add support for bbqr encoding and decoding

build.gradle

@@ -134,6 +134,7 @@ dependencies {
     implementation('net.coobird:thumbnailator:0.4.18')
     implementation('com.github.hervegirod:fxsvgimage:1.0b2')
     implementation('com.sparrowwallet:toucan:0.9.0')
+    implementation('com.jcraft:jzlib:1.1.3')
     testImplementation('org.junit.jupiter:junit-jupiter-api:5.10.0')
     testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.10.0')
     testRuntimeOnly('org.junit.platform:junit-platform-launcher')
@@ -715,4 +716,7 @@ extraJavaModuleInfo {
         requires('org.bouncycastle.pg')
         requires('org.slf4j')
     }
+    module('jzlib-1.1.3.jar', 'com.jcraft.jzlib', '1.1.3') {
+        exports('com.jcraft.jzlib')
+    }
 }

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

@@ -100,7 +100,7 @@ public class DownloadVerifierDialog extends Dialog<ButtonBar.ButtonData> {
         releaseLink.setOnAction(event -> {
             if(release.get() != null && release.get().exists()) {
                 if(release.get().getName().toLowerCase(Locale.ROOT).startsWith("sparrow")) {
-                    Optional<ButtonType> optType = AppServices.showAlertDialog("Close Sparrow?", "Close Sparrow before installing?", Alert.AlertType.CONFIRMATION, ButtonType.NO, ButtonType.YES);
+                    Optional<ButtonType> optType = AppServices.showAlertDialog("Exit Sparrow?", "Sparrow must be closed before installation. Exit?", Alert.AlertType.CONFIRMATION, ButtonType.NO, ButtonType.YES);
                     if(optType.isPresent() && optType.get() == ButtonType.YES) {
                         javafx.application.Platform.exit();
                         AppServices.get().getApplication().getHostServices().showDocument("file://" + release.get().getAbsolutePath());

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

@@ -1,22 +1,28 @@
 package com.sparrowwallet.sparrow.control;
 
 public enum QRDensity {
-    NORMAL("Normal", 400),
+    NORMAL("Normal", 400, 2000),
-    LOW("Low", 80);
+    LOW("Low", 80, 1000);
 
     private final String name;
-    private final int maxFragmentLength;
+    private final int maxUrFragmentLength;
+    private final int maxBbqrFragmentLength;
 
-    QRDensity(String name, int maxFragmentLength) {
+    QRDensity(String name, int maxUrFragmentLength, int maxBbqrFragmentLength) {
         this.name = name;
-        this.maxFragmentLength = maxFragmentLength;
+        this.maxUrFragmentLength = maxUrFragmentLength;
+        this.maxBbqrFragmentLength = maxBbqrFragmentLength;
     }
 
     public String getName() {
         return name;
     }
 
-    public int getMaxFragmentLength() {
+    public int getMaxUrFragmentLength() {
-        return maxFragmentLength;
+        return maxUrFragmentLength;
+    }
+
+    public int getMaxBbqrFragmentLength() {
+        return maxBbqrFragmentLength;
     }
 }

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

@@ -14,6 +14,9 @@ import com.sparrowwallet.sparrow.io.Config;
 import com.sparrowwallet.sparrow.io.ImportException;
 import com.sparrowwallet.hummingbird.UR;
 import com.sparrowwallet.hummingbird.UREncoder;
+import com.sparrowwallet.sparrow.io.bbqr.BBQR;
+import com.sparrowwallet.sparrow.io.bbqr.BBQREncoder;
+import com.sparrowwallet.sparrow.io.bbqr.BBQREncoding;
 import javafx.concurrent.ScheduledService;
 import javafx.concurrent.Task;
 import javafx.scene.Node;
@@ -44,10 +47,16 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
     private static final int DEFAULT_QR_SIZE = 580;
     private static final int REDUCED_QR_SIZE = 520;
 
+    private static final BBQREncoding DEFAULT_BBQR_ENCODING = BBQREncoding.ZLIB;
+
     private final int qrSize = getQRSize();
 
     private final UR ur;
-    private UREncoder encoder;
+    private UREncoder urEncoder;
+
+    private final BBQR bbqr;
+    private BBQREncoder bbqrEncoder;
+    private boolean useBbqrEncoding;
 
     private final ImageView qrImageView;
 
@@ -62,17 +71,26 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
     private static boolean initialDensityChange;
 
     public QRDisplayDialog(String type, byte[] data, boolean addLegacyEncodingOption) throws UR.URException {
-        this(UR.fromBytes(type, data), addLegacyEncodingOption, false);
+        this(UR.fromBytes(type, data), null, addLegacyEncodingOption, false, false);
     }
 
     public QRDisplayDialog(UR ur) {
-        this(ur, false, false);
+        this(ur, null, false, false, false);
     }
 
