diff --git a/CMakeLists.txt b/CMakeLists.txt
index d69e1e958..9ed54656f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -369,7 +369,7 @@ if (NOT LANGUAGES)
 		add_subdirectory(third)
 		if(QTQML)
 			#add_subdirectory(iethxi)
-			add_subdirectory(walleth)
+			#add_subdirectory(walleth)	// resurect once we want to submit ourselves to QML.
 		endif()
 	endif()
 endif()
diff --git a/alethzero/CMakeLists.txt b/alethzero/CMakeLists.txt
index 3eac0a0b6..c5d1aa0be 100644
--- a/alethzero/CMakeLists.txt
+++ b/alethzero/CMakeLists.txt
@@ -52,7 +52,7 @@ else ()
 endif ()
 
 qt5_use_modules(${EXECUTEABLE} Core)# Gui Widgets Network WebKit WebKitWidgets)
-target_link_libraries(${EXECUTEABLE} qethereum ethereum evm ethcore devcrypto secp256k1 gmp ${CRYPTOPP_LS} serpent lll evmface devcore)
+target_link_libraries(${EXECUTEABLE} webthree qethereum ethereum evm ethcore devcrypto secp256k1 gmp ${CRYPTOPP_LS} serpent lll evmface devcore)
 
 if (APPLE)
 	# First have qt5 install plugins and frameworks
diff --git a/alethzero/DownloadView.cpp b/alethzero/DownloadView.cpp
new file mode 100644
index 000000000..657727a6a
--- /dev/null
+++ b/alethzero/DownloadView.cpp
@@ -0,0 +1,83 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file DownloadView.cpp
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#include "DownloadView.h"
+
+#include <QtWidgets>
+#include <QtCore>
+#include <libethereum/DownloadMan.h>
+#include "Grapher.h"
+
+using namespace std;
+using namespace dev;
+using namespace dev::eth;
+
+DownloadView::DownloadView(QWidget* _p): QWidget(_p)
+{
+}
+
+void DownloadView::paintEvent(QPaintEvent*)
+{
+	QPainter p(this);
+
+	p.fillRect(rect(), Qt::white);
+	if (!m_man || m_man->chain().empty() || !m_man->subCount())
+		return;
+
+	double ratio = (double)rect().width() / rect().height();
+	if (ratio < 1)
+		ratio = 1 / ratio;
+	double n = min(rect().width(), rect().height()) / ceil(sqrt(m_man->chain().size() / ratio));
+
+//	QSizeF area(rect().width() / floor(rect().width() / n), rect().height() / floor(rect().height() / n));
+	QSizeF area(n, n);
+	QPointF pos(0, 0);
+
+	auto const& bg = m_man->blocksGot();
+
+	for (unsigned i = bg.all().first, ei = bg.all().second; i < ei; ++i)
+	{
+		int s = -2;
+		if (bg.contains(i))
+			s = -1;
+		else
+		{
+			unsigned h = 0;
+			m_man->foreachSub([&](DownloadSub const& sub)
+			{
+				if (sub.asked().contains(i))
+					s = h;
+				h++;
+			});
+		}
+		unsigned dh = 360 / m_man->subCount();
+		if (s == -2)
+			p.fillRect(QRectF(QPointF(pos) + QPointF(3 * area.width() / 8, 3 * area.height() / 8), area / 4), Qt::black);
+		else if (s == -1)
+			p.fillRect(QRectF(QPointF(pos) + QPointF(1 * area.width() / 8, 1 * area.height() / 8), area * 3 / 4), Qt::black);
+		else
+			p.fillRect(QRectF(QPointF(pos) + QPointF(1 * area.width() / 8, 1 * area.height() / 8), area * 3 / 4), QColor::fromHsv(s * dh, 64, 128));
+
+		pos.setX(pos.x() + n);
+		if (pos.x() >= rect().width() - n)
+			pos = QPoint(0, pos.y() + n);
+	}
+}
diff --git a/alethzero/DownloadView.h b/alethzero/DownloadView.h
new file mode 100644
index 000000000..22a11651c
--- /dev/null
+++ b/alethzero/DownloadView.h
@@ -0,0 +1,53 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file DownloadView.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#pragma once
+
+#ifdef Q_MOC_RUN
+#define BOOST_MPL_IF_HPP_INCLUDED
+#endif
+
+#include <list>
+#include <QtWidgets/QWidget>
+#ifndef Q_MOC_RUN
+#include <libethereum/Client.h>
+#endif
+
+namespace dev { namespace eth {
+struct MineInfo;
+class DownloadMan;
+}}
+
+class DownloadView: public QWidget
+{
+	Q_OBJECT
+
+public:
+	DownloadView(QWidget* _p = nullptr);
+
+	void setDownloadMan(dev::eth::DownloadMan const* _man) { m_man = _man; }
+
+protected:
+	virtual void paintEvent(QPaintEvent*);
+
+private:
+	dev::eth::DownloadMan const* m_man = nullptr;
+};
diff --git a/alethzero/Main.ui b/alethzero/Main.ui
index aa8a43f1c..dbc4bb144 100644
--- a/alethzero/Main.ui
+++ b/alethzero/Main.ui
@@ -132,6 +132,7 @@
     </property>
     <addaction name="upnp"/>
     <addaction name="usePast"/>
+    <addaction name="localNetworking"/>
     <addaction name="net"/>
     <addaction name="connect"/>
    </widget>
@@ -1432,6 +1433,39 @@ font-size: 14pt</string>
     </layout>
    </widget>
   </widget>
+  <widget class="QDockWidget" name="dockWidget_12">
+   <property name="features">
+    <set>QDockWidget::DockWidgetFeatureMask</set>
+   </property>
+   <property name="windowTitle">
+    <string>Blockchain Download</string>
+   </property>
+   <attribute name="dockWidgetArea">
+    <number>2</number>
+   </attribute>
+   <widget class="QWidget" name="dockWidgetContents_12">
+    <layout class="QHBoxLayout" name="horizontalLayout_8">
+     <property name="spacing">
+      <number>0</number>
+     </property>
+     <property name="leftMargin">
+      <number>0</number>
+     </property>
+     <property name="topMargin">
+      <number>0</number>
+     </property>
+     <property name="rightMargin">
+      <number>0</number>
+     </property>
+     <property name="bottomMargin">
+      <number>0</number>
+     </property>
+     <item>
+      <widget class="DownloadView" name="downloadView" native="true"/>
+     </item>
+    </layout>
+   </widget>
+  </widget>
   <action name="quit">
    <property name="text">
     <string>&amp;Quit</string>
@@ -1698,6 +1732,14 @@ font-size: 14pt</string>
     <string>Reserved Debug 1</string>
    </property>
   </action>
+  <action name="localNetworking">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Enable Local Addresses</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>
@@ -1712,6 +1754,12 @@ font-size: 14pt</string>
    <header>MiningView.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>DownloadView</class>
+   <extends>QWidget</extends>
+   <header>DownloadView.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>destination</tabstop>
diff --git a/alethzero/MainWin.cpp b/alethzero/MainWin.cpp
index e9cdf90bc..b4bbb8ca7 100644
--- a/alethzero/MainWin.cpp
+++ b/alethzero/MainWin.cpp
@@ -30,6 +30,7 @@
 #include <boost/algorithm/string.hpp>
 #include <libserpent/funcs.h>
 #include <libserpent/util.h>
+#include <libdevcrypto/FileSystem.h>
 #include <libethcore/Dagger.h>
 #include <liblll/Compiler.h>
 #include <liblll/CodeFragment.h>
@@ -38,50 +39,16 @@
 #include <libethereum/ExtVM.h>
 #include <libethereum/Client.h>
 #include <libethereum/EthereumHost.h>
+#include <libethereum/DownloadMan.h>
+#include "DownloadView.h"
 #include "MiningView.h"
 #include "BuildInfo.h"
 #include "MainWin.h"
 #include "ui_Main.h"
 using namespace std;
-
-// types
-using dev::bytes;
-using dev::bytesConstRef;
-using dev::h160;
-using dev::h256;
-using dev::u160;
-using dev::u256;
-using dev::Address;
-using dev::eth::BlockInfo;
-using dev::eth::Client;
-using dev::eth::Instruction;
-using dev::KeyPair;
-using dev::eth::NodeMode;
-using dev::eth::BlockChain;
-using dev::p2p::PeerInfo;
-using dev::RLP;
-using dev::Secret;
-using dev::eth::Transaction;
-using dev::eth::Executive;
-
-// functions
-using dev::toHex;
-using dev::fromHex;
-using dev::left160;
-using dev::right160;
-using dev::simpleDebugOut;
-using dev::toLog2;
-using dev::toString;
-using dev::operator<<;
-using dev::eth::units;
-using dev::eth::sha3;
-using dev::eth::compileLLL;
-using dev::eth::disassemble;
-using dev::eth::formatBalance;
-
-// vars
-using dev::g_logPost;
-using dev::g_logVerbosity;
+using namespace dev;
+using namespace dev::p2p;
+using namespace dev::eth;
 
 static void initUnits(QComboBox* _b)
 {
@@ -114,7 +81,6 @@ static QString fromRaw(dev::h256 _n, unsigned* _inc = nullptr)
 	return QString();
 }
 
