add tool to sweep a private key in wif format to any address

drongo

@@ -1 +1 @@
-Subproject commit 3a557e3af8bd17abf7697f93e586baf67745b460
+Subproject commit 34bd72d87aac7286fd0ca7e94f5a931f00d13cb4

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -161,6 +161,9 @@ public class AppController implements Initializable {
     @FXML
     private MenuItem sendToMany;
 
+    @FXML
+    private MenuItem sweepPrivateKey;
+
     @FXML
     private MenuItem findMixingPartner;
 
@@ -333,6 +336,7 @@ public class AppController implements Initializable {
         lockWallet.setDisable(true);
         refreshWallet.disableProperty().bind(Bindings.or(exportWallet.disableProperty(), Bindings.or(serverToggle.disableProperty(), AppServices.onlineProperty().not())));
         sendToMany.disableProperty().bind(exportWallet.disableProperty());
+        sweepPrivateKey.disableProperty().bind(Bindings.or(serverToggle.disableProperty(), AppServices.onlineProperty().not()));
         showPayNym.disableProperty().bind(findMixingPartner.disableProperty());
         findMixingPartner.setDisable(true);
         AppServices.onlineProperty().addListener((observable, oldValue, newValue) -> {
@@ -1230,6 +1234,18 @@ public class AppController implements Initializable {
         }
     }
 
+    public void sweepPrivateKey(ActionEvent event) {
+        Wallet wallet = null;
+        WalletForm selectedWalletForm = getSelectedWalletForm();
+        if(selectedWalletForm != null) {
+            wallet = selectedWalletForm.getWallet();
+        }
+
+        PrivateKeySweepDialog dialog = new PrivateKeySweepDialog(wallet);
+        Optional<Transaction> optTransaction = dialog.showAndWait();
+        optTransaction.ifPresent(transaction -> addTransactionTab(null, null, transaction));
+    }
+
     public void findMixingPartner(ActionEvent event) {
         WalletForm selectedWalletForm = getSelectedWalletForm();
         if(selectedWalletForm != null) {

src/main/java/com/sparrowwallet/sparrow/AppServices.java

@@ -76,6 +76,10 @@ public class AppServices {
     private static final Currency DEFAULT_FIAT_CURRENCY = Currency.getInstance("USD");
     private static final String TOR_DEFAULT_PROXY_CIRCUIT_ID = "default";
 
+    public static final List<Integer> TARGET_BLOCKS_RANGE = List.of(1, 2, 3, 4, 5, 10, 25, 50);
+    public static final List<Long> FEE_RATES_RANGE = List.of(1L, 2L, 4L, 8L, 16L, 32L, 64L, 128L, 256L, 512L, 1024L);
+    public static final double FALLBACK_FEE_RATE = 20000d / 1000;
+
     private static AppServices INSTANCE;
 
     private final WhirlpoolServices whirlpoolServices = new WhirlpoolServices();
@@ -591,6 +595,11 @@ public class AppServices {
         return latestBlockHeader;
     }
 
+    public static Double getDefaultFeeRate() {
+        int defaultTarget = TARGET_BLOCKS_RANGE.get((TARGET_BLOCKS_RANGE.size() / 2) - 1);
+        return getTargetBlockFeeRates() == null ? FALLBACK_FEE_RATE : getTargetBlockFeeRates().get(defaultTarget);
+    }
+
     public static Map<Integer, Double> getTargetBlockFeeRates() {
         return targetBlockFeeRates;
     }

src/main/java/com/sparrowwallet/sparrow/control/BlockTargetFeeRatesChart.java

@@ -1,6 +1,6 @@
 package com.sparrowwallet.sparrow.control;
 
