add support for configuring server aliases, and switching servers via the tools menu

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

@@ -182,6 +182,9 @@ public class AppController implements Initializable {
     @FXML
     private MenuItem showPayNym;
 
+    @FXML
+    private Menu switchServer;
+
     @FXML
     private CheckMenuItem preventSleep;
     private static final BooleanProperty preventSleepProperty = new SimpleBooleanProperty();
@@ -367,6 +370,7 @@ public class AppController implements Initializable {
             findMixingPartner.setDisable(exportWallet.isDisable() || getSelectedWalletForm() == null || !SorobanServices.canWalletMix(getSelectedWalletForm().getWallet()) || !newValue);
         });
 
+        configureSwitchServer();
         setServerType(Config.get().getServerType());
         serverToggle.setSelected(isConnected());
         serverToggle.setDisable(Config.get().getServerType() == null);
@@ -408,8 +412,7 @@ public class AppController implements Initializable {
         WelcomeDialog welcomeDialog = new WelcomeDialog();
         Optional<Mode> optionalMode = welcomeDialog.showAndWait();
         if(optionalMode.isPresent() && optionalMode.get().equals(Mode.ONLINE)) {
-            PreferencesDialog preferencesDialog = new PreferencesDialog(PreferenceGroup.SERVER);
+            openPreferences(PreferenceGroup.SERVER);
-            preferencesDialog.showAndWait();
         }
     }
 
@@ -902,7 +905,7 @@ public class AppController implements Initializable {
 
     private String getServerToggleTooltipText(Integer currentBlockHeight) {
         if(AppServices.isConnected()) {
-            return "Connected to " + Config.get().getServerAddress() + (currentBlockHeight != null ? " at height " + currentBlockHeight : "") +
+            return "Connected to " + Config.get().getServerDisplayName() + (currentBlockHeight != null ? " at height " + currentBlockHeight : "") +
                     (Config.get().getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER ? "\nWarning! You are connected to a public server and sharing your transaction data with it.\nFor better privacy, consider using your own Bitcoin Core node or private Electrum server." : "");
         }
 
@@ -1284,13 +1287,17 @@ public class AppController implements Initializable {
     }
 
     public void openPreferences(ActionEvent event) {
-        PreferencesDialog preferencesDialog = new PreferencesDialog();
+        openPreferences(PreferenceGroup.GENERAL);
-        preferencesDialog.showAndWait();
     }
 
     public void openServerPreferences(ActionEvent event) {
-        PreferencesDialog preferencesDialog = new PreferencesDialog(PreferenceGroup.SERVER);
+        openPreferences(PreferenceGroup.SERVER);
+    }
+
+    private void openPreferences(PreferenceGroup preferenceGroup) {
+        PreferencesDialog preferencesDialog = new PreferencesDialog(preferenceGroup);
         preferencesDialog.showAndWait();
+        configureSwitchServer();
     }
 
     public void signVerifyMessage(ActionEvent event) {
@@ -1996,6 +2003,48 @@ public class AppController implements Initializable {
         return contextMenu;
     }
 
+    private void configureSwitchServer() {
+        switchServer.getItems().clear();
+
+        Config config = Config.get();
+        if(config.getServerType() == ServerType.BITCOIN_CORE && config.getRecentCoreServers() != null && config.getRecentCoreServers().size() > 1) {
+            for(Server server : config.getRecentCoreServers()) {
+                switchServer.getItems().add(getSwitchServerMenuItem(ServerType.BITCOIN_CORE, server));
+            }
+        } else if(config.getServerType() == ServerType.ELECTRUM_SERVER && config.getRecentElectrumServers() != null && config.getRecentElectrumServers().size() > 1) {
+            for(Server server : config.getRecentElectrumServers()) {
+                switchServer.getItems().add(getSwitchServerMenuItem(ServerType.ELECTRUM_SERVER, server));
+            }
+        }
+
+        switchServer.setVisible(!switchServer.getItems().isEmpty());
+    }
+
+    private CheckMenuItem getSwitchServerMenuItem(ServerType serverType, Server server) {
+        CheckMenuItem checkMenuItem = new CheckMenuItem(server.getDisplayName());
+        boolean selected = (serverType == ServerType.BITCOIN_CORE ? server.equals(Config.get().getCoreServer()) : server.equals(Config.get().getElectrumServer()));
+        checkMenuItem.setSelected(selected);
+        checkMenuItem.setOnAction(event -> {
+            if(!selected) {
+                boolean online = onlineProperty().get();
+                onlineProperty().set(false);
+                if(serverType == ServerType.BITCOIN_CORE) {
+                    Config.get().setCoreServer(server);
+                } else if(serverType == ServerType.ELECTRUM_SERVER) {
+                    Config.get().setElectrumServer(server);
+                }
+                Platform.runLater(() -> {
+                    onlineProperty().set(online);
+                    configureSwitchServer();
+                });
+            } else {
+                checkMenuItem.setSelected(true);
+            }
+        });
+
+        return checkMenuItem;
+    }
+
     public void setServerType(ServerType serverType) {
         if(serverType == ServerType.PUBLIC_ELECTRUM_SERVER && !serverToggle.getStyleClass().contains("public-server")) {
             serverToggle.getStyleClass().add("public-server");
@@ -2424,11 +2473,12 @@ public class AppController implements Initializable {
 
     @Subscribe
     public void connection(ConnectionEvent event) {
-        String status = "Connected to " + Config.get().getServerAddress() + " at height " + event.getBlockHeight();
+        String status = "Connected to " + Config.get().getServerDisplayName() + " at height " + event.getBlockHeight();
         statusUpdated(new StatusEvent(status));
         setServerToggleTooltip(event.getBlockHeight());
         serverToggleStopAnimation();
         setTorIcon();
+        configureSwitchServer();
     }
 
     @Subscribe

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

@@ -203,7 +203,7 @@ public class AppServices {
 
     private void restartServices() {
         Config config = Config.get();
-        if(config.hasServerAddress()) {
+        if(config.hasServer()) {
             restartService(connectionService);
         }
 
@@ -268,7 +268,7 @@ public class AppServices {
         connectionService.setOnRunning(workerStateEvent -> {
             connectionService.setDelay(Duration.ZERO);
             if(!ElectrumServer.isConnected()) {
-                EventManager.get().post(new ConnectionStartEvent(Config.get().getServerAddress()));
+                EventManager.get().post(new ConnectionStartEvent(Config.get().getServerDisplayName()));
             }
         });
         connectionService.setOnSucceeded(successEvent -> {
@@ -1157,8 +1157,10 @@ public class AppServices {
 
     @Subscribe
     public void requestConnect(RequestConnectEvent event) {
+        if(Config.get().hasServer()) {
             onlineProperty.set(true);
         }
+    }
 