-
 Address c_config = Address("661005d2720d855f1d9976f88bb10c1a3398c77f");
 
 Main::Main(QWidget *parent) :
@@ -133,26 +99,10 @@ Main::Main(QWidget *parent) :
 //		ui->log->addItem(QString::fromStdString(s));
 	};
 
-#if 0&&ETH_DEBUG
-	m_servers.append("192.168.0.10:30301");
-#else
-    int pocnumber = QString(dev::Version).section('.', 1, 1).toInt();
-	if (pocnumber == 5)
-        m_servers.push_back("54.72.69.180:30303");
-	else if (pocnumber == 6)
-		m_servers.push_back("54.76.56.74:30303");
-	else
-	{
-		connect(&m_webCtrl, &QNetworkAccessManager::finished, [&](QNetworkReply* _r)
-		{
-			m_servers = QString::fromUtf8(_r->readAll()).split("\n", QString::SkipEmptyParts);
-		});
-		QNetworkRequest r(QUrl("http://www.ethereum.org/servers.poc" + QString::number(pocnumber) + ".txt"));
-		r.setHeader(QNetworkRequest::UserAgentHeader, "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1712.0 Safari/537.36");
-		m_webCtrl.get(r);
-		srand(time(0));
-	}
+#if ETH_DEBUG
+	m_servers.append("localhost:30300");
 #endif
+	m_servers.append(QString::fromStdString(Host::pocHost() + ":30303"));
 
     cerr << "State root: " << BlockChain::genesis().stateRoot << endl;
     cerr << "Block Hash: " << sha3(BlockChain::createGenesisBlock()) << endl;
@@ -177,12 +127,12 @@ Main::Main(QWidget *parent) :
 	
 	connect(ui->ourAccounts->model(), SIGNAL(rowsMoved(const QModelIndex &, int, int, const QModelIndex &, int)), SLOT(ourAccountsRowsMoved()));
 
-	m_client.reset(new Client("AlethZero"));
+	m_webThree.reset(new WebThreeDirect(string("AlethZero/v") + dev::Version + "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM), getDataDir() + "/AlethZero", false, {"eth", "shh"}));
 
 	connect(ui->webView, &QWebView::loadStarted, [this]()
 	{
 		// NOTE: no need to delete as QETH_INSTALL_JS_NAMESPACE adopts it.
-		m_ethereum = new QEthereum(this, client(), owned());
+		m_ethereum = new QEthereum(this, ethereum(), owned());
 
 		QWebFrame* f = ui->webView->page()->mainFrame();
 		f->disconnect(SIGNAL(javaScriptWindowObjectCleared()));
@@ -226,6 +176,11 @@ Main::~Main()
 	writeSettings();
 }
 
+dev::p2p::NetworkPreferences Main::netPrefs() const
+{
+	return NetworkPreferences(ui->port->value(), ui->forceAddress->text().toStdString(), ui->upnp->isChecked(), ui->localNetworking->isChecked());
+}
+
 void Main::onKeysChanged()
 {
 	installBalancesWatch();
@@ -233,14 +188,14 @@ void Main::onKeysChanged()
 
 unsigned Main::installWatch(dev::eth::MessageFilter const& _tf, std::function<void()> const& _f)
 {
-	auto ret = client()->installWatch(_tf);
+	auto ret = ethereum()->installWatch(_tf);
 	m_handlers[ret] = _f;
 	return ret;
 }
 
 unsigned Main::installWatch(dev::h256 _tf, std::function<void()> const& _f)
 {
-	auto ret = client()->installWatch(_tf);
+	auto ret = ethereum()->installWatch(_tf);
 	m_handlers[ret] = _f;
 	return ret;
 }
@@ -255,14 +210,14 @@ void Main::installWatches()
 
 void Main::installNameRegWatch()
 {
-	client()->uninstallWatch(m_nameRegFilter);
-	m_nameRegFilter = installWatch(dev::eth::MessageFilter().altered((u160)client()->stateAt(c_config, 0)), [=](){ onNameRegChange(); });
+	ethereum()->uninstallWatch(m_nameRegFilter);
+	m_nameRegFilter = installWatch(dev::eth::MessageFilter().altered((u160)ethereum()->stateAt(c_config, 0)), [=](){ onNameRegChange(); });
 }
 
 void Main::installCurrenciesWatch()
 {
-	client()->uninstallWatch(m_currenciesFilter);
-	m_currenciesFilter = installWatch(dev::eth::MessageFilter().altered((u160)client()->stateAt(c_config, 1)), [=](){ onCurrenciesChange(); });
+	ethereum()->uninstallWatch(m_currenciesFilter);
+	m_currenciesFilter = installWatch(dev::eth::MessageFilter().altered((u160)ethereum()->stateAt(c_config, 1)), [=](){ onCurrenciesChange(); });
 }
 
 void Main::installBalancesWatch()
@@ -270,9 +225,9 @@ void Main::installBalancesWatch()
 	dev::eth::MessageFilter tf;
 
 	vector<Address> altCoins;
-	Address coinsAddr = right160(client()->stateAt(c_config, 1));
-	for (unsigned i = 0; i < client()->stateAt(coinsAddr, 0); ++i)
-		altCoins.push_back(right160(client()->stateAt(coinsAddr, i + 1)));
+	Address coinsAddr = right160(ethereum()->stateAt(c_config, 1));
+	for (unsigned i = 0; i < ethereum()->stateAt(coinsAddr, 0); ++i)
+		altCoins.push_back(right160(ethereum()->stateAt(coinsAddr, i + 1)));
 	for (auto i: m_myKeys)
 	{
 		tf.altered(i.address());
@@ -280,7 +235,7 @@ void Main::installBalancesWatch()
 			tf.altered(c, (u160)i.address());
 	}
 
-	client()->uninstallWatch(m_balancesFilter);
+	ethereum()->uninstallWatch(m_balancesFilter);
 	m_balancesFilter = installWatch(tf, [=](){ onBalancesChange(); });
 }
 
@@ -328,7 +283,7 @@ void Main::onNewPending()
 
 void Main::on_forceMining_triggered()
 {
-	client()->setForceMining(ui->forceMining->isChecked());
+	ethereum()->setForceMining(ui->forceMining->isChecked());
 }
 
 void Main::on_enableOptimizer_triggered()
@@ -422,11 +377,11 @@ QString Main::pretty(dev::Address _a) const
 {
 	h256 n;
 
-	if (h160 nameReg = (u160)client()->stateAt(c_config, 0))
-		n = client()->stateAt(nameReg, (u160)(_a));
+	if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0))
+		n = ethereum()->stateAt(nameReg, (u160)(_a));
 
 	if (!n)
-		n = client()->stateAt(m_nameReg, (u160)(_a));
+		n = ethereum()->stateAt(m_nameReg, (u160)(_a));
 
 	return fromRaw(n);
 }
@@ -452,11 +407,11 @@ Address Main::fromString(QString const& _a) const
 	memset(n.data() + sn.size(), 0, 32 - sn.size());
 	if (_a.size())
 	{
-		if (h160 nameReg = (u160)client()->stateAt(c_config, 0))
-			if (h256 a = client()->stateAt(nameReg, n))
+		if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0))
+			if (h256 a = ethereum()->stateAt(nameReg, n))
 				return right160(a);
 