-import com.sparrowwallet.sparrow.wallet.SendController;
+import com.sparrowwallet.sparrow.AppServices;
 import javafx.beans.NamedArg;
 import javafx.scene.Node;
 import javafx.scene.chart.Axis;
@@ -28,7 +28,7 @@ public class BlockTargetFeeRatesChart extends LineChart<String, Number> {
 
         for(Iterator<Integer> targetBlocksIter = targetBlocksFeeRates.keySet().iterator(); targetBlocksIter.hasNext(); ) {
             Integer targetBlocks = targetBlocksIter.next();
-            if(SendController.TARGET_BLOCKS_RANGE.contains(targetBlocks)) {
+            if(AppServices.TARGET_BLOCKS_RANGE.contains(targetBlocks)) {
                 String category = targetBlocks + (targetBlocksIter.hasNext() ? "" : "+");
                 XYChart.Data<String, Number> data = new XYChart.Data<>(category, targetBlocksFeeRates.get(targetBlocks));
                 feeRateSeries.getData().add(data);

src/main/java/com/sparrowwallet/sparrow/control/MempoolSizeFeeRatesChart.java

@@ -1,8 +1,8 @@
 package com.sparrowwallet.sparrow.control;
 
+import com.sparrowwallet.sparrow.AppServices;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.net.MempoolRateSize;
-import com.sparrowwallet.sparrow.wallet.SendController;
 import javafx.application.Platform;
 import javafx.beans.NamedArg;
 import javafx.collections.FXCollections;
@@ -79,7 +79,7 @@ public class MempoolSizeFeeRatesChart extends StackedAreaChart<String, Number> {
         });
 
         long previousFeeRate = 0;
-        for(Long feeRate : SendController.FEE_RATES_RANGE) {
+        for(Long feeRate : AppServices.FEE_RATES_RANGE) {
             XYChart.Series<String, Number> series = new XYChart.Series<>();
             series.setName(feeRate + "+ sats/vB");
             long seriesTotalVSize = 0;

src/main/java/com/sparrowwallet/sparrow/control/MessageSignDialog.java

@@ -103,6 +103,7 @@ public class MessageSignDialog extends Dialog<ButtonBar.ButtonData> {
 
         final DialogPane dialogPane = getDialogPane();
         dialogPane.getStylesheets().add(AppServices.class.getResource("general.css").toExternalForm());
+        dialogPane.getStylesheets().add(AppServices.class.getResource("dialog.css").toExternalForm());
         AppServices.setStageIcon(dialogPane.getScene().getWindow());
         dialogPane.setHeaderText(title == null ? (wallet == null ? "Verify Message" : "Sign/Verify Message") : title);
 
@@ -120,6 +121,7 @@ public class MessageSignDialog extends Dialog<ButtonBar.ButtonData> {
         Form form = new Form();
         Fieldset fieldset = new Fieldset();
         fieldset.setText("");
+        fieldset.setSpacing(10);
 
         Field addressField = new Field();
         addressField.setText("Address:");

