Merge #15638: Move-only: Pull wallet code out of libbitcoin_server

4d074e84a2cf419510e2920417799f62747f4b07 [build] Move AnalyzePSBT from psbt.cpp to node/psbt.cpp (Russell Yanofsky)
fd509bd1f71df628b933ea7a135a9a957a5e0136 [docs] Document src subdirectories and different libraries (John Newbery)
9eaeb7fb8d4ab0d4493849e6c17e314fd75fea9c [build] Move wallet load functions to wallet/load unit (John Newbery)
91a25d1e711bfc0617027eee18b9777ff368d6b9 [build] Add several util units (John Newbery)
99517866b62c261f990e1f897502855afc12f2a7 [build] Move several units into common libraries (John Newbery)
0509465542d63a5bbe7296f283f44dd491e74f78 [build] Move rpc rawtransaction util functions to rpc/rawtransaction_util.cpp (John Newbery)
1acc61f8746bc6efb905e121a9f607c4f5982b35 [build] Move rpc utility methods to rpc/util (John Newbery)
4a75c9d6512a5580e60104103ea11d2cd9586354 [build] Move policy settings to new src/policy/settings unit (John Newbery)
fdf8888b6f0c63e8a4cb1459752625e642d6a4dd [build] Move CheckTransaction from lib_server to lib_consensus (John Newbery)

Pull request description:

  This is a move-only commit. No code is changing and the moves can be easily verified with:

  ```sh
  git log -p -n1 --color-moved=dimmed_zebra
  ```

  This commit moves functions and variables that wallet code depends on out of libbitcoin_server.a, so the bitcoin-wallet tool can be built without libbitcoin_server.a in #15639, and attempting to access server state from wallet code will result in link errors instead of silently broken code.

  List of moves:

  - `CheckTransaction` moves from `consensus/tx_verify.cpp` to `consensus/tx_check.cpp`
  - `urlDecode` moves from `httpserver.cpp` to `util/url.cpp`
  - `TransactionErrorString` moves from `node/transaction.cpp` to `util/error.cpp`
  - `StringForFeeReason` and `FeeModeFromString` move from `policy/fees.cpp` to `util/fees.cpp`
  - `incrementalRelayFee` `dustRelayFee` and `nBytesPerSigOp` move from `policy/policy.cpp` to `policy/settings.cpp`
  - `SignalsOptInRBF` moves from `policy/rbf.cpp` to `util/rbf.cpp`
  - `fIsBareMultisigStd` moves from `validation.cpp` to `policy/settings.cpp`
  - `ConstructTransaction` `TxInErrorToJSON` and `SignTransaction` move from `rpc/rawtransaction.cpp` to `rpc/rawtransaction_util.cpp`
  - `RPCTypeCheck` `RPCTypeCheckArgument` `RPCTypeCheckObj` `AmountFromValue` `ParseHashV``ParseHashO` `ParseHexV` `ParseHexO` `HelpExampleCli` and `HelpExampleRpc` move from `rpc/server.cpp` to `rpc/util.cpp`
  - `AmountHighWarn` and `AmountErrMsg` move from `ui_interface.cpp` to `util/error.cpp`
  - `FormatStateMessage` and `strMessageMagic` move from `validation.cpp` to `util/validation.cpp`
  - `VerifyWallets` `LoadWallets` `StartWallets` `FlushWallets` `StopWallets` and `UnloadWallets` move from `wallet/init.cpp` to `wallet/node.cpp`

ACKs for commit 4d074e:
  jnewbery:
    utACK 4d074e84a2cf419510e2920417799f62747f4b07 (checked by doing the rebase myself and verifying no difference between my branch and 4d074e84a2cf419510e2920417799f62747f4b07)

Tree-SHA512: 5e1604a9fb06475f2b96da0de0baa8330f4dda834dc20a0183ef11e1e4c27631d1d1bbb9abf0054efc03d56945fdf9920f63366b6a4f200f665b742a479ff75c

69 files changed, 1222 insertions, 921 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 0385c825ea..cb0604391e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -124,6 +124,7 @@ BITCOIN_CORE_H = \
   compat/sanity.h \
   compressor.h \
   consensus/consensus.h \
+  consensus/tx_check.h \
   consensus/tx_verify.h \
   core_io.h \
   core_memusage.h \
@@ -155,6 +156,7 @@ BITCOIN_CORE_H = \
   netbase.h \
   netmessagemaker.h \
   node/coin.h \
+  node/psbt.h \
   node/transaction.h \
   noui.h \
   optional.h \
@@ -163,6 +165,7 @@ BITCOIN_CORE_H = \
   policy/fees.h \
   policy/policy.h \
   policy/rbf.h \
+  policy/settings.h \
   pow.h \
   protocol.h \
   psbt.h \
@@ -174,7 +177,7 @@ BITCOIN_CORE_H = \
   rpc/mining.h \
   rpc/protocol.h \
   rpc/server.h \
-  rpc/rawtransaction.h \
+  rpc/rawtransaction_util.h \
   rpc/register.h \
   rpc/util.h \
   scheduler.h \
@@ -201,10 +204,15 @@ BITCOIN_CORE_H = \
   undo.h \
   util/bip32.h \
   util/bytevectorhash.h \
+  util/error.h \
+  util/fees.h \
   util/system.h \
   util/memory.h \
   util/moneystr.h \
+  util/rbf.h \
   util/time.h \
+  util/url.h \
+  util/validation.h \
   validation.h \
   validationinterface.h \
   versionbits.h \
@@ -215,6 +223,7 @@ BITCOIN_CORE_H = \
   wallet/db.h \
   wallet/feebumper.h \
   wallet/fees.h \
+  wallet/load.h \
   wallet/psbtwallet.h \
   wallet/rpcwallet.h \
   wallet/wallet.h \
@@ -237,13 +246,15 @@ obj/build.h: FORCE
 libbitcoin_util_a-clientversion.$(OBJEXT): obj/build.h
 
 # server: shared between bitcoind and bitcoin-qt
+# Contains code accessing mempool and chain state that is meant to be separated
+# from wallet and gui code (see node/README.md). Shared code should go in
+# libbitcoin_common or libbitcoin_util libraries, instead.
 libbitcoin_server_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(MINIUPNPC_CPPFLAGS) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS)
 libbitcoin_server_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_server_a_SOURCES = \
   addrdb.cpp \
   addrman.cpp \
   banman.cpp \
-  bloom.cpp \
   blockencodings.cpp \
   blockfilter.cpp \
   chain.cpp \
@@ -255,21 +266,19 @@ libbitcoin_server_a_SOURCES = \
   index/base.cpp \
   index/txindex.cpp \
   interfaces/chain.cpp \
-  interfaces/handler.cpp \
   interfaces/node.cpp \
   init.cpp \
   dbwrapper.cpp \
-  merkleblock.cpp \
   miner.cpp \
   net.cpp \
   net_processing.cpp \
   node/coin.cpp \
+  node/psbt.cpp \
   node/transaction.cpp \
   noui.cpp \
-  outputtype.cpp \
   policy/fees.cpp \
-  policy/policy.cpp \
   policy/rbf.cpp \
+  policy/settings.cpp \
   pow.cpp \
   rest.cpp \
   rpc/blockchain.cpp \
@@ -278,7 +287,6 @@ libbitcoin_server_a_SOURCES = \
   rpc/net.cpp \
   rpc/rawtransaction.cpp \
   rpc/server.cpp \
-  rpc/util.cpp \
   script/sigcache.cpp \
   shutdown.cpp \
   timedata.cpp \
@@ -291,6 +299,9 @@ libbitcoin_server_a_SOURCES = \
   versionbits.cpp \
   $(BITCOIN_CORE_H)
 
+if ENABLE_WALLET
+libbitcoin_server_a_SOURCES += wallet/init.cpp
+endif
 if !ENABLE_WALLET
 libbitcoin_server_a_SOURCES += dummywallet.cpp
 endif
@@ -317,7 +328,7 @@ libbitcoin_wallet_a_SOURCES = \
   wallet/db.cpp \
   wallet/feebumper.cpp \
   wallet/fees.cpp \
-  wallet/init.cpp \
+  wallet/load.cpp \
   wallet/psbtwallet.cpp \
   wallet/rpcdump.cpp \
   wallet/rpcwallet.cpp \
@@ -391,6 +402,7 @@ libbitcoin_consensus_a_SOURCES = \
   consensus/merkle.cpp \
   consensus/merkle.h \
   consensus/params.h \
+  consensus/tx_check.cpp \
   consensus/validation.h \
   hash.cpp \
   hash.h \
@@ -423,6 +435,7 @@ libbitcoin_common_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_common_a_SOURCES = \
   base58.cpp \
   bech32.cpp \
+  bloom.cpp \
   chainparams.cpp \
   coins.cpp \
   compressor.cpp \
@@ -431,11 +444,16 @@ libbitcoin_common_a_SOURCES = \
   key.cpp \
   key_io.cpp \
   keystore.cpp \
+  merkleblock.cpp \
   netaddress.cpp \
   netbase.cpp \
+  outputtype.cpp \
   policy/feerate.cpp \
+  policy/policy.cpp \
   protocol.cpp \
   psbt.cpp \
+  rpc/rawtransaction_util.cpp \
+  rpc/util.cpp \
   scheduler.cpp \
   script/descriptor.cpp \
   script/ismine.cpp \
@@ -458,6 +476,7 @@ libbitcoin_util_a_SOURCES = \
   compat/glibcxx_sanity.cpp \
   compat/strnlen.cpp \
   fs.cpp \
+  interfaces/handler.cpp \
   logging.cpp \
   random.cpp \
   rpc/protocol.cpp \
@@ -466,10 +485,15 @@ libbitcoin_util_a_SOURCES = \
   threadinterrupt.cpp \
   util/bip32.cpp \
   util/bytevectorhash.cpp \
+  util/error.cpp \
+  util/fees.cpp \
   util/system.cpp \
   util/moneystr.cpp \
+  util/rbf.cpp \
   util/strencodings.cpp \
   util/time.cpp \
+  util/url.cpp \
+  util/validation.cpp \
   $(BITCOIN_CORE_H)
 
 if GLIBC_BACK_COMPAT
diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index 4be89aab6c..7f41ea7aed 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -18,6 +18,7 @@
 #include <script/script.h>
 #include <script/sign.h>
 #include <univalue.h>
+#include <util/rbf.h>
 #include <util/system.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
diff --git a/src/consensus/tx_check.cpp b/src/consensus/tx_check.cpp
new file mode 100644
index 0000000000..61a607ef7f
--- /dev/null
+++ b/src/consensus/tx_check.cpp
@@ -0,0 +1,57 @@
+// Copyright (c) 2017-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <consensus/tx_check.h>
+
+#include <primitives/transaction.h>
+#include <consensus/validation.h>
+
+bool CheckTransaction(const CTransaction& tx, CValidationState &state, bool fCheckDuplicateInputs)
+{
+    // Basic checks that don't depend on any context
+    if (tx.vin.empty())
+        return state.DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty");
+    if (tx.vout.empty())
+        return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty");
+    // Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
+    if (::GetSerializeSize(tx, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
+        return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize");
+
+    // Check for negative or overflow output values
+    CAmount nValueOut = 0;
+    for (const auto& txout : tx.vout)
+    {
+        if (txout.nValue < 0)
+            return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-negative");
+        if (txout.nValue > MAX_MONEY)
+            return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-toolarge");
+        nValueOut += txout.nValue;
+        if (!MoneyRange(nValueOut))
+            return state.DoS(100, false, REJECT_INVALID, "bad-txns-txouttotal-toolarge");
+    }
+
+    // Check for duplicate inputs - note that this check is slow so we skip it in CheckBlock
+    if (fCheckDuplicateInputs) {
+        std::set<COutPoint> vInOutPoints;
+        for (const auto& txin : tx.vin)
+        {
+            if (!vInOutPoints.insert(txin.prevout).second)
+                return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-duplicate");
+        }
+    }
+
+    if (tx.IsCoinBase())
+    {
+        if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
+            return state.DoS(100, false, REJECT_INVALID, "bad-cb-length");
+    }
+    else
+    {
+        for (const auto& txin : tx.vin)
+            if (txin.prevout.IsNull())
+                return state.DoS(10, false, REJECT_INVALID, "bad-txns-prevout-null");
+    }
+
+    return true;
+}
diff --git a/src/consensus/tx_check.h b/src/consensus/tx_check.h
new file mode 100644
index 0000000000..bcfdf36bf9
--- /dev/null
+++ b/src/consensus/tx_check.h
@@ -0,0 +1,20 @@
+// Copyright (c) 2017-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_CONSENSUS_TX_CHECK_H
+#define BITCOIN_CONSENSUS_TX_CHECK_H
+
+/**
+ * Context-independent transaction checking code that can be called outside the
+ * bitcoin server and doesn't depend on chain or mempool state. Transaction
+ * verification code that does call server functions or depend on server state
+ * belongs in tx_verify.h/cpp instead.
+ */
+
+class CTransaction;
+class CValidationState;
+
+bool CheckTransaction(const CTransaction& tx, CValidationState& state, bool fCheckDuplicateInputs=true);
+
+#endif // BITCOIN_CONSENSUS_TX_CHECK_H
diff --git a/src/consensus/tx_verify.cpp b/src/consensus/tx_verify.cpp
index 0a7eacfb91..fbbbcfd040 100644
--- a/src/consensus/tx_verify.cpp
+++ b/src/consensus/tx_verify.cpp
@@ -156,55 +156,6 @@ int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& i
     return nSigOps;
 }
 
