Merge branch 'master' of https://github.com/laanwj/bitcoin-qt

35 files changed, 932 insertions, 329 deletions

diff --git a/README.rst b/README.rst
index 16d03c3ab8..98add9f3c0 100644
--- a/README.rst
+++ b/README.rst
@@ -3,7 +3,7 @@ Bitcoin-qt: Qt4 based GUI replacement for Bitcoin
 
 **Warning** **Warning** **Warning**
 
-Pre-alpha stuff! I'm using this client myself on the production network, and I haven't noticed any glitches, but remember: always backup your wallet.
+Alpha version! I'm using this client myself on the production network, and I haven't noticed any glitches, but remember: always backup your wallet.
 Testing on the testnet is recommended.
 
 This has been implemented:
@@ -28,6 +28,8 @@ This has been implemented:
 
 - Progress bar on initial block download
 
+- Sendmany support in UI (send to multiple recipients as well)
+
 This has to be done:
 
 - Start at system start
diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index e1b855176d..dd7a399c6a 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -84,7 +84,9 @@ HEADERS += src/qt/bitcoingui.h \
     src/qt/overviewpage.h \
     src/qt/csvmodelwriter.h \
     src/qt/qtwin.h \
-    src/crypter.h
+    src/crypter.h \
+    src/qt/sendcoinsentry.h \
+    src/qt/qvalidatedlineedit.h
 SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \
     src/qt/transactiontablemodel.cpp \
     src/qt/addresstablemodel.cpp \
@@ -124,7 +126,9 @@ SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \
     src/qt/overviewpage.cpp \
     src/qt/csvmodelwriter.cpp \
     src/qt/qtwin.cpp \
-    src/crypter.cpp
+    src/crypter.cpp \
+    src/qt/sendcoinsentry.cpp \
+    src/qt/qvalidatedlineedit.cpp
 
 RESOURCES += \
     src/qt/bitcoin.qrc
@@ -135,7 +139,8 @@ FORMS += \
     src/qt/forms/aboutdialog.ui \
     src/qt/forms/editaddressdialog.ui \
     src/qt/forms/transactiondescdialog.ui \
-    src/qt/forms/overviewpage.ui
+    src/qt/forms/overviewpage.ui \
+    src/qt/forms/sendcoinsentry.ui
 
 CODECFORTR = UTF-8
 TRANSLATIONS = src/qt/locale/bitcoin_nl.ts src/qt/locale/bitcoin_de.ts
diff --git a/doc/assets-attribution.txt b/doc/assets-attribution.txt
index f58b0da40c..c03233790e 100644
--- a/doc/assets-attribution.txt
+++ b/doc/assets-attribution.txt
@@ -14,7 +14,7 @@ Designer: FatCow Web Hosting
 License: Creative Commons Attribution (by)
 Site: http://findicons.com/icon/163938/book_open
 
-Icon: src/qt/res/icons/connect*.png
+Icon: src/qt/res/icons/connect*.png, src/qt/res/icons/synced.png
 Icon Pack: Human-O2
 Designer: schollidesign
 License: GNU/GPL
@@ -29,7 +29,7 @@ License: You are free to do with these icons as you wish, including selling,
 Icon: src/qt/res/icons/configure.png, src/qt/res/icons/quit.png,
       src/qt/res/icons/editcopy.png, src/qt/res/icons/editpaste.png,
       src/qt/res/icons/add.png, src/qt/res/icons/edit.png,
-      src/qt/res/icons/editdelete.png
+      src/qt/res/icons/remove.png (edited)
 Designer: http://www.everaldo.com
 Icon Pack: Crystal SVG
 License: LGPL
@@ -52,9 +52,8 @@ Designer: Jack Cai
 License: Creative Commons Attribution No Derivatives (by-nd)
 Site: http://findicons.com/icon/175944/home?id=176221#
 
-Icon: src/qt/res/icons/synced.png, 
-      src/qt/res/icons/notsynced.png
-Icon Pack: Gloss: Basic
-Designer: Momenticons
-License: Creative Commons Attribution (by) 
-Site: http://www.momenticons.com/
+Icon:  scripts/img/reload.xcf (modified),src/qt/res/movies/update_spinner.mng
+Icon Pack: Kids
+Designer: Everaldo (Everaldo Coelho)
+License: GNU/GPL 
+Site: http://findicons.com/icon/17102/reload?id=17102
diff --git a/scripts/img/reload.xcf b/scripts/img/reload.xcf
new file mode 100644
index 0000000000..c3ce165adb
--- /dev/null
+++ b/scripts/img/reload.xcf
diff --git a/scripts/img/reload_scaled.png b/scripts/img/reload_scaled.png
new file mode 100644
index 0000000000..9a45b1bd1d
--- /dev/null
+++ b/scripts/img/reload_scaled.png
diff --git a/scripts/make_spinner.py b/scripts/make_spinner.py
new file mode 100755
index 0000000000..c1f94c12c2
--- /dev/null
+++ b/scripts/make_spinner.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# W.J. van der Laan, 2011
+# Make spinning .mng animation from a .png
+# Requires imagemagick 6.7+
+from __future__ import division
+from os import path
+from PIL import Image
+from subprocess import Popen
+
+SRC='img/reload_scaled.png'
+DST='../src/qt/res/movies/update_spinner.mng'
+TMPDIR='/tmp'
+TMPNAME='tmp-%03i.png'
+NUMFRAMES=35
+FRAMERATE=10.0
+CONVERT='convert'
+CLOCKWISE=True
+
+im_src = Image.open(SRC)
+
+if CLOCKWISE:
+    im_src = im_src.transpose(Image.FLIP_LEFT_RIGHT)
+
+def frame_to_filename(frame):
+    return path.join(TMPDIR, TMPNAME % frame)
+
+frame_files = []
+for frame in xrange(NUMFRAMES):
+    rotation = (frame + 0.5) / NUMFRAMES * 360.0
+    if CLOCKWISE:
+        rotation = -rotation
+    im_new = im_src.rotate(rotation, Image.BICUBIC)
+    outfile = frame_to_filename(frame)
+    im_new.save(outfile, 'png')
+    frame_files.append(outfile)
+
+p = Popen([CONVERT, "-delay", str(FRAMERATE), "-dispose", "2"] + frame_files + [DST])
+p.communicate()
+
+
+
diff --git a/src/main.cpp b/src/main.cpp
index e3ad35044e..3a482e7cfa 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -32,7 +32,7 @@ map<COutPoint, CInPoint> mapNextTx;
 map<uint256, CBlockIndex*> mapBlockIndex;
 uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
 CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
-const int nTotalBlocksEstimate = 134444; // Conservative estimate of total nr of blocks on main chain
+int nTotalBlocksEstimate = 134444; // Conservative estimate of total nr of blocks on main chain
 const int nInitialBlockThreshold = 120; // Regard blocks up until N-threshold as "initial download"
 CBlockIndex* pindexGenesisBlock = NULL;
 int nBestHeight = -1;
@@ -1869,6 +1869,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         pfrom->fSuccessfullyConnected = true;
 
         printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
+        if(pfrom->nStartingHeight > nTotalBlocksEstimate)
+        {
+            nTotalBlocksEstimate = pfrom->nStartingHeight;
+        }
     }
 
 
diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index 4578ca740f..125ceebb33 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -1,5 +1,6 @@
 #include "addresstablemodel.h"
 #include "guiutil.h"
+#include "walletmodel.h"
 
 #include "headers.h"
 
@@ -72,8 +73,8 @@ struct AddressTablePriv
     }
 };
 
-AddressTableModel::AddressTableModel(CWallet *wallet, QObject *parent) :
-    QAbstractTableModel(parent),wallet(wallet),priv(0)
+AddressTableModel::AddressTableModel(CWallet *wallet, WalletModel *parent) :
+    QAbstractTableModel(parent),walletModel(parent),wallet(wallet),priv(0)
 {
     columns << tr("Label") << tr("Address");
     priv = new AddressTablePriv(wallet);
@@ -150,6 +151,8 @@ bool AddressTableModel::setData(const QModelIndex & index, const QVariant & valu
         return false;
     AddressTableEntry *rec = static_cast<AddressTableEntry*>(index.internalPointer());
 