src/main/java/com/sparrowwallet/sparrow/control/PrivateKeySweepDialog.java

@@ -0,0 +1,346 @@
+package com.sparrowwallet.sparrow.control;
+
+import com.google.common.io.Files;
+import com.sparrowwallet.drongo.KeyPurpose;
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.address.InvalidAddressException;
+import com.sparrowwallet.drongo.crypto.DumpedPrivateKey;
+import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.policy.PolicyType;
+import com.sparrowwallet.drongo.protocol.*;
+import com.sparrowwallet.drongo.psbt.PSBT;
+import com.sparrowwallet.drongo.psbt.PSBTInput;
+import com.sparrowwallet.drongo.wallet.Wallet;
+import com.sparrowwallet.sparrow.AppServices;
+import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
+import com.sparrowwallet.sparrow.net.ElectrumServer;
+import javafx.application.Platform;
+import javafx.collections.FXCollections;
+import javafx.event.ActionEvent;
+import javafx.scene.control.*;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.Priority;
+import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
+import javafx.stage.FileChooser;
+import javafx.stage.Stage;
+import javafx.util.StringConverter;
+import org.controlsfx.glyphfont.Glyph;
+import org.controlsfx.validation.ValidationResult;
+import org.controlsfx.validation.ValidationSupport;
+import org.controlsfx.validation.decoration.StyleClassValidationDecoration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tornadofx.control.Field;
+import tornadofx.control.Fieldset;
+import tornadofx.control.Form;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+import static com.sparrowwallet.drongo.protocol.ScriptType.P2TR;
+
+public class PrivateKeySweepDialog extends Dialog<Transaction> {
+    private static final Logger log = LoggerFactory.getLogger(PrivateKeySweepDialog.class);
+
+    private final TextArea key;
+    private final ComboBox<ScriptType> keyScriptType;
+    private final CopyableLabel keyAddress;
+    private final ComboBoxTextField toAddress;
+    private final ComboBox<Wallet> toWallet;
+
+    public PrivateKeySweepDialog(Wallet wallet) {
+        final DialogPane dialogPane = getDialogPane();
+        dialogPane.getStylesheets().add(AppServices.class.getResource("general.css").toExternalForm());
+        dialogPane.getStylesheets().add(AppServices.class.getResource("dialog.css").toExternalForm());
+        AppServices.setStageIcon(dialogPane.getScene().getWindow());
+        dialogPane.setHeaderText("Sweep Private Key");
+
+        Image image = new Image("image/seed.png", 50, 50, false, false);
+        if(!image.isError()) {
+            ImageView imageView = new ImageView();
+            imageView.setSmooth(false);
+            imageView.setImage(image);
+            dialogPane.setGraphic(imageView);
+        }
+
+        VBox vBox = new VBox();
+        vBox.setSpacing(20);
+
+        Form form = new Form();
+        Fieldset fieldset = new Fieldset();
+        fieldset.setText("");
+        fieldset.setSpacing(10);
+
+        Field keyField = new Field();
+        keyField.setText("Private Key:");
+        key = new TextArea();
+        key.setWrapText(true);
+        key.setPromptText("Wallet Import Format (WIF)");
+        key.setPrefRowCount(2);
+        key.getStyleClass().add("fixed-width");
+        HBox keyBox = new HBox(5);
+        VBox keyButtonBox = new VBox(5);
+        Button scanKey = new Button("", getGlyph(FontAwesome5.Glyph.CAMERA));
+        scanKey.setOnAction(event -> scanPrivateKey());
+        Button readKey = new Button("", getGlyph(FontAwesome5.Glyph.FILE_IMPORT));
+        readKey.setOnAction(event -> readPrivateKey());
+        keyButtonBox.getChildren().addAll(scanKey, readKey);
+        keyBox.getChildren().addAll(key, keyButtonBox);
+        HBox.setHgrow(key, Priority.ALWAYS);
+        keyField.getInputs().add(keyBox);
+
+        Field keyScriptTypeField = new Field();
+        keyScriptTypeField.setText("Script Type:");
+        keyScriptType = new ComboBox<>();
+        keyScriptType.setItems(FXCollections.observableList(ScriptType.getAddressableScriptTypes(PolicyType.SINGLE)));
+        keyScriptTypeField.getInputs().add(keyScriptType);
+
+        keyScriptType.setConverter(new StringConverter<ScriptType>() {
+            @Override
+            public String toString(ScriptType scriptType) {
+                return scriptType == null ? "" : scriptType.getDescription();
+            }
+
+            @Override
+            public ScriptType fromString(String string) {
+                return null;
+            }
+        });
+
+        Field addressField = new Field();
+        addressField.setText("Address:");
+        keyAddress = new CopyableLabel();
+        keyAddress.getStyleClass().add("fixed-width");
+        addressField.getInputs().add(keyAddress);
+
+        Field toAddressField = new Field();
+        toAddressField.setText("Sweep to:");
+        toAddress = new ComboBoxTextField();
+        toAddress.getStyleClass().add("fixed-width");