-    public QRDisplayDialog(UR ur, boolean addLegacyEncodingOption, boolean addScanButton) {
+    public QRDisplayDialog(UR ur, BBQR bbqr, boolean addLegacyEncodingOption, boolean addScanButton, boolean selectBbqrButton) {
         this.ur = ur;
-        this.addLegacyEncodingOption = addLegacyEncodingOption;
+        this.bbqr = bbqr;
-        this.encoder = new UREncoder(ur, Config.get().getQrDensity().getMaxFragmentLength(), MIN_FRAGMENT_LENGTH, 0);
+        this.addLegacyEncodingOption = bbqr == null && addLegacyEncodingOption;
+
+        this.urEncoder = new UREncoder(ur, Config.get().getQrDensity().getMaxUrFragmentLength(), MIN_FRAGMENT_LENGTH, 0);
+
+        if(bbqr != null) {
+            this.bbqrEncoder = new BBQREncoder(bbqr.type(), DEFAULT_BBQR_ENCODING, bbqr.data(), Config.get().getQrDensity().getMaxBbqrFragmentLength(), 0);
+            if(selectBbqrButton) {
+                useBbqrEncoding = true;
+            }
+        }
 
         final DialogPane dialogPane = new QRDisplayDialogPane();
         setDialogPane(dialogPane);
@@ -85,7 +103,7 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
         dialogPane.setContent(Borders.wrap(stackPane).lineBorder().buildAll());
 
         nextPart();
-        if(encoder.isSinglePart()) {
+        if(isSinglePart()) {
             qrImageView.setImage(getQrCode(currentPart));
         } else {
             createAnimateQRService();
@@ -94,7 +112,7 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
         final ButtonType cancelButtonType = new javafx.scene.control.ButtonType("Close", ButtonBar.ButtonData.CANCEL_CLOSE);
         dialogPane.getButtonTypes().add(cancelButtonType);
 
-        if(addLegacyEncodingOption) {
+        if(this.addLegacyEncodingOption) {
             final ButtonType legacyEncodingButtonType = new javafx.scene.control.ButtonType("Use Legacy Encoding (Cobo Vault)", ButtonBar.ButtonData.LEFT);
             dialogPane.getButtonTypes().add(legacyEncodingButtonType);
         } else {
@@ -102,8 +120,13 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
             dialogPane.getButtonTypes().add(densityButtonType);
         }
 
+        if(bbqr != null) {
+            final ButtonType bbqrButtonType = new javafx.scene.control.ButtonType("Show BBQr", ButtonBar.ButtonData.BACK_PREVIOUS);
+            dialogPane.getButtonTypes().add(bbqrButtonType);
+        }
+
         if(addScanButton) {
-            final ButtonType scanButtonType = new javafx.scene.control.ButtonType("Scan QR", ButtonBar.ButtonData.NEXT_FORWARD);
+            final ButtonType scanButtonType = new javafx.scene.control.ButtonType("Scan QR", ButtonBar.ButtonData.OK_DONE);
             dialogPane.getButtonTypes().add(scanButtonType);
         }
 
@@ -121,7 +144,9 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
 
     public QRDisplayDialog(String data, boolean addScanButton) {
         this.ur = null;
-        this.encoder = null;
+        this.bbqr = null;
+        this.urEncoder = null;
+        this.bbqrEncoder = null;
 
         final DialogPane dialogPane = new QRDisplayDialogPane();
         setDialogPane(dialogPane);
@@ -138,7 +163,7 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
         dialogPane.getButtonTypes().addAll(cancelButtonType);
 
         if(addScanButton) {
-            final ButtonType scanButtonType = new javafx.scene.control.ButtonType("Scan QR", ButtonBar.ButtonData.NEXT_FORWARD);
+            final ButtonType scanButtonType = new javafx.scene.control.ButtonType("Scan QR", ButtonBar.ButtonData.OK_DONE);
             dialogPane.getButtonTypes().add(scanButtonType);
         }
 
@@ -163,9 +188,22 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
         });
     }
 
+    private boolean isSinglePart() {
+        if(useBbqrEncoding) {
+            return bbqrEncoder.isSinglePart();
+        } else if(!useLegacyEncoding) {
+            return urEncoder.isSinglePart();
+        } else {
+            return legacyParts.length == 1;
+        }
+    }
+
     private void nextPart() {
-        if(!useLegacyEncoding) {
+        if(useBbqrEncoding) {
-            String fragment = encoder.nextPart();
+            String fragment = bbqrEncoder.nextPart();
+            currentPart = fragment.toUpperCase(Locale.ROOT);
+        } else if(!useLegacyEncoding) {
+            String fragment = urEncoder.nextPart();
             currentPart = fragment.toUpperCase(Locale.ROOT);
         } else {
             currentPart = legacyParts[legacyPartIndex];
@@ -201,37 +239,23 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
                 this.legacyParts = legacyEncoder.encode();
                 this.useLegacyEncoding = true;
 