-bool CheckTransaction(const CTransaction& tx, CValidationState &state, bool fCheckDuplicateInputs)
-{
-    // Basic checks that don't depend on any context
-    if (tx.vin.empty())
-        return state.DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty");
-    if (tx.vout.empty())
-        return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty");
-    // Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
-    if (::GetSerializeSize(tx, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
-        return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize");
-
-    // Check for negative or overflow output values
-    CAmount nValueOut = 0;
-    for (const auto& txout : tx.vout)
-    {
-        if (txout.nValue < 0)
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-negative");
-        if (txout.nValue > MAX_MONEY)
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-toolarge");
-        nValueOut += txout.nValue;
-        if (!MoneyRange(nValueOut))
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-txouttotal-toolarge");
-    }
-
-    // Check for duplicate inputs - note that this check is slow so we skip it in CheckBlock
-    if (fCheckDuplicateInputs) {
-        std::set<COutPoint> vInOutPoints;
-        for (const auto& txin : tx.vin)
-        {
-            if (!vInOutPoints.insert(txin.prevout).second)
-                return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-duplicate");
-        }
-    }
-
-    if (tx.IsCoinBase())
-    {
-        if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
-            return state.DoS(100, false, REJECT_INVALID, "bad-cb-length");
-    }
-    else
-    {
-        for (const auto& txin : tx.vin)
-            if (txin.prevout.IsNull())
-                return state.DoS(10, false, REJECT_INVALID, "bad-txns-prevout-null");
-    }
-
-    return true;
-}
-
 bool Consensus::CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight, CAmount& txfee)
 {
     // are the actual inputs available?
diff --git a/src/consensus/tx_verify.h b/src/consensus/tx_verify.h
index 0519cef8c0..3519fc555d 100644
--- a/src/consensus/tx_verify.h
+++ b/src/consensus/tx_verify.h
@@ -17,9 +17,6 @@ class CValidationState;
 
 /** Transaction validation functions */
 
-/** Context-independent validity checks */
-bool CheckTransaction(const CTransaction& tx, CValidationState& state, bool fCheckDuplicateInputs=true);
-
 namespace Consensus {
 /**
  * Check whether all inputs of this transaction are valid (no double spends and amounts)
diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index b9ca037c9d..5d9c3d2c1a 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -655,15 +655,3 @@ void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch)
         pathHandlers.erase(i);
     }
 }
-
-std::string urlDecode(const std::string &urlEncoded) {
-    std::string res;
-    if (!urlEncoded.empty()) {
-        char *decoded = evhttp_uridecode(urlEncoded.c_str(), false, nullptr);
-        if (decoded) {
-            res = std::string(decoded);
-            free(decoded);
-        }
-    }
-    return res;
-}
diff --git a/src/httpserver.h b/src/httpserver.h
index 63f96734f8..7943f0094b 100644
--- a/src/httpserver.h
+++ b/src/httpserver.h
@@ -148,6 +148,4 @@ private:
     struct event* ev;
 };
 
-std::string urlDecode(const std::string &urlEncoded);
-
 #endif // BITCOIN_HTTPSERVER_H
diff --git a/src/init.cpp b/src/init.cpp
index ec8800ef07..2b538fb836 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -31,6 +31,7 @@
 #include <policy/feerate.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <rpc/server.h>
 #include <rpc/register.h>
 #include <rpc/blockchain.h>
@@ -46,6 +47,7 @@
 #include <ui_interface.h>
 #include <util/system.h>
 #include <util/moneystr.h>
+#include <util/validation.h>
 #include <validationinterface.h>
 #include <warnings.h>
 #include <walletinitinterface.h>
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index f278e5de95..13e7848cc6 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -13,6 +13,7 @@
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <policy/rbf.h>
+#include <policy/settings.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
 #include <protocol.h>
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 6f7dce0c24..73a5074133 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -20,6 +20,7 @@
 #include <policy/feerate.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <primitives/block.h>
 #include <rpc/server.h>
 #include <scheduler.h>
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 0bb9739c9c..f98a49f9b1 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -29,6 +29,7 @@
 #include <wallet/feebumper.h>
 #include <wallet/fees.h>
 #include <wallet/rpcwallet.h>
+#include <wallet/load.h>
 #include <wallet/wallet.h>
 #include <wallet/walletutil.h>
 
diff --git a/src/miner.cpp b/src/miner.cpp
index 80a2f8f018..6a88e8321d 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -23,6 +23,7 @@
 #include <timedata.h>
 #include <util/moneystr.h>
 #include <util/system.h>
+#include <util/validation.h>
 #include <validationinterface.h>
 
 #include <algorithm>
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 044fcc90cd..74e33189dc 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -29,6 +29,7 @@
 #include <util/system.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
+#include <util/validation.h>
 
 #include <memory>
 
diff --git a/src/node/README.md b/src/node/README.md
new file mode 100644
index 0000000000..e99a717534
--- /dev/null
+++ b/src/node/README.md
@@ -0,0 +1,22 @@
+# src/node/
+
+The [`src/node/`](./) directory contains code that needs to access node state
+(state in `CChain`, `CBlockIndex`, `CCoinsView`, `CTxMemPool`, and similar
+classes).
+
+Code in [`src/node/`](./) is meant to be segregated from code in
+[`src/wallet/`](../wallet/) and [`src/qt/`](../qt/), to ensure wallet and GUI
+code changes don't interfere with node operation, to allow wallet and GUI code
+to run in separate processes, and to perhaps eventually allow wallet and GUI
+code to be maintained in separate source repositories.
+
+As a rule of thumb, code in one of the [`src/node/`](./),
+[`src/wallet/`](../wallet/), or [`src/qt/`](../qt/) directories should avoid
+calling code in the other directories directly, and only invoke it indirectly
+through the more limited [`src/interfaces/`](../interfaces/) classes.
+
+The [`src/node/`](./) directory is a new directory introduced in
+[#14978](https://github.com/bitcoin/bitcoin/pull/14978) and at the moment is
+sparsely populated. Eventually more substantial files like
+[`src/validation.cpp`](../validation.cpp) and
+[`src/txmempool.cpp`](../txmempool.cpp) might be moved there.
diff --git a/src/node/psbt.cpp b/src/node/psbt.cpp
new file mode 100644
index 0000000000..12559c5a5f
--- /dev/null
+++ b/src/node/psbt.cpp
@@ -0,0 +1,134 @@
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <coins.h>
+#include <consensus/tx_verify.h>
+#include <node/psbt.h>
+#include <policy/policy.h>
+#include <policy/settings.h>
+
+#include <numeric>
+
+PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
+{
+    // Go through each input and build status
+    PSBTAnalysis result;
+
+    bool calc_fee = true;
+    bool all_final = true;
+    bool only_missing_sigs = true;
+    bool only_missing_final = false;
+    CAmount in_amt = 0;
+
+    result.inputs.resize(psbtx.tx->vin.size());
+
+    for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
+        PSBTInput& input = psbtx.inputs[i];
+        PSBTInputAnalysis& input_analysis = result.inputs[i];
+
+        // Check for a UTXO
+        CTxOut utxo;
+        if (psbtx.GetInputUTXO(utxo, i)) {
+            in_amt += utxo.nValue;
+            input_analysis.has_utxo = true;
+        } else {
+            input_analysis.has_utxo = false;
+            input_analysis.is_final = false;
+            input_analysis.next = PSBTRole::UPDATER;
+            calc_fee = false;
+        }
+
+        // Check if it is final
+        if (!utxo.IsNull() && !PSBTInputSigned(input)) {
+            input_analysis.is_final = false;
+            all_final = false;
+
+            // Figure out what is missing
+            SignatureData outdata;
+            bool complete = SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, &outdata);
+
+            // Things are missing
+            if (!complete) {
+                input_analysis.missing_pubkeys = outdata.missing_pubkeys;
+                input_analysis.missing_redeem_script = outdata.missing_redeem_script;
+                input_analysis.missing_witness_script = outdata.missing_witness_script;
+                input_analysis.missing_sigs = outdata.missing_sigs;
+
+                // If we are only missing signatures and nothing else, then next is signer
+                if (outdata.missing_pubkeys.empty() && outdata.missing_redeem_script.IsNull() && outdata.missing_witness_script.IsNull() && !outdata.missing_sigs.empty()) {
+                    input_analysis.next = PSBTRole::SIGNER;
+                } else {
+                    only_missing_sigs = false;
+                    input_analysis.next = PSBTRole::UPDATER;
+                }
+            } else {
+                only_missing_final = true;
+                input_analysis.next = PSBTRole::FINALIZER;
+            }
+        } else if (!utxo.IsNull()){
+            input_analysis.is_final = true;
+        }
+    }
+
+    if (all_final) {
+        only_missing_sigs = false;
+        result.next = PSBTRole::EXTRACTOR;
+    }
+    if (calc_fee) {
+        // Get the output amount
+        CAmount out_amt = std::accumulate(psbtx.tx->vout.begin(), psbtx.tx->vout.end(), CAmount(0),
+            [](CAmount a, const CTxOut& b) {
+                return a += b.nValue;
+            }
+        );
+
+        // Get the fee
+        CAmount fee = in_amt - out_amt;
+        result.fee = fee;
+
+        // Estimate the size
+        CMutableTransaction mtx(*psbtx.tx);
+        CCoinsView view_dummy;
+        CCoinsViewCache view(&view_dummy);
+        bool success = true;
+
+        for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
+            PSBTInput& input = psbtx.inputs[i];
+            Coin newcoin;
+
+            if (!SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, nullptr, true) || !psbtx.GetInputUTXO(newcoin.out, i)) {
+                success = false;
+                break;
+            } else {
+                mtx.vin[i].scriptSig = input.final_script_sig;
+                mtx.vin[i].scriptWitness = input.final_script_witness;
+                newcoin.nHeight = 1;
+                view.AddCoin(psbtx.tx->vin[i].prevout, std::move(newcoin), true);
+            }
+        }
+
+        if (success) {
+            CTransaction ctx = CTransaction(mtx);
+            size_t size = GetVirtualTransactionSize(ctx, GetTransactionSigOpCost(ctx, view, STANDARD_SCRIPT_VERIFY_FLAGS));
+            result.estimated_vsize = size;
+            // Estimate fee rate
+            CFeeRate feerate(fee, size);
+            result.estimated_feerate = feerate;
+        }
+
+        if (only_missing_sigs) {
+            result.next = PSBTRole::SIGNER;
+        } else if (only_missing_final) {
+            result.next = PSBTRole::FINALIZER;
+        } else if (all_final) {
+            result.next = PSBTRole::EXTRACTOR;
+        } else {
+            result.next = PSBTRole::UPDATER;
+        }
+    } else {
+        result.next = PSBTRole::UPDATER;
+    }
+
+    return result;
+}
diff --git a/src/node/psbt.h b/src/node/psbt.h
new file mode 100644
index 0000000000..e04366a20f
--- /dev/null
+++ b/src/node/psbt.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_NODE_PSBT_H
+#define BITCOIN_NODE_PSBT_H
+
+#include <psbt.h>
+
+/**
+ * Holds an analysis of one input from a PSBT
+ */
+struct PSBTInputAnalysis {
+    bool has_utxo; //!< Whether we have UTXO information for this input
+    bool is_final; //!< Whether the input has all required information including signatures
+    PSBTRole next; //!< Which of the BIP 174 roles needs to handle this input next
+
+    std::vector<CKeyID> missing_pubkeys; //!< Pubkeys whose BIP32 derivation path is missing
+    std::vector<CKeyID> missing_sigs;    //!< Pubkeys whose signatures are missing
+    uint160 missing_redeem_script;       //!< Hash160 of redeem script, if missing
+    uint256 missing_witness_script;      //!< SHA256 of witness script, if missing
+};
+
+/**
+ * Holds the results of AnalyzePSBT (miscellaneous information about a PSBT)
+ */
+struct PSBTAnalysis {
+    Optional<size_t> estimated_vsize;      //!< Estimated weight of the transaction
+    Optional<CFeeRate> estimated_feerate;  //!< Estimated feerate (fee / weight) of the transaction
+    Optional<CAmount> fee;                 //!< Amount of fee being paid by the transaction
+    std::vector<PSBTInputAnalysis> inputs; //!< More information about the individual inputs of the transaction
+    PSBTRole next;                         //!< Which of the BIP 174 roles needs to handle the transaction next
+};
+
+/**
+ * Provides helpful miscellaneous information about where a PSBT is in the signing workflow.
+ *
+ * @param[in] psbtx the PSBT to analyze
+ * @return A PSBTAnalysis with information about the provided PSBT.
+ */
+PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx);
+
+#endif // BITCOIN_NODE_PSBT_H
diff --git a/src/node/transaction.cpp b/src/node/transaction.cpp
index 7b9b4310e7..5ffb15ed3c 100644
--- a/src/node/transaction.cpp
+++ b/src/node/transaction.cpp
@@ -6,38 +6,13 @@
 #include <consensus/validation.h>
 #include <net.h>
 #include <txmempool.h>
+#include <util/validation.h>
 #include <validation.h>
 #include <validationinterface.h>
 #include <node/transaction.h>
 