     @Subscribe
     public void requestDisconnect(RequestDisconnectEvent event) {
@@ -1209,7 +1211,7 @@ public class AppServices {
     public void walletHistoryFailed(WalletHistoryFailedEvent event) {
         if(Config.get().getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER && isConnected()) {
             onlineProperty.set(false);
-            log.warn("Failed to fetch wallet history from " + Config.get().getServerAddress() + ", reconnecting to another server...");
+            log.warn("Failed to fetch wallet history from " + Config.get().getServerDisplayName() + ", reconnecting to another server...");
             Config.get().changePublicServer();
             onlineProperty.set(true);
         }

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

@@ -77,7 +77,7 @@ public class MainApp extends Application {
                 } else if(Network.get() == Network.MAINNET) {
                     Config.get().setServerType(ServerType.PUBLIC_ELECTRUM_SERVER);
                     List<PublicElectrumServer> servers = PublicElectrumServer.getServers();
-                    Config.get().setPublicElectrumServer(servers.get(new Random().nextInt(servers.size())).getUrl());
+                    Config.get().setPublicElectrumServer(servers.get(new Random().nextInt(servers.size())).getServer());
                 }
             }
         }

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

@@ -67,6 +67,7 @@ public class FontAwesome5 extends GlyphFont {
         SNOWFLAKE('\uf2dc'),
         SORT_NUMERIC_DOWN('\uf162'),
         SUN('\uf185'),
+        TAG('\uf02b'),
         THEATER_MASKS('\uf630'),
         TIMES_CIRCLE('\uf057'),
         TOGGLE_OFF('\uf204'),

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -53,14 +53,14 @@ public class Config {
     private Boolean hdCapture;
     private String webcamDevice;
     private ServerType serverType;
-    private String publicElectrumServer;
+    private Server publicElectrumServer;
-    private String coreServer;
+    private Server coreServer;
-    private List<String> recentCoreServers;
+    private List<Server> recentCoreServers;
     private CoreAuthType coreAuthType;
     private File coreDataDir;
     private String coreAuth;
-    private String electrumServer;
+    private Server electrumServer;
-    private List<String> recentElectrumServers;
+    private List<Server> recentElectrumServers;
     private File electrumServerCert;
     private boolean useProxy;
     private String proxyServer;
@@ -77,6 +77,8 @@ public class Config {
         GsonBuilder gsonBuilder = new GsonBuilder();
         gsonBuilder.registerTypeAdapter(File.class, new FileSerializer());
         gsonBuilder.registerTypeAdapter(File.class, new FileDeserializer());
+        gsonBuilder.registerTypeAdapter(Server.class, new ServerSerializer());
+        gsonBuilder.registerTypeAdapter(Server.class, new ServerDeserializer());
         return gsonBuilder.setPrettyPrinting().disableHtmlEscaping().create();
     }
 
@@ -362,14 +364,18 @@ public class Config {
         flush();
     }
 
-    public boolean hasServerAddress() {
+    public boolean hasServer() {
-        return getServerAddress() != null && !getServerAddress().isEmpty();
+        return getServer() != null;
     }
 
-    public String getServerAddress() {
+    public Server getServer() {
         return getServerType() == ServerType.BITCOIN_CORE ? getCoreServer() : (getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER ? getPublicElectrumServer() : getElectrumServer());
     }
 
+    public String getServerDisplayName() {
+        return getServer() == null ? "server" : getServer().getDisplayName();
+    }
+
     public boolean requiresInternalTor() {
         if(isUseProxy()) {
             return false;
@@ -379,57 +385,71 @@ public class Config {
     }
 
     public boolean requiresTor() {
-        if(!hasServerAddress()) {
+        if(!hasServer()) {
             return false;
         }
 
-        Protocol protocol = Protocol.getProtocol(getServerAddress());
+        return getServer().isOnionAddress();
-        if(protocol == null) {
-            return false;
     }
 
-        return protocol.isOnionAddress(protocol.getServerHostAndPort(getServerAddress()));
+    public Server getPublicElectrumServer() {
-    }
-
-    public String getPublicElectrumServer() {
         return publicElectrumServer;
     }
 
-    public void setPublicElectrumServer(String publicElectrumServer) {
+    public void setPublicElectrumServer(Server publicElectrumServer) {
         this.publicElectrumServer = publicElectrumServer;
         flush();
     }
 
     public void changePublicServer() {
-        List<String> otherServers = PublicElectrumServer.getServers().stream().map(PublicElectrumServer::getUrl).filter(url -> !url.equals(getPublicElectrumServer())).collect(Collectors.toList());
+        List<Server> otherServers = PublicElectrumServer.getServers().stream().map(PublicElectrumServer::getServer).filter(server -> !server.equals(getPublicElectrumServer())).collect(Collectors.toList());
         if(!otherServers.isEmpty()) {
             setPublicElectrumServer(otherServers.get(new Random().nextInt(otherServers.size())));
         }
     }
 
-    public String getCoreServer() {
+    public Server getCoreServer() {
         return coreServer;
     }
 
-    public void setCoreServer(String coreServer) {
+    public void setCoreServer(Server coreServer) {
         this.coreServer = coreServer;
         flush();
     }
 
-    public List<String> getRecentCoreServers() {
+    public List<Server> getRecentCoreServers() {
-        return recentCoreServers;
+        return recentCoreServers == null ? new ArrayList<>() : recentCoreServers;
     }
 
-    public void addRecentCoreServer(String coreServer) {
+    public boolean addRecentCoreServer(Server coreServer) {
         if(recentCoreServers == null) {
             recentCoreServers = new ArrayList<>();
         }
 
-        if(!recentCoreServers.contains(coreServer)) {
+        int index = getRecentCoreServers().indexOf(coreServer);
-            recentCoreServers.stream().filter(url -> Objects.equals(Protocol.getHost(url), Protocol.getHost(coreServer)))
+        if(index < 0) {
-                    .findFirst().ifPresent(existingUrl -> recentCoreServers.remove(existingUrl));
+            recentCoreServers.removeIf(server -> server.getHost().equals(coreServer.getHost()) && server.getAlias() == null);
             recentCoreServers.add(coreServer);
             flush();
+            return true;
+        }
+
+        return false;
+    }
+
+    public void removeRecentCoreServer(Server server) {
+        int index = getRecentCoreServers().indexOf(server);
+        if(index >= 0) {
+            recentCoreServers.remove(index);
+            flush();
+        }
+    }
+
+    public void setCoreServerAlias(Server server) {
+        int index = getRecentCoreServers().indexOf(server);
+        if(index >= 0) {
+            recentCoreServers.set(index, server);
+            flush();
         }
     }
 
@@ -460,37 +480,59 @@ public class Config {
         flush();
     }
 
-    public String getElectrumServer() {
+    public Server getElectrumServer() {
         return electrumServer;
     }
 
-    public void setElectrumServer(String electrumServer) {
+    public void setElectrumServer(Server electrumServer) {
         this.electrumServer = electrumServer;
         flush();
     }
 