-                if(legacyParts.length == 1) {
+                restartAnimation();
-                    if(animateQRService != null) {
-                        animateQRService.cancel();
-                    }
-
-                    nextPart();
-                    qrImageView.setImage(getQrCode(currentPart));
-                } else if(animateQRService == null) {
-                    createAnimateQRService();
-                } else if(!animateQRService.isRunning()) {
-                    animateQRService.reset();
-                    animateQRService.start();
-                }
             } catch(UR.InvalidTypeException e) {
                 //Can't happen
             }
         } else {
             this.useLegacyEncoding = false;
+            restartAnimation();
+        }
+    }
 
-            if(encoder.isSinglePart()) {
+    private void setUseBbqrEncoding(boolean useBbqrEncoding) {
-                if(animateQRService != null) {
+        if(useBbqrEncoding) {
-                    animateQRService.cancel();
+            this.useBbqrEncoding = true;
-                }
+            restartAnimation();
-
+        } else {
-                qrImageView.setImage(getQrCode(currentPart));
+            this.useBbqrEncoding = false;
-            } else if(animateQRService == null) {
+            restartAnimation();
-                createAnimateQRService();
-            } else if(!animateQRService.isRunning()) {
-                animateQRService.reset();
-                animateQRService.start();
-            }
         }
     }
 
@@ -240,12 +264,28 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
             animateQRService.cancel();
         }
 
-        this.encoder = new UREncoder(ur, Config.get().getQrDensity().getMaxFragmentLength(), MIN_FRAGMENT_LENGTH, 0);
+        if(bbqr != null) {
-        nextPart();
+            this.bbqrEncoder = new BBQREncoder(bbqr.type(), DEFAULT_BBQR_ENCODING, bbqr.data(), Config.get().getQrDensity().getMaxBbqrFragmentLength(), 0);
-        if(encoder.isSinglePart()) {
+        }
+
+        this.urEncoder = new UREncoder(ur, Config.get().getQrDensity().getMaxUrFragmentLength(), MIN_FRAGMENT_LENGTH, 0);
+
+        restartAnimation();
+    }
+
+    private void restartAnimation() {
+        if(isSinglePart()) {
+            if(animateQRService != null) {
+                animateQRService.cancel();
+            }
+
+            nextPart();
             qrImageView.setImage(getQrCode(currentPart));
-        } else {
+        } else if(animateQRService == null) {
             createAnimateQRService();
+        } else if(!animateQRService.isRunning()) {
+            animateQRService.reset();
+            animateQRService.start();
         }
     }
 
@@ -290,7 +330,7 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
                     final ButtonBar.ButtonData buttonData = buttonType.getButtonData();
                     ButtonBar.setButtonData(density, buttonData);
                     density.setOnAction(event -> {
-                        if(!initialDensityChange && !encoder.isSinglePart()) {
+                        if(!initialDensityChange && !isSinglePart()) {
                             Optional<ButtonType> optButtonType = AppServices.showWarningDialog("Discard progress?", "Changing the QR code density means any progress on the receiving device must be discarded. Proceed?", ButtonType.NO, ButtonType.YES);
                             if(optButtonType.isPresent() && optButtonType.get() == ButtonType.YES) {
                                 initialDensityChange = true;
@@ -306,12 +346,25 @@ public class QRDisplayDialog extends Dialog<ButtonType> {
 
                     return density;
                 }
-            } else if(buttonType.getButtonData() == ButtonBar.ButtonData.NEXT_FORWARD) {
+            } else if(buttonType.getButtonData() == ButtonBar.ButtonData.OK_DONE) {
                 Button scanButton = (Button)super.createButton(buttonType);
                 scanButton.setGraphicTextGap(5);
                 scanButton.setGraphic(getGlyph(FontAwesome5.Glyph.CAMERA));
 
                 return scanButton;
+            } else if(buttonType.getButtonData() == ButtonBar.ButtonData.BACK_PREVIOUS) {
+                ToggleButton bbqr = new ToggleButton(buttonType.getText());
+                bbqr.setGraphicTextGap(5);
+                bbqr.setGraphic(getGlyph(FontAwesome5.Glyph.QRCODE));
+                bbqr.setSelected(useBbqrEncoding);
+                final ButtonBar.ButtonData buttonData = buttonType.getButtonData();
+                ButtonBar.setButtonData(bbqr, buttonData);
+
+                bbqr.selectedProperty().addListener((observable, oldValue, newValue) -> {
+                    setUseBbqrEncoding(newValue);
+                });
+
+                return bbqr;
             }
 
             return super.createButton(buttonType);

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

@@ -30,6 +30,8 @@ import com.sparrowwallet.hummingbird.registry.pathcomponent.PathComponent;
 import com.sparrowwallet.sparrow.AppServices;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.io.Config;
+import com.sparrowwallet.sparrow.io.bbqr.BBQRDecoder;
+import com.sparrowwallet.sparrow.io.bbqr.BBQRException;
 import javafx.application.Platform;
 import javafx.beans.property.DoubleProperty;
 import javafx.beans.property.ObjectProperty;
@@ -63,8 +65,9 @@ import java.util.stream.IntStream;
 public class QRScanDialog extends Dialog<QRScanDialog.Result> {
     private static final Logger log = LoggerFactory.getLogger(QRScanDialog.class);
 