 #include <future>
 
-std::string TransactionErrorString(const TransactionError err)
-{
-    switch (err) {
-        case TransactionError::OK:
-            return "No error";
-        case TransactionError::MISSING_INPUTS:
-            return "Missing inputs";
-        case TransactionError::ALREADY_IN_CHAIN:
-            return "Transaction already in block chain";
-        case TransactionError::P2P_DISABLED:
-            return "Peer-to-peer functionality missing or disabled";
-        case TransactionError::MEMPOOL_REJECTED:
-            return "Transaction rejected by AcceptToMemoryPool";
-        case TransactionError::MEMPOOL_ERROR:
-            return "AcceptToMemoryPool failed";
-        case TransactionError::INVALID_PSBT:
-            return "PSBT is not sane";
-        case TransactionError::PSBT_MISMATCH:
-            return "PSBTs not compatible (different transactions)";
-        case TransactionError::SIGHASH_MISMATCH:
-            return "Specified sighash value does not match existing value";
-        // no default case, so the compiler can warn about missing cases
-    }
-    assert(false);
-}
-
 TransactionError BroadcastTransaction(const CTransactionRef tx, uint256& hashTx, std::string& err_string, const CAmount& highfee)
 {
     std::promise<void> promise;
diff --git a/src/node/transaction.h b/src/node/transaction.h
index 3457ececa4..51033f94e5 100644
--- a/src/node/transaction.h
+++ b/src/node/transaction.h
@@ -8,20 +8,7 @@
 #include <attributes.h>
 #include <primitives/transaction.h>
 #include <uint256.h>
-
-enum class TransactionError {
-    OK, //!< No error
-    MISSING_INPUTS,
-    ALREADY_IN_CHAIN,
-    P2P_DISABLED,
-    MEMPOOL_REJECTED,
-    MEMPOOL_ERROR,
-    INVALID_PSBT,
-    PSBT_MISMATCH,
-    SIGHASH_MISMATCH,
-};
-
-std::string TransactionErrorString(const TransactionError error);
+#include <util/error.h>
 
 /**
  * Broadcast a transaction
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index c49b9fa36b..524afd014e 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -27,40 +27,6 @@ std::string StringForFeeEstimateHorizon(FeeEstimateHorizon horizon) {
     return horizon_string->second;
 }
 
-std::string StringForFeeReason(FeeReason reason) {
-    static const std::map<FeeReason, std::string> fee_reason_strings = {
-        {FeeReason::NONE, "None"},
-        {FeeReason::HALF_ESTIMATE, "Half Target 60% Threshold"},
-        {FeeReason::FULL_ESTIMATE, "Target 85% Threshold"},
-        {FeeReason::DOUBLE_ESTIMATE, "Double Target 95% Threshold"},
-        {FeeReason::CONSERVATIVE, "Conservative Double Target longer horizon"},
-        {FeeReason::MEMPOOL_MIN, "Mempool Min Fee"},
-        {FeeReason::PAYTXFEE, "PayTxFee set"},
-        {FeeReason::FALLBACK, "Fallback fee"},
-        {FeeReason::REQUIRED, "Minimum Required Fee"},
-        {FeeReason::MAXTXFEE, "MaxTxFee limit"}
-    };
-    auto reason_string = fee_reason_strings.find(reason);
-
-    if (reason_string == fee_reason_strings.end()) return "Unknown";
-
-    return reason_string->second;
-}
-
-bool FeeModeFromString(const std::string& mode_string, FeeEstimateMode& fee_estimate_mode) {
-    static const std::map<std::string, FeeEstimateMode> fee_modes = {
-        {"UNSET", FeeEstimateMode::UNSET},
-        {"ECONOMICAL", FeeEstimateMode::ECONOMICAL},
-        {"CONSERVATIVE", FeeEstimateMode::CONSERVATIVE},
-    };
-    auto mode = fee_modes.find(mode_string);
-
-    if (mode == fee_modes.end()) return false;
-
-    fee_estimate_mode = mode->second;
-    return true;
-}
-
 /**
  * We will instantiate an instance of this class to track transactions that were
  * included in a block. We will lump transactions into a bucket according to their
diff --git a/src/policy/fees.h b/src/policy/fees.h
index c8472a12f5..6e61f76178 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -46,8 +46,6 @@ enum class FeeReason {
     MAXTXFEE,
 };
 
-std::string StringForFeeReason(FeeReason reason);
-
 /* Used to determine type of fee estimation requested */
 enum class FeeEstimateMode {
     UNSET,        //!< Use default settings based on other criteria
@@ -55,8 +53,6 @@ enum class FeeEstimateMode {
     CONSERVATIVE, //!< Force estimateSmartFee to use conservative estimates
 };
 
-bool FeeModeFromString(const std::string& mode_string, FeeEstimateMode& fee_estimate_mode);
-
 /* Used to return detailed information about a feerate bucket */
 struct EstimatorBucket
 {
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index d4cc538492..44c23661fb 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -8,8 +8,8 @@
 #include <policy/policy.h>
 
 #include <consensus/validation.h>
-#include <validation.h>
 #include <coins.h>
+#include <policy/settings.h>
 #include <tinyformat.h>
 #include <util/system.h>
 #include <util/strencodings.h>
@@ -239,10 +239,6 @@ bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
     return true;
 }
 
-CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE);
-CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
-unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP;
-
 int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost)
 {
     return (std::max(nWeight, nSigOpCost * nBytesPerSigOp) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
diff --git a/src/policy/policy.h b/src/policy/policy.h
index 3d47ac1267..8660af26de 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -34,6 +34,8 @@ static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
 static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000;
 /** Default for -bytespersigop */
 static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
+/** Default for -permitbaremultisig */
+static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
 /** The maximum number of witness stack items in a standard P2WSH script */
 static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100;
 /** The maximum size of each witness stack item in a standard P2WSH script */
@@ -98,10 +100,6 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
      */
 bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
 
-extern CFeeRate incrementalRelayFee;
-extern CFeeRate dustRelayFee;
-extern unsigned int nBytesPerSigOp;
-
 /** Compute the virtual transaction size (weight reinterpreted as bytes). */
 int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost);
 int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost = 0);
diff --git a/src/policy/rbf.cpp b/src/policy/rbf.cpp
index c73a97fd7d..b4b8341d77 100644
--- a/src/policy/rbf.cpp
+++ b/src/policy/rbf.cpp
@@ -3,16 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <policy/rbf.h>
-
-bool SignalsOptInRBF(const CTransaction &tx)
-{
-    for (const CTxIn &txin : tx.vin) {
-        if (txin.nSequence <= MAX_BIP125_RBF_SEQUENCE) {
-            return true;
-        }
-    }
-    return false;
-}
+#include <util/rbf.h>
 
 RBFTransactionState IsRBFOptIn(const CTransaction& tx, const CTxMemPool& pool)
 {
diff --git a/src/policy/rbf.h b/src/policy/rbf.h
index a4f8777310..0707b0044f 100644
--- a/src/policy/rbf.h
+++ b/src/policy/rbf.h
@@ -7,18 +7,12 @@
 
 #include <txmempool.h>
 
-static const uint32_t MAX_BIP125_RBF_SEQUENCE = 0xfffffffd;
-
 enum class RBFTransactionState {
     UNKNOWN,
     REPLACEABLE_BIP125,
     FINAL
 };
 
-// Check whether the sequence numbers on this transaction are signaling
-// opt-in to replace-by-fee, according to BIP 125
-bool SignalsOptInRBF(const CTransaction &tx);
-
 // Determine whether an in-mempool transaction is signaling opt-in to RBF
 // according to BIP 125
 // This involves checking sequence numbers of the transaction, as well
diff --git a/src/policy/settings.cpp b/src/policy/settings.cpp
new file mode 100644
index 0000000000..e8e1559407
--- /dev/null
+++ b/src/policy/settings.cpp
@@ -0,0 +1,14 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <policy/settings.h>
+
+#include <policy/feerate.h>
+#include <policy/policy.h>
+
+bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
+CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE);
+CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
+unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP;
diff --git a/src/policy/settings.h b/src/policy/settings.h
new file mode 100644
index 0000000000..1d2a1fb880
--- /dev/null
+++ b/src/policy/settings.h
@@ -0,0 +1,17 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_POLICY_SETTINGS_H
+#define BITCOIN_POLICY_SETTINGS_H
+
+class CFeeRate;
+
+// Policy settings which are configurable at runtime.
+extern CFeeRate incrementalRelayFee;
+extern CFeeRate dustRelayFee;
+extern unsigned int nBytesPerSigOp;
+extern bool fIsBareMultisigStd;
+
+#endif // BITCOIN_POLICY_SETTINGS_H
diff --git a/src/psbt.cpp b/src/psbt.cpp
index 184129e330..f31f2af0d1 100644
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -340,129 +340,6 @@ std::string PSBTRoleName(PSBTRole role) {
     }
 }
 
-PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
-{
-    // Go through each input and build status
-    PSBTAnalysis result;
-
-    bool calc_fee = true;
-    bool all_final = true;
-    bool only_missing_sigs = true;
-    bool only_missing_final = false;
-    CAmount in_amt = 0;
-
-    result.inputs.resize(psbtx.tx->vin.size());
-
-    for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
-        PSBTInput& input = psbtx.inputs[i];
-        PSBTInputAnalysis& input_analysis = result.inputs[i];
-
-        // Check for a UTXO
-        CTxOut utxo;
-        if (psbtx.GetInputUTXO(utxo, i)) {
-            in_amt += utxo.nValue;
-            input_analysis.has_utxo = true;
-        } else {
-            input_analysis.has_utxo = false;
-            input_analysis.is_final = false;
-            input_analysis.next = PSBTRole::UPDATER;
-            calc_fee = false;
-        }
-
-        // Check if it is final
-        if (!utxo.IsNull() && !PSBTInputSigned(input)) {
-            input_analysis.is_final = false;
-            all_final = false;
-
-            // Figure out what is missing
-            SignatureData outdata;
-            bool complete = SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, &outdata);
-
-            // Things are missing
-            if (!complete) {
-                input_analysis.missing_pubkeys = outdata.missing_pubkeys;
-                input_analysis.missing_redeem_script = outdata.missing_redeem_script;
-                input_analysis.missing_witness_script = outdata.missing_witness_script;
-                input_analysis.missing_sigs = outdata.missing_sigs;
-
-                // If we are only missing signatures and nothing else, then next is signer
-                if (outdata.missing_pubkeys.empty() && outdata.missing_redeem_script.IsNull() && outdata.missing_witness_script.IsNull() && !outdata.missing_sigs.empty()) {
-                    input_analysis.next = PSBTRole::SIGNER;
-                } else {
-                    only_missing_sigs = false;
-                    input_analysis.next = PSBTRole::UPDATER;
-                }
-            } else {
-                only_missing_final = true;
-                input_analysis.next = PSBTRole::FINALIZER;
-            }
-        } else if (!utxo.IsNull()){
-            input_analysis.is_final = true;
-        }
-    }
-
-    if (all_final) {
-        only_missing_sigs = false;
-        result.next = PSBTRole::EXTRACTOR;
-    }
-    if (calc_fee) {
-        // Get the output amount
-        CAmount out_amt = std::accumulate(psbtx.tx->vout.begin(), psbtx.tx->vout.end(), CAmount(0),
-            [](CAmount a, const CTxOut& b) {
-                return a += b.nValue;
-            }
-        );
-
-        // Get the fee
-        CAmount fee = in_amt - out_amt;
-        result.fee = fee;
-
-        // Estimate the size
-        CMutableTransaction mtx(*psbtx.tx);
-        CCoinsView view_dummy;
-        CCoinsViewCache view(&view_dummy);
-        bool success = true;
-
-        for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
-            PSBTInput& input = psbtx.inputs[i];
-            Coin newcoin;
-
-            if (!SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, nullptr, true) || !psbtx.GetInputUTXO(newcoin.out, i)) {
-                success = false;
-                break;
-            } else {
-                mtx.vin[i].scriptSig = input.final_script_sig;
-                mtx.vin[i].scriptWitness = input.final_script_witness;
-                newcoin.nHeight = 1;
-                view.AddCoin(psbtx.tx->vin[i].prevout, std::move(newcoin), true);
-            }
-        }
-
-        if (success) {
-            CTransaction ctx = CTransaction(mtx);
-            size_t size = GetVirtualTransactionSize(ctx, GetTransactionSigOpCost(ctx, view, STANDARD_SCRIPT_VERIFY_FLAGS));
-            result.estimated_vsize = size;
-            // Estimate fee rate
-            CFeeRate feerate(fee, size);
-            result.estimated_feerate = feerate;
-        }
-
-        if (only_missing_sigs) {
-            result.next = PSBTRole::SIGNER;
-        } else if (only_missing_final) {
-            result.next = PSBTRole::FINALIZER;
-        } else if (all_final) {
-            result.next = PSBTRole::EXTRACTOR;
-        } else {
-            result.next = PSBTRole::UPDATER;
-        }
-    } else {
-        result.next = PSBTRole::UPDATER;
-    }
-
-    return result;
-}
-
 bool DecodeBase64PSBT(PartiallySignedTransaction& psbt, const std::string& base64_tx, std::string& error)
 {
     bool invalid;
diff --git a/src/psbt.h b/src/psbt.h
index fcb3337a53..1bc1e91a84 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -557,31 +557,6 @@ enum class PSBTRole {
     EXTRACTOR
 };
 