-    public List<String> getRecentElectrumServers() {
+    public List<Server> getRecentElectrumServers() {
-        return recentElectrumServers;
+        return recentElectrumServers == null ? new ArrayList<>() : recentElectrumServers;
     }
 
-    public void addRecentServer() {
+    public boolean addRecentServer() {
         if(serverType == ServerType.BITCOIN_CORE && coreServer != null) {
-            addRecentCoreServer(coreServer);
+            return addRecentCoreServer(coreServer);
         } else if(serverType == ServerType.ELECTRUM_SERVER && electrumServer != null) {
-            addRecentElectrumServer(electrumServer);
+            return addRecentElectrumServer(electrumServer);
-        }
         }
 
-    public void addRecentElectrumServer(String electrumServer) {
+        return false;
+    }
+
+    public boolean addRecentElectrumServer(Server electrumServer) {
         if(recentElectrumServers == null) {
             recentElectrumServers = new ArrayList<>();
         }
 
-        if(!recentElectrumServers.contains(electrumServer)) {
+        int index = getRecentElectrumServers().indexOf(electrumServer);
-            recentElectrumServers.stream().filter(url -> Objects.equals(Protocol.getHost(url), Protocol.getHost(electrumServer)))
+        if(index < 0) {
-                    .findFirst().ifPresent(existingUrl -> recentElectrumServers.remove(existingUrl));
+            recentElectrumServers.removeIf(server -> server.getHost().equals(electrumServer.getHost()) && server.getAlias() == null);
             recentElectrumServers.add(electrumServer);
             flush();
+
+            return true;
+        }
+
+        return false;
+    }
+
+    public void removeRecentElectrumServer(Server server) {
+        int index = getRecentElectrumServers().indexOf(server);
+        if(index >= 0) {
+            recentElectrumServers.remove(index);
+            flush();
+        }
+    }
+
+    public void setElectrumServerAlias(Server server) {
+        int index = getRecentElectrumServers().indexOf(server);
+        if(index >= 0) {
+            recentElectrumServers.set(index, server);
+            flush();
         }
     }
 
@@ -595,4 +637,18 @@ public class Config {
             return new File(json.getAsJsonPrimitive().getAsString());
         }
     }
+
+    private static class ServerSerializer implements JsonSerializer<Server> {
+        @Override
+        public JsonElement serialize(Server src, Type typeOfSrc, JsonSerializationContext context) {
+            return new JsonPrimitive(src.toString());
+        }
+    }
+
+    private static class ServerDeserializer implements JsonDeserializer<Server> {
+        @Override
+        public Server deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+            return Server.fromString(json.getAsJsonPrimitive().getAsString());
+        }
+    }
 }

src/main/java/com/sparrowwallet/sparrow/io/Server.java

@@ -0,0 +1,99 @@
+package com.sparrowwallet.sparrow.io;
+
+import com.google.common.net.HostAndPort;
+import com.sparrowwallet.sparrow.net.Protocol;
+
+import java.util.Arrays;
+
+public class Server {
+    private final String url;
+    private final String alias;
+
+    public Server(String url) {
+        this(url, null);
+    }
+
+    public Server(String url, String alias) {
+        if(url == null) {
+            throw new IllegalArgumentException("Url cannot be null");
+        }
+
+        if(url.isEmpty()) {
+            throw new IllegalArgumentException("Url cannot be empty");
+        }
+
+        if(Protocol.getProtocol(url) == null) {
+            throw new IllegalArgumentException("Unknown protocol for url " + url + ", must be one of " + Arrays.toString(Protocol.values()));
+        }
+
+        if(Protocol.getHost(url) == null) {
+            throw new IllegalArgumentException("Cannot determine host for url " + url);
+        }
+
+        if(alias != null && alias.isEmpty()) {
+            throw new IllegalArgumentException("Server alias cannot be an empty string");
+        }
+
+        this.url = url;
+        this.alias = alias;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public Protocol getProtocol() {
+        return Protocol.getProtocol(url);
+    }
+
+    public HostAndPort getHostAndPort() {
+        return getProtocol().getServerHostAndPort(url);
+    }
+
+    public String getHost() {
+        return getHostAndPort().getHost();
+    }
+
+    public boolean isOnionAddress() {
+        return Protocol.isOnionAddress(getHostAndPort());
+    }
+
+    public String getAlias() {
+        return alias;
+    }
+
+    public String getDisplayName() {
+        return alias == null ? url : alias;
+    }
+
+    public String toString() {
+        return url + (alias == null ? "" : "|" + alias);
+    }
+
+    public static Server fromString(String server) {
+        String[] parts = server.split("\\|");
+        if(parts.length >= 2) {
+            return new Server(parts[0], parts[1]);
+        }
+
+        return new Server(parts[0], null);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        Server server = (Server)o;
+        return url.equals(server.url);
+    }
+
+    @Override
+    public int hashCode() {
+        return url.hashCode();
+    }
+}

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

@@ -143,8 +143,8 @@ public class Bwt {
         bwtConfig.electrumSkipMerkle = true;
 
         Config config = Config.get();
-        bwtConfig.bitcoindUrl = config.getCoreServer();
+        if(config.getCoreServer() != null) {
-        if(bwtConfig.bitcoindUrl != null) {
+            bwtConfig.bitcoindUrl = config.getCoreServer().getUrl();
             try {
                 HostAndPort hostAndPort = Protocol.HTTP.getServerHostAndPort(bwtConfig.bitcoindUrl);
                 if(hostAndPort.getHost().endsWith(".local")) {
@@ -308,7 +308,7 @@ public class Bwt {
                                 Bwt.this.shutdown();
                                 terminating = false;
                             } else {
-                                Platform.runLater(() -> EventManager.get().post(new BwtBootStatusEvent("Connecting to Bitcoin Core node at " + Config.get().getCoreServer() + "...")));
+                                Platform.runLater(() -> EventManager.get().post(new BwtBootStatusEvent("Connecting to Bitcoin Core node " + Config.get().getServerDisplayName() + "...")));
                             }
                         }
 

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

@@ -1,6 +1,5 @@
 package com.sparrowwallet.sparrow.net;
 
-import com.github.arteam.simplejsonrpc.client.Transport;
 import com.google.common.eventbus.Subscribe;
 import com.google.common.net.HostAndPort;
 import com.sparrowwallet.drongo.KeyPurpose;
@@ -15,6 +14,7 @@ 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.io.Server;
 import com.sparrowwallet.sparrow.paynym.PayNym;
 import javafx.application.Platform;
 import javafx.beans.property.IntegerProperty;
@@ -51,7 +51,7 @@ public class ElectrumServer {
 
     private static final Map<String, List<String>> subscribedScriptHashes = Collections.synchronizedMap(new HashMap<>());
 