-		if (h256 a = client()->stateAt(m_nameReg, n))
+		if (h256 a = ethereum()->stateAt(m_nameReg, n))
 			return right160(a);
 	}
 	if (_a.size() == 40)
@@ -484,11 +439,11 @@ QString Main::lookup(QString const& _a) const
 */
 
 	h256 ret;
-	if (h160 dnsReg = (u160)client()->stateAt(c_config, 4, 0))
-		ret = client()->stateAt(dnsReg, n);
+	if (h160 dnsReg = (u160)ethereum()->stateAt(c_config, 4, 0))
+		ret = ethereum()->stateAt(dnsReg, n);
 /*	if (!ret)
-		if (h160 nameReg = (u160)m_client->stateAt(c_config, 0, 0))
-			ret = m_client->stateAt(nameReg, n2);
+		if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0, 0))
+			ret = ethereum()->stateAt(nameReg, n2);
 */
 	if (ret && !((u256)ret >> 32))
 		return QString("%1.%2.%3.%4").arg((int)ret[28]).arg((int)ret[29]).arg((int)ret[30]).arg((int)ret[31]);
@@ -506,7 +461,7 @@ void Main::on_about_triggered()
 
 void Main::on_paranoia_triggered()
 {
-	client()->setParanoia(ui->paranoia->isChecked());
+	ethereum()->setParanoia(ui->paranoia->isChecked());
 }
 
 void Main::writeSettings()
@@ -525,6 +480,7 @@ void Main::writeSettings()
 	s.setValue("upnp", ui->upnp->isChecked());
 	s.setValue("forceAddress", ui->forceAddress->text());
 	s.setValue("usePast", ui->usePast->isChecked());
+	s.setValue("localNetworking", ui->localNetworking->isChecked());
 	s.setValue("forceMining", ui->forceMining->isChecked());
 	s.setValue("paranoia", ui->paranoia->isChecked());
 	s.setValue("showAll", ui->showAll->isChecked());
@@ -537,7 +493,7 @@ void Main::writeSettings()
 	s.setValue("privateChain", m_privateChain);
 	s.setValue("verbosity", ui->verbosity->value());
 
-	bytes d = client()->savePeers();
+	bytes d = m_webThree->savePeers();
 	if (d.size())
 		m_peers = QByteArray((char*)d.data(), (int)d.size());
 	s.setValue("peers", m_peers);
@@ -569,11 +525,12 @@ void Main::readSettings(bool _skipGeometry)
 				m_myKeys.append(KeyPair(k));
 		}
 	}
-	client()->setAddress(m_myKeys.back().address());
+	ethereum()->setAddress(m_myKeys.back().address());
 	m_peers = s.value("peers").toByteArray();
 	ui->upnp->setChecked(s.value("upnp", true).toBool());
 	ui->forceAddress->setText(s.value("forceAddress", "").toString());
 	ui->usePast->setChecked(s.value("usePast", true).toBool());
+	ui->localNetworking->setChecked(s.value("localNetworking", true).toBool());
 	ui->forceMining->setChecked(s.value("forceMining", false).toBool());
 	on_forceMining_triggered();
 	ui->paranoia->setChecked(s.value("paranoia", false).toBool());
@@ -665,17 +622,17 @@ void Main::on_nameReg_textChanged()
 
 void Main::on_preview_triggered()
 {
-	client()->setDefault(ui->preview->isChecked() ? 0 : -1);
+	ethereum()->setDefault(ui->preview->isChecked() ? 0 : -1);
 	refreshAll();
 }
 
 void Main::refreshMining()
 {
-	dev::eth::MineProgress p = client()->miningProgress();
-	ui->mineStatus->setText(client()->isMining() ? QString("%1s @ %2kH/s").arg(p.ms / 1000).arg(p.ms ? p.hashes / p.ms : 0) : "Not mining");
+	dev::eth::MineProgress p = ethereum()->miningProgress();
+	ui->mineStatus->setText(ethereum()->isMining() ? QString("%1s @ %2kH/s").arg(p.ms / 1000).arg(p.ms ? p.hashes / p.ms : 0) : "Not mining");
 	if (!ui->miningView->isVisible())
 		return;
-	list<dev::eth::MineInfo> l = client()->miningHistory();
+	list<dev::eth::MineInfo> l = ethereum()->miningHistory();
 	static unsigned lh = 0;
 	if (p.hashes < lh)
 		ui->miningView->resetStats();
@@ -694,12 +651,12 @@ void Main::refreshBalances()
 	ui->ourAccounts->clear();
 	u256 totalBalance = 0;
 	map<Address, tuple<QString, u256, u256>> altCoins;
-	Address coinsAddr = right160(client()->stateAt(c_config, 1));
-	for (unsigned i = 0; i < client()->stateAt(coinsAddr, 0); ++i)
+	Address coinsAddr = right160(ethereum()->stateAt(c_config, 1));
+	for (unsigned i = 0; i < ethereum()->stateAt(coinsAddr, 0); ++i)
 	{
-		auto n = client()->stateAt(coinsAddr, i + 1);
-		auto addr = right160(client()->stateAt(coinsAddr, n));
-		auto denom = client()->stateAt(coinsAddr, sha3(h256(n).asBytes()));
+		auto n = ethereum()->stateAt(coinsAddr, i + 1);
+		auto addr = right160(ethereum()->stateAt(coinsAddr, n));
+		auto denom = ethereum()->stateAt(coinsAddr, sha3(h256(n).asBytes()));
 		if (denom == 0)
 			denom = 1;
 //		cdebug << n << addr << denom << sha3(h256(n).asBytes());
@@ -707,13 +664,13 @@ void Main::refreshBalances()
 	}
 	for (auto i: m_myKeys)
 	{
-		u256 b = client()->balanceAt(i.address());
-		(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(b).c_str()).arg(render(i.address())).arg((unsigned)client()->countAt(i.address())), ui->ourAccounts))
+		u256 b = ethereum()->balanceAt(i.address());
+		(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(b).c_str()).arg(render(i.address())).arg((unsigned)ethereum()->countAt(i.address())), ui->ourAccounts))
 			->setData(Qt::UserRole, QByteArray((char const*)i.address().data(), Address::size));
 		totalBalance += b;
 
 		for (auto& c: altCoins)
-			get<1>(c.second) += (u256)client()->stateAt(c.first, (u160)i.address());
+			get<1>(c.second) += (u256)ethereum()->stateAt(c.first, (u160)i.address());
 	}
 
 	QString b;
@@ -729,12 +686,12 @@ void Main::refreshBalances()
 
 void Main::refreshNetwork()
 {
-	auto ps = client()->peers();
+	auto ps = web3()->peers();
 
 	ui->peerCount->setText(QString::fromStdString(toString(ps.size())) + " peer(s)");
 	ui->peers->clear();
 	for (PeerInfo const& i: ps)
-		ui->peers->addItem(QString("%3 ms - %1:%2 - %4").arg(i.host.c_str()).arg(i.port).arg(chrono::duration_cast<chrono::milliseconds>(i.lastPing).count()).arg(i.clientVersion.c_str()));
+		ui->peers->addItem(QString("%3 ms - %1:%2 - %4 %5").arg(i.host.c_str()).arg(i.port).arg(chrono::duration_cast<chrono::milliseconds>(i.lastPing).count()).arg(i.clientVersion.c_str()).arg(QString::fromStdString(toString(i.caps))));
 }
 
 void Main::refreshAll()
@@ -751,7 +708,7 @@ void Main::refreshPending()
 {
 	cwatch << "refreshPending()";
 	ui->transactionQueue->clear();
-	for (Transaction const& t: client()->pending())
+	for (Transaction const& t: ethereum()->pending())
 	{
 		QString s = t.receiveAddress ?
 			QString("%2 %5> %3: %1 [%4]")
@@ -759,7 +716,7 @@ void Main::refreshPending()
 				.arg(render(t.safeSender()))
 				.arg(render(t.receiveAddress))
 				.arg((unsigned)t.nonce)
-				.arg(client()->codeAt(t.receiveAddress).size() ? '*' : '-') :
+				.arg(ethereum()->codeAt(t.receiveAddress).size() ? '*' : '-') :
 			QString("%2 +> %3: %1 [%4]")
 				.arg(formatBalance(t.value).c_str())
 				.arg(render(t.safeSender()))
@@ -775,16 +732,16 @@ void Main::refreshAccounts()
 	ui->accounts->clear();
 	ui->contracts->clear();
 	for (auto n = 0; n < 2; ++n)
-		for (auto i: client()->addresses())
+		for (auto i: ethereum()->addresses())
 		{
 			auto r = render(i);
 			if (r.contains('(') == !n)
 			{
 				if (n == 0 || ui->showAllAccounts->isChecked())
-					(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(client()->balanceAt(i)).c_str()).arg(r).arg((unsigned)client()->countAt(i)), ui->accounts))
+					(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(ethereum()->balanceAt(i)).c_str()).arg(r).arg((unsigned)ethereum()->countAt(i)), ui->accounts))
 						->setData(Qt::UserRole, QByteArray((char const*)i.data(), Address::size));
-				if (client()->codeAt(i).size())
-					(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(client()->balanceAt(i)).c_str()).arg(r).arg((unsigned)client()->countAt(i)), ui->contracts))
+				if (ethereum()->codeAt(i).size())
+					(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(ethereum()->balanceAt(i)).c_str()).arg(r).arg((unsigned)ethereum()->countAt(i)), ui->contracts))
 						->setData(Qt::UserRole, QByteArray((char const*)i.data(), Address::size));
 			}
 		}
@@ -794,7 +751,7 @@ void Main::refreshDestination()
 {
 	cwatch << "refreshDestination()";
 	QString s;
-	for (auto i: client()->addresses())
+	for (auto i: ethereum()->addresses())
 		if ((s = pretty(i)).size())
 			// A namereg address
 			if (ui->destination->findText(s, Qt::MatchExactly | Qt::MatchCaseSensitive) == -1)
@@ -807,8 +764,8 @@ void Main::refreshDestination()
 void Main::refreshBlockCount()
 {
 	cwatch << "refreshBlockCount()";
-	auto d = client()->blockChain().details();
-	auto diff = BlockInfo(client()->blockChain().block()).difficulty;
+	auto d = ethereum()->blockChain().details();
+	auto diff = BlockInfo(ethereum()->blockChain().block()).difficulty;
 	ui->blockCount->setText(QString("%6 #%1 @%3 T%2 N%4 D%5").arg(d.number).arg(toLog2(d.totalDifficulty)).arg(toLog2(diff)).arg(dev::eth::c_protocolVersion).arg(dev::eth::c_databaseVersion).arg(m_privateChain.size() ? "[" + m_privateChain + "] " : "testnet"));
 }
 