-/**
- * Holds an analysis of one input from a PSBT
- */
-struct PSBTInputAnalysis {
-    bool has_utxo; //!< Whether we have UTXO information for this input
-    bool is_final; //!< Whether the input has all required information including signatures
-    PSBTRole next; //!< Which of the BIP 174 roles needs to handle this input next
-
-    std::vector<CKeyID> missing_pubkeys; //!< Pubkeys whose BIP32 derivation path is missing
-    std::vector<CKeyID> missing_sigs;    //!< Pubkeys whose signatures are missing
-    uint160 missing_redeem_script;       //!< Hash160 of redeem script, if missing
-    uint256 missing_witness_script;      //!< SHA256 of witness script, if missing
-};
-
-/**
- * Holds the results of AnalyzePSBT (miscellaneous information about a PSBT)
- */
-struct PSBTAnalysis {
-    Optional<size_t> estimated_vsize;      //!< Estimated weight of the transaction
-    Optional<CFeeRate> estimated_feerate;  //!< Estimated feerate (fee / weight) of the transaction
-    Optional<CAmount> fee;                 //!< Amount of fee being paid by the transaction
-    std::vector<PSBTInputAnalysis> inputs; //!< More information about the individual inputs of the transaction
-    PSBTRole next;                         //!< Which of the BIP 174 roles needs to handle the transaction next
-};
-
 std::string PSBTRoleName(PSBTRole role);
 
 /** Checks whether a PSBTInput is already signed. */
@@ -616,14 +591,6 @@ bool FinalizeAndExtractPSBT(PartiallySignedTransaction& psbtx, CMutableTransacti
  */
 NODISCARD TransactionError CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs);
 
-/**
- * Provides helpful miscellaneous information about where a PSBT is in the signing workflow.
- *
- * @param[in] psbtx the PSBT to analyze
- * @return A PSBTAnalysis with information about the provided PSBT.
- */
-PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx);
-
 //! Decode a base64ed PSBT into a PartiallySignedTransaction
 NODISCARD bool DecodeBase64PSBT(PartiallySignedTransaction& decoded_psbt, const std::string& base64_psbt, std::string& error);
 //! Decode a raw (binary blob) PSBT into a PartiallySignedTransaction
diff --git a/src/qt/signverifymessagedialog.cpp b/src/qt/signverifymessagedialog.cpp
index d37a78fa8c..64cc85d623 100644
--- a/src/qt/signverifymessagedialog.cpp
+++ b/src/qt/signverifymessagedialog.cpp
@@ -11,7 +11,7 @@
 #include <qt/walletmodel.h>
 
 #include <key_io.h>
-#include <validation.h> // For strMessageMagic
+#include <util/validation.h> // For strMessageMagic
 #include <wallet/wallet.h>
 
 #include <string>
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index d35f458b2e..3db24080db 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -29,6 +29,7 @@
 #include <txmempool.h>
 #include <util/strencodings.h>
 #include <util/system.h>
+#include <util/validation.h>
 #include <validation.h>
 #include <validationinterface.h>
 #include <versionbitsinfo.h>
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 480d610235..c636102b20 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -21,8 +21,10 @@
 #include <rpc/util.h>
 #include <shutdown.h>
 #include <txmempool.h>
+#include <util/fees.h>
 #include <util/strencodings.h>
 #include <util/system.h>
+#include <util/validation.h>
 #include <validation.h>
 #include <validationinterface.h>
 #include <versionbitsinfo.h>
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index 0a97f80297..f221847347 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -20,6 +20,7 @@
 #include <timedata.h>
 #include <util/system.h>
 #include <util/strencodings.h>
+#include <util/validation.h>
 #include <warnings.h>
 
 #include <stdint.h>
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index c7b3478f44..e8cdce623c 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -12,6 +12,7 @@
 #include <net_processing.h>
 #include <netbase.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <rpc/protocol.h>
 #include <rpc/util.h>
 #include <sync.h>
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 6ecde84cdb..8d15ecc28e 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -15,12 +15,13 @@
 #include <key_io.h>
 #include <keystore.h>
 #include <merkleblock.h>
+#include <node/psbt.h>
 #include <node/transaction.h>
 #include <policy/policy.h>
 #include <policy/rbf.h>
 #include <primitives/transaction.h>
 #include <psbt.h>
-#include <rpc/rawtransaction.h>
+#include <rpc/rawtransaction_util.h>
 #include <rpc/server.h>
 #include <rpc/util.h>
 #include <script/script.h>
@@ -359,119 +360,6 @@ static UniValue verifytxoutproof(const JSONRPCRequest& request)
     return res;
 }
 
-CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf)
-{
-    if (inputs_in.isNull() || outputs_in.isNull())
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, arguments 1 and 2 must be non-null");
-
-    UniValue inputs = inputs_in.get_array();
-    const bool outputs_is_obj = outputs_in.isObject();
-    UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();
-
-    CMutableTransaction rawTx;
-
-    if (!locktime.isNull()) {
-        int64_t nLockTime = locktime.get_int64();
-        if (nLockTime < 0 || nLockTime > LOCKTIME_MAX)
-            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
-        rawTx.nLockTime = nLockTime;
-    }
-
-    bool rbfOptIn = rbf.isTrue();
-
-    for (unsigned int idx = 0; idx < inputs.size(); idx++) {
-        const UniValue& input = inputs[idx];
-        const UniValue& o = input.get_obj();
-
-        uint256 txid = ParseHashO(o, "txid");
-
-        const UniValue& vout_v = find_value(o, "vout");
-        if (!vout_v.isNum())
-            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");
-        int nOutput = vout_v.get_int();
-        if (nOutput < 0)
-            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive");
-
-        uint32_t nSequence;
-        if (rbfOptIn) {
-            nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
-        } else if (rawTx.nLockTime) {
-            nSequence = CTxIn::SEQUENCE_FINAL - 1;
-        } else {
-            nSequence = CTxIn::SEQUENCE_FINAL;
-        }
-
-        // set the sequence number if passed in the parameters object
-        const UniValue& sequenceObj = find_value(o, "sequence");
-        if (sequenceObj.isNum()) {
-            int64_t seqNr64 = sequenceObj.get_int64();
-            if (seqNr64 < 0 || seqNr64 > CTxIn::SEQUENCE_FINAL) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range");
-            } else {
-                nSequence = (uint32_t)seqNr64;
-            }
-        }
-
-        CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);
-
-        rawTx.vin.push_back(in);
-    }
-
-    if (!outputs_is_obj) {
-        // Translate array of key-value pairs into dict
-        UniValue outputs_dict = UniValue(UniValue::VOBJ);
-        for (size_t i = 0; i < outputs.size(); ++i) {
-            const UniValue& output = outputs[i];
-            if (!output.isObject()) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair not an object as expected");
-            }
-            if (output.size() != 1) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair must contain exactly one key");
-            }
-            outputs_dict.pushKVs(output);
-        }
-        outputs = std::move(outputs_dict);
-    }
-
-    // Duplicate checking
-    std::set<CTxDestination> destinations;
-    bool has_data{false};
-
-    for (const std::string& name_ : outputs.getKeys()) {
-        if (name_ == "data") {
-            if (has_data) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, duplicate key: data");
-            }
-            has_data = true;
-            std::vector<unsigned char> data = ParseHexV(outputs[name_].getValStr(), "Data");
-
-            CTxOut out(0, CScript() << OP_RETURN << data);
-            rawTx.vout.push_back(out);
-        } else {
-            CTxDestination destination = DecodeDestination(name_);
-            if (!IsValidDestination(destination)) {
-                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
-            }
-
-            if (!destinations.insert(destination).second) {
-                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
-            }
-
-            CScript scriptPubKey = GetScriptForDestination(destination);
-            CAmount nAmount = AmountFromValue(outputs[name_]);
-
-            CTxOut out(nAmount, scriptPubKey);
-            rawTx.vout.push_back(out);
-        }
-    }
-
-    if (!rbf.isNull() && rawTx.vin.size() > 0 && rbfOptIn != SignalsOptInRBF(CTransaction(rawTx))) {
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
-    }
-
-    return rawTx;
-}
-
 static UniValue createrawtransaction(const JSONRPCRequest& request)
 {
     if (request.fHelp || request.params.size() < 2 || request.params.size() > 4) {
@@ -717,23 +605,6 @@ static UniValue decodescript(const JSONRPCRequest& request)
     return r;
 }
 
-/** Pushes a JSON object for script verification or signing errors to vErrorsRet. */
-static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::string& strMessage)
-{
-    UniValue entry(UniValue::VOBJ);
-    entry.pushKV("txid", txin.prevout.hash.ToString());
-    entry.pushKV("vout", (uint64_t)txin.prevout.n);
-    UniValue witness(UniValue::VARR);
-    for (unsigned int i = 0; i < txin.scriptWitness.stack.size(); i++) {
-        witness.push_back(HexStr(txin.scriptWitness.stack[i].begin(), txin.scriptWitness.stack[i].end()));
-    }
-    entry.pushKV("witness", witness);
-    entry.pushKV("scriptSig", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
-    entry.pushKV("sequence", (uint64_t)txin.nSequence);
-    entry.pushKV("error", strMessage);
-    vErrorsRet.push_back(entry);
-}
-
 static UniValue combinerawtransaction(const JSONRPCRequest& request)
 {
     if (request.fHelp || request.params.size() != 1)
@@ -818,152 +689,6 @@ static UniValue combinerawtransaction(const JSONRPCRequest& request)
     return EncodeHexTx(CTransaction(mergedTx));
 }
 
