback_fee = CFeeRate(nFeePerK);
         walletInstance->m_allow_fallback_fee = nFeePerK != 0; //disable fallback fee in case value was set to 0, enable if non-null value
@@ -4273,28 +4261,28 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.IsArgSet("-discardfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK)) {
-            InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
+            chain.initError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            InitWarning(AmountHighWarn("-discardfee") + " " +
-                        _("This is the transaction fee you may discard if change is smaller than dust at this level"));
+            chain.initWarning(AmountHighWarn("-discardfee") + " " +
+                              _("This is the transaction fee you may discard if change is smaller than dust at this level"));
         }
         walletInstance->m_discard_rate = CFeeRate(nFeePerK);
     }
     if (gArgs.IsArgSet("-paytxfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK)) {
-            InitError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
+            chain.initError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            InitWarning(AmountHighWarn("-paytxfee") + " " +
-                        _("This is the transaction fee you will pay if you send a transaction."));
+            chain.initWarning(AmountHighWarn("-paytxfee") + " " +
+                              _("This is the transaction fee you will pay if you send a transaction."));
         }
         walletInstance->m_pay_tx_fee = CFeeRate(nFeePerK, 1000);
         if (walletInstance->m_pay_tx_fee < ::minRelayTxFee) {
-            InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
+            chain.initError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
                 gArgs.GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
             return nullptr;
         }
@@ -4335,20 +4323,19 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         //We can't rescan beyond non-pruned blocks, stop and throw an error
         //this might happen if a user uses an old wallet within a pruned node
         // or if he ran -disablewallet for a longer time, then decided to re-enable
-        if (fPruneMode)
-        {
+        if (chain.getPruneMode()) {
             int block_height = *tip_height;
             while (block_height > 0 && locked_chain->haveBlockOnDisk(block_height - 1) && rescan_height != block_height) {
                 --block_height;
             }
 
             if (rescan_height != block_height) {
-                InitError(_("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)"));
+                chain.initError(_("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)"));
                 return nullptr;
             }
         }
 
-        uiInterface.InitMessage(_("Rescanning..."));
+        chain.initMessage(_("Rescanning..."));
         walletInstance->WalletLogPrintf("Rescanning last %i blocks (from block %i)...\n", *tip_height - rescan_height, rescan_height);
 
         // No need to read and scan block if block was created before
@@ -4363,7 +4350,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         {
             WalletRescanReserver reserver(walletInstance.get());
             if (!reserver.reserve() || (ScanResult::SUCCESS != walletInstance->ScanForWalletTransactions(locked_chain->getBlockHash(rescan_height), {} /* stop block */, reserver, true /* update */).status)) {
-                InitError(_("Failed to rescan the wallet during initialization"));
+                chain.initError(_("Failed to rescan the wallet during initialization"));
                 return nullptr;
             }
         }
@@ -4396,7 +4383,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         }
     }
 
-    uiInterface.LoadWallet(walletInstance);
+    chain.loadWallet(interfaces::MakeWallet(walletInstance));
 
     // Register with the validation interface. It's ok to do this after rescan since we're still holding cs_main.
     RegisterValidationInterface(walletInstance.get());
@@ -4479,17 +4466,14 @@ bool CMerkleTx::IsImmatureCoinBase(interfaces::Chain::Lock& locked_chain) const
     return GetBlocksToMaturity(locked_chain) > 0;
 }
 
-bool CWalletTx::AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, const CAmount& nAbsurdFee, CValidationState& state)
+bool CWalletTx::AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValidationState& state)
 {
-    LockAnnotation lock(::cs_main); // Temporary, for AcceptToMemoryPool below. Removed in upcoming commit.
-
     // We must set fInMempool here - while it will be re-set to true by the
     // entered-mempool callback, if we did not there would be a race where a
     // user could call sendmoney in a loop and hit spurious out of funds errors
     // because we think that this newly generated transaction's change is
     // unavailable as we're not yet aware that it is in the mempool.
-    bool ret = ::AcceptToMemoryPool(mempool, state, tx, nullptr /* pfMissingInputs */,
-                                nullptr /* plTxnReplaced */, false /* bypass_limits */, nAbsurdFee);
+    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->chain().maxTxFee(), state);
     fInMempool |= ret;
     return ret;
 }
@@ -4520,7 +4504,7 @@ std::vector<OutputGroup> CWallet::GroupOutputs(const std::vector<COutput>& outpu
             CInputCoin input_coin = output.GetInputCoin();
 
             size_t ancestors, descendants;
-            mempool.GetTransactionAncestry(output.tx->GetHash(), ancestors, descendants);
+            chain().getTransactionAncestry(output.tx->GetHash(), ancestors, descendants);
             if (!single_coin && ExtractDestination(output.tx->tx->vout[output.i].scriptPubKey, dst)) {
                 // Limit output groups to no more than 10 entries, to protect
                 // against inadvertently creating a too-large transaction
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 5173f957c7..51e3edac34 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -100,8 +100,6 @@ class CCoinControl;
 class COutput;
 class CReserveKey;
 class CScript;
-class CTxMemPool;
-class CBlockPolicyEstimator;
 class CWalletTx;
 struct FeeCalculation;
 enum class FeeEstimateMode;
@@ -537,10 +535,10 @@ public:
     int64_t GetTxTime() const;
 
     // RelayWalletTransaction may only be called if fBroadcastTransactions!
-    bool RelayWalletTransaction(interfaces::Chain::Lock& locked_chain, CConnman* connman);
+    bool RelayWalletTransaction(interfaces::Chain::Lock& locked_chain);
 
     /** Pass this transaction to the mempool. Fails if absolute fee exceeds absurd fee. */
-    bool AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, const CAmount& nAbsurdFee, CValidationState& state);
+    bool AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValidationState& state);
 
     // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
     // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation
@@ -946,7 +944,7 @@ public:
     void ReacceptWalletTransactions();
     void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) override EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     // ResendWalletTransactionsBefore may only be called if fBroadcastTransactions!
-    std::vector<uint256> ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime, CConnman* connman);
+    std::vector<uint256> ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime);
     CAmount GetBalance(const isminefilter& filter=ISMINE_SPENDABLE, const int min_depth=0) const;
     CAmount GetUnconfirmedBalance() const;
     CAmount GetImmatureBalance() const;
@@ -971,7 +969,7 @@ public:
      */
     bool CreateTransaction(interfaces::Chain::Lock& locked_chain, const std::vector<CRecipient>& vecSend, CTransactionRef& tx, CReserveKey& reservekey, CAmount& nFeeRet, int& nChangePosInOut,
                            std::string& strFailReason, const CCoinControl& coin_control, bool sign = true);
-    bool CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CReserveKey& reservekey, CConnman* connman, CValidationState& state);
+    bool CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CReserveKey& reservekey, CValidationState& state);
 
     bool DummySignTx(CMutableTransaction &txNew, const std::set<CTxOut> &txouts, bool use_max_sig = false) const
     {