+        toWallet = new ComboBox<>();
+        toWallet.setItems(FXCollections.observableList(new ArrayList<>(AppServices.get().getOpenWallets().keySet())));
+        toAddress.setComboProperty(toWallet);
+        toWallet.prefWidthProperty().bind(toAddress.widthProperty());
+        StackPane stackPane = new StackPane();
+        stackPane.getChildren().addAll(toWallet, toAddress);
+        toAddressField.getInputs().add(stackPane);
+
+        fieldset.getChildren().addAll(keyField, keyScriptTypeField, addressField, toAddressField);
+        form.getChildren().add(fieldset);
+        dialogPane.setContent(form);
+
+        ButtonType createButtonType = new javafx.scene.control.ButtonType("Create Transaction", ButtonBar.ButtonData.APPLY);
+        ButtonType cancelButtonType = new javafx.scene.control.ButtonType("Cancel", ButtonBar.ButtonData.CANCEL_CLOSE);
+
+        dialogPane.getButtonTypes().addAll(cancelButtonType, createButtonType);
+
+        Button createButton = (Button) dialogPane.lookupButton(createButtonType);
+        createButton.setDefaultButton(true);
+        createButton.setDisable(true);
+        createButton.addEventFilter(ActionEvent.ACTION, event -> {
+            createTransaction();
+            event.consume();
+        });
+
+        key.textProperty().addListener((observable, oldValue, newValue) -> {
+            boolean isValidKey = isValidKey();
+            createButton.setDisable(!isValidKey || !isValidToAddress());
+            if(isValidKey) {
+                setFromAddress();
+            }
+        });
+
+        keyScriptType.valueProperty().addListener((observable, oldValue, newValue) -> {
+            if(isValidKey()) {
+                setFromAddress();
+            }
+        });
+
+        toAddress.textProperty().addListener((observable, oldValue, newValue) -> {
+            createButton.setDisable(!isValidKey() || !isValidToAddress());
+        });
+
+        toWallet.valueProperty().addListener((observable, oldValue, selectedWallet) -> {
+            if(selectedWallet != null) {
+                toAddress.setText(selectedWallet.getAddress(selectedWallet.getFreshNode(KeyPurpose.RECEIVE)).toString());
+            }
+        });
+
+        keyScriptType.setValue(ScriptType.P2PKH);
+        if(wallet != null) {
+            toAddress.setText(wallet.getAddress(wallet.getFreshNode(KeyPurpose.RECEIVE)).toString());
+        }
+
+        AppServices.onEscapePressed(dialogPane.getScene(), () -> setResult(null));
+        AppServices.moveToActiveWindowScreen(this);
+        setResultConverter(dialogButton -> null);
+        dialogPane.setPrefWidth(680);
+
+        ValidationSupport validationSupport = new ValidationSupport();
+        Platform.runLater(() -> {
+            validationSupport.setValidationDecorator(new StyleClassValidationDecoration());
+            validationSupport.registerValidator(key, (Control c, String newValue) -> ValidationResult.fromErrorIf(c, "Invalid private Key", !key.getText().isEmpty() && !isValidKey()));
+            validationSupport.registerValidator(toAddress, (Control c, String newValue) -> ValidationResult.fromErrorIf(c, "Invalid address", !toAddress.getText().isEmpty() && !isValidToAddress()));
+        });
+    }
+
+    private boolean isValidKey() {
+        try {
+            DumpedPrivateKey privateKey = getPrivateKey();
+            return true;
+        } catch(Exception e) {
+            return false;
+        }
+    }
+
+    private DumpedPrivateKey getPrivateKey() {
+        return DumpedPrivateKey.fromBase58(key.getText());
+    }
+
+    private boolean isValidToAddress() {
+        try {
+            Address address = getToAddress();
+            return true;
+        } catch (InvalidAddressException e) {
+            return false;
+        }
+    }
+
+    private Address getToAddress() throws InvalidAddressException {
+        return Address.fromString(toAddress.getText());
+    }
+
+    private void setFromAddress() {
+        DumpedPrivateKey privateKey = getPrivateKey();
+        ScriptType scriptType = keyScriptType.getValue();
+        Address address = scriptType.getAddress(privateKey.getKey());
+        keyAddress.setText(address.toString());
+    }
+
+    private void scanPrivateKey() {
+        QRScanDialog qrScanDialog = new QRScanDialog();
+        Optional<QRScanDialog.Result> result = qrScanDialog.showAndWait();
+        if(result.isPresent() && result.get().payload != null) {
+            key.setText(result.get().payload);
+        }
+    }
+
+    private void readPrivateKey() {
+        Stage window = new Stage();
+        FileChooser fileChooser = new FileChooser();
+        fileChooser.setTitle("Open Private Key File");
+
+        AppServices.moveToActiveWindowScreen(window, 800, 450);
+        File file = fileChooser.showOpenDialog(window);
+        if(file != null) {
+            if(file.length() > 1024) {
+                AppServices.showErrorDialog("Invalid private key file", "This file does not contain a valid private key.");