@@ -839,7 +796,7 @@ static bool transactionMatch(string const& _f, Transaction const& _t)
 
 void Main::on_turboMining_triggered()
 {
-	client()->setTurboMining(ui->turboMining->isChecked());
+	ethereum()->setTurboMining(ui->turboMining->isChecked());
 }
 
 void Main::refreshBlockChain()
@@ -850,7 +807,7 @@ void Main::refreshBlockChain()
 	ui->blocks->clear();
 
 	string filter = ui->blockChainFilter->text().toLower().toStdString();
-	auto const& bc = client()->blockChain();
+	auto const& bc = ethereum()->blockChain();
 	unsigned i = (ui->showAll->isChecked() || !filter.empty()) ? (unsigned)-1 : 10;
 	for (auto h = bc.currentHash(); h != bc.genesisHash() && bc.details(h) && i; h = bc.details(h).parent, --i)
 	{
@@ -877,7 +834,7 @@ void Main::refreshBlockChain()
 						.arg(render(t.safeSender()))
 						.arg(render(t.receiveAddress))
 						.arg((unsigned)t.nonce)
-						.arg(client()->codeAt(t.receiveAddress).size() ? '*' : '-') :
+						.arg(ethereum()->codeAt(t.receiveAddress).size() ? '*' : '-') :
 					QString("    %2 +> %3: %1 [%4]")
 						.arg(formatBalance(t.value).c_str())
 						.arg(render(t.safeSender()))
@@ -926,6 +883,9 @@ void Main::timerEvent(QTimerEvent*)
 	if (interval / 100 % 2 == 0)
 		refreshMining();
 
+	if (interval / 100 % 2 == 0 && m_webThree->ethereum()->isSyncing())
+		ui->downloadView->update();
+
 	if (m_logChanged)
 	{
 		m_logLock.lock();
@@ -948,7 +908,7 @@ void Main::timerEvent(QTimerEvent*)
 		m_ethereum->poll();
 
 	for (auto const& i: m_handlers)
-		if (client()->checkWatch(i.first))
+		if (ethereum()->checkWatch(i.first))
 			i.second();
 }
 
@@ -1019,9 +979,9 @@ void Main::on_transactionQueue_currentItemChanged()
 
 	stringstream s;
 	int i = ui->transactionQueue->currentRow();
-	if (i >= 0 && i < (int)client()->pending().size())
+	if (i >= 0 && i < (int)ethereum()->pending().size())
 	{
-		Transaction tx(client()->pending()[i]);
+		Transaction tx(ethereum()->pending()[i]);
 		auto ss = tx.safeSender();
 		h256 th = sha3(rlpList(ss, tx.nonce));
 		s << "<h3>" << th << "</h3>";
@@ -1049,7 +1009,7 @@ void Main::on_transactionQueue_currentItemChanged()
 //		s << "Pre: " << fs.rootHash() << "<br/>";
 //		s << "Post: <b>" << ts.rootHash() << "</b>";
 
-		s << renderDiff(client()->diff(i, 0));
+		s << renderDiff(ethereum()->diff(i, 0));
 	}
 
 	ui->pendingInfo->setHtml(QString::fromStdString(s.str()));
@@ -1076,7 +1036,7 @@ void Main::on_inject_triggered()
 {
 	QString s = QInputDialog::getText(this, "Inject Transaction", "Enter transaction dump in hex");
 	bytes b = fromHex(s.toStdString());
-	client()->inject(&b);
+	ethereum()->inject(&b);
 }
 
 void Main::on_blocks_currentItemChanged()
@@ -1090,8 +1050,8 @@ void Main::on_blocks_currentItemChanged()
 		auto hba = item->data(Qt::UserRole).toByteArray();
 		assert(hba.size() == 32);
 		auto h = h256((byte const*)hba.data(), h256::ConstructFromPointer);
-		auto details = client()->blockChain().details(h);
-		auto blockData = client()->blockChain().block(h);
+		auto details = ethereum()->blockChain().details(h);
+		auto blockData = ethereum()->blockChain().block(h);
 		auto block = RLP(blockData);
 		BlockInfo info(blockData);
 
@@ -1115,7 +1075,7 @@ void Main::on_blocks_currentItemChanged()
 			s << "<br/>Bloom: <b>" << details.bloom << "</b>";
 			s << "<br/>Transactions: <b>" << block[1].itemCount() << "</b> @<b>" << info.transactionsRoot << "</b>";
 			s << "<br/>Uncles: <b>" << block[2].itemCount() << "</b> @<b>" << info.sha3Uncles << "</b>";
-			s << "<br/>Pre: <b>" << BlockInfo(client()->blockChain().block(info.parentHash)).stateRoot << "</b>";
+			s << "<br/>Pre: <b>" << BlockInfo(ethereum()->blockChain().block(info.parentHash)).stateRoot << "</b>";
 			for (auto const& i: block[1])
 				s << "<br/>" << sha3(i[0].data()).abridged() << ": <b>" << i[1].toHash<h256>() << "</b> [<b>" << i[2].toInt<u256>() << "</b> used]";
 			s << "<br/>Post: <b>" << info.stateRoot << "</b>";
@@ -1151,7 +1111,7 @@ void Main::on_blocks_currentItemChanged()
 				if (tx.data.size())
 					s << dev::memDump(tx.data, 16, true);
 			}
-			s << renderDiff(client()->diff(txi, h));
+			s << renderDiff(ethereum()->diff(txi, h));
 			ui->debugCurrent->setEnabled(true);
 			ui->debugDumpState->setEnabled(true);
 			ui->debugDumpStatePre->setEnabled(true);
@@ -1173,7 +1133,7 @@ void Main::on_debugCurrent_triggered()
 		if (!item->data(Qt::UserRole + 1).isNull())
 		{
 			unsigned txi = item->data(Qt::UserRole + 1).toInt();
-			m_executiveState = client()->state(txi + 1, h);
+			m_executiveState = ethereum()->state(txi + 1, h);
 			m_currentExecution = unique_ptr<Executive>(new Executive(m_executiveState));
 			Transaction t = m_executiveState.pending()[txi];
 			m_executiveState = m_executiveState.fromPending(txi);
@@ -1199,7 +1159,7 @@ void Main::on_debugDumpState_triggered(int _add)
 			if (f.is_open())
 			{
 				unsigned txi = item->data(Qt::UserRole + 1).toInt();
-				f << client()->state(txi + _add, h) << endl;
+				f << ethereum()->state(txi + _add, h) << endl;
 			}
 		}
 	}
@@ -1265,10 +1225,10 @@ void Main::on_contracts_currentItemChanged()
 		stringstream s;
 		try
 		{
-			auto storage = client()->storageAt(address);
+			auto storage = ethereum()->storageAt(address);
 			for (auto const& i: storage)
 				s << "@" << showbase << hex << prettyU256(i.first).toStdString() << "&nbsp;&nbsp;&nbsp;&nbsp;" << showbase << hex << prettyU256(i.second).toStdString() << "<br/>";
-			s << "<h4>Body Code</h4>" << disassemble(client()->codeAt(address));
+			s << "<h4>Body Code</h4>" << disassemble(ethereum()->codeAt(address));
 			ui->contractInfo->appendHtml(QString::fromStdString(s.str()));
 		}
 		catch (dev::eth::InvalidTrie)
@@ -1281,7 +1241,7 @@ void Main::on_contracts_currentItemChanged()
 