-// TODO(https://github.com/bitcoin/bitcoin/pull/10973#discussion_r267084237):
-// This function is called from both wallet and node rpcs
-// (signrawtransactionwithwallet and signrawtransactionwithkey). It should be
-// moved to a util file so wallet code doesn't need to link against node code.
-// Also the dependency on interfaces::Chain should be removed, so
-// signrawtransactionwithkey doesn't need access to a Chain instance.
-UniValue SignTransaction(interfaces::Chain& chain, CMutableTransaction& mtx, const UniValue& prevTxsUnival, CBasicKeyStore *keystore, bool is_temp_keystore, const UniValue& hashType)
-{
-    // Fetch previous transactions (inputs):
-    std::map<COutPoint, Coin> coins;
-    for (const CTxIn& txin : mtx.vin) {
-        coins[txin.prevout]; // Create empty map entry keyed by prevout.
-    }
-    chain.findCoins(coins);
-
-    // Add previous txouts given in the RPC call:
-    if (!prevTxsUnival.isNull()) {
-        UniValue prevTxs = prevTxsUnival.get_array();
-        for (unsigned int idx = 0; idx < prevTxs.size(); ++idx) {
-            const UniValue& p = prevTxs[idx];
-            if (!p.isObject()) {
-                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
-            }
-
-            UniValue prevOut = p.get_obj();
-
-            RPCTypeCheckObj(prevOut,
-                {
-                    {"txid", UniValueType(UniValue::VSTR)},
-                    {"vout", UniValueType(UniValue::VNUM)},
-                    {"scriptPubKey", UniValueType(UniValue::VSTR)},
-                });
-
-            uint256 txid = ParseHashO(prevOut, "txid");
-
-            int nOut = find_value(prevOut, "vout").get_int();
-            if (nOut < 0) {
-                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "vout must be positive");
-            }
-
-            COutPoint out(txid, nOut);
-            std::vector<unsigned char> pkData(ParseHexO(prevOut, "scriptPubKey"));
-            CScript scriptPubKey(pkData.begin(), pkData.end());
-
-            {
-                auto coin = coins.find(out);
-                if (coin != coins.end() && !coin->second.IsSpent() && coin->second.out.scriptPubKey != scriptPubKey) {
-                    std::string err("Previous output scriptPubKey mismatch:\n");
-                    err = err + ScriptToAsmStr(coin->second.out.scriptPubKey) + "\nvs:\n"+
-                        ScriptToAsmStr(scriptPubKey);
-                    throw JSONRPCError(RPC_DESERIALIZATION_ERROR, err);
-                }
-                Coin newcoin;
-                newcoin.out.scriptPubKey = scriptPubKey;
-                newcoin.out.nValue = MAX_MONEY;
-                if (prevOut.exists("amount")) {
-                    newcoin.out.nValue = AmountFromValue(find_value(prevOut, "amount"));
-                }
-                newcoin.nHeight = 1;
-                coins[out] = std::move(newcoin);
-            }
-
-            // if redeemScript and private keys were given, add redeemScript to the keystore so it can be signed
-            if (is_temp_keystore && (scriptPubKey.IsPayToScriptHash() || scriptPubKey.IsPayToWitnessScriptHash())) {
-                RPCTypeCheckObj(prevOut,
-                    {
-                        {"redeemScript", UniValueType(UniValue::VSTR)},
-                        {"witnessScript", UniValueType(UniValue::VSTR)},
-                    }, true);
-                UniValue rs = find_value(prevOut, "redeemScript");
-                if (!rs.isNull()) {
-                    std::vector<unsigned char> rsData(ParseHexV(rs, "redeemScript"));
-                    CScript redeemScript(rsData.begin(), rsData.end());
-                    keystore->AddCScript(redeemScript);
-                    // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
-                    // This is only for compatibility, it is encouraged to use the explicit witnessScript field instead.
-                    keystore->AddCScript(GetScriptForWitness(redeemScript));
-                }
-                UniValue ws = find_value(prevOut, "witnessScript");
-                if (!ws.isNull()) {
-                    std::vector<unsigned char> wsData(ParseHexV(ws, "witnessScript"));
-                    CScript witnessScript(wsData.begin(), wsData.end());
-                    keystore->AddCScript(witnessScript);
-                    // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
-                    keystore->AddCScript(GetScriptForWitness(witnessScript));
-                }
-            }
-        }
-    }
-
-    int nHashType = ParseSighashString(hashType);
-
-    bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
-
-    // Script verification errors
-    UniValue vErrors(UniValue::VARR);
-
-    // Use CTransaction for the constant parts of the
-    // transaction to avoid rehashing.
-    const CTransaction txConst(mtx);
-    // Sign what we can:
-    for (unsigned int i = 0; i < mtx.vin.size(); i++) {
-        CTxIn& txin = mtx.vin[i];
-        auto coin = coins.find(txin.prevout);
-        if (coin == coins.end() || coin->second.IsSpent()) {
-            TxInErrorToJSON(txin, vErrors, "Input not found or already spent");
-            continue;
-        }
-        const CScript& prevPubKey = coin->second.out.scriptPubKey;
-        const CAmount& amount = coin->second.out.nValue;
-
-        SignatureData sigdata = DataFromTransaction(mtx, i, coin->second.out);
-        // Only sign SIGHASH_SINGLE if there's a corresponding output:
-        if (!fHashSingle || (i < mtx.vout.size())) {
-            ProduceSignature(*keystore, MutableTransactionSignatureCreator(&mtx, i, amount, nHashType), prevPubKey, sigdata);
-        }
-
-        UpdateInput(txin, sigdata);
-
-        // amount must be specified for valid segwit signature
-        if (amount == MAX_MONEY && !txin.scriptWitness.IsNull()) {
-            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coin->second.out.ToString()));
-        }
-
-        ScriptError serror = SCRIPT_ERR_OK;
-        if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) {
-            if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
-                // Unable to sign input and verification failed (possible attempt to partially sign).
-                TxInErrorToJSON(txin, vErrors, "Unable to sign input, invalid stack size (possibly missing key)");
-            } else {
-                TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
-            }
-        }
-    }
-    bool fComplete = vErrors.empty();
-
-    UniValue result(UniValue::VOBJ);
-    result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
-    result.pushKV("complete", fComplete);
-    if (!vErrors.empty()) {
-        result.pushKV("errors", vErrors);
-    }
-
-    return result;
-}
-
 static UniValue signrawtransactionwithkey(const JSONRPCRequest& request)
 {
     if (request.fHelp || request.params.size() < 2 || request.params.size() > 4)
diff --git a/src/rpc/rawtransaction_util.cpp b/src/rpc/rawtransaction_util.cpp
new file mode 100644
index 0000000000..728fc62e25
--- /dev/null
+++ b/src/rpc/rawtransaction_util.cpp
@@ -0,0 +1,293 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <rpc/rawtransaction_util.h>
+
+#include <coins.h>
+#include <core_io.h>
+#include <interfaces/chain.h>
+#include <key_io.h>
+#include <keystore.h>
+#include <policy/policy.h>
+#include <primitives/transaction.h>
+#include <rpc/protocol.h>
+#include <rpc/util.h>
+#include <tinyformat.h>
+#include <univalue.h>
+#include <util/rbf.h>
+#include <util/strencodings.h>
+
+CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf)
+{
+    if (inputs_in.isNull() || outputs_in.isNull())
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, arguments 1 and 2 must be non-null");
+
+    UniValue inputs = inputs_in.get_array();
+    const bool outputs_is_obj = outputs_in.isObject();
+    UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();
+
+    CMutableTransaction rawTx;
+
+    if (!locktime.isNull()) {
+        int64_t nLockTime = locktime.get_int64();
+        if (nLockTime < 0 || nLockTime > LOCKTIME_MAX)
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
+        rawTx.nLockTime = nLockTime;
+    }
+
+    bool rbfOptIn = rbf.isTrue();
+
+    for (unsigned int idx = 0; idx < inputs.size(); idx++) {
+        const UniValue& input = inputs[idx];
+        const UniValue& o = input.get_obj();
+
+        uint256 txid = ParseHashO(o, "txid");
+
+        const UniValue& vout_v = find_value(o, "vout");
+        if (!vout_v.isNum())
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");
+        int nOutput = vout_v.get_int();
+        if (nOutput < 0)
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive");
+
+        uint32_t nSequence;
+        if (rbfOptIn) {
+            nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
+        } else if (rawTx.nLockTime) {
+            nSequence = CTxIn::SEQUENCE_FINAL - 1;
+        } else {
+            nSequence = CTxIn::SEQUENCE_FINAL;
+        }
+
+        // set the sequence number if passed in the parameters object
+        const UniValue& sequenceObj = find_value(o, "sequence");
+        if (sequenceObj.isNum()) {
+            int64_t seqNr64 = sequenceObj.get_int64();
+            if (seqNr64 < 0 || seqNr64 > CTxIn::SEQUENCE_FINAL) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range");
+            } else {
+                nSequence = (uint32_t)seqNr64;
+            }
+        }
+
+        CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);
+
+        rawTx.vin.push_back(in);
+    }
+
+    if (!outputs_is_obj) {
+        // Translate array of key-value pairs into dict
+        UniValue outputs_dict = UniValue(UniValue::VOBJ);
+        for (size_t i = 0; i < outputs.size(); ++i) {
+            const UniValue& output = outputs[i];
+            if (!output.isObject()) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair not an object as expected");
+            }
+            if (output.size() != 1) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair must contain exactly one key");
+            }
+            outputs_dict.pushKVs(output);
+        }
+        outputs = std::move(outputs_dict);
+    }
+
+    // Duplicate checking
+    std::set<CTxDestination> destinations;
+    bool has_data{false};
+
+    for (const std::string& name_ : outputs.getKeys()) {
+        if (name_ == "data") {
+            if (has_data) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, duplicate key: data");
+            }
+            has_data = true;
+            std::vector<unsigned char> data = ParseHexV(outputs[name_].getValStr(), "Data");
+
+            CTxOut out(0, CScript() << OP_RETURN << data);
+            rawTx.vout.push_back(out);
+        } else {
+            CTxDestination destination = DecodeDestination(name_);
+            if (!IsValidDestination(destination)) {
+                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
+            }
+
+            if (!destinations.insert(destination).second) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
+            }
+
+            CScript scriptPubKey = GetScriptForDestination(destination);
+            CAmount nAmount = AmountFromValue(outputs[name_]);
+
+            CTxOut out(nAmount, scriptPubKey);
+            rawTx.vout.push_back(out);
+        }
+    }
+
+    if (!rbf.isNull() && rawTx.vin.size() > 0 && rbfOptIn != SignalsOptInRBF(CTransaction(rawTx))) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
+    }
+
+    return rawTx;
+}
+
+/** Pushes a JSON object for script verification or signing errors to vErrorsRet. */
+static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::string& strMessage)
+{
+    UniValue entry(UniValue::VOBJ);
+    entry.pushKV("txid", txin.prevout.hash.ToString());
+    entry.pushKV("vout", (uint64_t)txin.prevout.n);
+    UniValue witness(UniValue::VARR);
+    for (unsigned int i = 0; i < txin.scriptWitness.stack.size(); i++) {
+        witness.push_back(HexStr(txin.scriptWitness.stack[i].begin(), txin.scriptWitness.stack[i].end()));
+    }
+    entry.pushKV("witness", witness);
+    entry.pushKV("scriptSig", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
+    entry.pushKV("sequence", (uint64_t)txin.nSequence);
+    entry.pushKV("error", strMessage);
+    vErrorsRet.push_back(entry);
+}
+
+// TODO(https://github.com/bitcoin/bitcoin/pull/10973#discussion_r267084237):
+// The dependency on interfaces::Chain should be removed, so
+// signrawtransactionwithkey doesn't need access to a Chain instance.
+UniValue SignTransaction(interfaces::Chain& chain, CMutableTransaction& mtx, const UniValue& prevTxsUnival, CBasicKeyStore *keystore, bool is_temp_keystore, const UniValue& hashType)
+{
+    // Fetch previous transactions (inputs):
+    std::map<COutPoint, Coin> coins;
+    for (const CTxIn& txin : mtx.vin) {
+        coins[txin.prevout]; // Create empty map entry keyed by prevout.
+    }
+    chain.findCoins(coins);
+
+    // Add previous txouts given in the RPC call:
+    if (!prevTxsUnival.isNull()) {
+        UniValue prevTxs = prevTxsUnival.get_array();
+        for (unsigned int idx = 0; idx < prevTxs.size(); ++idx) {
+            const UniValue& p = prevTxs[idx];
+            if (!p.isObject()) {
+                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
+            }
+
+            UniValue prevOut = p.get_obj();
+
+            RPCTypeCheckObj(prevOut,
+                {
+                    {"txid", UniValueType(UniValue::VSTR)},
+                    {"vout", UniValueType(UniValue::VNUM)},
+                    {"scriptPubKey", UniValueType(UniValue::VSTR)},
+                });
+
+            uint256 txid = ParseHashO(prevOut, "txid");
+
+            int nOut = find_value(prevOut, "vout").get_int();
+            if (nOut < 0) {
+                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "vout must be positive");
+            }
+
+            COutPoint out(txid, nOut);
+            std::vector<unsigned char> pkData(ParseHexO(prevOut, "scriptPubKey"));
+            CScript scriptPubKey(pkData.begin(), pkData.end());
+
+            {
+                auto coin = coins.find(out);
+                if (coin != coins.end() && !coin->second.IsSpent() && coin->second.out.scriptPubKey != scriptPubKey) {
+                    std::string err("Previous output scriptPubKey mismatch:\n");
+                    err = err + ScriptToAsmStr(coin->second.out.scriptPubKey) + "\nvs:\n"+
+                        ScriptToAsmStr(scriptPubKey);
+                    throw JSONRPCError(RPC_DESERIALIZATION_ERROR, err);
+                }
+                Coin newcoin;
+                newcoin.out.scriptPubKey = scriptPubKey;
+                newcoin.out.nValue = MAX_MONEY;
+                if (prevOut.exists("amount")) {
+                    newcoin.out.nValue = AmountFromValue(find_value(prevOut, "amount"));
+                }
+                newcoin.nHeight = 1;
+                coins[out] = std::move(newcoin);
+            }
+
+            // if redeemScript and private keys were given, add redeemScript to the keystore so it can be signed
+            if (is_temp_keystore && (scriptPubKey.IsPayToScriptHash() || scriptPubKey.IsPayToWitnessScriptHash())) {
+                RPCTypeCheckObj(prevOut,
+                    {
+                        {"redeemScript", UniValueType(UniValue::VSTR)},
+                        {"witnessScript", UniValueType(UniValue::VSTR)},
+                    }, true);
+                UniValue rs = find_value(prevOut, "redeemScript");
+                if (!rs.isNull()) {
+                    std::vector<unsigned char> rsData(ParseHexV(rs, "redeemScript"));
+                    CScript redeemScript(rsData.begin(), rsData.end());
+                    keystore->AddCScript(redeemScript);
+                    // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
+                    // This is only for compatibility, it is encouraged to use the explicit witnessScript field instead.
+                    keystore->AddCScript(GetScriptForWitness(redeemScript));
+                }
+                UniValue ws = find_value(prevOut, "witnessScript");
+                if (!ws.isNull()) {
+                    std::vector<unsigned char> wsData(ParseHexV(ws, "witnessScript"));
+                    CScript witnessScript(wsData.begin(), wsData.end());
+                    keystore->AddCScript(witnessScript);
+                    // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
+                    keystore->AddCScript(GetScriptForWitness(witnessScript));
+                }
+            }
+        }
+    }
+
+    int nHashType = ParseSighashString(hashType);
+
+    bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
+
+    // Script verification errors
+    UniValue vErrors(UniValue::VARR);
+
+    // Use CTransaction for the constant parts of the
+    // transaction to avoid rehashing.
+    const CTransaction txConst(mtx);
+    // Sign what we can:
+    for (unsigned int i = 0; i < mtx.vin.size(); i++) {
+        CTxIn& txin = mtx.vin[i];
+        auto coin = coins.find(txin.prevout);
+        if (coin == coins.end() || coin->second.IsSpent()) {
+            TxInErrorToJSON(txin, vErrors, "Input not found or already spent");
+            continue;
+        }
+        const CScript& prevPubKey = coin->second.out.scriptPubKey;
+        const CAmount& amount = coin->second.out.nValue;
+
+        SignatureData sigdata = DataFromTransaction(mtx, i, coin->second.out);
+        // Only sign SIGHASH_SINGLE if there's a corresponding output:
+        if (!fHashSingle || (i < mtx.vout.size())) {
+            ProduceSignature(*keystore, MutableTransactionSignatureCreator(&mtx, i, amount, nHashType), prevPubKey, sigdata);
+        }
+
+        UpdateInput(txin, sigdata);
+
+        // amount must be specified for valid segwit signature
+        if (amount == MAX_MONEY && !txin.scriptWitness.IsNull()) {
+            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coin->second.out.ToString()));
+        }
+
+        ScriptError serror = SCRIPT_ERR_OK;
+        if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) {
+            if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
+                // Unable to sign input and verification failed (possible attempt to partially sign).
+                TxInErrorToJSON(txin, vErrors, "Unable to sign input, invalid stack size (possibly missing key)");
+            } else {
+                TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
+            }
+        }
+    }
+    bool fComplete = vErrors.empty();
+
+    UniValue result(UniValue::VOBJ);
+    result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
+    result.pushKV("complete", fComplete);
+    if (!vErrors.empty()) {
+        result.pushKV("errors", vErrors);
+    }
+
+    return result;
+}
diff --git a/src/rpc/rawtransaction.h b/src/rpc/rawtransaction_util.h
index 52d701d1c3..5529dedbd4 100644
--- a/src/rpc/rawtransaction.h
+++ b/src/rpc/rawtransaction_util.h
@@ -2,12 +2,12 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_RPC_RAWTRANSACTION_H
-#define BITCOIN_RPC_RAWTRANSACTION_H
+#ifndef BITCOIN_RPC_RAWTRANSACTION_UTIL_H
+#define BITCOIN_RPC_RAWTRANSACTION_UTIL_H
 