-    private final URDecoder decoder;
+    private final URDecoder urDecoder;
-    private final LegacyURDecoder legacyDecoder;
+    private final LegacyURDecoder legacyUrDecoder;
+    private final BBQRDecoder bbqrDecoder;
     private final WebcamService webcamService;
     private List<String> parts;
 
@@ -80,8 +83,9 @@ public class QRScanDialog extends Dialog<QRScanDialog.Result> {
     private final ObjectProperty<WebcamDevice> webcamDeviceProperty = new SimpleObjectProperty<>();
 
     public QRScanDialog() {
-        this.decoder = new URDecoder();
+        this.urDecoder = new URDecoder();
-        this.legacyDecoder = new LegacyURDecoder();
+        this.legacyUrDecoder = new LegacyURDecoder();
+        this.bbqrDecoder = new BBQRDecoder();
 
         if(Config.get().isHdCapture()) {
             webcamResolutionProperty.set(WebcamResolution.HD);
@@ -192,23 +196,23 @@ public class QRScanDialog extends Dialog<QRScanDialog.Result> {
 
             if(qrtext.toLowerCase(Locale.ROOT).startsWith(UR.UR_PREFIX)) {
                 if(LegacyURDecoder.isLegacyURFragment(qrtext)) {
-                    legacyDecoder.receivePart(qrtext);
+                    legacyUrDecoder.receivePart(qrtext);
-                    Platform.runLater(() -> percentComplete.setValue(legacyDecoder.getPercentComplete()));
+                    Platform.runLater(() -> percentComplete.setValue(legacyUrDecoder.getPercentComplete()));
 
-                    if(legacyDecoder.isComplete()) {
+                    if(legacyUrDecoder.isComplete()) {
                         try {
-                            UR ur = legacyDecoder.decode();
+                            UR ur = legacyUrDecoder.decode();
                             result = extractResultFromUR(ur);
                         } catch(Exception e) {
                             result = new Result(new URException(e.getMessage()));
                         }
                     }
                 } else {
-                    decoder.receivePart(qrtext);
+                    urDecoder.receivePart(qrtext);
-                    Platform.runLater(() -> percentComplete.setValue(decoder.getProcessedPartsCount() > 0 ? decoder.getEstimatedPercentComplete() : 0));
+                    Platform.runLater(() -> percentComplete.setValue(urDecoder.getProcessedPartsCount() > 0 ? urDecoder.getEstimatedPercentComplete() : 0));
 
-                    if(decoder.getResult() != null) {
+                    if(urDecoder.getResult() != null) {
-                        URDecoder.Result urResult = decoder.getResult();
+                        URDecoder.Result urResult = urDecoder.getResult();
                         if(urResult.type == ResultType.SUCCESS) {
                             result = extractResultFromUR(urResult.ur);
                             Platform.runLater(() -> setResult(result));
@@ -217,6 +221,19 @@ public class QRScanDialog extends Dialog<QRScanDialog.Result> {
                         }
                     }
                 }
+            } else if(BBQRDecoder.isBBQRFragment(qrtext)) {
+                bbqrDecoder.receivePart(qrtext);
+                Platform.runLater(() -> percentComplete.setValue(bbqrDecoder.getPercentComplete()));
+
+                if(bbqrDecoder.getResult() != null) {
+                    BBQRDecoder.Result bbqrResult = bbqrDecoder.getResult();
+                    if(bbqrResult.getResultType() == BBQRDecoder.ResultType.SUCCESS) {
+                        result = extractResultFromBBQR(bbqrResult);
+                        Platform.runLater(() -> setResult(result));
+                    } else {
+                        result = new Result(new BBQRException(bbqrResult.getError()));
+                    }
+                }
             } else if(partMatcher.matches()) {
                 int m = Integer.parseInt(partMatcher.group(1));
                 int n = Integer.parseInt(partMatcher.group(2));
@@ -651,6 +668,19 @@ public class QRScanDialog extends Dialog<QRScanDialog.Result> {
 
             return wallets;
         }
+
+        private Result extractResultFromBBQR(BBQRDecoder.Result result) {
+            if(result.getPsbt() != null) {
+                return new Result(result.getPsbt());
+            } else if(result.getTransaction() != null) {
+                return new Result(result.getTransaction());
+            } else if(result.toString() != null) {
+                return new Result(result.toString());
+            } else {
+                log.error("Unsupported BBQR type " + result.getBbqrType());
+                return new Result(new URException("BBQR type " + result.getBbqrType() + " is not supported"));
+            }
+        }
     }
 
     private class QRScanListener implements WebcamListener {

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQR.java

@@ -0,0 +1,3 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+public record BBQR(BBQRType type, byte[] data) {}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQRDecoder.java