+    editStatus = OK;
+
     if(role == Qt::EditRole)
     {
         switch(index.column())
@@ -160,8 +163,11 @@ bool AddressTableModel::setData(const QModelIndex & index, const QVariant & valu
             break;
         case Address:
             // Refuse to set invalid address
-            if(!validateAddress(value.toString()))
+            if(!walletModel->validateAddress(value.toString()))
+            {
+                editStatus = INVALID_ADDRESS;
                 return false;
+            }
             // Double-check that we're not overwriting receiving address
             if(rec->type == AddressTableEntry::Sending)
             {
@@ -240,13 +246,22 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
     std::string strLabel = label.toStdString();
     std::string strAddress = address.toStdString();
 
+    editStatus = OK;
+
+
     if(type == Send)
     {
+        if(!walletModel->validateAddress(address))
+        {
+            editStatus = INVALID_ADDRESS;
+            return QString();
+        }
         // Check for duplicate
         CRITICAL_BLOCK(wallet->cs_mapAddressBook)
         {
             if(wallet->mapAddressBook.count(strAddress))
             {
+                editStatus = DUPLICATE_ADDRESS;
                 return QString();
             }
         }
@@ -291,13 +306,6 @@ void AddressTableModel::update()
 
 }
 
-bool AddressTableModel::validateAddress(const QString &address)
-{
-    uint160 hash160 = 0;
-
-    return AddressToHash160(address.toStdString(), hash160);
-}
-
 /* Look up label for address in address book, if not found return empty string.
  */
 QString AddressTableModel::labelForAddress(const QString &address) const
diff --git a/src/qt/addresstablemodel.h b/src/qt/addresstablemodel.h
index d48e786621..296fa58054 100644
--- a/src/qt/addresstablemodel.h
+++ b/src/qt/addresstablemodel.h
@@ -6,12 +6,13 @@
 
 class AddressTablePriv;
 class CWallet;
+class WalletModel;
 
 class AddressTableModel : public QAbstractTableModel
 {
     Q_OBJECT
 public:
-    explicit AddressTableModel(CWallet *wallet, QObject *parent = 0);
+    explicit AddressTableModel(CWallet *wallet, WalletModel *parent = 0);
     ~AddressTableModel();
 
     enum ColumnIndex {
@@ -19,9 +20,16 @@ public:
         Address = 1  /* Bitcoin address */
     };
 
-    enum {
+    enum RoleIndex {
         TypeRole = Qt::UserRole
-    } RoleIndex;
+    };
+
+    // Return status of last edit/insert operation
+    enum EditStatus {
+        OK = 0,
+        INVALID_ADDRESS = 1,
+        DUPLICATE_ADDRESS = 2
+    };
 
     static const QString Send; /* Send addres */
     static const QString Receive; /* Receive address */
@@ -45,10 +53,6 @@ public:
      */
     void updateList();
 
-    /* Check address for validity
-     */
-    bool validateAddress(const QString &address);
-
     /* Look up label for address in address book, if not found return empty string.
      */
     QString labelForAddress(const QString &address) const;
@@ -58,10 +62,14 @@ public:
      */
     int lookupAddress(const QString &address) const;
 
+    EditStatus getEditStatus() const { return editStatus; }
+
 private:
+    WalletModel *walletModel;
     CWallet *wallet;
     AddressTablePriv *priv;
     QStringList columns;
+    EditStatus editStatus;
 
 signals:
     void defaultAddressChanged(const QString &address);
diff --git a/src/qt/bitcoin.qrc b/src/qt/bitcoin.qrc
index 1522ce61e3..5199a8ea31 100644
--- a/src/qt/bitcoin.qrc
+++ b/src/qt/bitcoin.qrc
@@ -25,14 +25,16 @@
         <file alias="bitcoin_testnet">res/icons/bitcoin_testnet.png</file>
         <file alias="toolbar_testnet">res/icons/toolbar_testnet.png</file>
         <file alias="edit">res/icons/edit.png</file>
-        <file alias="editdelete">res/icons/editdelete.png</file>
         <file alias="history">res/icons/history.png</file>
         <file alias="overview">res/icons/overview.png</file>
         <file alias="export">res/icons/export.png</file>
         <file alias="synced">res/icons/synced.png</file>
-        <file alias="notsynced">res/icons/notsynced.png</file>
+        <file alias="remove">res/icons/remove.png</file>
     </qresource>
     <qresource prefix="/images">
         <file alias="about">res/images/about.png</file>
     </qresource>
+    <qresource prefix="/movies">
+        <file alias="update_spinner">res/movies/update_spinner.mng</file>
+    </qresource>
 </RCC>
diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
index 4308a893c2..373877808f 100644
--- a/src/qt/bitcoinaddressvalidator.cpp
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -57,5 +57,11 @@ QValidator::State BitcoinAddressValidator::validate(QString &input, int &pos) co
         }
     }
 
+    // Empty address is "intermediate" input
+    if(input.isEmpty())
+    {
+        state = QValidator::Intermediate;
+    }
+
     return state;
 }
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index 1359a32b87..d545dc52e8 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -1,4 +1,5 @@
 #include "bitcoinamountfield.h"
+#include "qvalidatedlineedit.h"
 
 #include <QLabel>
 #include <QLineEdit>
@@ -9,12 +10,12 @@
 BitcoinAmountField::BitcoinAmountField(QWidget *parent):
         QWidget(parent), amount(0), decimals(0)
 {
-    amount = new QLineEdit(this);
+    amount = new QValidatedLineEdit(this);
     amount->setValidator(new QRegExpValidator(QRegExp("[0-9]+"), this));
     amount->setAlignment(Qt::AlignRight|Qt::AlignVCenter);
     amount->installEventFilter(this);
     amount->setMaximumWidth(100);
-    decimals = new QLineEdit(this);
+    decimals = new QValidatedLineEdit(this);
     decimals->setValidator(new QRegExpValidator(QRegExp("[0-9]+"), this));
     decimals->setMaxLength(8);
     decimals->setAlignment(Qt::AlignLeft|Qt::AlignVCenter);
@@ -29,8 +30,9 @@ BitcoinAmountField::BitcoinAmountField(QWidget *parent):
     layout->addStretch(1);
     layout->setContentsMargins(0,0,0,0);
 
-    setFocusPolicy(Qt::TabFocus);
     setLayout(layout);
+
+    setFocusPolicy(Qt::TabFocus);
     setFocusProxy(amount);
 
     // If one if the widgets changes, the combined content changes as well
@@ -53,10 +55,28 @@ void BitcoinAmountField::setText(const QString &text)
     }
 }
 
+bool BitcoinAmountField::validate()
+{
+    bool valid = true;
+    if(amount->text().isEmpty())
+    {
+        amount->setValid(false);
+        valid = false;
+    }
+    if(decimals->text().isEmpty())
+    {
+        decimals->setValid(false);
+        valid = false;
+    }
+    return valid;
+}
+
 QString BitcoinAmountField::text() const
 {
     if(amount->text().isEmpty() || decimals->text().isEmpty())
+    {
         return QString();
+    }
     return amount->text() + QString(".") + decimals->text();
 }
 
@@ -75,3 +95,10 @@ bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
     }
     return false;
 }
+
+QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
+{
+    QWidget::setTabOrder(prev, amount);
+    QWidget::setTabOrder(amount, decimals);
+    return decimals;
+}
diff --git a/src/qt/bitcoinamountfield.h b/src/qt/bitcoinamountfield.h
index 67304c8b3a..2a0ef4bd99 100644
--- a/src/qt/bitcoinamountfield.h
+++ b/src/qt/bitcoinamountfield.h
@@ -4,7 +4,7 @@
 #include <QWidget>
 
 QT_BEGIN_NAMESPACE
-class QLineEdit;
+class QValidatedLineEdit;
 QT_END_NAMESPACE
 