 void Main::on_idealPeers_valueChanged()
 {
-	client()->setIdealPeerCount(ui->idealPeers->value());
+	m_webThree->setIdealPeerCount(ui->idealPeers->value());
 }
 
 void Main::on_ourAccounts_doubleClicked()
@@ -1427,7 +1387,7 @@ void Main::on_data_textChanged()
 				s = s.mid(1);
 		}
 		ui->code->setHtml(QString::fromStdString(dev::memDump(m_data, 8, true)));
-		if (client()->codeAt(fromString(ui->destination->currentText()), 0).size())
+		if (ethereum()->codeAt(fromString(ui->destination->currentText()), 0).size())
 		{
 			ui->gas->setMinimum((qint64)Client::txGas(m_data.size(), 1));
 			if (!ui->gas->isEnabled())
@@ -1450,9 +1410,9 @@ void Main::on_killBlockchain_triggered()
 	writeSettings();
 	ui->mine->setChecked(false);
 	ui->net->setChecked(false);
-	m_client.reset();
-	m_client.reset(new Client("AlethZero", Address(), string(), true));
-	m_ethereum->setClient(client());
+	web3()->stopNetwork();
+	ethereum()->killChain();
+	m_ethereum->setClient(ethereum());
 	readSettings(true);
 	installWatches();
 	refreshAll();
@@ -1495,7 +1455,7 @@ void Main::updateFee()
 
 	bool ok = false;
 	for (auto i: m_myKeys)
-		if (client()->balanceAt(i.address()) >= totalReq)
+		if (ethereum()->balanceAt(i.address()) >= totalReq)
 		{
 			ok = true;
 			break;
@@ -1514,15 +1474,24 @@ void Main::on_net_triggered()
 	if (ui->clientName->text().size())
 		n += "/" + ui->clientName->text().toStdString();
 	n +=  "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM);
-	client()->setClientVersion(n);
+	web3()->setClientVersion(n);
 	if (ui->net->isChecked())
 	{
-		client()->startNetwork(ui->port->value(), string(), 0, NodeMode::Full, ui->idealPeers->value(), ui->forceAddress->text().toStdString(), ui->upnp->isChecked(), m_privateChain.size() ? sha3(m_privateChain.toStdString()) : 0);
+		// TODO: alter network stuff?
+		//ui->port->value(), string(), 0, NodeMode::Full, ui->idealPeers->value(), ui->forceAddress->text().toStdString(), ui->upnp->isChecked(), m_privateChain.size() ? sha3(m_privateChain.toStdString()) : 0
+		web3()->setIdealPeerCount(ui->idealPeers->value());
+		web3()->setNetworkPreferences(netPrefs());
+		ethereum()->setNetworkId(m_privateChain.size() ? sha3(m_privateChain.toStdString()) : 0);
+		web3()->startNetwork();
+		ui->downloadView->setDownloadMan(ethereum()->downloadMan());
 		if (m_peers.size() && ui->usePast->isChecked())
-			client()->restorePeers(bytesConstRef((byte*)m_peers.data(), m_peers.size()));
+			web3()->restorePeers(bytesConstRef((byte*)m_peers.data(), m_peers.size()));
 	}
 	else
-		client()->stopNetwork();
+	{
+		ui->downloadView->setDownloadMan(nullptr);
+		web3()->stopNetwork();
+	}
 }
 
 void Main::on_connect_triggered()
@@ -1538,7 +1507,7 @@ void Main::on_connect_triggered()
 	{
 		string host = s.section(":", 0, 0).toStdString();
 		unsigned short port = s.section(":", 1).toInt();
-		client()->connect(host, port);
+		web3()->connect(host, port);
 	}
 }
 
@@ -1552,25 +1521,25 @@ void Main::on_mine_triggered()
 {
 	if (ui->mine->isChecked())
 	{
-		client()->setAddress(m_myKeys.last().address());
-		client()->startMining();
+		ethereum()->setAddress(m_myKeys.last().address());
+		ethereum()->startMining();
 	}
 	else
-		client()->stopMining();
+		ethereum()->stopMining();
 }
 
 void Main::on_send_clicked()
 {
 	u256 totalReq = value() + fee();
 	for (auto i: m_myKeys)
-		if (client()->balanceAt(i.address(), 0) >= totalReq)
+		if (ethereum()->balanceAt(i.address(), 0) >= totalReq)
 		{
 			debugFinished();
 			Secret s = i.secret();
 			if (isCreation())
-				client()->transact(s, value(), m_data, ui->gas->value(), gasPrice());
+				ethereum()->transact(s, value(), m_data, ui->gas->value(), gasPrice());
 			else
-				client()->transact(s, value(), fromString(ui->destination->currentText()), m_data, ui->gas->value(), gasPrice());
+				ethereum()->transact(s, value(), fromString(ui->destination->currentText()), m_data, ui->gas->value(), gasPrice());
 			return;
 		}
 	statusBar()->showMessage("Couldn't make transaction: no single account contains at least the required amount.");
@@ -1583,10 +1552,10 @@ void Main::on_debug_clicked()
 	{
 		u256 totalReq = value() + fee();
 		for (auto i: m_myKeys)
-			if (client()->balanceAt(i.address()) >= totalReq)
+			if (ethereum()->balanceAt(i.address()) >= totalReq)
 			{
 				Secret s = i.secret();
-				m_executiveState = client()->postState();
+				m_executiveState = ethereum()->postState();
 				m_currentExecution = unique_ptr<Executive>(new Executive(m_executiveState));
 				Transaction t;
 				t.nonce = m_executiveState.transactionsFrom(dev::toAddress(s));
@@ -1937,4 +1906,7 @@ void Main::updateDebugger()
 #include\
 "moc_MiningView.cpp"
 
+#include\
+"moc_DownloadView.cpp"
+
 #endif
diff --git a/alethzero/MainWin.h b/alethzero/MainWin.h
index a3bfa718d..ce1a9b670 100644
--- a/alethzero/MainWin.h
+++ b/alethzero/MainWin.h
@@ -31,6 +31,7 @@
 #include <libethcore/CommonEth.h>
 #include <libethereum/State.h>
 #include <libqethereum/QEthereum.h>
+#include <libwebthree/WebThree.h>
 
 namespace Ui {
 class Main;
@@ -69,7 +70,9 @@ public:
 	explicit Main(QWidget *parent = 0);
 	~Main();
 
-	dev::eth::Client* client() const { return m_client.get(); }
+	dev::WebThreeDirect* web3() const { return m_webThree.get(); }
+	dev::eth::Client* ethereum() const { return m_webThree->ethereum(); }
+	dev::shh::WhisperHost* whisper() const { return m_webThree->whisper(); }
 
 	QList<dev::KeyPair> const& owned() const { return m_myKeys; }
 	
@@ -146,6 +149,8 @@ signals:
 	void poll();
 
 private:
+	dev::p2p::NetworkPreferences netPrefs() const;
+
 	QString pretty(dev::Address _a) const;
 	QString prettyU256(dev::u256 _n) const;
 
@@ -200,7 +205,7 @@ private:
 
 	std::unique_ptr<Ui::Main> ui;
 
-	std::unique_ptr<dev::eth::Client> m_client;
+	std::unique_ptr<dev::WebThreeDirect> m_webThree;
 
 	std::map<unsigned, std::function<void()>> m_handlers;
 	unsigned m_nameRegFilter = (unsigned)-1;
diff --git a/eth/CMakeLists.txt b/eth/CMakeLists.txt
index 93946aa8f..eee1d258b 100644
--- a/eth/CMakeLists.txt
+++ b/eth/CMakeLists.txt
@@ -4,13 +4,13 @@ aux_source_directory(. SRC_LIST)
 
 include_directories(..)
 link_directories(../libethcore)
-link_directories(../libethereum)
+link_directories(../libwebthree)
 
 set(EXECUTABLE eth)
 
 add_executable(${EXECUTABLE} ${SRC_LIST})
 
-target_link_libraries(${EXECUTABLE} ethereum)
+target_link_libraries(${EXECUTABLE} webthree)
 target_link_libraries(${EXECUTABLE} secp256k1)
 target_link_libraries(${EXECUTABLE} gmp)
 if(MINIUPNPC_LS)
diff --git a/eth/EthStubServer.cpp b/eth/EthStubServer.cpp
index 86bb1ba58..ad6a87781 100644
--- a/eth/EthStubServer.cpp
+++ b/eth/EthStubServer.cpp
@@ -25,14 +25,15 @@
 #include <libevmface/Instruction.h>
 #include <liblll/Compiler.h>
 #include <libethereum/Client.h>
+#include <libwebthree/WebThree.h>
 #include "CommonJS.h"
 using namespace std;
 using namespace dev;
 using namespace dev::eth;
 