-    private static String previousServerAddress;
+    private static Server previousServer;
 
     private static Map<String, String> retrievedScriptHashes = Collections.synchronizedMap(new HashMap<>());
 
@@ -59,14 +59,14 @@ public class ElectrumServer {
 
     private static ElectrumServerRpc electrumServerRpc = new SimpleElectrumServerRpc();
 
-    private static String bwtElectrumServer;
+    private static Server bwtElectrumServer;
 
     private static final Pattern RPC_WALLET_LOADING_PATTERN = Pattern.compile(".*\"(Wallet loading failed:[^\"]*)\".*");
 
     private static synchronized CloseableTransport getTransport() throws ServerException {
         if(transport == null) {
             try {
-                String electrumServer = null;
+                Server electrumServer = null;
                 File electrumServerCert = null;
                 String proxyServer = null;
 
@@ -78,8 +78,8 @@ public class ElectrumServer {
                         throw new ServerConfigException("Could not connect to Bitcoin Core RPC");
                     }
                     electrumServer = bwtElectrumServer;
-                    if(previousServerAddress != null && previousServerAddress.contains(Bwt.ELECTRUM_HOST)) {
+                    if(previousServer != null && previousServer.getUrl().contains(Bwt.ELECTRUM_HOST)) {
-                        previousServerAddress = bwtElectrumServer;
+                        previousServer = bwtElectrumServer;
                     }
                 } else if(Config.get().getServerType() == ServerType.ELECTRUM_SERVER) {
                     electrumServer = Config.get().getElectrumServer();
@@ -95,33 +95,30 @@ public class ElectrumServer {
                     throw new ServerConfigException("Electrum server certificate file not found");
                 }
 
-                Protocol protocol = Protocol.getProtocol(electrumServer);
+                Protocol protocol = electrumServer.getProtocol();
-                if(protocol == null) {
-                    throw new ServerConfigException("Electrum server URL must start with " + Protocol.TCP.toUrlString() + " or " + Protocol.SSL.toUrlString());
-                }
 
                 //If changing server, don't rely on previous transaction history
-                if(previousServerAddress != null && !electrumServer.equals(previousServerAddress)) {
+                if(previousServer != null && !electrumServer.equals(previousServer)) {
                     retrievedScriptHashes.clear();
                     retrievedTransactions.clear();
                 }
-                previousServerAddress = electrumServer;
+                previousServer = electrumServer;
 
-                HostAndPort server = protocol.getServerHostAndPort(electrumServer);
+                HostAndPort hostAndPort = electrumServer.getHostAndPort();
-                boolean localNetworkAddress = !protocol.isOnionAddress(server) && IpAddressMatcher.isLocalNetworkAddress(server.getHost());
+                boolean localNetworkAddress = !protocol.isOnionAddress(hostAndPort) && IpAddressMatcher.isLocalNetworkAddress(hostAndPort.getHost());
 
                 if(!localNetworkAddress && Config.get().isUseProxy() && proxyServer != null && !proxyServer.isBlank()) {
                     HostAndPort proxy = HostAndPort.fromString(proxyServer);
                     if(electrumServerCert != null) {
-                        transport = protocol.getTransport(server, electrumServerCert, proxy);
+                        transport = protocol.getTransport(hostAndPort, electrumServerCert, proxy);
                     } else {
-                        transport = protocol.getTransport(server, proxy);
+                        transport = protocol.getTransport(hostAndPort, proxy);
                     }
                 } else {
                     if(electrumServerCert != null) {
-                        transport = protocol.getTransport(server, electrumServerCert);
+                        transport = protocol.getTransport(hostAndPort, electrumServerCert);
                     } else {
-                        transport = protocol.getTransport(server);
+                        transport = protocol.getTransport(hostAndPort);
                     }
                 }
             } catch (Exception e) {
@@ -1251,7 +1248,7 @@ public class ElectrumServer {
         @Subscribe
         public void bwtElectrumReadyStatus(BwtElectrumReadyStatusEvent event) {
             if(this.isRunning()) {
-                ElectrumServer.bwtElectrumServer = Protocol.TCP.toUrlString(HostAndPort.fromString(event.getElectrumAddr()));
+                ElectrumServer.bwtElectrumServer = new Server(Protocol.TCP.toUrlString(HostAndPort.fromString(event.getElectrumAddr())));
             }
         }
 

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

@@ -97,7 +97,7 @@ public final class IpAddressMatcher {
             return InetAddress.getByName(address);
         }
         catch (UnknownHostException e) {
-            throw new IllegalArgumentException("Failed to parse address" + address, e);
+            throw new IllegalArgumentException("Failed to parse address: " + address, e);
         }
     }
 

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

@@ -1,7 +1,7 @@
 package com.sparrowwallet.sparrow.net;
 
-import com.github.arteam.simplejsonrpc.client.Transport;
 import com.google.common.net.HostAndPort;
+import com.sparrowwallet.sparrow.io.Server;
 
 import java.io.File;
 import java.io.IOException;
@@ -121,6 +121,14 @@ public enum Protocol {
         return host != null && host.toLowerCase(Locale.ROOT).endsWith(TorService.TOR_ADDRESS_SUFFIX);
     }
 
+    public static boolean isOnionAddress(Server server) {
+        if(server != null) {
+            return isOnionAddress(server.getHostAndPort());
+        }
+
+        return false;
+    }
+
     public static boolean isOnionAddress(HostAndPort server) {
         return isOnionHost(server.getHost());
     }

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

@@ -1,6 +1,7 @@
 package com.sparrowwallet.sparrow.net;
 
 import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.sparrow.io.Server;
 
 import java.util.Arrays;
 import java.util.List;
@@ -15,23 +16,21 @@ public enum PublicElectrumServer {
     TESTNET_ARANGUREN_ORG("testnet.aranguren.org", "ssl://testnet.aranguren.org:51002", Network.TESTNET);
 
     PublicElectrumServer(String name, String url, Network network) {
-        this.name = name;
+        this.server = new Server(url, name);
-        this.url = url;
         this.network = network;
     }
 
     public static final List<Network> SUPPORTED_NETWORKS = List.of(Network.MAINNET, Network.TESTNET);
 
-    private final String name;
+    private final Server server;
-    private final String url;
     private final Network network;
 
-    public String getName() {
+    public Server getServer() {
-        return name;
+        return server;
     }
 
     public String getUrl() {
-        return url;
+        return server.getUrl();
     }
 
     public Network getNetwork() {
@@ -46,10 +45,10 @@ public enum PublicElectrumServer {
         return SUPPORTED_NETWORKS.contains(Network.get());
     }
 
-    public static PublicElectrumServer fromUrl(String url) {
+    public static PublicElectrumServer fromServer(Server server) {
-        for(PublicElectrumServer server : values()) {
+        for(PublicElectrumServer publicServer : values()) {
-            if(server.url.equals(url)) {
+            if(publicServer.getServer().equals(server)) {
-                return server;
+                return publicServer;
             }
         }
 