 // Coin amount entry widget with separate parts for whole
@@ -18,6 +18,10 @@ public:
 
     void setText(const QString &text);
     QString text() const;
+    bool validate();
+    // Qt messes up the tab chain by default in some cases (issue http://bugreports.qt.nokia.com/browse/QTBUG-10907)
+    // Hence we have to set it up manually
+    QWidget *setupTabChain(QWidget *prev);
 
 signals:
     void textChanged();
@@ -27,8 +31,8 @@ protected:
     bool eventFilter(QObject *object, QEvent *event);
 
 private:
-    QLineEdit *amount;
-    QLineEdit *decimals;
+    QValidatedLineEdit *amount;
+    QValidatedLineEdit *decimals;
 };
 
 
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 9ee178ac64..c4462dd40c 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -36,6 +36,7 @@
 #include <QProgressBar>
 #include <QStackedWidget>
 #include <QDateTime>
+#include <QMovie>
 
 #include <QDebug>
 
@@ -55,10 +56,14 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
 
     // Menus
     QMenu *file = menuBar()->addMenu("&File");
-    file->addAction(optionsAction);
+    file->addAction(sendCoinsAction);
+    file->addAction(receiveCoinsAction);
     file->addSeparator();
     file->addAction(quitAction);
     
+    QMenu *settings = menuBar()->addMenu("&Settings");
+    settings->addAction(optionsAction);
+
     QMenu *help = menuBar()->addMenu("&Help");
     help->addAction(aboutAction);
     
@@ -103,17 +108,35 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     // Create status bar
     statusBar();
 
+    // Status bar "Connections" notification
+    QFrame *frameConnections = new QFrame();
+    frameConnections->setFrameStyle(QFrame::Panel | QFrame::Sunken);
+    frameConnections->setMinimumWidth(150);
+    frameConnections->setMaximumWidth(150);
+    QHBoxLayout *frameConnectionsLayout = new QHBoxLayout(frameConnections);
+    frameConnectionsLayout->setContentsMargins(3,0,3,0);
+    frameConnectionsLayout->setSpacing(3);
+    labelConnectionsIcon = new QLabel();
+    labelConnectionsIcon->setToolTip(tr("Number of connections to other clients"));
+    frameConnectionsLayout->addWidget(labelConnectionsIcon);
     labelConnections = new QLabel();
-    labelConnections->setFrameStyle(QFrame::Panel | QFrame::Sunken);
-    labelConnections->setMinimumWidth(150);
-    labelConnections->setMaximumWidth(150);
     labelConnections->setToolTip(tr("Number of connections to other clients"));
-
+    frameConnectionsLayout->addWidget(labelConnections);
+    frameConnectionsLayout->addStretch();
+
+    // Status bar "Blocks" notification
+    QFrame *frameBlocks = new QFrame();
+    frameBlocks->setFrameStyle(QFrame::Panel | QFrame::Sunken);
+    frameBlocks->setMinimumWidth(150);
+    frameBlocks->setMaximumWidth(150);
+    QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
+    frameBlocksLayout->setContentsMargins(3,0,3,0);
+    frameBlocksLayout->setSpacing(3);
+    labelBlocksIcon = new QLabel();
+    frameBlocksLayout->addWidget(labelBlocksIcon);
     labelBlocks = new QLabel();
-    labelBlocks->setFrameStyle(QFrame::Panel | QFrame::Sunken);
-    labelBlocks->setMinimumWidth(150);
-    labelBlocks->setMaximumWidth(150);
-    labelBlocks->setToolTip(tr("Number of blocks in the block chain"));
+    frameBlocksLayout->addWidget(labelBlocks);
+    frameBlocksLayout->addStretch();
 
     // Progress bar for blocks download
     progressBarLabel = new QLabel(tr("Synchronizing with network..."));
@@ -124,11 +147,13 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
 
     statusBar()->addWidget(progressBarLabel);
     statusBar()->addWidget(progressBar);
-    statusBar()->addPermanentWidget(labelConnections);
-    statusBar()->addPermanentWidget(labelBlocks);
+    statusBar()->addPermanentWidget(frameConnections);
+    statusBar()->addPermanentWidget(frameBlocks);
 
     createTrayIcon();
 
+    syncIconMovie = new QMovie(":/movies/update_spinner", "mng", this);
+
     gotoOverviewPage();
 }
 
@@ -281,37 +306,39 @@ void BitcoinGUI::setNumConnections(int count)
     case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
     default: icon = ":/icons/connect_4"; break;
     }
-    labelConnections->setTextFormat(Qt::RichText);
-    labelConnections->setText("<img src=\""+icon+"\"> " + tr("%n connection(s)", "", count));
+    labelConnectionsIcon->setPixmap(QIcon(icon).pixmap(16,16));
+    labelConnections->setText(tr("%n connection(s)", "", count));
 }
 
 void BitcoinGUI::setNumBlocks(int count)
 {
     int total = clientModel->getTotalBlocksEstimate();
+    QString tooltip;
+
     if(count < total)
     {
         progressBarLabel->setVisible(true);
         progressBar->setVisible(true);
         progressBar->setMaximum(total);
         progressBar->setValue(count);
+        tooltip = tr("Downloaded %1 of %2 blocks of transaction history.").arg(count).arg(total);
     }
     else
     {
         progressBarLabel->setVisible(false);
         progressBar->setVisible(false);
+        tooltip = tr("Downloaded %1 blocks of transaction history.").arg(count);
     }
 
     QDateTime now = QDateTime::currentDateTime();
     QDateTime lastBlockDate = clientModel->getLastBlockDate();
     int secs = lastBlockDate.secsTo(now);
     QString text;
-    QString icon = ":/icons/notsynced";
 
-    // "Up to date" icon, and outdated icon
-    if(secs < 30*60)
+    // Represent time from last generated block in human readable text
+    if(secs < 60)
     {
-        text = "Up to date";
-        icon = ":/icons/synced";
+        text = tr("%n second(s) ago","",secs);
     }
     else if(secs < 60*60)
     {
@@ -326,9 +353,33 @@ void BitcoinGUI::setNumBlocks(int count)
         text = tr("%n day(s) ago","",secs/(60*60*24));
     }
 
-    labelBlocks->setText("<img src=\""+icon+"\"> " + text);
-    labelBlocks->setToolTip(tr("Downloaded %n block(s) of transaction history. Last block was generated %1.", "", count)
-                            .arg(QLocale::system().toString(lastBlockDate)));
+    // In the label we want to be less specific
+    QString labelText = text;
+    bool spinning = true;
+    if(secs < 30*60)
+    {
+        labelText = "Up to date";
+        spinning = false;
+    }
+
+    tooltip += QString("\n");
+    tooltip += tr("Last received block was generated %1.").arg(text);
+
+    if(spinning)
+    {
+        labelBlocksIcon->setMovie(syncIconMovie);
+        syncIconMovie->start();
+    }
+    else
+    {
+        labelBlocksIcon->setPixmap(QIcon(":/icons/synced").pixmap(16,16));
+    }
+    labelBlocks->setText(labelText);
+
+    labelBlocksIcon->setToolTip(tooltip);
+    labelBlocks->setToolTip(tooltip);
+    progressBarLabel->setToolTip(tooltip);
+    progressBar->setToolTip(tooltip);
 }
 
 void BitcoinGUI::error(const QString &title, const QString &message)
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 95e0eb70fe..4fc17dd36f 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -57,6 +57,7 @@ private:
     QLabel *labelConnections;
     QLabel *labelConnectionsIcon;
     QLabel *labelBlocks;
+    QLabel *labelBlocksIcon;
     QLabel *progressBarLabel;
     QProgressBar *progressBar;
 
@@ -74,6 +75,8 @@ private:
     QSystemTrayIcon *trayIcon;
     TransactionView *transactionView;
 
+    QMovie *syncIconMovie;
+
     void createActions();
     QWidget *createTabs();
     void createTrayIcon();
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index 8885b4cb5b..c147aa5a6e 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -10,7 +10,8 @@
 #include <QDateTime>
 