 class CBasicKeyStore;
-struct CMutableTransaction;
 class UniValue;
+struct CMutableTransaction;
 
 namespace interfaces {
 class Chain;
@@ -19,4 +19,4 @@ UniValue SignTransaction(interfaces::Chain& chain, CMutableTransaction& mtx, con
 /** Create a transaction from univalue parameters */
 CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf);
 
-#endif // BITCOIN_RPC_RAWTRANSACTION_H
+#endif // BITCOIN_RPC_RAWTRANSACTION_UTIL_H
diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 276db453cb..9df4070cbb 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -77,99 +77,6 @@ void RPCServer::OnStopped(std::function<void ()> slot)
     g_rpcSignals.Stopped.connect(slot);
 }
 
-void RPCTypeCheck(const UniValue& params,
-                  const std::list<UniValueType>& typesExpected,
-                  bool fAllowNull)
-{
-    unsigned int i = 0;
-    for (const UniValueType& t : typesExpected) {
-        if (params.size() <= i)
-            break;
-
-        const UniValue& v = params[i];
-        if (!(fAllowNull && v.isNull())) {
-            RPCTypeCheckArgument(v, t);
-        }
-        i++;
-    }
-}
-
-void RPCTypeCheckArgument(const UniValue& value, const UniValueType& typeExpected)
-{
-    if (!typeExpected.typeAny && value.type() != typeExpected.type) {
-        throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Expected type %s, got %s", uvTypeName(typeExpected.type), uvTypeName(value.type())));
-    }
-}
-
-void RPCTypeCheckObj(const UniValue& o,
-    const std::map<std::string, UniValueType>& typesExpected,
-    bool fAllowNull,
-    bool fStrict)
-{
-    for (const auto& t : typesExpected) {
-        const UniValue& v = find_value(o, t.first);
-        if (!fAllowNull && v.isNull())
-            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing %s", t.first));
-
-        if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull()))) {
-            std::string err = strprintf("Expected type %s for %s, got %s",
-                uvTypeName(t.second.type), t.first, uvTypeName(v.type()));
-            throw JSONRPCError(RPC_TYPE_ERROR, err);
-        }
-    }
-
-    if (fStrict)
-    {
-        for (const std::string& k : o.getKeys())
-        {
-            if (typesExpected.count(k) == 0)
-            {
-                std::string err = strprintf("Unexpected key %s", k);
-                throw JSONRPCError(RPC_TYPE_ERROR, err);
-            }
-        }
-    }
-}
-
-CAmount AmountFromValue(const UniValue& value)
-{
-    if (!value.isNum() && !value.isStr())
-        throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
-    CAmount amount;
-    if (!ParseFixedPoint(value.getValStr(), 8, &amount))
-        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
-    if (!MoneyRange(amount))
-        throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
-    return amount;
-}
-
-uint256 ParseHashV(const UniValue& v, std::string strName)
-{
-    std::string strHex(v.get_str());
-    if (64 != strHex.length())
-        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%s must be of length %d (not %d, for '%s')", strName, 64, strHex.length(), strHex));
-    if (!IsHex(strHex)) // Note: IsHex("") is false
-        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
-    return uint256S(strHex);
-}
-uint256 ParseHashO(const UniValue& o, std::string strKey)
-{
-    return ParseHashV(find_value(o, strKey), strKey);
-}
-std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName)
-{
-    std::string strHex;
-    if (v.isStr())
-        strHex = v.get_str();
-    if (!IsHex(strHex))
-        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
-    return ParseHex(strHex);
-}
-std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey)
-{
-    return ParseHexV(find_value(o, strKey), strKey);
-}
-
 std::string CRPCTable::help(const std::string& strCommand, const JSONRPCRequest& helpreq) const
 {
     std::string strRet;
@@ -593,17 +500,6 @@ std::vector<std::string> CRPCTable::listCommands() const
     return commandList;
 }
 
-std::string HelpExampleCli(const std::string& methodname, const std::string& args)
-{
-    return "> bitcoin-cli " + methodname + " " + args + "\n";
-}
-
-std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
-{
-    return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", "
-        "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
-}
-
 void RPCSetTimerInterfaceIfUnset(RPCTimerInterface *iface)
 {
     if (!timerInterface)
diff --git a/src/rpc/server.h b/src/rpc/server.h
index e2a85887ba..431ff0bb7c 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -27,15 +27,6 @@ namespace RPCServer
     void OnStopped(std::function<void ()> slot);
 }
 
-/** Wrapper for UniValue::VType, which includes typeAny:
- * Used to denote don't care type. */
-struct UniValueType {
-    UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
-    UniValueType() : typeAny(true) {}
-    bool typeAny;
-    UniValue::VType type;
-};
-
 class JSONRPCRequest
 {
 public:
@@ -65,26 +56,6 @@ void SetRPCWarmupFinished();
 /* returns the current warmup state.  */
 bool RPCIsInWarmup(std::string *outStatus);
 
-/**
- * Type-check arguments; throws JSONRPCError if wrong type given. Does not check that
- * the right number of arguments are passed, just that any passed are the correct type.
- */
-void RPCTypeCheck(const UniValue& params,
-                  const std::list<UniValueType>& typesExpected, bool fAllowNull=false);
-
-/**
- * Type-check one argument; throws JSONRPCError if wrong type given.
- */
-void RPCTypeCheckArgument(const UniValue& value, const UniValueType& typeExpected);
-
-/*
-  Check for expected keys/value types in an Object.
-*/
-void RPCTypeCheckObj(const UniValue& o,
-    const std::map<std::string, UniValueType>& typesExpected,
-    bool fAllowNull = false,
-    bool fStrict = false);
-
 /** Opaque base class for timers returned by NewTimerFunc.
  * This provides no methods at the moment, but makes sure that delete
  * cleans up the whole state.
@@ -204,19 +175,6 @@ bool IsDeprecatedRPCEnabled(const std::string& method);
 
 extern CRPCTable tableRPC;
 
-/**
- * Utilities: convert hex-encoded Values
- * (throws error if not hex).
- */
-extern uint256 ParseHashV(const UniValue& v, std::string strName);
-extern uint256 ParseHashO(const UniValue& o, std::string strKey);
-extern std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName);
-extern std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey);
-
-extern CAmount AmountFromValue(const UniValue& value);
-extern std::string HelpExampleCli(const std::string& methodname, const std::string& args);
-extern std::string HelpExampleRpc(const std::string& methodname, const std::string& args);
-
 void StartRPC();
 void InterruptRPC();
 void StopRPC();
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 4cd63fada6..1a87c9f935 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -10,6 +10,110 @@
 
 InitInterfaces* g_rpc_interfaces = nullptr;
 
+void RPCTypeCheck(const UniValue& params,
+                  const std::list<UniValueType>& typesExpected,
+                  bool fAllowNull)
+{
+    unsigned int i = 0;
+    for (const UniValueType& t : typesExpected) {
+        if (params.size() <= i)
+            break;
+
+        const UniValue& v = params[i];
+        if (!(fAllowNull && v.isNull())) {
+            RPCTypeCheckArgument(v, t);
+        }
+        i++;
+    }
+}
+
+void RPCTypeCheckArgument(const UniValue& value, const UniValueType& typeExpected)
+{
+    if (!typeExpected.typeAny && value.type() != typeExpected.type) {
+        throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Expected type %s, got %s", uvTypeName(typeExpected.type), uvTypeName(value.type())));
+    }
+}
+
+void RPCTypeCheckObj(const UniValue& o,
+    const std::map<std::string, UniValueType>& typesExpected,
+    bool fAllowNull,
+    bool fStrict)
+{
+    for (const auto& t : typesExpected) {
+        const UniValue& v = find_value(o, t.first);
+        if (!fAllowNull && v.isNull())
+            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing %s", t.first));
+
+        if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull()))) {
+            std::string err = strprintf("Expected type %s for %s, got %s",
+                uvTypeName(t.second.type), t.first, uvTypeName(v.type()));
+            throw JSONRPCError(RPC_TYPE_ERROR, err);
+        }
+    }
+
+    if (fStrict)
+    {
+        for (const std::string& k : o.getKeys())
+        {
+            if (typesExpected.count(k) == 0)
+            {
+                std::string err = strprintf("Unexpected key %s", k);
+                throw JSONRPCError(RPC_TYPE_ERROR, err);
+            }
+        }
+    }
+}
+
+CAmount AmountFromValue(const UniValue& value)
+{
+    if (!value.isNum() && !value.isStr())
+        throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
+    CAmount amount;
+    if (!ParseFixedPoint(value.getValStr(), 8, &amount))
+        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
+    if (!MoneyRange(amount))
+        throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
+    return amount;
+}
+
+uint256 ParseHashV(const UniValue& v, std::string strName)
+{
+    std::string strHex(v.get_str());
+    if (64 != strHex.length())
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%s must be of length %d (not %d, for '%s')", strName, 64, strHex.length(), strHex));
+    if (!IsHex(strHex)) // Note: IsHex("") is false
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
+    return uint256S(strHex);
+}
+uint256 ParseHashO(const UniValue& o, std::string strKey)
+{
+    return ParseHashV(find_value(o, strKey), strKey);
+}
+std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName)
+{
+    std::string strHex;
+    if (v.isStr())
+        strHex = v.get_str();
+    if (!IsHex(strHex))
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
+    return ParseHex(strHex);
+}
+std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey)
+{
+    return ParseHexV(find_value(o, strKey), strKey);
+}
+
+std::string HelpExampleCli(const std::string& methodname, const std::string& args)
+{
+    return "> bitcoin-cli " + methodname + " " + args + "\n";
+}
+
+std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
+{
+    return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", "
+        "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
+}
+
 // Converts a hex string to a public key if possible
 CPubKey HexToPubKey(const std::string& hex_in)
 {
diff --git a/src/rpc/util.h b/src/rpc/util.h
index e4cc1fde44..b5b5789253 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -26,6 +26,48 @@ struct InitInterfaces;
 //! state to RPC method implementations.
 extern InitInterfaces* g_rpc_interfaces;
 
+/** Wrapper for UniValue::VType, which includes typeAny:
+ * Used to denote don't care type. */
+struct UniValueType {
+    UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
+    UniValueType() : typeAny(true) {}
+    bool typeAny;
+    UniValue::VType type;
+};
+
+/**
+ * Type-check arguments; throws JSONRPCError if wrong type given. Does not check that
+ * the right number of arguments are passed, just that any passed are the correct type.
+ */
+void RPCTypeCheck(const UniValue& params,
+                  const std::list<UniValueType>& typesExpected, bool fAllowNull=false);
+
+/**
+ * Type-check one argument; throws JSONRPCError if wrong type given.
+ */
+void RPCTypeCheckArgument(const UniValue& value, const UniValueType& typeExpected);
+
+/*
+  Check for expected keys/value types in an Object.
+*/
+void RPCTypeCheckObj(const UniValue& o,
+    const std::map<std::string, UniValueType>& typesExpected,
+    bool fAllowNull = false,
+    bool fStrict = false);
+
+/**
+ * Utilities: convert hex-encoded Values
+ * (throws error if not hex).
+ */
+extern uint256 ParseHashV(const UniValue& v, std::string strName);
+extern uint256 ParseHashO(const UniValue& o, std::string strKey);
+extern std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName);
+extern std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey);
+
+extern CAmount AmountFromValue(const UniValue& value);
+extern std::string HelpExampleCli(const std::string& methodname, const std::string& args);
+extern std::string HelpExampleRpc(const std::string& methodname, const std::string& args);
+
 CPubKey HexToPubKey(const std::string& hex_in);
 CPubKey AddrToPubKey(CKeyStore* const keystore, const std::string& addr_in);
 CScript CreateMultisigRedeemscript(const int required, const std::vector<CPubKey>& pubkeys);
diff --git a/src/test/script_p2sh_tests.cpp b/src/test/script_p2sh_tests.cpp
index 3a2a11ef98..400c89726f 100644
--- a/src/test/script_p2sh_tests.cpp
+++ b/src/test/script_p2sh_tests.cpp
@@ -10,6 +10,7 @@
 #include <policy/policy.h>
 #include <script/script.h>
 #include <script/script_error.h>
+#include <policy/settings.h>
 #include <script/sign.h>
 #include <script/ismine.h>
 #include <test/test_bitcoin.h>
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index 87c3e74df0..b964c6e479 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -13,7 +13,7 @@
 #include <util/system.h>
 #include <util/strencodings.h>
 #include <test/test_bitcoin.h>
-#include <rpc/server.h>
+#include <rpc/util.h>
 