+                return;
+            }
+
+            try {
+                key.setText(Files.asCharSource(file, StandardCharsets.UTF_8).read().trim());
+            } catch(IOException e) {
+                AppServices.showErrorDialog("Error reading private key file", e.getMessage());
+            }
+        }
+    }
+
+    private void createTransaction() {
+        try {
+            DumpedPrivateKey privateKey = getPrivateKey();
+            ScriptType scriptType = keyScriptType.getValue();
+            Address fromAddress = scriptType.getAddress(privateKey.getKey());
+            Address destAddress = getToAddress();
+
+            ElectrumServer.AddressUtxosService addressUtxosService = new ElectrumServer.AddressUtxosService(fromAddress);
+            addressUtxosService.setOnSucceeded(successEvent -> {
+                createTransaction(privateKey.getKey(), scriptType, addressUtxosService.getValue(), destAddress);
+            });
+            addressUtxosService.setOnFailed(failedEvent -> {
+                log.error("Error retrieving outputs for address " + fromAddress, failedEvent.getSource().getException());
+                AppServices.showErrorDialog("Error retrieving outputs for address", failedEvent.getSource().getException().getMessage());
+            });
+            addressUtxosService.start();
+        } catch(Exception e) {
+            log.error("Error creating sweep transaction", e);
+        }
+    }
+
+    private void createTransaction(ECKey privKey, ScriptType scriptType, List<TransactionOutput> txOutputs, Address destAddress) {
+        ECKey pubKey = ECKey.fromPublicOnly(privKey);
+
+        Transaction noFeeTransaction = new Transaction();
+        long total = 0;
+        for(TransactionOutput txOutput : txOutputs) {
+            scriptType.addSpendingInput(noFeeTransaction, txOutput, pubKey, TransactionSignature.dummy(scriptType == P2TR ? TransactionSignature.Type.SCHNORR : TransactionSignature.Type.ECDSA));
+            total += txOutput.getValue();
+        }
+
+        TransactionOutput sweepOutput = new TransactionOutput(noFeeTransaction, total, destAddress.getOutputScript());
+        noFeeTransaction.addOutput(sweepOutput);
+
+        Double feeRate = AppServices.getDefaultFeeRate();
+        long fee = (long)Math.ceil(noFeeTransaction.getVirtualSize() * feeRate);
+        if(feeRate == Transaction.DEFAULT_MIN_RELAY_FEE) {
+            fee++;
+        }
+
+        long dustThreshold = destAddress.getScriptType().getDustThreshold(sweepOutput, Transaction.DUST_RELAY_TX_FEE);
+        if(total - fee <= dustThreshold) {
+            AppServices.showErrorDialog("Insufficient funds", "The unspent outputs for this private key contain insufficient funds to spend (" + total + " sats).");
+            return;
+        }
+
+        Transaction transaction = new Transaction();
+        transaction.setVersion(2);
+        transaction.setLocktime(AppServices.getCurrentBlockHeight() == null ? 0 : AppServices.getCurrentBlockHeight());
+        for(TransactionInput txInput : noFeeTransaction.getInputs()) {
+            transaction.addInput(txInput);
+        }
+        transaction.addOutput(new TransactionOutput(transaction, total - fee, destAddress.getOutputScript()));
+
+        PSBT psbt = new PSBT(transaction);
+        for(int i = 0; i < txOutputs.size(); i++) {
+            TransactionOutput utxoOutput = txOutputs.get(i);
+            TransactionInput txInput = transaction.getInputs().get(i);
+            PSBTInput psbtInput = psbt.getPsbtInputs().get(i);
+            psbtInput.setWitnessUtxo(utxoOutput);
+
+            if(ScriptType.P2SH.isScriptType(utxoOutput.getScript())) {
+                psbtInput.setRedeemScript(txInput.getScriptSig().getFirstNestedScript());
+            }
+
+            if(txInput.getWitness() != null) {
+                psbtInput.setWitnessScript(txInput.getWitness().getWitnessScript());
+            }
+
+            if(!psbtInput.sign(scriptType.getOutputKey(privKey))) {
+                AppServices.showErrorDialog("Failed to sign", "Failed to sign for transaction output " + utxoOutput.getHash() + ":" + utxoOutput.getIndex());
+                return;
+            }
+
+            TransactionSignature signature = psbtInput.isTaproot() ? psbtInput.getTapKeyPathSignature() : psbtInput.getPartialSignature(pubKey);
+
+            Transaction finalizeTransaction = new Transaction();
+            TransactionInput finalizedTxInput = scriptType.addSpendingInput(finalizeTransaction, utxoOutput, pubKey, signature);
+            psbtInput.setFinalScriptSig(finalizedTxInput.getScriptSig());
+            psbtInput.setFinalScriptWitness(finalizedTxInput.getWitness());
+        }
+
+        setResult(psbt.extractTransaction());
+    }
+
+    public Glyph getGlyph(FontAwesome5.Glyph glyphEnum) {
+        Glyph glyph = new Glyph(FontAwesome5.FONT_NAME, glyphEnum);
+        glyph.setFontSize(12);
+        return glyph;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java