 ClientModel::ClientModel(CWallet *wallet, QObject *parent) :
-    QObject(parent), wallet(wallet), optionsModel(0)
+    QObject(parent), wallet(wallet), optionsModel(0),
+    cachedNumConnections(0), cachedNumBlocks(0)
 {
     // Until signal notifications is built into the bitcoin core,
     //  simply update everything after polling using a timer.
@@ -38,11 +39,16 @@ QDateTime ClientModel::getLastBlockDate() const
 
 void ClientModel::update()
 {
-    // Plainly emit all signals for now. To be more efficient this should check
-    //   whether the values actually changed first, although it'd be even better if these
-    //   were events coming in from the bitcoin core.
-    emit numConnectionsChanged(getNumConnections());
-    emit numBlocksChanged(getNumBlocks());
+    int newNumConnections = getNumConnections();
+    int newNumBlocks = getNumBlocks();
+
+    if(cachedNumConnections != newNumConnections)
+        emit numConnectionsChanged(newNumConnections);
+    if(cachedNumBlocks != newNumBlocks)
+        emit numBlocksChanged(newNumBlocks);
+
+    cachedNumConnections = newNumConnections;
+    cachedNumBlocks = newNumBlocks;
 }
 
 bool ClientModel::isTestNet() const
diff --git a/src/qt/clientmodel.h b/src/qt/clientmodel.h
index 6c2c275cef..f7ad14c28b 100644
--- a/src/qt/clientmodel.h
+++ b/src/qt/clientmodel.h
@@ -42,6 +42,9 @@ private:
 
     OptionsModel *optionsModel;
 
+    int cachedNumConnections;
+    int cachedNumBlocks;
+
 signals:
     void numConnectionsChanged(int count);
     void numBlocksChanged(int count);
diff --git a/src/qt/editaddressdialog.cpp b/src/qt/editaddressdialog.cpp
index 7ea5638b4b..a0b27e83bb 100644
--- a/src/qt/editaddressdialog.cpp
+++ b/src/qt/editaddressdialog.cpp
@@ -79,23 +79,22 @@ QString EditAddressDialog::saveCurrentRow()
 
 void EditAddressDialog::accept()
 {
-    if(mode == NewSendingAddress || mode == EditSendingAddress)
+    if(saveCurrentRow().isEmpty())
     {
-        // For sending addresses, check validity
-        // Not needed for receiving addresses, as those are generated
-        if(!model->validateAddress(ui->addressEdit->text()))
+        switch(model->getEditStatus())
         {
+        case AddressTableModel::DUPLICATE_ADDRESS:
+            QMessageBox::warning(this, windowTitle(),
+                tr("The entered address \"%1\" is already in the address book.").arg(ui->addressEdit->text()),
+                QMessageBox::Ok, QMessageBox::Ok);
+            break;
+        case AddressTableModel::INVALID_ADDRESS:
             QMessageBox::warning(this, windowTitle(),
                 tr("The entered address \"%1\" is not a valid bitcoin address.").arg(ui->addressEdit->text()),
                 QMessageBox::Ok, QMessageBox::Ok);
             return;
         }
-    }
-    if(saveCurrentRow().isEmpty())
-    {
-        QMessageBox::warning(this, windowTitle(),
-            tr("The entered address \"%1\" is already in the address book.").arg(ui->addressEdit->text()),
-            QMessageBox::Ok, QMessageBox::Ok);
+
         return;
     }
     QDialog::accept();
diff --git a/src/qt/forms/addressbookpage.ui b/src/qt/forms/addressbookpage.ui
index d3feedb5e0..fb098c8280 100644
--- a/src/qt/forms/addressbookpage.ui
+++ b/src/qt/forms/addressbookpage.ui
@@ -89,7 +89,7 @@
        </property>
        <property name="icon">
         <iconset resource="../bitcoin.qrc">
-         <normaloff>:/icons/editdelete</normaloff>:/icons/editdelete</iconset>
+         <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
        </property>
       </widget>
      </item>
diff --git a/src/qt/forms/sendcoinsdialog.ui b/src/qt/forms/sendcoinsdialog.ui
index 8009bd2b94..547582e8df 100644
--- a/src/qt/forms/sendcoinsdialog.ui
+++ b/src/qt/forms/sendcoinsdialog.ui
@@ -15,146 +15,46 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <spacer name="verticalSpacer_2">
-     <property name="orientation">
-      <enum>Qt::Vertical</enum>
+    <widget class="QScrollArea" name="scrollArea">
+     <property name="widgetResizable">
+      <bool>true</bool>
      </property>
-     <property name="sizeType">
-      <enum>QSizePolicy::Preferred</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>20</width>
-       <height>12</height>
-      </size>
-     </property>
-    </spacer>
-   </item>
-   <item>
-    <layout class="QGridLayout" name="gridLayout">
-     <property name="spacing">
-      <number>12</number>
-     </property>
-     <item row="5" column="0">
-      <widget class="QLabel" name="label">
-       <property name="text">
-        <string>A&amp;mount:</string>
-       </property>
-       <property name="alignment">
-        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
-       </property>
-       <property name="buddy">
-        <cstring>payAmount</cstring>
-       </property>
-      </widget>
-     </item>
-     <item row="3" column="0">
-      <widget class="QLabel" name="label_2">
-       <property name="text">
-        <string>Pay &amp;To:</string>
-       </property>
-       <property name="alignment">
-        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
-       </property>
-       <property name="buddy">
-        <cstring>payTo</cstring>
-       </property>
-      </widget>
-     </item>
-     <item row="5" column="1">
-      <widget class="BitcoinAmountField" name="payAmount"/>
-     </item>
-     <item row="4" column="1">
-      <layout class="QHBoxLayout" name="horizontalLayout_2">
-       <property name="spacing">
-        <number>0</number>
-       </property>
-       <item>
-        <widget class="QLineEdit" name="addAsLabel">
-         <property name="enabled">
-          <bool>true</bool>
-         </property>
-         <property name="toolTip">
-          <string>Enter a label for this address to add it to your address book</string>
-         </property>
-        </widget>
-       </item>
-      </layout>
-     </item>
-     <item row="4" column="0">
-      <widget class="QLabel" name="label_4">
-       <property name="text">
-        <string>&amp;Label:</string>
-       </property>
-       <property name="alignment">
-        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
-       </property>
-       <property name="buddy">
-        <cstring>addAsLabel</cstring>
-       </property>
-      </widget>
-     </item>
-     <item row="3" column="1">
-      <layout class="QHBoxLayout" name="horizontalLayout_3">
-       <property name="spacing">
+     <widget class="QWidget" name="scrollAreaWidgetContents">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>666</width>
+        <height>162</height>
+       </rect>
+      </property>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <property name="margin">
         <number>0</number>
        </property>
        <item>
-        <widget class="QLineEdit" name="payTo">
-         <property name="toolTip">
-          <string>The address to send the payment to  (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)</string>
+        <layout class="QVBoxLayout" name="entries">
+         <property name="spacing">
+          <number>6</number>
          </property>
-         <property name="maxLength">
-          <number>34</number>
-         </property>
-        </widget>
+        </layout>
        </item>
        <item>
-        <widget class="QPushButton" name="addressBookButton">
-         <property name="toolTip">
-          <string>Look up adress in address book</string>
-         </property>
-         <property name="text">
-          <string/>
-         </property>
-         <property name="icon">
-          <iconset resource="../bitcoin.qrc">
-           <normaloff>:/icons/address-book</normaloff>:/icons/address-book</iconset>
-         </property>
-         <property name="shortcut">
-          <string>Alt+A</string>
-         </property>
-         <property name="autoDefault">
-          <bool>false</bool>
-         </property>
-         <property name="flat">
-          <bool>false</bool>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QPushButton" name="pasteButton">
-         <property name="toolTip">
-          <string>Paste address from system clipboard</string>
-         </property>
-         <property name="text">
-          <string/>
-         </property>
-         <property name="icon">
-          <iconset resource="../bitcoin.qrc">
-           <normaloff>:/icons/editpaste</normaloff>:/icons/editpaste</iconset>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
          </property>
-         <property name="shortcut">
-          <string>Alt+P</string>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
          </property>
-         <property name="autoDefault">
-          <bool>false</bool>
-         </property>
-        </widget>
+        </spacer>
        </item>
       </layout>
-     </item>
-    </layout>
+     </widget>
+    </widget>
    </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
@@ -162,6 +62,17 @@
       <number>12</number>
      </property>
      <item>
+      <widget class="QPushButton" name="addButton">
+       <property name="text">
+        <string>&amp;Add recipient...</string>
+       </property>
+       <property name="icon">
+        <iconset resource="../bitcoin.qrc">
+         <normaloff>:/icons/add</normaloff>:/icons/add</iconset>
+       </property>
+      </widget>
+     </item>
+     <item>
       <spacer name="horizontalSpacer">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
@@ -199,37 +110,8 @@
      </item>
     </layout>
    </item>
-   <item>
-    <spacer name="verticalSpacer">
-     <property name="orientation">
-      <enum>Qt::Vertical</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>20</width>
-       <height>40</height>
-      </size>
-     </property>
-    </spacer>
-   </item>
   </layout>
  </widget>
- <customwidgets>
-  <customwidget>
-   <class>BitcoinAmountField</class>
-   <extends>QLineEdit</extends>
-   <header>bitcoinamountfield.h</header>
-   <container>1</container>
-  </customwidget>
- </customwidgets>
- <tabstops>
-  <tabstop>payTo</tabstop>
-  <tabstop>addressBookButton</tabstop>
-  <tabstop>pasteButton</tabstop>
-  <tabstop>addAsLabel</tabstop>
-  <tabstop>payAmount</tabstop>
-  <tabstop>sendButton</tabstop>
- </tabstops>
  <resources>
   <include location="../bitcoin.qrc"/>
  </resources>
diff --git a/src/qt/forms/sendcoinsentry.ui b/src/qt/forms/sendcoinsentry.ui
new file mode 100644
index 0000000000..2dca6b74b1
--- /dev/null
+++ b/src/qt/forms/sendcoinsentry.ui
@@ -0,0 +1,175 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SendCoinsEntry</class>
+ <widget class="QFrame" name="SendCoinsEntry">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>729</width>
+    <height>136</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <property name="frameShape">
+   <enum>QFrame::StyledPanel</enum>
+  </property>
+  <property name="frameShadow">
+   <enum>QFrame::Sunken</enum>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <property name="spacing">
+    <number>12</number>
+   </property>
+   <item row="5" column="0">
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>A&amp;mount:</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+     </property>
+     <property name="buddy">
+      <cstring>payAmount</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="0">
+    <widget class="QLabel" name="label_2">
+     <property name="text">
+      <string>Pay &amp;To:</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+     </property>
+     <property name="buddy">
+      <cstring>payTo</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="1">
+    <widget class="BitcoinAmountField" name="payAmount"/>
+   </item>
+   <item row="4" column="1">
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <property name="spacing">
+      <number>0</number>
+     </property>
+     <item>
+      <widget class="QValidatedLineEdit" name="addAsLabel">
+       <property name="enabled">
+        <bool>true</bool>
+       </property>
+       <property name="toolTip">
+        <string>Enter a label for this address to add it to your address book</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="4" column="0">
+    <widget class="QLabel" name="label_4">
+     <property name="text">
+      <string>&amp;Label:</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+     </property>
+     <property name="buddy">
+      <cstring>addAsLabel</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="1">
+    <layout class="QHBoxLayout" name="horizontalLayout_3">
+     <property name="spacing">
+      <number>0</number>
+     </property>
+     <item>
+      <widget class="QValidatedLineEdit" name="payTo">
+       <property name="toolTip">
+        <string>The address to send the payment to  (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)</string>
+       </property>
+       <property name="maxLength">
+        <number>34</number>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="addressBookButton">
+       <property name="toolTip">
+        <string>Look up adress in address book</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../bitcoin.qrc">
+         <normaloff>:/icons/address-book</normaloff>:/icons/address-book</iconset>
+       </property>
+       <property name="shortcut">
+        <string>Alt+A</string>
+       </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
+       <property name="flat">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="pasteButton">
+       <property name="toolTip">
+        <string>Paste address from system clipboard</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../bitcoin.qrc">
+         <normaloff>:/icons/editpaste</normaloff>:/icons/editpaste</iconset>
+       </property>
+       <property name="shortcut">
+        <string>Alt+P</string>
+       </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="deleteButton">
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../bitcoin.qrc">
+         <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>BitcoinAmountField</class>
+   <extends>QLineEdit</extends>
+   <header>bitcoinamountfield.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>QValidatedLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header>qvalidatedlineedit.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../bitcoin.qrc"/>
+ </resources>
+ <connections/>
+</ui>
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index cdd1a74d98..59f49625bd 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -2,7 +2,7 @@
 #define GUICONSTANTS_H
 