-EthStubServer::EthStubServer(jsonrpc::AbstractServerConnector* _conn, Client& _client):
+EthStubServer::EthStubServer(jsonrpc::AbstractServerConnector* _conn, WebThreeDirect& _web3):
 	AbstractEthStubServer(_conn),
-	m_client(_client)
+	m_web3(_web3)
 {
 }
 
@@ -59,20 +60,25 @@ Json::Value EthStubServer::procedures()
 	return ret;
 }
 
+dev::eth::Client& EthStubServer::ethereum() const
+{
+	return *m_web3.ethereum();
+}
+
 std::string EthStubServer::coinbase()
 {
-	return toJS(m_client.address());
+	return toJS(ethereum().address());
 }
 
 std::string EthStubServer::balanceAt(std::string const& _a)
 {
-	return toJS(m_client.balanceAt(jsToAddress(_a), 0));
+	return toJS(ethereum().balanceAt(jsToAddress(_a), 0));
 }
 
 Json::Value EthStubServer::check(Json::Value const& _as)
 {
 	// TODO
-//	if (m_client.changed())
+//	if (ethereum().changed())
 		return _as;
 /*	else
 	{
@@ -84,7 +90,7 @@ Json::Value EthStubServer::check(Json::Value const& _as)
 
 std::string EthStubServer::create(const std::string& _bCode, const std::string& _sec, const std::string& _xEndowment, const std::string& _xGas, const std::string& _xGasPrice)
 {
-	Address ret = m_client.transact(jsToSecret(_sec), jsToU256(_xEndowment), jsToBytes(_bCode), jsToU256(_xGas), jsToU256(_xGasPrice));
+	Address ret = ethereum().transact(jsToSecret(_sec), jsToU256(_xEndowment), jsToBytes(_bCode), jsToU256(_xGas), jsToU256(_xGasPrice));
 	return toJS(ret);
 }
 
@@ -100,17 +106,17 @@ std::string EthStubServer::gasPrice()
 
 bool EthStubServer::isContractAt(const std::string& _a)
 {
-	return m_client.codeAt(jsToAddress(_a), 0).size();
+	return ethereum().codeAt(jsToAddress(_a), 0).size();
 }
 
 bool EthStubServer::isListening()
 {
-	return m_client.haveNetwork();
+	return m_web3.haveNetwork();
 }
 
 bool EthStubServer::isMining()
 {
-	return m_client.isMining();
+	return ethereum().isMining();
 }
 
 std::string EthStubServer::key()
@@ -130,23 +136,28 @@ Json::Value EthStubServer::keys()
 
 int EthStubServer::peerCount()
 {
-	return m_client.peerCount();
+	return m_web3.peerCount();
 }
 
 std::string EthStubServer::storageAt(const std::string& _a, const std::string& x)
 {
-	return toJS(m_client.stateAt(jsToAddress(_a), jsToU256(x), 0));
+	return toJS(ethereum().stateAt(jsToAddress(_a), jsToU256(x), 0));
+}
+
+std::string EthStubServer::stateAt(const std::string& _a, const std::string& x, const std::string& s)
+{
+	return toJS(ethereum().stateAt(jsToAddress(_a), jsToU256(x), std::atol(s.c_str())));
 }
 
 Json::Value EthStubServer::transact(const std::string& _aDest, const std::string& _bData, const std::string& _sec, const std::string& _xGas, const std::string& _xGasPrice, const std::string& _xValue)
 {
-	m_client.transact(jsToSecret(_sec), jsToU256(_xValue), jsToAddress(_aDest), jsToBytes(_bData), jsToU256(_xGas), jsToU256(_xGasPrice));
+	ethereum().transact(jsToSecret(_sec), jsToU256(_xValue), jsToAddress(_aDest), jsToBytes(_bData), jsToU256(_xGas), jsToU256(_xGasPrice));
 	return Json::Value();
 }
 
 std::string EthStubServer::txCountAt(const std::string& _a)
 {
-	return toJS(m_client.countAt(jsToAddress(_a), 0));
+	return toJS(ethereum().countAt(jsToAddress(_a), 0));
 }
 
 std::string EthStubServer::secretToAddress(const std::string& _a)
@@ -167,7 +178,7 @@ Json::Value EthStubServer::block(const std::string& _hash)
 Json::Value EthStubServer::blockJson(const std::string& _hash)
 {
 	Json::Value res;
-	auto const& bc = m_client.blockChain();
+	auto const& bc = ethereum().blockChain();
 	
 	auto b = _hash.length() ? bc.block(h256(_hash)) : bc.block();
 	
diff --git a/eth/EthStubServer.h b/eth/EthStubServer.h
index 28af916a2..469abed07 100644
--- a/eth/EthStubServer.h
+++ b/eth/EthStubServer.h
@@ -29,12 +29,12 @@
 #include "abstractethstubserver.h"
 #pragma GCC diagnostic pop
 
-namespace dev { namespace eth { class Client; } class KeyPair; }
+namespace dev { class WebThreeDirect; namespace eth { class Client; } class KeyPair; }
 
 class EthStubServer: public AbstractEthStubServer
 {
 public:
-	EthStubServer(jsonrpc::AbstractServerConnector* _conn, dev::eth::Client& _client);
+	EthStubServer(jsonrpc::AbstractServerConnector* _conn, dev::WebThreeDirect& _web3);
 
 	virtual Json::Value procedures();
 	virtual std::string balanceAt(std::string const& _a);
@@ -49,6 +49,7 @@ public:
 	virtual Json::Value keys();
 	virtual int peerCount();
 	virtual std::string storageAt(const std::string& a, const std::string& x);
+	virtual std::string stateAt(const std::string& a, const std::string& x, const std::string& s);
 	virtual Json::Value transact(const std::string& aDest, const std::string& bData, const std::string& sec, const std::string& xGas, const std::string& xGasPrice, const std::string& xValue);
 	virtual std::string txCountAt(const std::string& a);
 	virtual std::string secretToAddress(const std::string& a);
@@ -57,7 +58,8 @@ public:
 	virtual Json::Value block(const std::string&);
 	void setKeys(std::vector<dev::KeyPair> _keys) { m_keys = _keys; }
 private:
-	dev::eth::Client& m_client;
+	dev::eth::Client& ethereum() const;
+	dev::WebThreeDirect& m_web3;
 	std::vector<dev::KeyPair> m_keys;
 	Json::Value jsontypeToValue(int);
 	Json::Value blockJson(const std::string&);
diff --git a/eth/abstractethstubserver.h b/eth/abstractethstubserver.h
index 940e4c809..7f110513d 100644
--- a/eth/abstractethstubserver.h
+++ b/eth/abstractethstubserver.h
@@ -30,6 +30,7 @@ class AbstractEthStubServer : public jsonrpc::AbstractServer<AbstractEthStubServ
             this->bindAndAddMethod(new jsonrpc::Procedure("procedures", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_ARRAY,  NULL), &AbstractEthStubServer::proceduresI);
             this->bindAndAddMethod(new jsonrpc::Procedure("secretToAddress", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_STRING, "a",jsonrpc::JSON_STRING, NULL), &AbstractEthStubServer::secretToAddressI);
             this->bindAndAddMethod(new jsonrpc::Procedure("storageAt", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_STRING, "a",jsonrpc::JSON_STRING,"x",jsonrpc::JSON_STRING, NULL), &AbstractEthStubServer::storageAtI);
+            this->bindAndAddMethod(new jsonrpc::Procedure("stateAt", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_STRING, "a",jsonrpc::JSON_STRING,"x",jsonrpc::JSON_STRING,"s",jsonrpc::JSON_STRING, NULL), &AbstractEthStubServer::stateAtI);
             this->bindAndAddMethod(new jsonrpc::Procedure("transact", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_OBJECT, "aDest",jsonrpc::JSON_STRING,"bData",jsonrpc::JSON_STRING,"sec",jsonrpc::JSON_STRING,"xGas",jsonrpc::JSON_STRING,"xGasPrice",jsonrpc::JSON_STRING,"xValue",jsonrpc::JSON_STRING, NULL), &AbstractEthStubServer::transactI);
             this->bindAndAddMethod(new jsonrpc::Procedure("txCountAt", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_STRING, "a",jsonrpc::JSON_STRING, NULL), &AbstractEthStubServer::txCountAtI);
 
@@ -120,6 +121,11 @@ class AbstractEthStubServer : public jsonrpc::AbstractServer<AbstractEthStubServ
             response = this->storageAt(request["a"].asString(), request["x"].asString());
         }
 