@@ -58,6 +57,6 @@ public enum PublicElectrumServer {
 
     @Override
     public String toString() {
-        return name;
+        return server.getAlias();
     }
 }

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

@@ -111,7 +111,8 @@ public class TcpOverTlsTransport extends TcpTransport {
 
     protected boolean shouldSaveCertificate() {
         //Avoid saving the certificates for blockstream.info public servers - they change too often and encourage approval complacency
-        if(PublicElectrumServer.BLOCKSTREAM_INFO.getName().equals(server.getHost()) || PublicElectrumServer.ELECTRUM_BLOCKSTREAM_INFO.getName().equals(server.getHost())) {
+        if(PublicElectrumServer.BLOCKSTREAM_INFO.getServer().getHost().equals(server.getHost())
+                || PublicElectrumServer.ELECTRUM_BLOCKSTREAM_INFO.getServer().getHost().equals(server.getHost())) {
             return false;
         }
 

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

@@ -100,6 +100,10 @@ public class TcpTransport implements CloseableTransport, TimeoutCounter {
             log.trace("Sending to electrum server at " + server + ": " + request);
         }
 
+        if(socket == null) {
+            throw new IllegalStateException("Socket connection has not been established.");
+        }
+
         PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));
         out.println(request);
         out.flush();
@@ -207,7 +211,7 @@ public class TcpTransport implements CloseableTransport, TimeoutCounter {
         String response = readLine(in);
 
         if(response == null) {
-            throw new IOException("Could not connect to server at " + Config.get().getServerAddress());
+            throw new IOException("Could not connect to server" + (Config.get().hasServer() ? " at " + Config.get().getServer().getUrl() : ""));
         }
 
         return response;

src/main/java/com/sparrowwallet/sparrow/preferences/ServerAliasDialog.java

@@ -0,0 +1,214 @@
+package com.sparrowwallet.sparrow.preferences;
+
+import com.sparrowwallet.sparrow.AppServices;
+import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
+import com.sparrowwallet.sparrow.io.Config;
+import com.sparrowwallet.sparrow.io.Server;
+import com.sparrowwallet.sparrow.net.ServerType;
+import javafx.beans.property.ReadOnlyObjectWrapper;
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+import javafx.collections.FXCollections;
+import javafx.event.Event;
+import javafx.scene.Node;
+import javafx.scene.control.*;
+import javafx.scene.control.cell.TextFieldTableCell;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.StackPane;
+import javafx.util.converter.DefaultStringConverter;
+import org.controlsfx.glyphfont.Glyph;
+
+import java.lang.reflect.Field;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ServerAliasDialog extends Dialog<Server> {
+    private final ServerType serverType;
+    private final TableView<ServerEntry> serverTable;
+
+    public ServerAliasDialog(ServerType serverType) {
+        this.serverType = serverType;
+
+        final DialogPane dialogPane = new ServerAliasDialogPane();
+        setDialogPane(dialogPane);
+        AppServices.setStageIcon(dialogPane.getScene().getWindow());
+
+        setTitle("Server Aliases");
+        dialogPane.getStylesheets().add(AppServices.class.getResource("general.css").toExternalForm());
+        dialogPane.setHeaderText("Configure aliases for recently connected servers.\nNew servers are added to this list on successful connections.");
+
+        Image image = new Image("/image/sparrow-small.png");
+        dialogPane.setGraphic(new ImageView(image));
+
+        serverTable = new TableView<>();
+        serverTable.setPlaceholder(new Label("No servers added yet"));
+
+        TableColumn<ServerEntry, String> urlColumn = new TableColumn<>("URL");
+        urlColumn.setMinWidth(300);
+        urlColumn.setCellValueFactory((TableColumn.CellDataFeatures<ServerEntry, String> param) -> {
+            return new ReadOnlyObjectWrapper<>(param.getValue().getUrl());
+        });
+
+        TableColumn<ServerEntry, String> aliasColumn = new TableColumn<>("Alias");
+        aliasColumn.setCellValueFactory((TableColumn.CellDataFeatures<ServerEntry, String> param) -> {
+            return param.getValue().labelProperty();
+        });
+        aliasColumn.setCellFactory(value -> new AliasCell());
+        aliasColumn.setGraphic(getTagGlyph());
+
+        serverTable.getColumns().add(urlColumn);
+        serverTable.getColumns().add(aliasColumn);
+        serverTable.setEditable(true);
+        serverTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
+
+        List<Server> servers = serverType == ServerType.BITCOIN_CORE ? Config.get().getRecentCoreServers() : Config.get().getRecentElectrumServers();
+        List<ServerEntry> serverEntries = servers.stream().map(server -> new ServerEntry(serverType, server)).collect(Collectors.toList());
+        serverTable.setItems(FXCollections.observableArrayList(serverEntries));
+
+        StackPane stackPane = new StackPane();
+        stackPane.getChildren().add(serverTable);
+        dialogPane.setContent(stackPane);
+
+        ButtonType selectButtonType = new ButtonType("Select", ButtonBar.ButtonData.APPLY);
+        ButtonType deleteButtonType = new ButtonType("Delete", ButtonBar.ButtonData.LEFT);
+        dialogPane.getButtonTypes().addAll(deleteButtonType, ButtonType.CLOSE, selectButtonType);
+
+        Button selectButton = (Button)dialogPane.lookupButton(selectButtonType);
+        Button deleteButton = (Button)dialogPane.lookupButton(deleteButtonType);
+        selectButton.setDefaultButton(true);
+        selectButton.setDisable(true);
+        deleteButton.setDisable(true);
+        serverTable.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
+            selectButton.setDisable(newValue == null);
+            deleteButton.setDisable(newValue == null);
+        });
+
+        setResultConverter(buttonType -> buttonType == selectButtonType ? serverTable.getSelectionModel().getSelectedItem().getServer() : null);
+
+        dialogPane.setPrefWidth(680);
+        dialogPane.setPrefHeight(500);
+        AppServices.setStageIcon(dialogPane.getScene().getWindow());
+        AppServices.moveToActiveWindowScreen(this);
+    }
+
+    private static Glyph getTagGlyph() {
+        Glyph glyph = new Glyph(FontAwesome5.FONT_NAME, FontAwesome5.Glyph.TAG);
+        glyph.setFontSize(12);
+        return glyph;
+    }
+
+    private class ServerAliasDialogPane extends DialogPane {
+        @Override
+        protected Node createButton(ButtonType buttonType) {
+            Node button;
+            if(buttonType.getButtonData() == ButtonBar.ButtonData.LEFT) {
+                Button deleteButton = new Button(buttonType.getText());
+                final ButtonBar.ButtonData buttonData = buttonType.getButtonData();
+                ButtonBar.setButtonData(deleteButton, buttonData);
+                deleteButton.setOnAction(event -> {
+                    ServerEntry serverEntry = serverTable.getSelectionModel().getSelectedItem();
+                    if(serverEntry != null) {
+                        serverTable.getItems().remove(serverEntry);
+                        if(serverType == ServerType.BITCOIN_CORE) {
+                            Config.get().removeRecentCoreServer(serverEntry.getServer());
+                        } else {
+                            Config.get().removeRecentElectrumServer(serverEntry.getServer());
+                        }
+                    }
+                });
+
+                button = deleteButton;
+            } else {
+                button = super.createButton(buttonType);
+            }
+
+            return button;
+        }
+    }
+
+    private static class ServerEntry {
+        private final Server server;
+        private final StringProperty labelProperty = new SimpleStringProperty();
+
+        public ServerEntry(ServerType serverType, Server server) {
+            this.server = server;
+            labelProperty.set(server.getAlias());
+            labelProperty.addListener((observable, oldValue, newValue) -> {
+                String alias = newValue;
+                if(alias != null && alias.isEmpty()) {
+                    alias = null;
+                }
+
+                Server newServer = new Server(server.getUrl(), alias);
+                if(serverType == ServerType.BITCOIN_CORE) {
+                    Config.get().setCoreServerAlias(newServer);
+                } else {
+                    Config.get().setElectrumServerAlias(newServer);
+                }
+            });
+        }
+
+        public String getUrl() {
+            return server.getHostAndPort().toString();
+        }
+
+        public StringProperty labelProperty() {
+            return labelProperty;
+        }
+
+        public Server getServer() {
+            return new Server(server.getUrl(), labelProperty.get());
+        }
+    }
+
+    private static class AliasCell extends TextFieldTableCell<ServerEntry, String> {
+        public AliasCell() {
+            super(new DefaultStringConverter());
+        }
+
+        @Override
+        public void commitEdit(String label) {
+            if(label != null) {
+                label = label.trim();
+            }
+
+            // This block is necessary to support commit on losing focus, because
+            // the baked-in mechanism sets our editing state to false before we can
+            // intercept the loss of focus. The default commitEdit(...) method
+            // simply bails if we are not editing...
+            if (!isEditing() && !label.equals(getItem())) {
+                TableView<ServerEntry> table = getTableView();
+                if(table != null) {
+                    TableColumn<ServerEntry, String> column = getTableColumn();
+                    TableColumn.CellEditEvent<ServerEntry, String> event = new TableColumn.CellEditEvent<>(
+                            table, new TablePosition<>(table, getIndex(), column),
+                            TableColumn.editCommitEvent(), label
+                    );
+                    Event.fireEvent(column, event);
+                }
+            }
+
+            super.commitEdit(label);
+        }
+
+        @Override
+        public void startEdit() {
+            super.startEdit();
+
+            try {
+                Field f = getClass().getSuperclass().getDeclaredField("textField");
+                f.setAccessible(true);
+                TextField textField = (TextField)f.get(this);
+                textField.focusedProperty().addListener((obs, wasFocused, isNowFocused) -> {
+                    if (!isNowFocused) {
+                        commitEdit(getConverter().fromString(textField.getText()));
+                        setText(getConverter().fromString(textField.getText()));
+                    }
+                });
+            } catch (Exception e) {
+                //ignore
+            }
+        }
+    }
+}