 /* milliseconds between model updates */
-static const int MODEL_UPDATE_DELAY = 250;
+static const int MODEL_UPDATE_DELAY = 500;
 
 /* size of cache */
 static const unsigned int WALLET_CACHE_SIZE = 100;
diff --git a/src/qt/qvalidatedlineedit.cpp b/src/qt/qvalidatedlineedit.cpp
new file mode 100644
index 0000000000..4b5acd8b07
--- /dev/null
+++ b/src/qt/qvalidatedlineedit.cpp
@@ -0,0 +1,37 @@
+#include "qvalidatedlineedit.h"
+
+QValidatedLineEdit::QValidatedLineEdit(QWidget *parent) :
+    QLineEdit(parent), valid(true)
+{
+    connect(this, SIGNAL(textChanged(QString)), this, SLOT(markValid()));
+}
+
+void QValidatedLineEdit::setValid(bool valid)
+{
+    if(valid == this->valid)
+    {
+        return;
+    }
+
+    if(valid)
+    {
+        setStyleSheet("");
+    }
+    else
+    {
+        setStyleSheet("background:#FF8080");
+    }
+    this->valid = valid;
+}
+
+void QValidatedLineEdit::focusInEvent(QFocusEvent *evt)
+{
+    // Clear invalid flag on focus
+    setValid(true);
+    QLineEdit::focusInEvent(evt);
+}
+
+void QValidatedLineEdit::markValid()
+{
+    setValid(true);
+}
diff --git a/src/qt/qvalidatedlineedit.h b/src/qt/qvalidatedlineedit.h
new file mode 100644
index 0000000000..9fc026fab1
--- /dev/null
+++ b/src/qt/qvalidatedlineedit.h
@@ -0,0 +1,27 @@
+#ifndef QVALIDATEDLINEEDIT_H
+#define QVALIDATEDLINEEDIT_H
+
+#include <QLineEdit>
+
+// Line edit that can be marked as "invalid". When marked as invalid,
+// it will get a red background until it is focused.
+class QValidatedLineEdit : public QLineEdit
+{
+    Q_OBJECT
+public:
+    explicit QValidatedLineEdit(QWidget *parent = 0);
+
+protected:
+    void focusInEvent(QFocusEvent *evt);
+
+private:
+    bool valid;
+
+public slots:
+    void setValid(bool valid);
+
+private slots:
+    void markValid();
+};
+
+#endif // QVALIDATEDLINEEDIT_H
diff --git a/src/qt/res/icons/editdelete.png b/src/qt/res/icons/editdelete.png
deleted file mode 100644
index 945d221eea..0000000000
--- a/src/qt/res/icons/editdelete.png
+++ /dev/null
diff --git a/src/qt/res/icons/remove.png b/src/qt/res/icons/remove.png
new file mode 100644
index 0000000000..a44b6d130b
--- /dev/null
+++ b/src/qt/res/icons/remove.png
diff --git a/src/qt/res/icons/synced.png b/src/qt/res/icons/synced.png
index 910fc396ed..8e428b6a70 100644
--- a/src/qt/res/icons/synced.png
+++ b/src/qt/res/icons/synced.png
diff --git a/src/qt/res/movies/update_spinner.mng b/src/qt/res/movies/update_spinner.mng
new file mode 100644
index 0000000000..99b1b14135
--- /dev/null
+++ b/src/qt/res/movies/update_spinner.mng
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 01d68dc0af..38a0a65520 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -1,43 +1,40 @@
 #include "sendcoinsdialog.h"
 #include "ui_sendcoinsdialog.h"
 #include "walletmodel.h"
-#include "addresstablemodel.h"
 #include "guiutil.h"
-
 #include "addressbookpage.h"
 #include "optionsmodel.h"
+#include "sendcoinsentry.h"
+
 