@@ -0,0 +1,180 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import com.sparrowwallet.drongo.protocol.Transaction;
+import com.sparrowwallet.drongo.psbt.PSBT;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+import java.util.TreeMap;
+
+public class BBQRDecoder {
+    private static final Logger log = LoggerFactory.getLogger(BBQRDecoder.class);
+
+    private final Map<Integer, byte[]> receivedParts = new TreeMap<>();
+    private int totalParts;
+
+    private BBQRType type;
+    private Result result;
+
+    public static boolean isBBQRFragment(String part) {
+        try {
+            BBQRHeader.fromString(part);
+            return true;
+        } catch(Exception e) {
+            return false;
+        }
+    }
+
+    public void receivePart(String part) {
+        try {
+            BBQRHeader header = BBQRHeader.fromString(part);
+            totalParts = header.seqTotal();
+            type = header.type();
+            byte[] partData = header.decode(part);
+            receivedParts.put(header.seqNumber(), partData);
+
+            if(receivedParts.size() == totalParts) {
+                byte[] data = concatParts();
+
+                if(type == BBQRType.PSBT) {
+                    result = new Result(new PSBT(data));
+                } else if(type == BBQRType.TXN) {
+                    result = new Result(new Transaction(data));
+                } else if(type == BBQRType.JSON || type == BBQRType.UNICODE) {
+                    result = new Result(type, new String(data, StandardCharsets.UTF_8));
+                } else {
+                    result = new Result(type, data);
+                }
+            }
+        } catch(Exception e) {
+            log.error("Could not parse received QR of type " + type, e);
+            result = new Result(ResultType.FAILURE, e.getMessage());
+        }
+    }
+
+    private byte[] concatParts() {
+        int totalLength = 0;
+        for(byte[] part : receivedParts.values()) {
+            totalLength += part.length;
+        }
+
+        byte[] data = new byte[totalLength];
+        int index = 0;
+        for(byte[] part : receivedParts.values()) {
+            System.arraycopy(part, 0, data, index, part.length);
+            index += part.length;
+        }
+
+        return data;
+    }
+
+    public int getProcessedPartsCount() {
+        return receivedParts.size();
+    }
+
+    public double getPercentComplete() {
+        if(totalParts == 0) {
+            return 0d;
+        }
+
+        return (double)getProcessedPartsCount() / totalParts;
+    }
+
+    public Result getResult() {
+        return result;
+    }
+
+    public static class Result {
+        private final ResultType resultType;
+        private final BBQRType bbqrType;
+        private final PSBT psbt;
+        private final Transaction transaction;
+        private final String strData;
+        private final byte[] data;
+        private final String error;
+
+        public Result(ResultType resultType, String error) {
+            this.resultType = resultType;
+            this.bbqrType = null;
+            this.psbt = null;
+            this.transaction = null;
+            this.strData = null;
+            this.data = null;
+            this.error = error;
+        }
+
+        public Result(PSBT psbt) {
+            this.resultType = ResultType.SUCCESS;
+            this.bbqrType = BBQRType.PSBT;
+            this.psbt = psbt;
+            this.transaction = null;
+            this.strData = null;
+            this.data = null;
+            this.error = null;
+        }
+
+        public Result(Transaction transaction) {
+            this.resultType = ResultType.SUCCESS;
+            this.bbqrType = BBQRType.TXN;
+            this.psbt = null;
+            this.transaction = transaction;
+            this.strData = null;
+            this.data = null;
+            this.error = null;
+        }
+
+        public Result(BBQRType bbqrType, String strData) {
+            this.resultType = ResultType.SUCCESS;
+            this.bbqrType = bbqrType;
+            this.psbt = null;
+            this.transaction = null;
+            this.strData = strData;
+            this.data = null;
+            this.error = null;
+        }
+
+        public Result(BBQRType bbqrType, byte[] data) {
+            this.resultType = ResultType.SUCCESS;
+            this.bbqrType = bbqrType;
+            this.psbt = null;
+            this.transaction = null;
+            this.strData = null;
+            this.data = data;
+            this.error = null;
+        }
+
+        public ResultType getResultType() {
+            return resultType;
+        }
+
+        public BBQRType getBbqrType() {
+            return bbqrType;
+        }
+
+        public PSBT getPsbt() {
+            return psbt;
+        }
+
+        public Transaction getTransaction() {
+            return transaction;
+        }
+
+        public byte[] getData() {
+            return data;
+        }
+
+        public String toString() {
+            return strData;
+        }
+
+        public String getError() {
+            return error;
+        }
+    }
+
+    public enum ResultType {
+        SUCCESS, FAILURE;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncoder.java