src/main/java/com/sparrowwallet/sparrow/preferences/ServerPreferencesController.java

@@ -12,11 +12,13 @@ import com.sparrowwallet.sparrow.control.UnlabeledToggleSwitch;
 import com.sparrowwallet.sparrow.event.*;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.io.Config;
+import com.sparrowwallet.sparrow.io.Server;
 import com.sparrowwallet.sparrow.io.Storage;
 import com.sparrowwallet.sparrow.net.*;
 import javafx.application.Platform;
 import javafx.beans.value.ChangeListener;
 import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
 import javafx.scene.text.Font;
@@ -51,6 +53,8 @@ import java.util.Random;
 public class ServerPreferencesController extends PreferencesDetailController {
     private static final Logger log = LoggerFactory.getLogger(ServerPreferencesController.class);
 
+    private static final Server MANAGE_ALIASES_SERVER = new Server("tcp://localhost", "Manage Aliases...");
+
     @FXML
     private ToggleGroup serverTypeToggleGroup;
 
@@ -79,7 +83,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
     private Form coreForm;
 
     @FXML
-    private ComboBox<String> recentCoreServers;
+    private ComboBox<Server> recentCoreServers;
 
     @FXML
     private ComboBoxTextField coreHost;
@@ -121,7 +125,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
     private Form electrumForm;
 
     @FXML
-    private ComboBox<String> recentElectrumServers;
+    private ComboBox<Server> recentElectrumServers;
 
     @FXML
     private ComboBoxTextField electrumHost;
@@ -267,26 +271,52 @@ public class ServerPreferencesController extends PreferencesDetailController {
             }
         });
 
-        recentCoreServers.setConverter(new UrlHostConverter());
+        recentCoreServers.setCellFactory(value -> new ServerCell());
-        recentCoreServers.setItems(FXCollections.observableList(Config.get().getRecentCoreServers() == null ? new ArrayList<>() : Config.get().getRecentCoreServers()));
+        recentCoreServers.setItems(getObservableServerList(Config.get().getRecentCoreServers()));
         recentCoreServers.prefWidthProperty().bind(coreHost.widthProperty());
         recentCoreServers.valueProperty().addListener((observable, oldValue, newValue) -> {
-            if(newValue != null && Protocol.getProtocol(newValue) != null) {
+            if(newValue != null) {
-                HostAndPort hostAndPort = Protocol.getProtocol(newValue).getServerHostAndPort(newValue);
+                if(newValue == MANAGE_ALIASES_SERVER) {
+                    ServerAliasDialog serverAliasDialog = new ServerAliasDialog(ServerType.BITCOIN_CORE);
+                    Optional<Server> optServer = serverAliasDialog.showAndWait();
+                    recentCoreServers.setItems(getObservableServerList(Config.get().getRecentCoreServers()));
+                    Server selectedServer = optServer.orElseGet(() -> Config.get().getCoreServer());
+                    Platform.runLater(() -> recentCoreServers.setValue(selectedServer));
+                } else if(newValue.getHostAndPort() != null) {
+                    HostAndPort hostAndPort = newValue.getHostAndPort();
+                    corePort.setText(hostAndPort.hasPort() ? Integer.toString(hostAndPort.getPort()) : "");
+                    if(newValue.getAlias() != null) {
+                        coreHost.setText(newValue.getAlias());
+                    } else {
                         coreHost.setText(hostAndPort.getHost());
-                corePort.setText(Integer.toString(hostAndPort.getPort()));
+                    }
+                    coreHost.positionCaret(coreHost.getText().length());
+                }
             }
         });
 