+        inline virtual void stateAtI(const Json::Value& request, Json::Value& response)
+        {
+            response = this->stateAt(request["a"].asString(), request["x"].asString(), request["s"].asString());
+        }
+
         inline virtual void transactI(const Json::Value& request, Json::Value& response) 
         {
             response = this->transact(request["aDest"].asString(), request["bData"].asString(), request["sec"].asString(), request["xGas"].asString(), request["xGasPrice"].asString(), request["xValue"].asString());
@@ -148,6 +154,7 @@ class AbstractEthStubServer : public jsonrpc::AbstractServer<AbstractEthStubServ
         virtual Json::Value procedures() = 0;
         virtual std::string secretToAddress(const std::string& a) = 0;
         virtual std::string storageAt(const std::string& a, const std::string& x) = 0;
+        virtual std::string stateAt(const std::string& a, const std::string& x, const std::string& b) = 0;
         virtual Json::Value transact(const std::string& aDest, const std::string& bData, const std::string& sec, const std::string& xGas, const std::string& xGasPrice, const std::string& xValue) = 0;
         virtual std::string txCountAt(const std::string& a) = 0;
 
diff --git a/eth/eth.js b/eth/eth.js
index 733097723..791386a0b 100644
--- a/eth/eth.js
+++ b/eth/eth.js
@@ -25,6 +25,7 @@ var spec = [
             { "method": "peerCount", "params": null, "order": [], "returns" : 0 },
             { "method": "balanceAt", "params": { "a": "" }, "order": ["a"], "returns" : "" },
             { "method": "storageAt", "params": { "a": "", "x": "" }, "order": ["a", "x"], "returns" : "" },
+            { "method": "stateAt", "params": { "a": "", "x": "", "s": "" }, "order": ["a", "x", "s"], "returns" : "" },
             { "method": "txCountAt", "params": { "a": "" },"order": ["a"], "returns" : "" },
             { "method": "isContractAt", "params": { "a": "" }, "order": ["a"], "returns" : false },
             { "method": "create", "params": { "sec": "", "xEndowment": "", "bCode": "", "xGas": "", "xGasPrice": "" }, "order": ["sec", "xEndowment", "bCode", "xGas", "xGasPrice"] , "returns": "" },
@@ -70,9 +71,14 @@ window.eth = (function ethScope() {
 		var m = s.method;
 		var am = "get" + m.slice(0, 1).toUpperCase() + m.slice(1);
 		var getParams = function(a) {
-			var p = s.params ? {} : null
+			var p = s.params ? {} : null;
+			if (m == "stateAt")
+				if (a.length == 2)
+					a[2] = "0";
+				else
+					a[2] = String(a[2]);
 			for (j in s.order)
-				p[s.order[j]] = (s.order[j][0] === "b") ? a[j].unbin() : a[j]
+				p[s.order[j]] = (s.order[j][0] === "b") ? a[j].unbin() : a[j];
 			return p
 		};
 		if (m == "create" || m == "transact")
@@ -101,7 +107,7 @@ window.eth = (function ethScope() {
 		for (var c in changed)
 			m_watching[changed[c]]()
 		var that = this;
-		setTimeout(function() { that.check() }, 5000)
+		setTimeout(function() { that.check() }, 12000)
 	}
 
 	ret.watch = function(a, fx, f) {
diff --git a/eth/main.cpp b/eth/main.cpp
index bd71f6677..a9ea43f14 100644
--- a/eth/main.cpp
+++ b/eth/main.cpp
@@ -33,6 +33,7 @@
 #include <libevmface/Instruction.h>
 #include <libevm/VM.h>
 #include <libethereum/All.h>
+#include <libwebthree/WebThree.h>
 #if ETH_READLINE
 #include <readline/readline.h>
 #include <readline/history.h>
@@ -43,6 +44,7 @@
 #include "BuildInfo.h"
 using namespace std;
 using namespace dev;
+using namespace dev::p2p;
 using namespace dev::eth;
 using namespace boost::algorithm;
 using dev::eth::Instruction;
@@ -97,6 +99,7 @@ void help()
         << "Usage eth [OPTIONS] <remote-host>" << endl
         << "Options:" << endl
         << "    -a,--address <addr>  Set the coinbase (mining payout) address to addr (default: auto)." << endl
+		<< "    -b,--bootstrap  Connect to the default Ethereum peerserver." << endl
         << "    -c,--client-name <name>  Add a name to your client's version string (default: blank)." << endl
         << "    -d,--db-path <path>  Load database from path (default:  ~/.ethereum " << endl
         << "                         <APPDATA>/Etherum or Library/Application Support/Ethereum)." << endl
@@ -110,7 +113,8 @@ void help()
         << "    -l,--listen <port>  Listen on the given port for incoming connected (default: 30303)." << endl
 		<< "    -m,--mining <on/off/number>  Enable mining, optionally for a specified number of blocks (Default: off)" << endl
 		<< "    -n,--upnp <on/off>  Use upnp for NAT (default: on)." << endl
-        << "    -o,--mode <full/peer>  Start a full node or a peer node (Default: full)." << endl
+		<< "    -L,--local-networking Use peers whose addresses are local." << endl
+		<< "    -o,--mode <full/peer>  Start a full node or a peer node (Default: full)." << endl
         << "    -p,--port <port>  Connect to remote port (default: 30303)." << endl
         << "    -r,--remote <host>  Connect to remote host (default: none)." << endl
         << "    -s,--secret <secretkeyhex>  Set the secret key for use with send command (default: auto)." << endl
@@ -131,17 +135,8 @@ string credits(bool _interactive = false)
 
 	if (_interactive)
 	{
-		string vs = toString(dev::Version);
-		vs = vs.substr(vs.find_first_of('.') + 1)[0];
-		int pocnumber = stoi(vs);
-		string m_servers;
-		if (pocnumber == 4)
-			m_servers = "54.72.31.55";
-		else
-			m_servers = "54.72.69.180";
-
 		cout << "Type 'netstart 30303' to start networking" << endl;
-		cout << "Type 'connect " << m_servers << " 30303' to connect" << endl;
+		cout << "Type 'connect " << Host::pocHost() << " 30303' to connect" << endl;
 		cout << "Type 'exit' to quit" << endl << endl;
 	}
 	return cout.str();
@@ -182,10 +177,12 @@ int main(int argc, char** argv)
 	unsigned peers = 5;
 	bool interactive = false;
 #if ETH_JSONRPC
-	int jsonrpc = 8080;
+	int jsonrpc = -1;
 #endif
 	string publicIP;
+	bool bootstrap = false;
 	bool upnp = true;
+	bool useLocal = false;
 	bool forceMining = false;
 	string clientName;
 
@@ -231,10 +228,12 @@ int main(int argc, char** argv)
 				upnp = false;
 			else
 			{
-				cerr << "Invalid UPnP option: " << m << endl;
+				cerr << "Invalid -n/--upnp option: " << m << endl;
 				return -1;
 			}
 		}
+		else if (arg == "-L" || arg == "--local-networking")
+			useLocal = true;
 		else if ((arg == "-c" || arg == "--client-name") && i + 1 < argc)
 			clientName = argv[++i];
 		else if ((arg == "-a" || arg == "--address" || arg == "--coinbase-address") && i + 1 < argc)
@@ -254,17 +253,19 @@ int main(int argc, char** argv)
 				mining = i;
 			else
 			{
-				cerr << "Unknown mining option: " << m << endl;
+				cerr << "Unknown -m/--mining option: " << m << endl;
 				return -1;
 			}
 		}
+		else if (arg == "-b" || arg == "--bootstrap")
+			bootstrap = true;
 		else if (arg == "-f" || arg == "--force-mining")
 			forceMining = true;
 		else if (arg == "-i" || arg == "--interactive")
 			interactive = true;
 #if ETH_JSONRPC
 		else if ((arg == "-j" || arg == "--json-rpc"))
-			jsonrpc = jsonrpc ? jsonrpc : 8080;
+			jsonrpc = jsonrpc == -1 ? 8080 : jsonrpc;
 		else if (arg == "--json-rpc-port" && i + 1 < argc)
 			jsonrpc = atoi(argv[++i]);
 #endif
@@ -296,22 +297,32 @@ int main(int argc, char** argv)
 	if (!clientName.empty())
 		clientName += "/";
 
-	Client c("Ethereum(++)/" + clientName + "v" + dev::Version + "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM), coinbase, dbPath);
-
-	c.setForceMining(true);
-
 	cout << credits();
 