 #if defined(HAVE_CONSENSUS_LIB)
 #include <script/bitcoinconsensus.h>
diff --git a/src/test/sighash_tests.cpp b/src/test/sighash_tests.cpp
index 04d5462acb..07f4337221 100644
--- a/src/test/sighash_tests.cpp
+++ b/src/test/sighash_tests.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <consensus/tx_verify.h>
+#include <consensus/tx_check.h>
 #include <consensus/validation.h>
 #include <test/data/sighash.json.h>
 #include <hash.h>
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index cdfd4db589..b72f156646 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -19,6 +19,7 @@
 #include <script/sigcache.h>
 #include <streams.h>
 #include <ui_interface.h>
+#include <util/validation.h>
 #include <validation.h>
 
 const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 39cff3f463..ed77b7f52b 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -8,13 +8,14 @@
 
 #include <clientversion.h>
 #include <checkqueue.h>
-#include <consensus/tx_verify.h>
+#include <consensus/tx_check.h>
 #include <consensus/validation.h>
 #include <core_io.h>
 #include <key.h>
 #include <keystore.h>
 #include <validation.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <script/script.h>
 #include <script/sign.h>
 #include <script/script_error.h>
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index ca556bdc7b..daac24cc40 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -11,6 +11,7 @@
 #include <validation.h>
 #include <policy/policy.h>
 #include <policy/fees.h>
+#include <policy/settings.h>
 #include <reverse_iterator.h>
 #include <streams.h>
 #include <timedata.h>
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
index 16ab24686b..c084c4e0e2 100644
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -69,13 +69,3 @@ void InitWarning(const std::string& str)
 {
     uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_WARNING);
 }
-
-std::string AmountHighWarn(const std::string& optname)
-{
-    return strprintf(_("%s is set very high!"), optname);
-}
-
-std::string AmountErrMsg(const char* const optname, const std::string& strValue)
-{
-    return strprintf(_("Invalid amount for -%s=<amount>: '%s'"), optname, strValue);
-}
diff --git a/src/ui_interface.h b/src/ui_interface.h
index f1aebce3bb..60d85bc142 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -129,10 +129,6 @@ void InitWarning(const std::string& str);
 /** Show error message **/
 bool InitError(const std::string& str);
 
-std::string AmountHighWarn(const std::string& optname);
-
-std::string AmountErrMsg(const char* const optname, const std::string& strValue);
-
 extern CClientUIInterface uiInterface;
 
 #endif // BITCOIN_UI_INTERFACE_H
diff --git a/src/util/error.cpp b/src/util/error.cpp
new file mode 100644
index 0000000000..68ffd8b046
--- /dev/null
+++ b/src/util/error.cpp
@@ -0,0 +1,43 @@
+// Copyright (c) 2010-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/error.h>
+
+#include <util/system.h>
+
+std::string TransactionErrorString(const TransactionError err)
+{
+    switch (err) {
+        case TransactionError::OK:
+            return "No error";
+        case TransactionError::MISSING_INPUTS:
+            return "Missing inputs";
+        case TransactionError::ALREADY_IN_CHAIN:
+            return "Transaction already in block chain";
+        case TransactionError::P2P_DISABLED:
+            return "Peer-to-peer functionality missing or disabled";
+        case TransactionError::MEMPOOL_REJECTED:
+            return "Transaction rejected by AcceptToMemoryPool";
+        case TransactionError::MEMPOOL_ERROR:
+            return "AcceptToMemoryPool failed";
+        case TransactionError::INVALID_PSBT:
+            return "PSBT is not sane";
+        case TransactionError::PSBT_MISMATCH:
+            return "PSBTs not compatible (different transactions)";
+        case TransactionError::SIGHASH_MISMATCH:
+            return "Specified sighash value does not match existing value";
+        // no default case, so the compiler can warn about missing cases
+    }
+    assert(false);
+}
+
+std::string AmountHighWarn(const std::string& optname)
+{
+    return strprintf(_("%s is set very high!"), optname);
+}
+
+std::string AmountErrMsg(const char* const optname, const std::string& strValue)
+{
+    return strprintf(_("Invalid amount for -%s=<amount>: '%s'"), optname, strValue);
+}
diff --git a/src/util/error.h b/src/util/error.h
new file mode 100644
index 0000000000..d93309551b
--- /dev/null
+++ b/src/util/error.h
@@ -0,0 +1,38 @@
+// Copyright (c) 2010-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_ERROR_H
+#define BITCOIN_UTIL_ERROR_H
+
+/**
+ * util/error.h is a common place for definitions of simple error types and
+ * string functions. Types and functions defined here should not require any
+ * outside dependencies.
+ *
+ * Error types defined here can be used in different parts of the bitcoin
+ * codebase, to avoid the need to write boilerplate code catching and
+ * translating errors passed across wallet/node/rpc/gui code boundaries.
+ */
+
+#include <string>
+
+enum class TransactionError {
+    OK, //!< No error
+    MISSING_INPUTS,
+    ALREADY_IN_CHAIN,
+    P2P_DISABLED,
+    MEMPOOL_REJECTED,
+    MEMPOOL_ERROR,
+    INVALID_PSBT,
+    PSBT_MISMATCH,
+    SIGHASH_MISMATCH,
+};
+
+std::string TransactionErrorString(const TransactionError error);
+
+std::string AmountHighWarn(const std::string& optname);
+
+std::string AmountErrMsg(const char* const optname, const std::string& strValue);
+
+#endif // BITCOIN_UTIL_ERROR_H
diff --git a/src/util/fees.cpp b/src/util/fees.cpp
new file mode 100644
index 0000000000..5fdaa1284c
--- /dev/null
+++ b/src/util/fees.cpp
@@ -0,0 +1,42 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <policy/fees.h>
+
+#include <string>
+
+std::string StringForFeeReason(FeeReason reason) {
+    static const std::map<FeeReason, std::string> fee_reason_strings = {
+        {FeeReason::NONE, "None"},
+        {FeeReason::HALF_ESTIMATE, "Half Target 60% Threshold"},
+        {FeeReason::FULL_ESTIMATE, "Target 85% Threshold"},
+        {FeeReason::DOUBLE_ESTIMATE, "Double Target 95% Threshold"},
+        {FeeReason::CONSERVATIVE, "Conservative Double Target longer horizon"},
+        {FeeReason::MEMPOOL_MIN, "Mempool Min Fee"},
+        {FeeReason::PAYTXFEE, "PayTxFee set"},
+        {FeeReason::FALLBACK, "Fallback fee"},
+        {FeeReason::REQUIRED, "Minimum Required Fee"},
+        {FeeReason::MAXTXFEE, "MaxTxFee limit"}
+    };
+    auto reason_string = fee_reason_strings.find(reason);
+
+    if (reason_string == fee_reason_strings.end()) return "Unknown";
+
+    return reason_string->second;
+}
+
+bool FeeModeFromString(const std::string& mode_string, FeeEstimateMode& fee_estimate_mode) {
+    static const std::map<std::string, FeeEstimateMode> fee_modes = {
+        {"UNSET", FeeEstimateMode::UNSET},
+        {"ECONOMICAL", FeeEstimateMode::ECONOMICAL},
+        {"CONSERVATIVE", FeeEstimateMode::CONSERVATIVE},
+    };
+    auto mode = fee_modes.find(mode_string);
+
+    if (mode == fee_modes.end()) return false;
+
+    fee_estimate_mode = mode->second;
+    return true;
+}
diff --git a/src/util/fees.h b/src/util/fees.h
new file mode 100644
index 0000000000..fc355ce9c2
--- /dev/null
+++ b/src/util/fees.h
@@ -0,0 +1,16 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_UTIL_FEES_H
+#define BITCOIN_UTIL_FEES_H
+
+#include <string>
+
+enum class FeeEstimateMode;
+enum class FeeReason;
+
+bool FeeModeFromString(const std::string& mode_string, FeeEstimateMode& fee_estimate_mode);
+std::string StringForFeeReason(FeeReason reason);
+
+#endif // BITCOIN_UTIL_FEES_H
diff --git a/src/util/rbf.cpp b/src/util/rbf.cpp
new file mode 100644
index 0000000000..d520a9606d
--- /dev/null
+++ b/src/util/rbf.cpp
@@ -0,0 +1,17 @@
+// Copyright (c) 2016-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/rbf.h>
+
+#include <primitives/transaction.h>
+
+bool SignalsOptInRBF(const CTransaction &tx)
+{
+    for (const CTxIn &txin : tx.vin) {
+        if (txin.nSequence <= MAX_BIP125_RBF_SEQUENCE) {
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/src/util/rbf.h b/src/util/rbf.h
new file mode 100644
index 0000000000..d3ef110628
--- /dev/null
+++ b/src/util/rbf.h
@@ -0,0 +1,18 @@
+// Copyright (c) 2016-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_RBF_H
+#define BITCOIN_UTIL_RBF_H
+
+#include <cstdint>
+
+class CTransaction;
+
+static const uint32_t MAX_BIP125_RBF_SEQUENCE = 0xfffffffd;
+
+// Check whether the sequence numbers on this transaction are signaling
+// opt-in to replace-by-fee, according to BIP 125
+bool SignalsOptInRBF(const CTransaction &tx);
+
+#endif // BITCOIN_UTIL_RBF_H
diff --git a/src/util/url.cpp b/src/util/url.cpp
new file mode 100644
index 0000000000..49eacbf2d0
--- /dev/null
+++ b/src/util/url.cpp
@@ -0,0 +1,21 @@
+// Copyright (c) 2015-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/url.h>
+
+#include <event2/http.h>
+#include <stdlib.h>
+#include <string>
+
+std::string urlDecode(const std::string &urlEncoded) {
+    std::string res;
+    if (!urlEncoded.empty()) {
+        char *decoded = evhttp_uridecode(urlEncoded.c_str(), false, nullptr);
+        if (decoded) {
+            res = std::string(decoded);
+            free(decoded);
+        }
+    }
+    return res;
+}
diff --git a/src/util/url.h b/src/util/url.h
new file mode 100644
index 0000000000..3d7315a338
--- /dev/null
+++ b/src/util/url.h
@@ -0,0 +1,12 @@
+// Copyright (c) 2015-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_URL_H
+#define BITCOIN_UTIL_URL_H
+
+#include <string>
+
+std::string urlDecode(const std::string &urlEncoded);
+
+#endif // BITCOIN_UTIL_URL_H
diff --git a/src/util/validation.cpp b/src/util/validation.cpp
new file mode 100644
index 0000000000..fe1f5a277e
--- /dev/null
+++ b/src/util/validation.cpp
@@ -0,0 +1,20 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/validation.h>
+
+#include <consensus/validation.h>
+#include <tinyformat.h>
+
+/** Convert CValidationState to a human-readable message for logging */
+std::string FormatStateMessage(const CValidationState &state)
+{
+    return strprintf("%s%s (code %i)",
+        state.GetRejectReason(),
+        state.GetDebugMessage().empty() ? "" : ", "+state.GetDebugMessage(),
+        state.GetRejectCode());
+}
+
+const std::string strMessageMagic = "Bitcoin Signed Message:\n";
diff --git a/src/util/validation.h b/src/util/validation.h
new file mode 100644
index 0000000000..32559853ee
--- /dev/null
+++ b/src/util/validation.h
@@ -0,0 +1,18 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_VALIDATION_H
+#define BITCOIN_UTIL_VALIDATION_H
+
+#include <string>
+
+class CValidationState;
+
+/** Convert CValidationState to a human-readable message for logging */
+std::string FormatStateMessage(const CValidationState &state);
+
+extern const std::string strMessageMagic;
+
+#endif // BITCOIN_UTIL_VALIDATION_H
diff --git a/src/validation.cpp b/src/validation.cpp
index eee050dc89..be6257ea28 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -12,6 +12,7 @@
 #include <checkqueue.h>
 #include <consensus/consensus.h>
 #include <consensus/merkle.h>
+#include <consensus/tx_check.h>
 #include <consensus/tx_verify.h>
 #include <consensus/validation.h>
 #include <cuckoocache.h>
@@ -21,6 +22,7 @@
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <policy/rbf.h>
+#include <policy/settings.h>
 #include <pow.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
@@ -37,8 +39,10 @@
 #include <ui_interface.h>
 #include <undo.h>
 #include <util/moneystr.h>
+#include <util/rbf.h>
 #include <util/strencodings.h>
 #include <util/system.h>
+#include <util/validation.h>
 #include <validationinterface.h>
 #include <warnings.h>
 