@@ -37,6 +37,7 @@ public class FontAwesome5 extends GlyphFont {
         EYE('\uf06e'),
         FEATHER_ALT('\uf56b'),
         FILE_CSV('\uf6dd'),
+        FILE_IMPORT('\uf56f'),
         HAND_HOLDING('\uf4bd'),
         HAND_HOLDING_MEDICAL('\ue05c'),
         HAND_HOLDING_WATER('\uf4c1'),

src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java

@@ -6,13 +6,13 @@ import com.google.common.net.HostAndPort;
 import com.sparrowwallet.drongo.KeyPurpose;
 import com.sparrowwallet.drongo.Network;
 import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.protocol.*;
 import com.sparrowwallet.drongo.wallet.*;
 import com.sparrowwallet.sparrow.AppServices;
 import com.sparrowwallet.sparrow.EventManager;
 import com.sparrowwallet.sparrow.event.*;
 import com.sparrowwallet.sparrow.io.Config;
-import com.sparrowwallet.sparrow.wallet.SendController;
 import javafx.application.Platform;
 import javafx.beans.property.IntegerProperty;
 import javafx.beans.property.SimpleIntegerProperty;
@@ -847,6 +847,47 @@ public class ElectrumServer {
         return mempoolScriptHashes;
     }
 