@@ -0,0 +1,71 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BBQREncoder {
+    private final String[] parts;
+    private int partIndex;
+
+    public BBQREncoder(BBQRType bbqrType, BBQREncoding bbqrEncoding, byte[] data, int maxFragmentLength, int firstSeqNum) {
+        this.parts = encode(bbqrType, bbqrEncoding, data, maxFragmentLength).toArray(new String[0]);
+        this.partIndex = firstSeqNum;
+    }
+
+    public boolean isSinglePart() {
+        return parts.length == 1;
+    }
+
+    public String nextPart() {
+        String currentPart = parts[partIndex];
+        partIndex++;
+        if(partIndex > parts.length - 1) {
+            partIndex = 0;
+        }
+
+        return currentPart;
+    }
+
+    public int getNumParts() {
+        return parts.length;
+    }
+
+    private List<String> encode(BBQRType type, BBQREncoding desiredEncoding, byte[] data, int desiredChunkSize) {
+        String encoded;
+        BBQREncoding encoding = desiredEncoding;
+
+        try {
+            encoded = encoding.encode(data);
+            if(encoding == BBQREncoding.ZLIB) {
+                String uncompressed = BBQREncoding.BASE32.encode(data);
+                if(encoded.length() > uncompressed.length()) {
+                    throw new BBQREncodingException("Compressed data was larger than uncompressed data");
+                }
+            }
+        } catch(BBQREncodingException e) {
+            encoding = BBQREncoding.BASE32;
+            encoded = BBQREncoding.BASE32.encode(data);
+        }
+
+        int inputLength = encoded.length();
+        int numChunks = (inputLength + desiredChunkSize - 1) / desiredChunkSize;
+        int chunkSize = numChunks == 1 ? desiredChunkSize : (int)Math.ceil((double)inputLength / numChunks);
+
+        int modulo = chunkSize % encoding.getPartModulo();
+        if(modulo > 0) {
+            chunkSize += (encoding.getPartModulo() - modulo);
+        }
+
+        List<String> chunks = new ArrayList<>();
+        int startIndex = 0;
+        for(int i = 0; i < numChunks; i ++) {
+            int endIndex = Math.min(startIndex + chunkSize, encoded.length());
+            BBQRHeader bbqrHeader = new BBQRHeader(encoding, type, numChunks, i);
+            String chunk = bbqrHeader + encoded.substring(startIndex, endIndex);
+            startIndex = endIndex;
+            chunks.add(chunk);
+        }
+
+        return chunks;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncoding.java

@@ -0,0 +1,104 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import com.google.common.io.BaseEncoding;
+import com.jcraft.jzlib.*;
+import com.sparrowwallet.drongo.Utils;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.util.Locale;
+
+public enum BBQREncoding {
+    HEX("H") {
+        @Override
+        public String encode(byte[] data) throws BBQREncodingException {
+            return Utils.bytesToHex(data).toUpperCase(Locale.ROOT);
+        }
+
+        @Override
+        public byte[] decode(String part) throws BBQREncodingException {
+            return Utils.hexToBytes(part);
+        }
+
+        @Override
+        public int getPartModulo() {
+            return 2;
+        }
+    }, BASE32("2") {
+        @Override
+        public String encode(byte[] data) throws BBQREncodingException {
+            return BaseEncoding.base32().encode(data).replaceAll("=+$", "");
+        }
+
+        @Override
+        public byte[] decode(String part) throws BBQREncodingException {
+            return BaseEncoding.base32().decode(part);
+        }
+
+        @Override
+        public int getPartModulo() {
+            return 8;
+        }
+    }, ZLIB("Z") {
+        @Override
+        public String encode(byte[] data) throws BBQREncodingException {
+            try {
+                Deflater deflater = new Deflater(JZlib.Z_BEST_COMPRESSION, 10, true);
+                ByteArrayOutputStream out = new ByteArrayOutputStream();
+                DeflaterOutputStream zOut = new DeflaterOutputStream(out, deflater);
+                zOut.write(data);
+                zOut.close();
+
+                return BASE32.encode(out.toByteArray());
+            } catch(Exception e) {
+                throw new BBQREncodingException("Error deflating with zlib", e);
+            }
+        }
+
+        @Override
+        public byte[] decode(String part) throws BBQREncodingException {
+            try {
+                Inflater inflater = new Inflater(10, true);
+                ByteArrayInputStream in = new ByteArrayInputStream(BASE32.decode(part));
+                InflaterInputStream zIn = new InflaterInputStream(in, inflater);
+                byte[] decoded = zIn.readAllBytes();
+                zIn.close();
+
+                return decoded;
+            } catch(Exception e) {
+                throw new BBQREncodingException("Error inflating with zlib", e);
+            }
+        }
+
+        @Override
+        public int getPartModulo() {
+            return 8;
+        }
+    };
+
+    public static BBQREncoding fromString(String code) {
+        for(BBQREncoding encoding : values()) {
+            if(encoding.getCode().equals(code)) {
+                return encoding;
+            }
+        }
+
+        throw new IllegalArgumentException("Could not find encoding for code " + code);
+    }
+
+    private final String code;
+
+    BBQREncoding(String code) {
+        this.code = code;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public abstract String encode(byte[] data) throws BBQREncodingException;
+
+    public abstract byte[] decode(String part) throws BBQREncodingException;
+
+    public abstract int getPartModulo();
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncodingException.java