-#include <QApplication>
-#include <QClipboard>
 #include <QMessageBox>
 #include <QLocale>
 #include <QDebug>
-#include <QMessageBox>
 
-SendCoinsDialog::SendCoinsDialog(QWidget *parent, const QString &address) :
+SendCoinsDialog::SendCoinsDialog(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::SendCoinsDialog),
     model(0)
 {
     ui->setupUi(this);
-#if QT_VERSION >= 0x040700
-    ui->payTo->setPlaceholderText(tr("Enter a Bitcoin address (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)"));
-    ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
-#endif
 
-    GUIUtil::setupAddressWidget(ui->payTo, this);
+    addEntry();
 
-    // Set initial send-to address if provided
-    if(!address.isEmpty())
-    {
-        ui->payTo->setText(address);
-        ui->payAmount->setFocus();
-    }
+    connect(ui->addButton, SIGNAL(clicked()), this, SLOT(addEntry()));
 }
 
 void SendCoinsDialog::setModel(WalletModel *model)
 {
     this->model = model;
+
+    for(int i = 0; i < ui->entries->count(); ++i)
+    {
+        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
+        if(entry)
+        {
+            entry->setModel(model);
+        }
+    }
 }
 
 SendCoinsDialog::~SendCoinsDialog()
@@ -47,26 +44,38 @@ SendCoinsDialog::~SendCoinsDialog()
 
 void SendCoinsDialog::on_sendButton_clicked()
 {
-    bool valid;
-    QString payAmount = ui->payAmount->text();
-    QString label;
-    qint64 payAmountParsed;
-
-    valid = GUIUtil::parseMoney(payAmount, &payAmountParsed);
+    QList<SendCoinsRecipient> recipients;
+    bool valid = true;
+    for(int i = 0; i < ui->entries->count(); ++i)
+    {
+        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
+        if(entry)
+        {
+            if(entry->validate())
+            {
+                recipients.append(entry->getValue());
+            }
+            else
+            {
+                valid = false;
+            }
+        }
+    }
 
-    if(!valid || payAmount.isEmpty())
+    if(!valid || recipients.isEmpty())
     {
-        QMessageBox::warning(this, tr("Send Coins"),
-            tr("Must fill in an amount to pay."),
-            QMessageBox::Ok, QMessageBox::Ok);
         return;
     }
 
-    // Add address to address book under label, if specified
-    label = ui->addAsLabel->text();
+    // Format confirmation message
+    QStringList formatted;
+    foreach(const SendCoinsRecipient &rcp, recipients)
+    {
+        formatted.append(tr("%1 BTC to %2 (%3)").arg(GUIUtil::formatMoney(rcp.amount), rcp.label, rcp.address));
+    }
 
     QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm send coins"),
-                          tr("Are you sure you want to send %1 BTC to %2 (%3)?").arg(GUIUtil::formatMoney(payAmountParsed), label, ui->payTo->text()),
+                          tr("Are you sure you want to send %1?").arg(formatted.join(tr(" and "))),
           QMessageBox::Yes|QMessageBox::Cancel,
           QMessageBox::Cancel);
 
@@ -75,32 +84,45 @@ void SendCoinsDialog::on_sendButton_clicked()
         return;
     }
 
-    switch(model->sendCoins(ui->payTo->text(), payAmountParsed, label))
+    WalletModel::SendCoinsReturn sendstatus = model->sendCoins(recipients);
+    switch(sendstatus.status)
     {
     case WalletModel::InvalidAddress:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("The recepient address is not valid, please recheck."),
             QMessageBox::Ok, QMessageBox::Ok);
-        ui->payTo->setFocus();
         break;
     case WalletModel::InvalidAmount:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("The amount to pay must be larger than 0."),
             QMessageBox::Ok, QMessageBox::Ok);
-        ui->payAmount->setFocus();
         break;
     case WalletModel::AmountExceedsBalance:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("Amount exceeds your balance"),
             QMessageBox::Ok, QMessageBox::Ok);
-        ui->payAmount->setFocus();
         break;
     case WalletModel::AmountWithFeeExceedsBalance:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("Total exceeds your balance when the %1 transaction fee is included").
-            arg(GUIUtil::formatMoney(model->getOptionsModel()->getTransactionFee())),
+            arg(GUIUtil::formatMoney(sendstatus.fee)),
+            QMessageBox::Ok, QMessageBox::Ok);
+        break;
+    case WalletModel::DuplicateAddress:
+        QMessageBox::warning(this, tr("Send Coins"),
+            tr("Duplicate address found, can only send to each address once in one send operation"),
+            QMessageBox::Ok, QMessageBox::Ok);
+        break;
+    case WalletModel::TransactionCreationFailed:
+        QMessageBox::warning(this, tr("Send Coins"),
+            tr("Error: Transaction creation failed  "),
+            QMessageBox::Ok, QMessageBox::Ok);
+        break;
+        break;
+    case WalletModel::TransactionCommitFailed:
+        QMessageBox::warning(this, tr("Send Coins"),
+            tr("Error: The transaction was rejected.  This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here."),
             QMessageBox::Ok, QMessageBox::Ok);
-        ui->payAmount->setFocus();
         break;
     case WalletModel::OK:
         accept();
@@ -108,34 +130,23 @@ void SendCoinsDialog::on_sendButton_clicked()
     }
 }
 
-void SendCoinsDialog::on_pasteButton_clicked()
+void SendCoinsDialog::clear()
 {
-    // Paste text from clipboard into recipient field
-    ui->payTo->setText(QApplication::clipboard()->text());
-}
+    // Remove entries until only one left
+    while(ui->entries->count() > 1)
+    {
+        delete ui->entries->takeAt(0)->widget();
+    }
 
-void SendCoinsDialog::on_addressBookButton_clicked()
-{
-    AddressBookPage dlg(AddressBookPage::ForSending, AddressBookPage::SendingTab, this);
-    dlg.setModel(model->getAddressTableModel());
-    if(dlg.exec())
+    // Reset the entry that is left to empty
+    SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(0)->widget());
+    if(entry)
     {
-        ui->payTo->setText(dlg.getReturnValue());
-        ui->payAmount->setFocus();
+        entry->clear();
     }
-}
 
-void SendCoinsDialog::on_payTo_textChanged(const QString &address)
-{
-    ui->addAsLabel->setText(model->getAddressTableModel()->labelForAddress(address));
-}
+    updateRemoveEnabled();
 
-void SendCoinsDialog::clear()
-{
-    ui->payTo->setText(QString());
-    ui->addAsLabel->setText(QString());
-    ui->payAmount->setText(QString());
-    ui->payTo->setFocus();
     ui->sendButton->setDefault(true);
 }
 