+    public List<TransactionOutput> getUtxos(Address address) throws ServerException {
+        Wallet wallet = new Wallet(address.toString());
+        Map<String, String> pathScriptHashes = new HashMap<>();
+        pathScriptHashes.put("m/0", getScriptHash(address));
+        Map<String, ScriptHashTx[]> historyResult = electrumServerRpc.getScriptHashHistory(getTransport(), wallet, pathScriptHashes, true);
+        Set<String> txids = Arrays.stream(historyResult.get("m/0")).map(scriptHashTx -> scriptHashTx.tx_hash).collect(Collectors.toSet());
+
+        Map<String, String> transactionsResult = electrumServerRpc.getTransactions(getTransport(), wallet, txids);
+        List<TransactionOutput> transactionOutputs = new ArrayList<>();
+        Script outputScript = address.getOutputScript();
+        String strErrorTx = Sha256Hash.ZERO_HASH.toString();
+        List<Transaction> transactions = new ArrayList<>();
+        for(String txid : transactionsResult.keySet()) {
+            String strRawTx = transactionsResult.get(txid);
+
+            if(strRawTx.equals(strErrorTx)) {
+                continue;
+            }
+
+            try {
+                Transaction transaction = new Transaction(Utils.hexToBytes(strRawTx));
+                for(TransactionOutput txOutput : transaction.getOutputs()) {
+                    if(txOutput.getScript().equals(outputScript)) {
+                        transactionOutputs.add(txOutput);
+                    }
+                }
+                transactions.add(transaction);
+            } catch(ProtocolException e) {
+                log.error("Could not parse tx: " + strRawTx);
+            }
+        }
+
+        for(Transaction transaction : transactions) {
+            for(TransactionInput txInput : transaction.getInputs()) {
+                transactionOutputs.removeIf(txOutput -> txOutput.getHash().equals(txInput.getOutpoint().getHash()) && txOutput.getIndex() == txInput.getOutpoint().getIndex());
+            }
+        }
+
+        return transactionOutputs;
+    }
+
     public static Map<String, WalletNode> getAllScriptHashes(Wallet wallet) {
         Map<String, WalletNode> scriptHashes = new HashMap<>();
         for(KeyPurpose keyPurpose : KeyPurpose.DEFAULT_PURPOSES) {
@@ -870,6 +911,12 @@ public class ElectrumServer {
         return Utils.bytesToHex(reversed);
     }
 
+    public static String getScriptHash(Address address) {
+        byte[] hash = Sha256Hash.hash(address.getOutputScript().getProgram());
+        byte[] reversed = Utils.reverseBytes(hash);
+        return Utils.bytesToHex(reversed);
+    }
+
     public static Map<String, List<String>> getSubscribedScriptHashes() {
         return subscribedScriptHashes;
     }
@@ -1038,7 +1085,7 @@ public class ElectrumServer {
 
                         String banner = electrumServer.getServerBanner();
 
-                        Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(SendController.TARGET_BLOCKS_RANGE);
+                        Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(AppServices.TARGET_BLOCKS_RANGE);
                         Set<MempoolRateSize> mempoolRateSizes = electrumServer.getMempoolRateSizes();
                         feeRatesRetrievedAt = System.currentTimeMillis();
 