@@ -0,0 +1,11 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+public class BBQREncodingException extends BBQRException {
+    public BBQREncodingException(String message) {
+        super(message);
+    }
+
+    public BBQREncodingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQRException.java

@@ -0,0 +1,11 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+public class BBQRException extends RuntimeException {
+    public BBQRException(String message) {
+        super(message);
+    }
+
+    public BBQRException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQRHeader.java

@@ -0,0 +1,40 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import java.math.BigInteger;
+
+public record BBQRHeader(BBQREncoding encoding, BBQRType type, int seqTotal, int seqNumber) {
+    public static final String HEADER = "B$";
+
+    public String toString() {
+        return HEADER + encoding.getCode() + type.getCode() + encodeToBase36(seqTotal) + encodeToBase36(seqNumber);
+    }
+
+    public byte[] decode(String part) {
+        return encoding.decode(part.substring(8));
+    }
+
+    public static BBQRHeader fromString(String part) {
+        if(part.length() < 8) {
+            throw new IllegalArgumentException("Part too short");
+        }
+
+        if(!HEADER.equals(part.substring(0, 2))) {
+            throw new IllegalArgumentException("Part does not start with " + HEADER);
+        }
+
+        BBQREncoding e = BBQREncoding.fromString(part.substring(2, 3));
+        BBQRType t = BBQRType.fromString(part.substring(3, 4));
+
+        return new BBQRHeader(e, t, decodeFromBase36(part.substring(4, 6)), decodeFromBase36(part.substring(6, 8)));
+    }
+
+    private String encodeToBase36(int number) {
+        String base36Encoded = new BigInteger(String.valueOf(number)).toString(36);
+        return String.format("%2s", base36Encoded).replace(' ', '0');
+    }
+
+    private static int decodeFromBase36(String base36) {
+        BigInteger bigInteger = new BigInteger(base36, 36);
+        return bigInteger.intValue();
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQRType.java

@@ -0,0 +1,25 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+public enum BBQRType {
+    PSBT("P"), TXN("T"), JSON("J"), CBOR("C"), UNICODE("U"), BINARY("B"), EXECUTABLE("X");
+
+    private final String code;
+
+    BBQRType(String code) {
+        this.code = code;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public static BBQRType fromString(String code) {
+        for(BBQRType type : values()) {
+            if(type.getCode().equals(code)) {
+                return type;
+            }
+        }
+
+        throw new IllegalArgumentException("Could not find type for code " + code);
+    }
+}

src/main/java/com/sparrowwallet/sparrow/transaction/HeadersController.java

@@ -19,6 +19,8 @@ import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5Brands;
 import com.sparrowwallet.sparrow.io.Config;
 import com.sparrowwallet.sparrow.io.Device;
+import com.sparrowwallet.sparrow.io.bbqr.BBQR;
+import com.sparrowwallet.sparrow.io.bbqr.BBQRType;
 import com.sparrowwallet.sparrow.net.ElectrumServer;
 import com.sparrowwallet.sparrow.io.Storage;
 import com.sparrowwallet.sparrow.payjoin.Payjoin;
@@ -902,16 +904,21 @@ public class HeadersController extends TransactionFormController implements Init
         ToggleButton toggleButton = (ToggleButton)event.getSource();
         toggleButton.setSelected(false);
 
-        //TODO: Remove once Cobo Vault has upgraded to UR2.0
+        //TODO: Remove once Cobo Vault support has been removed
         boolean addLegacyEncodingOption = headersForm.getSigningWallet().getKeystores().stream().anyMatch(keystore -> keystore.getWalletModel().equals(WalletModel.COBO_VAULT));
+        boolean addBbqrOption = headersForm.getSigningWallet().getKeystores().stream().anyMatch(keystore -> keystore.getWalletModel().equals(WalletModel.COLDCARD) || keystore.getSource().equals(KeystoreSource.SW_WATCH));
+        boolean selectBbqrOption = headersForm.getSigningWallet().getKeystores().stream().allMatch(keystore -> keystore.getWalletModel().equals(WalletModel.COLDCARD));
 
         //Don't include non witness utxo fields for segwit wallets when displaying the PSBT as a QR - it can add greatly to the time required for scanning
         boolean includeNonWitnessUtxos = !Arrays.asList(ScriptType.WITNESS_TYPES).contains(headersForm.getSigningWallet().getScriptType());
-        CryptoPSBT cryptoPSBT = new CryptoPSBT(headersForm.getPsbt().serialize(true, includeNonWitnessUtxos));
+        byte[] psbtBytes = headersForm.getPsbt().serialize(true, includeNonWitnessUtxos);
-        QRDisplayDialog qrDisplayDialog = new QRDisplayDialog(cryptoPSBT.toUR(), addLegacyEncodingOption, true);
+
+        CryptoPSBT cryptoPSBT = new CryptoPSBT(psbtBytes);
+        BBQR bbqr = addBbqrOption ? new BBQR(BBQRType.PSBT, psbtBytes) : null;
+        QRDisplayDialog qrDisplayDialog = new QRDisplayDialog(cryptoPSBT.toUR(), bbqr, addLegacyEncodingOption, true, selectBbqrOption);
         qrDisplayDialog.initOwner(toggleButton.getScene().getWindow());
         Optional<ButtonType> optButtonType = qrDisplayDialog.showAndWait();
-        if(optButtonType.isPresent() && optButtonType.get().getButtonData() == ButtonBar.ButtonData.NEXT_FORWARD) {
+        if(optButtonType.isPresent() && optButtonType.get().getButtonData() == ButtonBar.ButtonData.OK_DONE) {
             scanPSBT(event);
         }
     }