@@ -148,3 +159,52 @@ void SendCoinsDialog::accept()
 {
     clear();
 }
+
+void SendCoinsDialog::addEntry()
+{
+    SendCoinsEntry *entry = new SendCoinsEntry(this);
+    entry->setModel(model);
+    ui->entries->addWidget(entry);
+    connect(entry, SIGNAL(removeEntry(SendCoinsEntry*)), this, SLOT(removeEntry(SendCoinsEntry*)));
+
+    updateRemoveEnabled();
+
+    // Focus the field, so that entry can start immediately
+    entry->clear();
+}
+
+void SendCoinsDialog::updateRemoveEnabled()
+{
+    // Remove buttons are enabled as soon as there is more than one send-entry
+    bool enabled = (ui->entries->count() > 1);
+    for(int i = 0; i < ui->entries->count(); ++i)
+    {
+        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
+        if(entry)
+        {
+            entry->setRemoveEnabled(enabled);
+        }
+    }
+    setupTabChain(0);
+}
+
+void SendCoinsDialog::removeEntry(SendCoinsEntry* entry)
+{
+    delete entry;
+    updateRemoveEnabled();
+}
+
+QWidget *SendCoinsDialog::setupTabChain(QWidget *prev)
+{
+    for(int i = 0; i < ui->entries->count(); ++i)
+    {
+        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
+        if(entry)
+        {
+            prev = entry->setupTabChain(prev);
+        }
+    }
+    QWidget::setTabOrder(prev, ui->addButton);
+    QWidget::setTabOrder(ui->addButton, ui->sendButton);
+    return ui->sendButton;
+}
diff --git a/src/qt/sendcoinsdialog.h b/src/qt/sendcoinsdialog.h
index 46814af466..0f90be8165 100644
--- a/src/qt/sendcoinsdialog.h
+++ b/src/qt/sendcoinsdialog.h
@@ -7,31 +7,37 @@ namespace Ui {
     class SendCoinsDialog;
 }
 class WalletModel;
+class SendCoinsEntry;
 
 class SendCoinsDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit SendCoinsDialog(QWidget *parent = 0, const QString &address = "");
+    explicit SendCoinsDialog(QWidget *parent = 0);
     ~SendCoinsDialog();
 
     void setModel(WalletModel *model);
 
+    // Qt messes up the tab chain by default in some cases (issue http://bugreports.qt.nokia.com/browse/QTBUG-10907)
+    // Hence we have to set it up manually
+    QWidget *setupTabChain(QWidget *prev);
+
 public slots:
     void clear();
     void reject();
     void accept();
+    void addEntry();
+    void updateRemoveEnabled();
 
 private:
     Ui::SendCoinsDialog *ui;
     WalletModel *model;
 
 private slots:
-    void on_payTo_textChanged(const QString &address);
-    void on_addressBookButton_clicked();
-    void on_pasteButton_clicked();
     void on_sendButton_clicked();
+
+    void removeEntry(SendCoinsEntry* entry);
 };
 
 #endif // SENDCOINSDIALOG_H
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
new file mode 100644
index 0000000000..6e87e9cf99
--- /dev/null
+++ b/src/qt/sendcoinsentry.cpp
@@ -0,0 +1,119 @@
+#include "sendcoinsentry.h"
+#include "ui_sendcoinsentry.h"
+#include "guiutil.h"
+#include "addressbookpage.h"
+#include "walletmodel.h"
+#include "addresstablemodel.h"
+
+#include "qapplication.h"
+#include "qclipboard.h"
+
+#include <QDebug>
+
+SendCoinsEntry::SendCoinsEntry(QWidget *parent) :
+    QFrame(parent),
+    ui(new Ui::SendCoinsEntry),
+    model(0)
+{
+    ui->setupUi(this);
+
+#if QT_VERSION >= 0x040700
+    ui->payTo->setPlaceholderText(tr("Enter a Bitcoin address (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)"));
+    ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
+#endif
+    setFocusPolicy(Qt::TabFocus);
+    setFocusProxy(ui->payTo);
+
+    GUIUtil::setupAddressWidget(ui->payTo, this);
+}
+
+SendCoinsEntry::~SendCoinsEntry()
+{
+    delete ui;
+}
+
+void SendCoinsEntry::on_pasteButton_clicked()
+{
+    // Paste text from clipboard into recipient field
+    ui->payTo->setText(QApplication::clipboard()->text());
+}
+
+void SendCoinsEntry::on_addressBookButton_clicked()
+{
+    AddressBookPage dlg(AddressBookPage::ForSending, AddressBookPage::SendingTab, this);
+    dlg.setModel(model->getAddressTableModel());
+    if(dlg.exec())
+    {
+        ui->payTo->setText(dlg.getReturnValue());
+        ui->payAmount->setFocus();
+    }
+}
+
+void SendCoinsEntry::on_payTo_textChanged(const QString &address)
+{
+    ui->addAsLabel->setText(model->getAddressTableModel()->labelForAddress(address));
+}
+
+void SendCoinsEntry::setModel(WalletModel *model)
+{
+    this->model = model;
+}
+
+void SendCoinsEntry::setRemoveEnabled(bool enabled)
+{
+    ui->deleteButton->setEnabled(enabled);
+}
+
+void SendCoinsEntry::clear()
+{
+    ui->payTo->clear();
+    ui->addAsLabel->clear();
+    ui->payAmount->setText(QString());
+    ui->payTo->setFocus();
+}
+
+void SendCoinsEntry::on_deleteButton_clicked()
+{
+    emit removeEntry(this);
+}
+
+bool SendCoinsEntry::validate()
+{
+    // Check input validity
+    bool retval = true;
+
+    if(!ui->payAmount->validate())
+    {
+        retval = false;
+    }
+
+    if(!ui->payTo->hasAcceptableInput() ||
+       (model && !model->validateAddress(ui->payTo->text())))
+    {
+        ui->payTo->setValid(false);
+        retval = false;
+    }
+
+    return retval;
+}
+
+SendCoinsRecipient SendCoinsEntry::getValue()
+{
+    SendCoinsRecipient rv;
+
+    rv.address = ui->payTo->text();
+    rv.label = ui->addAsLabel->text();
+    GUIUtil::parseMoney(ui->payAmount->text(), &rv.amount);
+
+    return rv;
+}
+
+QWidget *SendCoinsEntry::setupTabChain(QWidget *prev)
+{
+    QWidget::setTabOrder(prev, ui->payTo);
+    QWidget::setTabOrder(ui->payTo, ui->addressBookButton);
+    QWidget::setTabOrder(ui->addressBookButton, ui->pasteButton);
+    QWidget::setTabOrder(ui->pasteButton, ui->deleteButton);
+    QWidget::setTabOrder(ui->deleteButton, ui->addAsLabel);
+    return ui->payAmount->setupTabChain(ui->addAsLabel);
+}
diff --git a/src/qt/sendcoinsentry.h b/src/qt/sendcoinsentry.h
new file mode 100644
index 0000000000..55fd12a14b
--- /dev/null
+++ b/src/qt/sendcoinsentry.h
@@ -0,0 +1,45 @@
+#ifndef SENDCOINSENTRY_H
+#define SENDCOINSENTRY_H
+
+#include <QFrame>
+
+namespace Ui {
+    class SendCoinsEntry;
+}
+class WalletModel;
+class SendCoinsRecipient;
+
+class SendCoinsEntry : public QFrame
+{
+    Q_OBJECT
+
+public:
+    explicit SendCoinsEntry(QWidget *parent = 0);
+    ~SendCoinsEntry();
+
+    void setModel(WalletModel *model);
+    bool validate();
+    SendCoinsRecipient getValue();
+    // Qt messes up the tab chain by default in some cases (issue http://bugreports.qt.nokia.com/browse/QTBUG-10907)
+    // Hence we have to set it up manually
+    QWidget *setupTabChain(QWidget *prev);
+
+public slots:
+    void setRemoveEnabled(bool enabled);
+    void clear();
+
+signals:
+    void removeEntry(SendCoinsEntry *entry);
+
+private slots:
+    void on_deleteButton_clicked();
+    void on_payTo_textChanged(const QString &address);
+    void on_addressBookButton_clicked();
+    void on_pasteButton_clicked();
+
+private:
+    Ui::SendCoinsEntry *ui;
+    WalletModel *model;
+};
+
+#endif // SENDCOINSENTRY_H
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index afe095c977..4ff2e0ab15 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -7,10 +7,12 @@
 #include "headers.h"
 