@@ -1054,7 +1101,7 @@ public class ElectrumServer {
 
                             long elapsed = System.currentTimeMillis() - feeRatesRetrievedAt;
                             if(elapsed > FEE_RATES_PERIOD) {
-                                Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(SendController.TARGET_BLOCKS_RANGE);
+                                Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(AppServices.TARGET_BLOCKS_RANGE);
                                 Set<MempoolRateSize> mempoolRateSizes = electrumServer.getMempoolRateSizes();
                                 feeRatesRetrievedAt = System.currentTimeMillis();
                                 return new FeeRatesUpdatedEvent(blockTargetFeeRates, mempoolRateSizes);
@@ -1430,7 +1477,7 @@ public class ElectrumServer {
             return new Task<>() {
                 protected FeeRatesUpdatedEvent call() throws ServerException {
                     ElectrumServer electrumServer = new ElectrumServer();
-                    Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(SendController.TARGET_BLOCKS_RANGE);
+                    Map<Integer, Double> blockTargetFeeRates = electrumServer.getFeeEstimates(AppServices.TARGET_BLOCKS_RANGE);
                     Set<MempoolRateSize> mempoolRateSizes = electrumServer.getMempoolRateSizes();
                     return new FeeRatesUpdatedEvent(blockTargetFeeRates, mempoolRateSizes);
                 }
@@ -1481,4 +1528,22 @@ public class ElectrumServer {
             };
         }
     }
+
+    public static class AddressUtxosService extends Service<List<TransactionOutput>> {
+        private final Address address;
+
+        public AddressUtxosService(Address address) {
+            this.address = address;
+        }
+
+        @Override
+        protected Task<List<TransactionOutput>> createTask() {
+            return new Task<>() {
+                protected List<TransactionOutput> call() throws ServerException {
+                    ElectrumServer electrumServer = new ElectrumServer();
+                    return electrumServer.getUtxos(address);
+                }
+            };
+        }
+    }
 }

src/main/java/com/sparrowwallet/sparrow/wallet/SendController.java

@@ -4,7 +4,6 @@ import com.google.common.eventbus.Subscribe;
 import com.samourai.whirlpool.client.whirlpool.beans.Pool;
 import com.sparrowwallet.drongo.BitcoinUnit;
 import com.sparrowwallet.drongo.KeyPurpose;
-import com.sparrowwallet.drongo.Network;
 import com.sparrowwallet.drongo.address.InvalidAddressException;
 import com.sparrowwallet.drongo.protocol.Sha256Hash;
 import com.sparrowwallet.drongo.protocol.Transaction;
@@ -60,14 +59,11 @@ import java.text.DecimalFormatSymbols;
 import java.util.*;
 import java.util.stream.Collectors;
 
+import static com.sparrowwallet.sparrow.AppServices.*;
+
 public class SendController extends WalletFormController implements Initializable {
     private static final Logger log = LoggerFactory.getLogger(SendController.class);
 
-    public static final List<Integer> TARGET_BLOCKS_RANGE = List.of(1, 2, 3, 4, 5, 10, 25, 50);
-    public static final List<Long> FEE_RATES_RANGE = List.of(1L, 2L, 4L, 8L, 16L, 32L, 64L, 128L, 256L, 512L, 1024L);
-
-    public static final double FALLBACK_FEE_RATE = 20000d / 1000;
-
     @FXML
     private TabPane paymentTabs;
 

src/main/resources/com/sparrowwallet/sparrow/app.fxml

@@ -110,6 +110,7 @@
                 <Menu fx:id="toolsMenu" mnemonicParsing="false" text="Tools">
                     <MenuItem mnemonicParsing="false" text="Sign/Verify Message" accelerator="Shortcut+M" onAction="#signVerifyMessage"/>
                     <MenuItem fx:id="sendToMany" mnemonicParsing="false" text="Send To Many" onAction="#sendToMany"/>
+                    <MenuItem fx:id="sweepPrivateKey" mnemonicParsing="false" text="Sweep Private Key" onAction="#sweepPrivateKey"/>
                     <SeparatorMenuItem />
                     <MenuItem fx:id="findMixingPartner" mnemonicParsing="false" text="Find Mix Partner" onAction="#findMixingPartner"/>
                     <MenuItem fx:id="showPayNym" mnemonicParsing="false" text="Show PayNym" onAction="#showPayNym"/>

src/main/resources/com/sparrowwallet/sparrow/dialog.css

@@ -0,0 +1,10 @@
+.root.dialog-pane .header-panel {
+    -fx-background-color: -fx-control-inner-background;
+    -fx-border-width: 0px 0px 1px 0px;
+    -fx-border-color: #e5e5e6;
+}
+
+.header-panel .label {
+    -fx-font-size: 24px;
+}
+