src/main/java/module-info.java

@@ -63,4 +63,5 @@ open module com.sparrowwallet.sparrow {
     requires com.github.hervegirod;
     requires com.sparrowwallet.toucan;
     requires java.smartcardio;
+    requires com.jcraft.jzlib;
 }

src/test/java/com/sparrowwallet/sparrow/io/bbqr/BBQRDecoderTest.java

@@ -0,0 +1,37 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import com.sparrowwallet.sparrow.control.QRDensity;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Random;
+
+public class BBQRDecoderTest {
+    @Test
+    public void testDecoder() {
+        Random random = new Random();
+
+        for(QRDensity qrDensity : QRDensity.values()) {
+            for(BBQREncoding encoding : BBQREncoding.values()) {
+                for(int length = qrDensity.getMaxBbqrFragmentLength() / 2; length < qrDensity.getMaxBbqrFragmentLength() * 2.5d; length++) {
+                    byte[] data = new byte[length];
+                    random.nextBytes(data);
+
+                    BBQREncoder encoder = new BBQREncoder(BBQRType.BINARY, encoding, data, qrDensity.getMaxBbqrFragmentLength() + 13, 0);
+                    BBQRDecoder decoder = new BBQRDecoder();
+
+                    while(decoder.getPercentComplete() < 1d) {
+                        String part = encoder.nextPart();
+                        Assertions.assertTrue(BBQRDecoder.isBBQRFragment(part));
+                        if(random.nextDouble() < 0.7) {
+                            decoder.receivePart(part);
+                        }
+                    }
+
+                    Assertions.assertNotNull(decoder.getResult(), "Result was null for encoding " + encoding + " " + qrDensity + " " + length);
+                    Assertions.assertArrayEquals(data, decoder.getResult().getData());
+                }
+            }
+        }
+    }
+}

src/test/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncoderTest.java

@@ -0,0 +1,34 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import com.sparrowwallet.sparrow.control.QRDensity;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Random;
+
+public class BBQREncoderTest {
+    @Test
+    public void testEncoding() {
+        Random random = new Random();
+        for(QRDensity qrDensity : QRDensity.values()) {
+            for(BBQREncoding encoding : BBQREncoding.values()) {
+                for(int length = qrDensity.getMaxBbqrFragmentLength() / 2; length < qrDensity.getMaxBbqrFragmentLength() * 2.5d; length++) {
+                    byte[] data = new byte[length];
+                    random.nextBytes(data);
+
+                    BBQREncoder encoder = new BBQREncoder(BBQRType.BINARY, encoding, data, qrDensity.getMaxBbqrFragmentLength(), 0);
+                    int partLength = encoder.nextPart().length();
+                    for(int i = 1; i < encoder.getNumParts(); i++) {
+                        int nextPartLength = encoder.nextPart().length();
+                        if(i < encoder.getNumParts() - 1) {
+                            Assertions.assertEquals(0, nextPartLength % encoding.getPartModulo(), "Modulo test failed for " + length + " in encoding " + encoding + " on part " + (i+1) + " of " + encoder.getNumParts());
+                            Assertions.assertEquals(partLength, nextPartLength);
+                        } else {
+                            Assertions.assertTrue(nextPartLength <= partLength);
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

src/test/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncodingTest.java

@@ -0,0 +1,45 @@
+package com.sparrowwallet.sparrow.io.bbqr;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Random;
+
+public class BBQREncodingTest {
+    @Test
+    public void testHex() {
+        byte[] data = new byte[1000];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        String deflated = BBQREncoding.HEX.encode(data);
+        byte[] inflated = BBQREncoding.HEX.decode(deflated);
+
+        Assertions.assertArrayEquals(data, inflated);
+    }
+
+    @Test
+    public void testBase32() {
+        byte[] data = new byte[1000];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        String deflated = BBQREncoding.BASE32.encode(data);
+        byte[] inflated = BBQREncoding.BASE32.decode(deflated);
+
+        Assertions.assertArrayEquals(data, inflated);
+    }
+
+
+    @Test
+    public void testZlib() {
+        byte[] data = new byte[1000];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        String deflated = BBQREncoding.ZLIB.encode(data);
+        byte[] inflated = BBQREncoding.ZLIB.decode(deflated);
+
+        Assertions.assertArrayEquals(data, inflated);
+    }
+}