diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -1000,6 +1000,7 @@
                          const std::set<int> &setSubtractFeeFromOutputs,
                          bool keepReserveKey = true,
                          const CTxDestination &destChange = CNoDestination());
+    bool SignTransaction(CMutableTransaction &tx);
 
     /**
      * Create a new transaction paying the recipients with a set of coins
@@ -1021,7 +1022,8 @@
     bool AddAccountingEntry(const CAccountingEntry &);
     bool AddAccountingEntry(const CAccountingEntry &, CWalletDB *pwalletdb);
     template <typename ContainerType>
-    bool DummySignTx(CMutableTransaction &txNew, const ContainerType &coins);
+    bool DummySignTx(CMutableTransaction &txNew,
+                     const ContainerType &coins) const;
 
     static CFeeRate fallbackFee;
 
@@ -1260,7 +1262,7 @@
 // that each entry corresponds to each vIn, in order.
 template <typename ContainerType>
 bool CWallet::DummySignTx(CMutableTransaction &txNew,
-                          const ContainerType &coins) {
+                          const ContainerType &coins) const {
     // Fill in dummy signatures for fee calculation.
     int nIn = 0;
     for (const auto &coin : coins) {
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2727,6 +2727,32 @@
     return res;
 }
 
+bool CWallet::SignTransaction(CMutableTransaction &tx) {
+    // sign the new tx
+    CTransaction txNewConst(tx);
+    int nIn = 0;
+    for (auto &input : tx.vin) {
+        auto mi = mapWallet.find(input.prevout.GetTxId());
+        if (mi == mapWallet.end() ||
+            input.prevout.GetN() >= mi->second.tx->vout.size()) {
+            return false;
+        }
+        const CScript &scriptPubKey =
+            mi->second.tx->vout[input.prevout.GetN()].scriptPubKey;
+        const Amount amount = mi->second.tx->vout[input.prevout.GetN()].nValue;
+        SignatureData sigdata;
+        SigHashType sigHashType = SigHashType().withForkId();
+        if (!ProduceSignature(TransactionSignatureCreator(
+                                  this, &txNewConst, nIn, amount, sigHashType),
+                              scriptPubKey, sigdata)) {
+            return false;
+        }
+        UpdateTransaction(tx, nIn, sigdata);
+        nIn++;
+    }
+    return true;
+}
+
 bool CWallet::FundTransaction(CMutableTransaction &tx, Amount &nFeeRet,
                               bool overrideEstimatedFeeRate,
                               const CFeeRate &specificFeeRate,