 #include <QTimer>
+#include <QSet>
 
 WalletModel::WalletModel(CWallet *wallet, QObject *parent) :
     QObject(parent), wallet(wallet), optionsModel(0), addressTableModel(0),
-    transactionTableModel(0)
+    transactionTableModel(0),
+    cachedBalance(0), cachedUnconfirmedBalance(0), cachedNumTransactions(0)
 {
     // Until signal notifications is built into the bitcoin core,
     //  simply update everything after polling using a timer.
@@ -45,72 +47,122 @@ int WalletModel::getNumTransactions() const
 
 void WalletModel::update()
 {
-    // Plainly emit all signals for now. To be more efficient this should check
-    //   whether the values actually changed first, although it'd be even better if these
-    //   were events coming in from the bitcoin core.
-    emit balanceChanged(getBalance(), wallet->GetUnconfirmedBalance());
-    emit numTransactionsChanged(getNumTransactions());
+    qint64 newBalance = getBalance();
+    qint64 newUnconfirmedBalance = getUnconfirmedBalance();
+    int newNumTransactions = getNumTransactions();
+
+    if(cachedBalance != newBalance || cachedUnconfirmedBalance != newUnconfirmedBalance)
+        emit balanceChanged(newBalance, newUnconfirmedBalance);
+
+    if(cachedNumTransactions != newNumTransactions)
+        emit numTransactionsChanged(newNumTransactions);
+
+    cachedBalance = newBalance;
+    cachedUnconfirmedBalance = newUnconfirmedBalance;
+    cachedNumTransactions = newNumTransactions;
 
     addressTableModel->update();
 }
 
-WalletModel::StatusCode WalletModel::sendCoins(const QString &payTo, qint64 payAmount, const QString &addToAddressBookAs)
+bool WalletModel::validateAddress(const QString &address)
 {
     uint160 hash160 = 0;
-    bool valid = false;
 
-    if(!AddressToHash160(payTo.toUtf8().constData(), hash160))
+    return AddressToHash160(address.toStdString(), hash160);
+}
+
+WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipient> &recipients)
+{
+    qint64 total = 0;
+    QSet<QString> setAddress;
+    QString hex;
+
+    if(recipients.empty())
     {
-        return InvalidAddress;
+        return OK;
+    }
+
+    // Pre-check input data for validity
+    foreach(const SendCoinsRecipient &rcp, recipients)
+    {
+        uint160 hash160 = 0;
+
+        if(!AddressToHash160(rcp.address.toUtf8().constData(), hash160))
+        {
+            return InvalidAddress;
+        }
+        setAddress.insert(rcp.address);
+
+        if(rcp.amount <= 0)
+        {
+            return InvalidAmount;
+        }
+        total += rcp.amount;
     }
 
-    if(payAmount <= 0)
+    if(recipients.size() > setAddress.size())
     {
-        return InvalidAmount;
+        return DuplicateAddress;
     }
 
-    if(payAmount > getBalance())
+    if(total > getBalance())
     {
         return AmountExceedsBalance;
     }
 
-    if((payAmount + nTransactionFee) > getBalance())
+    if((total + nTransactionFee) > getBalance())
     {
-        return AmountWithFeeExceedsBalance;
+        return SendCoinsReturn(AmountWithFeeExceedsBalance, nTransactionFee);
     }
 
     CRITICAL_BLOCK(cs_main)
+    CRITICAL_BLOCK(wallet->cs_mapWallet)
     {
-        // Send to bitcoin address
+        // Sendmany
+        std::vector<std::pair<CScript, int64> > vecSend;
+        foreach(const SendCoinsRecipient &rcp, recipients)
+        {
+            CScript scriptPubKey;
+            scriptPubKey.SetBitcoinAddress(rcp.address.toStdString());
+            vecSend.push_back(make_pair(scriptPubKey, rcp.amount));
+        }
+
         CWalletTx wtx;
-        CScript scriptPubKey;
-        scriptPubKey << OP_DUP << OP_HASH160 << hash160 << OP_EQUALVERIFY << OP_CHECKSIG;
+        CReserveKey keyChange(wallet);
+        int64 nFeeRequired = 0;
+        bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired);
 
-        std::string strError = wallet->SendMoney(scriptPubKey, payAmount, wtx, true);
-        if (strError == "")
+        if(!fCreated)
         {
-            // OK
+            if((total + nFeeRequired) > wallet->GetBalance())
+            {
+                return SendCoinsReturn(AmountWithFeeExceedsBalance, nFeeRequired);
+            }
+            return TransactionCreationFailed;
         }
-        else if (strError == "ABORTED")
+        if(!ThreadSafeAskFee(nFeeRequired, tr("Sending...").toStdString(), NULL))
         {
             return Aborted;
         }
-        else
+        if(!wallet->CommitTransaction(wtx, keyChange))
         {
-            emit error(tr("Sending..."), QString::fromStdString(strError));
-            return MiscError;
+            return TransactionCommitFailed;
         }
+        hex = QString::fromStdString(wtx.GetHash().GetHex());
     }
 
     // Add addresses that we've sent to to the address book
-    std::string strAddress = payTo.toStdString();
-    CRITICAL_BLOCK(wallet->cs_mapAddressBook)
+    foreach(const SendCoinsRecipient &rcp, recipients)
     {
-        if (!wallet->mapAddressBook.count(strAddress))
-            wallet->SetAddressBookName(strAddress, addToAddressBookAs.toStdString());
+        std::string strAddress = rcp.address.toStdString();
+        CRITICAL_BLOCK(wallet->cs_mapAddressBook)
+        {
+            if (!wallet->mapAddressBook.count(strAddress))
+                wallet->SetAddressBookName(strAddress, rcp.label.toStdString());
+        }
     }
 
-    return OK;
+    return SendCoinsReturn(OK, 0, hex);
 }
 
 OptionsModel *WalletModel::getOptionsModel()
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 1105fb03fa..668d44632f 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -8,6 +8,13 @@ class AddressTableModel;
 class TransactionTableModel;
 class CWallet;
 
+struct SendCoinsRecipient
+{
+    QString address;
+    QString label;
+    qint64 amount;
+};
+
 // Interface to a Bitcoin wallet
 class WalletModel : public QObject
 {
@@ -22,6 +29,9 @@ public:
         InvalidAddress,
         AmountExceedsBalance,
         AmountWithFeeExceedsBalance,
+        DuplicateAddress,
+        TransactionCreationFailed,
+        TransactionCommitFailed,
         Aborted,
         MiscError
     };
@@ -34,8 +44,25 @@ public:
     qint64 getUnconfirmedBalance() const;
     int getNumTransactions() const;
 
-    /* Send coins */
-    StatusCode sendCoins(const QString &payTo, qint64 payAmount, const QString &addToAddressBookAs=QString());
+    // Check address for validity
+    bool validateAddress(const QString &address);
+
+    // Return status record for SendCoins
+    // fee is used in case status is "AmountWithFeeExceedsBalance"
+    // hex is filled with the transaction hash if status is "OK"
+    struct SendCoinsReturn
+    {
+        SendCoinsReturn(StatusCode status,
+                         qint64 fee=0,
+                         QString hex=QString()):
+            status(status), fee(fee), hex(hex) {}
+        StatusCode status;
+        qint64 fee;
+        QString hex;
+    };
+
+    // Send coins to list of recipients
+    SendCoinsReturn sendCoins(const QList<SendCoinsRecipient> &recipients);
 private:
     CWallet *wallet;
 
@@ -46,6 +73,10 @@ private:
     AddressTableModel *addressTableModel;
     TransactionTableModel *transactionTableModel;
 
+    qint64 cachedBalance;
+    qint64 cachedUnconfirmedBalance;
+    qint64 cachedNumTransactions;
+
 signals:
     void balanceChanged(qint64 balance, qint64 unconfirmedBalance);
     void numTransactionsChanged(int count);
diff --git a/src/serialize.h b/src/serialize.h
index cb3a3ea03c..857d0468d1 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -30,6 +30,7 @@ typedef unsigned long long  uint64;
 #endif
 
 #ifdef __WXMSW__
+#include <windows.h>
 // This is used to attempt to keep keying material out of swap
 // Note that VirtualLock does not provide this as a guarantee on Windows,
 // but, in practice, memory that has been VirtualLock'd almost never gets written to