-        recentElectrumServers.setConverter(new UrlHostConverter());
+        recentElectrumServers.setCellFactory(value -> new ServerCell());
-        recentElectrumServers.setItems(FXCollections.observableList(Config.get().getRecentElectrumServers() == null ? new ArrayList<>() : Config.get().getRecentElectrumServers()));
+        recentElectrumServers.setItems(getObservableServerList(Config.get().getRecentElectrumServers()));
         recentElectrumServers.prefWidthProperty().bind(electrumHost.widthProperty());
         recentElectrumServers.valueProperty().addListener((observable, oldValue, newValue) -> {
-            if(newValue != null && Protocol.getProtocol(newValue) != null) {
+            if(newValue != null) {
-                HostAndPort hostAndPort = Protocol.getProtocol(newValue).getServerHostAndPort(newValue);
+                if(newValue == MANAGE_ALIASES_SERVER) {
+                    ServerAliasDialog serverAliasDialog = new ServerAliasDialog(ServerType.ELECTRUM_SERVER);
+                    Optional<Server> optServer = serverAliasDialog.showAndWait();
+                    recentElectrumServers.setItems(getObservableServerList(Config.get().getRecentElectrumServers()));
+                    Server selectedServer = optServer.orElseGet(() -> Config.get().getElectrumServer());
+                    Platform.runLater(() -> recentElectrumServers.setValue(selectedServer));
+                } else if(newValue.getHostAndPort() != null) {
+                    HostAndPort hostAndPort = newValue.getHostAndPort();
+                    electrumPort.setText(hostAndPort.hasPort() ? Integer.toString(hostAndPort.getPort()) : "");
+                    electrumUseSsl.setSelected(newValue.getProtocol() == Protocol.SSL);
+                    if(newValue.getAlias() != null) {
+                        electrumHost.setText(newValue.getAlias());
+                    } else {
                         electrumHost.setText(hostAndPort.getHost());
-                electrumPort.setText(Integer.toString(hostAndPort.getPort()));
+                    }
-                electrumUseSsl.setSelected(Protocol.getProtocol(newValue) == Protocol.SSL);
+                    electrumHost.positionCaret(electrumHost.getText().length());
+                }
             }
         });
 
@@ -339,7 +369,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
         setTestResultsFont();
         testConnection.setOnAction(event -> {
             testConnection.setGraphic(getGlyph(FontAwesome5.Glyph.ELLIPSIS_H, null));
-            testResults.setText("Connecting to " + config.getServerAddress() + "...");
+            testResults.setText("Connecting " + (config.hasServer() ? "to " + config.getServer().getUrl() : "") + "...");
 
             if(Config.get().requiresInternalTor() && Tor.getDefault() == null) {
                 startTor();
@@ -358,7 +388,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
             testConnection.setVisible(true);
         });
 
-        PublicElectrumServer configPublicElectrumServer = PublicElectrumServer.fromUrl(config.getPublicElectrumServer());
+        PublicElectrumServer configPublicElectrumServer = PublicElectrumServer.fromServer(config.getPublicElectrumServer());
         if(configPublicElectrumServer == null && PublicElectrumServer.supportedNetwork()) {
             List<PublicElectrumServer> servers = PublicElectrumServer.getServers();
             if(!servers.isEmpty()) {
@@ -368,16 +398,16 @@ public class ServerPreferencesController extends PreferencesDetailController {
             publicElectrumServer.setValue(configPublicElectrumServer);
         }
 
-        String coreServer = config.getCoreServer();
+        Server coreServer = config.getCoreServer();
         if(coreServer != null) {
-            Protocol protocol = Protocol.getProtocol(coreServer);
+            HostAndPort hostAndPort = coreServer.getHostAndPort();
-
+            Server server = config.getRecentCoreServers().stream().filter(coreServer::equals).findFirst().orElse(null);
-            if(protocol != null) {
+            if(server != null) {
-                HostAndPort server = protocol.getServerHostAndPort(coreServer);
+                coreHost.setLeft(getGlyph(FontAwesome5.Glyph.TAG, null));
-                coreHost.setText(server.getHost());
-                if(server.hasPort()) {
-                    corePort.setText(Integer.toString(server.getPort()));
             }
+            coreHost.setText(server == null || server.getAlias() == null ? hostAndPort.getHost() : server.getAlias());
+            if(hostAndPort.hasPort()) {
+                corePort.setText(Integer.toString(hostAndPort.getPort()));
             }
         } else {
             coreHost.setText("127.0.0.1");
@@ -396,21 +426,22 @@ public class ServerPreferencesController extends PreferencesDetailController {
             }
         }
 
-        String electrumServer = config.getElectrumServer();
+        Server electrumServer = config.getElectrumServer();
         if(electrumServer != null) {
-            Protocol protocol = Protocol.getProtocol(electrumServer);
+            Protocol protocol = electrumServer.getProtocol();
-
-            if(protocol != null) {
             boolean ssl = protocol.equals(Protocol.SSL);
             electrumUseSsl.setSelected(ssl);
             electrumCertificate.setDisable(!ssl);
             electrumCertificateSelect.setDisable(!ssl);
 
-                HostAndPort server = protocol.getServerHostAndPort(electrumServer);
+            HostAndPort hostAndPort = electrumServer.getHostAndPort();
-                electrumHost.setText(server.getHost());
+            Server server = config.getRecentElectrumServers().stream().filter(electrumServer::equals).findFirst().orElse(null);
-                if(server.hasPort()) {
+            if(server != null) {
-                    electrumPort.setText(Integer.toString(server.getPort()));
+                electrumHost.setLeft(getGlyph(FontAwesome5.Glyph.TAG, null));
             }
+            electrumHost.setText(server == null || server.getAlias() == null ? hostAndPort.getHost() : server.getAlias());
+            if(hostAndPort.hasPort()) {
+                electrumPort.setText(Integer.toString(hostAndPort.getPort()));
             }
         }
 
@@ -449,7 +480,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
         torService.setOnSucceeded(workerStateEvent -> {
             Tor.setDefault(torService.getValue());
             torService.cancel();
-            testResults.appendText("\nTor running, connecting to " + Config.get().getServerAddress() + "...");
+            testResults.appendText("\nTor running, connecting to " + Config.get().getServer().getUrl() + "...");
             startElectrumConnection();
         });
         torService.setOnFailed(workerStateEvent -> {
@@ -495,6 +526,13 @@ public class ServerPreferencesController extends PreferencesDetailController {
             Config.get().setMode(Mode.ONLINE);
             connectionService.cancel();
             useProxyOriginal = null;
+            if(Config.get().addRecentServer()) {
+                if(Config.get().getServerType() == ServerType.BITCOIN_CORE) {
+                    recentCoreServers.setItems(getObservableServerList(Config.get().getRecentCoreServers()));
+                } else if(Config.get().getServerType() == ServerType.ELECTRUM_SERVER) {
+                    recentElectrumServers.setItems(getObservableServerList(Config.get().getRecentElectrumServers()));
+                }
+            }
         });
         connectionService.setOnFailed(workerStateEvent -> {
             EventManager.get().unregister(connectionService);
@@ -668,24 +706,32 @@ public class ServerPreferencesController extends PreferencesDetailController {
     @NotNull
     private ChangeListener<PublicElectrumServer> getPublicElectrumServerListener(Config config) {
         return (observable, oldValue, newValue) -> {
-            config.setPublicElectrumServer(newValue.getUrl());
+            config.setPublicElectrumServer(newValue.getServer());
         };
     }
 