@@ -236,7 +240,6 @@ std::atomic_bool fImporting(false);
 std::atomic_bool fReindex(false);
 bool fHavePruned = false;
 bool fPruneMode = false;
-bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
 bool fRequireStandard = true;
 bool fCheckBlockIndex = false;
 bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
@@ -258,8 +261,6 @@ std::atomic_bool g_is_mempool_loaded{false};
 /** Constant stuff for coinbase transactions we create: */
 CScript COINBASE_FLAGS;
 
-const std::string strMessageMagic = "Bitcoin Signed Message:\n";
-
 // Internal stuff
 namespace {
     CBlockIndex *&pindexBestInvalid = g_chainstate.pindexBestInvalid;
@@ -461,15 +462,6 @@ static void LimitMempoolSize(CTxMemPool& pool, size_t limit, unsigned long age)
         pcoinsTip->Uncache(removed);
 }
 
-/** Convert CValidationState to a human-readable message for logging */
-std::string FormatStateMessage(const CValidationState &state)
-{
-    return strprintf("%s%s (code %i)",
-        state.GetRejectReason(),
-        state.GetDebugMessage().empty() ? "" : ", "+state.GetDebugMessage(),
-        state.GetRejectCode());
-}
-
 static bool IsCurrentForFeeEstimation() EXCLUSIVE_LOCKS_REQUIRED(cs_main)
 {
     AssertLockHeld(cs_main);
diff --git a/src/validation.h b/src/validation.h
index d84e3a0dbc..9f00cab49e 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -114,8 +114,6 @@ static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
 /** Maximum age of our tip in seconds for us to be considered current for fee estimation */
 static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60;
 
-/** Default for -permitbaremultisig */
-static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
 static const bool DEFAULT_TXINDEX = false;
 static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
@@ -152,14 +150,12 @@ extern CTxMemPool mempool;
 extern std::atomic_bool g_is_mempool_loaded;
 typedef std::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
 extern BlockMap& mapBlockIndex GUARDED_BY(cs_main);
-extern const std::string strMessageMagic;
 extern Mutex g_best_block_mutex;
 extern std::condition_variable g_best_block_cv;
 extern uint256 g_best_block;
 extern std::atomic_bool fImporting;
 extern std::atomic_bool fReindex;
 extern int nScriptCheckThreads;
-extern bool fIsBareMultisigStd;
 extern bool fRequireStandard;
 extern bool fCheckBlockIndex;
 extern bool fCheckpointsEnabled;
@@ -301,9 +297,6 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
                         bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
                         bool bypass_limits, const CAmount nAbsurdFee, bool test_accept=false) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
-/** Convert CValidationState to a human-readable message for logging */
-std::string FormatStateMessage(const CValidationState &state);
-
 /** Get the BIP9 state for a given deployment at the current tip. */
 ThresholdState VersionBitsTipState(const Consensus::Params& params, Consensus::DeploymentPos pos);
 
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index ef7f3be728..e0f083b8ea 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -14,7 +14,9 @@
 #include <validation.h> //for mempool access
 #include <txmempool.h>
 #include <util/moneystr.h>
+#include <util/rbf.h>
 #include <util/system.h>
+#include <util/validation.h>
 #include <net.h>
 
 //! Check whether transaction has descendant in wallet or mempool, or has been
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index a8096dc671..e7eea94e06 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -9,6 +9,7 @@
 #include <net.h>
 #include <scheduler.h>
 #include <outputtype.h>
+#include <util/error.h>
 #include <util/system.h>
 #include <util/moneystr.h>
 #include <validation.h>
@@ -130,58 +131,6 @@ bool WalletInit::ParameterInteraction() const
     return true;
 }
 
-bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
-{
-    if (gArgs.IsArgSet("-walletdir")) {
-        fs::path wallet_dir = gArgs.GetArg("-walletdir", "");
-        boost::system::error_code error;
-        // 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)) {
-            chain.initError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
-            return false;
-        } else if (!fs::is_directory(wallet_dir)) {
-            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()) {
-            chain.initError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
-            return false;
-        }
-        gArgs.ForceSetArg("-walletdir", canonical_wallet_dir.string());
-    }
-
-    LogPrintf("Using wallet directory %s\n", GetWalletDir().string());
-
-    chain.initMessage(_("Verifying wallet(s)..."));
-
-    // Parameter interaction code should have thrown an error if -salvagewallet
-    // was enabled with more than wallet file, so the wallet_files size check
-    // here should have no effect.
-    bool salvage_wallet = gArgs.GetBoolArg("-salvagewallet", false) && wallet_files.size() <= 1;
-
-    // Keep track of each wallet absolute path to detect duplicates.
-    std::set<fs::path> wallet_paths;
-
-    for (const auto& wallet_file : wallet_files) {
-        WalletLocation location(wallet_file);
-
-        if (!wallet_paths.insert(location.GetPath()).second) {
-            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()) chain.initError(error_string);
-        if (!warning_string.empty()) chain.initWarning(warning_string);
-        if (!verify_success) return false;
-    }
-
-    return true;
-}
-
 void WalletInit::Construct(InitInterfaces& interfaces) const
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
@@ -191,52 +140,3 @@ void WalletInit::Construct(InitInterfaces& interfaces) const
     gArgs.SoftSetArg("-wallet", "");
     interfaces.chain_clients.emplace_back(interfaces::MakeWalletClient(*interfaces.chain, gArgs.GetArgs("-wallet")));
 }
-
-bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
-{
-    for (const std::string& walletFile : wallet_files) {
-        std::shared_ptr<CWallet> pwallet = CWallet::CreateWalletFromFile(chain, WalletLocation(walletFile));
-        if (!pwallet) {
-            return false;
-        }
-        AddWallet(pwallet);
-    }
-
-    return true;
-}
-
-void StartWallets(CScheduler& scheduler)
-{
-    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
-        pwallet->postInitProcess();
-    }
-
-    // Schedule periodic wallet flushes and tx rebroadcasts
-    scheduler.scheduleEvery(MaybeCompactWalletDB, 500);
-    scheduler.scheduleEvery(MaybeResendWalletTxs, 1000);
-}
-
-void FlushWallets()
-{
-    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
-        pwallet->Flush(false);
-    }
-}
-
-void StopWallets()
-{
-    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
-        pwallet->Flush(true);
-    }
-}
-
-void UnloadWallets()
-{
-    auto wallets = GetWallets();
-    while (!wallets.empty()) {
-        auto wallet = wallets.back();
-        wallets.pop_back();
-        RemoveWallet(wallet);
-        UnloadWallet(std::move(wallet));
-    }
-}
diff --git a/src/wallet/load.cpp b/src/wallet/load.cpp
new file mode 100644
index 0000000000..79c5f439df
--- /dev/null
+++ b/src/wallet/load.cpp
@@ -0,0 +1,112 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <wallet/load.h>
+
+#include <interfaces/chain.h>
+#include <scheduler.h>
+#include <util/system.h>
+#include <wallet/wallet.h>
+
+bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
+{
+    if (gArgs.IsArgSet("-walletdir")) {
+        fs::path wallet_dir = gArgs.GetArg("-walletdir", "");
+        boost::system::error_code error;
+        // 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)) {
+            chain.initError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
+            return false;
+        } else if (!fs::is_directory(wallet_dir)) {
+            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()) {
+            chain.initError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
+            return false;
+        }
+        gArgs.ForceSetArg("-walletdir", canonical_wallet_dir.string());
+    }
+
+    LogPrintf("Using wallet directory %s\n", GetWalletDir().string());
+
+    chain.initMessage(_("Verifying wallet(s)..."));
+
+    // Parameter interaction code should have thrown an error if -salvagewallet
+    // was enabled with more than wallet file, so the wallet_files size check
+    // here should have no effect.
+    bool salvage_wallet = gArgs.GetBoolArg("-salvagewallet", false) && wallet_files.size() <= 1;
+
+    // Keep track of each wallet absolute path to detect duplicates.
+    std::set<fs::path> wallet_paths;
+
+    for (const auto& wallet_file : wallet_files) {
+        WalletLocation location(wallet_file);
+
+        if (!wallet_paths.insert(location.GetPath()).second) {
+            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()) chain.initError(error_string);
+        if (!warning_string.empty()) chain.initWarning(warning_string);
+        if (!verify_success) return false;
+    }
+
+    return true;
+}
+
+bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
+{
+    for (const std::string& walletFile : wallet_files) {
+        std::shared_ptr<CWallet> pwallet = CWallet::CreateWalletFromFile(chain, WalletLocation(walletFile));
+        if (!pwallet) {
+            return false;
+        }
+        AddWallet(pwallet);
+    }
+
+    return true;
+}
+
+void StartWallets(CScheduler& scheduler)
+{
+    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
+        pwallet->postInitProcess();
+    }
+
+    // Schedule periodic wallet flushes and tx rebroadcasts
+    scheduler.scheduleEvery(MaybeCompactWalletDB, 500);
+    scheduler.scheduleEvery(MaybeResendWalletTxs, 1000);
+}
+
+void FlushWallets()
+{
+    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
+        pwallet->Flush(false);
+    }
+}
+
+void StopWallets()
+{
+    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
+        pwallet->Flush(true);
+    }
+}
+
+void UnloadWallets()
+{
+    auto wallets = GetWallets();
+    while (!wallets.empty()) {
+        auto wallet = wallets.back();
+        wallets.pop_back();
+        RemoveWallet(wallet);
+        UnloadWallet(std::move(wallet));
+    }
+}
diff --git a/src/wallet/load.h b/src/wallet/load.h
new file mode 100644
index 0000000000..9bb6f2166e
--- /dev/null
+++ b/src/wallet/load.h
@@ -0,0 +1,38 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_WALLET_LOAD_H
+#define BITCOIN_WALLET_LOAD_H
+
+#include <string>
+#include <vector>
+
+class CScheduler;
+
+namespace interfaces {
+class Chain;
+} // namespace interfaces
+
+//! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
+//! This function will perform salvage on the wallet if requested, as long as only one wallet is
+//! being loaded (WalletParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
+bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
+
+//! Load wallet databases.
+bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
+
+//! Complete startup of wallets.
+void StartWallets(CScheduler& scheduler);
+
+//! Flush all wallets in preparation for shutdown.
+void FlushWallets();
+
+//! Stop all wallets. Wallets will be flushed first.
+void StopWallets();
+
+//! Close all wallets.
+void UnloadWallets();
+
+#endif // BITCOIN_WALLET_LOAD_H
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index d9ae0b9bd6..37e2930ee6 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -7,7 +7,6 @@
 #include <chain.h>
 #include <consensus/validation.h>
 #include <core_io.h>
-#include <httpserver.h>
 #include <init.h>
 #include <interfaces/chain.h>
 #include <validation.h>
@@ -19,7 +18,7 @@
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <policy/rbf.h>
-#include <rpc/rawtransaction.h>
+#include <rpc/rawtransaction_util.h>
 #include <rpc/server.h>
 #include <rpc/util.h>
 #include <script/descriptor.h>
@@ -27,8 +26,11 @@
 #include <shutdown.h>
 #include <timedata.h>
 #include <util/bip32.h>
+#include <util/fees.h>
 #include <util/system.h>
 #include <util/moneystr.h>
+#include <util/url.h>
+#include <util/validation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/feebumper.h>
 #include <wallet/psbtwallet.h>
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 9f89cbefa0..2ef6850a2e 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -29,7 +29,11 @@
 #include <timedata.h>
 #include <txmempool.h>
 #include <util/bip32.h>
+#include <util/error.h>
+#include <util/fees.h>
 #include <util/moneystr.h>
+#include <util/rbf.h>
+#include <util/validation.h>
 #include <wallet/fees.h>
 
 #include <algorithm>
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 587b2814c0..cefdf479c6 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -35,26 +35,6 @@
 #include <utility>
 #include <vector>
 
-//! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
-//! This function will perform salvage on the wallet if requested, as long as only one wallet is
-//! being loaded (WalletParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
-bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
-
-//! Load wallet databases.
-bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
-
-//! Complete startup of wallets.
-void StartWallets(CScheduler& scheduler);
-
-//! Flush all wallets in preparation for shutdown.
-void FlushWallets();
-
-//! Stop all wallets. Wallets will be flushed first.
-void StopWallets();
-
-//! Close all wallets.
-void UnloadWallets();
-
 //! Explicitly unload and delete the wallet.
 //! Blocks the current thread after signaling the unload intent so that all
 //! wallet clients release the wallet.
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 5149bb0263..3122cd6fa4 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -5,7 +5,7 @@
 
 #include <wallet/walletdb.h>
 
-#include <consensus/tx_verify.h>
+#include <consensus/tx_check.h>
 #include <consensus/validation.h>
 #include <fs.h>
 #include <key_io.h>