     @NotNull
     private ChangeListener<String> getBitcoinCoreListener(Config config) {
         return (observable, oldValue, newValue) -> {
+            Server existingServer = config.getRecentCoreServers().stream().filter(server -> coreHost.getText().equals(server.getAlias())).findFirst().orElse(null);
+            coreHost.setLeft(existingServer == null ? null : getGlyph(FontAwesome5.Glyph.TAG, null));
             setCoreServerInConfig(config);
         };
     }
 
     private void setCoreServerInConfig(Config config) {
+        Server existingServer = config.getRecentCoreServers().stream().filter(server -> coreHost.getText().equals(server.getAlias())).findFirst().orElse(null);
+        if(existingServer != null) {
+            config.setCoreServer(existingServer);
+            return;
+        }
+
         String hostAsString = getHost(coreHost.getText());
         Integer portAsInteger = getPort(corePort.getText());
         if(hostAsString != null && portAsInteger != null && isValidPort(portAsInteger)) {
-            config.setCoreServer(Protocol.HTTP.toUrlString(hostAsString, portAsInteger));
+            config.setCoreServer(new Server(Protocol.HTTP.toUrlString(hostAsString, portAsInteger)));
         } else if(hostAsString != null) {
-            config.setCoreServer(Protocol.HTTP.toUrlString(hostAsString));
+            config.setCoreServer(new Server(Protocol.HTTP.toUrlString(hostAsString)));
         }
     }
 
@@ -699,17 +745,25 @@ public class ServerPreferencesController extends PreferencesDetailController {
     @NotNull
     private ChangeListener<String> getElectrumServerListener(Config config) {
         return (observable, oldValue, newValue) -> {
+            Server existingServer = config.getRecentElectrumServers().stream().filter(server -> electrumHost.getText().equals(server.getAlias())).findFirst().orElse(null);
+            electrumHost.setLeft(existingServer == null ? null : getGlyph(FontAwesome5.Glyph.TAG, null));
             setElectrumServerInConfig(config);
         };
     }
 
     private void setElectrumServerInConfig(Config config) {
+        Server existingServer = config.getRecentElectrumServers().stream().filter(server -> electrumHost.getText().equals(server.getAlias())).findFirst().orElse(null);
+        if(existingServer != null) {
+            config.setElectrumServer(existingServer);
+            return;
+        }
+
         String hostAsString = getHost(electrumHost.getText());
         Integer portAsInteger = getPort(electrumPort.getText());
         if(hostAsString != null && portAsInteger != null && isValidPort(portAsInteger)) {
-            config.setElectrumServer(getProtocol().toUrlString(hostAsString, portAsInteger));
+            config.setElectrumServer(new Server(getProtocol().toUrlString(hostAsString, portAsInteger)));
         } else if(hostAsString != null) {
-            config.setElectrumServer(getProtocol().toUrlString(hostAsString));
+            config.setElectrumServer(new Server(getProtocol().toUrlString(hostAsString)));
         }
     }
 
@@ -777,7 +831,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
         }
     }
 
-    private Glyph getGlyph(FontAwesome5.Glyph glyphName, String styleClass) {
+    private static Glyph getGlyph(FontAwesome5.Glyph glyphName, String styleClass) {
         Glyph glyph = new Glyph(FontAwesome5.FONT_NAME, glyphName);
         glyph.setFontSize(12);
         if(styleClass != null) {
@@ -813,6 +867,12 @@ public class ServerPreferencesController extends PreferencesDetailController {
         }
     }
 
+    private ObservableList<Server> getObservableServerList(List<Server> servers) {
+        ObservableList<Server> serverObservableList = FXCollections.observableList(new ArrayList<>(servers));
+        serverObservableList.add(MANAGE_ALIASES_SERVER);
+        return serverObservableList;
+    }
+
     @Subscribe
     public void bwtStatus(BwtStatusEvent event) {
         if(!(event instanceof BwtSyncStatusEvent)) {
@@ -844,15 +904,28 @@ public class ServerPreferencesController extends PreferencesDetailController {
         });
     }
 
-    private static class UrlHostConverter extends StringConverter<String> {
+    private static class ServerCell extends ListCell<Server> {
         @Override
-        public String toString(String serverUrl) {
+        protected void updateItem(Server server, boolean empty) {
-            return serverUrl == null || Protocol.getProtocol(serverUrl) == null ? "" : Protocol.getProtocol(serverUrl).getServerHostAndPort(serverUrl).getHost();
+            super.updateItem(server, empty);
-        }
+            if(server == null || empty) {
+                setText("");
+                setGraphic(null);
+            } else {
+                String serverAlias = server.getAlias();
 
-        @Override
+                if(server == MANAGE_ALIASES_SERVER) {
-        public String fromString(String string) {
+                    setText(serverAlias);
-            return null;
+                    setStyle("-fx-font-style: italic");
+                    setGraphic(null);
+                } else if(serverAlias != null) {
+                    setText(serverAlias);
+                    setGraphic(getGlyph(FontAwesome5.Glyph.TAG, null));
+                } else {
+                    setText(server.getHost());
+                    setGraphic(null);
+                }
+            }
         }
     }
 }

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

@@ -117,6 +117,7 @@
                     <MenuItem fx:id="findMixingPartner" mnemonicParsing="false" text="Find Mix Partner" onAction="#findMixingPartner"/>
                     <MenuItem fx:id="showPayNym" mnemonicParsing="false" text="Show PayNym" onAction="#showPayNym"/>
                     <SeparatorMenuItem />
+                    <Menu fx:id="switchServer" text="Switch Server"/>
                     <MenuItem styleClass="osxHide,windowsHide" mnemonicParsing="false" text="Install Udev Rules" onAction="#installUdevRules"/>
                     <CheckMenuItem fx:id="preventSleep" mnemonicParsing="false" text="Prevent Computer Sleep" onAction="#preventSleep"/>
                     <MenuItem fx:id="restart" mnemonicParsing="false" text="Restart" onAction="#restart" />

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

@@ -52,3 +52,7 @@
 #electrumUseSsl {
     -fx-padding: 4 0 2 0;
 }
+
+#coreHost .left-pane, #electrumHost .left-pane {
+    -fx-padding: 0 3 0 6;
+}