-	c.setForceMining(forceMining);
+	NetworkPreferences netPrefs(listenPort, publicIP, upnp, useLocal);
+	dev::WebThreeDirect web3("Ethereum(++)/" + clientName + "v" + dev::Version + "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM), dbPath, false, mode == NodeMode::Full ? set<string>{"eth", "shh"} : set<string>{}, netPrefs);
+	web3.setIdealPeerCount(peers);
+	eth::Client* c = mode == NodeMode::Full ? web3.ethereum() : nullptr;
+
+	if (c)
+	{
+		c->setForceMining(forceMining);
+		c->setAddress(coinbase);
+	}
 
 	cout << "Address: " << endl << toHex(us.address().asArray()) << endl;
-	c.startNetwork(listenPort, remoteHost, remotePort, mode, peers, publicIP, upnp);
+	web3.startNetwork();
+
+	if (bootstrap)
+		web3.connect(Host::pocHost());
+	if (remoteHost.size())
+		web3.connect(remoteHost, remotePort);
 
 #if ETH_JSONRPC
 	auto_ptr<EthStubServer> jsonrpcServer;
 	if (jsonrpc > -1)
 	{
-		jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), c));
+		jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), web3));
 		jsonrpcServer->setKeys({us});
 		jsonrpcServer->StartListening();
 	}
@@ -349,34 +360,34 @@ int main(int argc, char** argv)
 			iss >> cmd;
 			if (cmd == "netstart")
 			{
-				unsigned port;
-				iss >> port;
-				c.startNetwork((short)port);
+				iss >> netPrefs.listenPort;
+				web3.setNetworkPreferences(netPrefs);
+				web3.startNetwork();
 			}
 			else if (cmd == "connect")
 			{
 				string addr;
 				unsigned port;
 				iss >> addr >> port;
-				c.connect(addr, (short)port);
+				web3.connect(addr, (short)port);
 			}
 			else if (cmd == "netstop")
 			{
-				c.stopNetwork();
+				web3.stopNetwork();
 			}
-			else if (cmd == "minestart")
+			else if (c && cmd == "minestart")
 			{
-				c.startMining();
+				c->startMining();
 			}
-			else if (cmd == "minestop")
+			else if (c && cmd == "minestop")
 			{
-				c.stopMining();
+				c->stopMining();
 			}
-			else if (cmd == "mineforce")
+			else if (c && cmd == "mineforce")
 			{
 				string enable;
 				iss >> enable;
-				c.setForceMining(isTrue(enable));
+				c->setForceMining(isTrue(enable));
 			}
 			else if (cmd == "verbosity")
 			{
@@ -395,7 +406,7 @@ int main(int argc, char** argv)
 			{
 				if (jsonrpc < 0)
 					jsonrpc = 8080;
-				jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), c));
+				jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), web3));
 				jsonrpcServer->setKeys({us});
 				jsonrpcServer->StartListening();
 			}
@@ -416,24 +427,24 @@ int main(int argc, char** argv)
 			{
 				cout << "Secret Key: " << toHex(us.secret().asArray()) << endl;
 			}
-			else if (cmd == "block")
+			else if (c && cmd == "block")
 			{
-				cout << "Current block: " << c.blockChain().details().number << endl;
+				cout << "Current block: " <<c->blockChain().details().number << endl;
 			}
 			else if (cmd == "peers")
 			{
-				for (auto it: c.peers())
+				for (auto it: web3.peers())
 					cout << it.host << ":" << it.port << ", " << it.clientVersion << ", "
 						<< std::chrono::duration_cast<std::chrono::milliseconds>(it.lastPing).count() << "ms"
 						<< endl;
 			}
-			else if (cmd == "balance")
+			else if (c && cmd == "balance")
 			{
-				cout << "Current balance: " << formatBalance(c.balanceAt(us.address())) << " = " << c.balanceAt(us.address()) << " wei" << endl;
+				cout << "Current balance: " << formatBalance( c->balanceAt(us.address())) << " = " <<c->balanceAt(us.address()) << " wei" << endl;
 			}
-			else if (cmd == "transact")
+			else if (c && cmd == "transact")
 			{
-				auto const& bc = c.blockChain();
+				auto const& bc =c->blockChain();
 				auto h = bc.currentHash();
 				auto blockData = bc.block(h);
 				BlockInfo info(blockData);
@@ -478,35 +489,35 @@ int main(int argc, char** argv)
 					{
 						Secret secret = h256(fromHex(sechex));
 						Address dest = h160(fromHex(hexAddr));
-						c.transact(secret, amount, dest, data, gas, gasPrice);
+						c->transact(secret, amount, dest, data, gas, gasPrice);
 					}
 				}
 				else
 					cwarn << "Require parameters: transact ADDRESS AMOUNT GASPRICE GAS SECRET DATA";
 			}
-			else if (cmd == "listContracts")
+			else if (c && cmd == "listContracts")
 			{
-				auto acs = c.addresses();
+				auto acs =c->addresses();
 				string ss;
 				for (auto const& i: acs)
-					if (c.codeAt(i, 0).size())
+					if ( c->codeAt(i, 0).size())
 					{
-						ss = toString(i) + " : " + toString(c.balanceAt(i)) + " [" + toString((unsigned)c.countAt(i)) + "]";
+						ss = toString(i) + " : " + toString( c->balanceAt(i)) + " [" + toString((unsigned) c->countAt(i)) + "]";
 						cout << ss << endl;
 					}
 			}
-			else if (cmd == "listAccounts")
+			else if (c && cmd == "listAccounts")
 			{
-				auto acs = c.addresses();
+				auto acs =c->addresses();
 				string ss;
 				for (auto const& i: acs)
-					if (c.codeAt(i, 0).empty())
+					if ( c->codeAt(i, 0).empty())
 					{
-						ss = toString(i) + " : " + toString(c.balanceAt(i)) + " [" + toString((unsigned)c.countAt(i)) + "]";
+						ss = toString(i) + " : " + toString( c->balanceAt(i)) + " [" + toString((unsigned) c->countAt(i)) + "]";
 						cout << ss << endl;
 					}
 			}
-			else if (cmd == "send")
+			else if (c && cmd == "send")
 			{
 				if (iss.peek() != -1)
 				{
@@ -522,21 +533,21 @@ int main(int argc, char** argv)
 					}
 					else 
 					{
-						auto const& bc = c.blockChain();
+						auto const& bc =c->blockChain();
 						auto h = bc.currentHash();
 						auto blockData = bc.block(h);
 						BlockInfo info(blockData);
 						u256 minGas = (u256)Client::txGas(0, 0);
 						Address dest = h160(fromHex(hexAddr));
-						c.transact(us.secret(), amount, dest, bytes(), minGas, info.minGasPrice);
+						c->transact(us.secret(), amount, dest, bytes(), minGas, info.minGasPrice);
 					}
 				} 
 				else
 					cwarn << "Require parameters: send ADDRESS AMOUNT";
 			}
-			else if (cmd == "contract")
+			else if (c && cmd == "contract")
 			{
-				auto const& bc = c.blockChain();
+				auto const& bc =c->blockChain();
 				auto h = bc.currentHash();
 				auto blockData = bc.block(h);
 				BlockInfo info(blockData);
@@ -573,12 +584,12 @@ int main(int argc, char** argv)
 					else if (gas < minGas)
 						cwarn << "Minimum gas amount is" << minGas;
 					else
-						c.transact(us.secret(), endowment, init, gas, gasPrice);
+						c->transact(us.secret(), endowment, init, gas, gasPrice);
 				} 
 				else
 					cwarn << "Require parameters: contract ENDOWMENT GASPRICE GAS CODEHEX";
 			}
-			else if (cmd == "dumptrace")
+			else if (c && cmd == "dumptrace")
 			{
 				unsigned block;
 				unsigned index;
@@ -588,7 +599,7 @@ int main(int argc, char** argv)
 				ofstream f;
 				f.open(filename);
 
-				dev::eth::State state = c.state(index + 1, c.blockChain().numberHash(block));
+				dev::eth::State state =c->state(index + 1,c->blockChain().numberHash(block));
 				if (index < state.pending().size())
 				{
 					Executive e(state);
@@ -633,7 +644,7 @@ int main(int argc, char** argv)
 					e.finalize(oof);
 				}
 			}
-			else if (cmd == "inspect")
+			else if (c && cmd == "inspect")
 			{
 				string rechex;
 				iss >> rechex;
@@ -647,10 +658,10 @@ int main(int argc, char** argv)
 
 					try
 					{
-						auto storage = c.storageAt(h, 0);
+						auto storage =c->storageAt(h, 0);
 						for (auto const& i: storage)
 							s << "@" << showbase << hex << i.first << "    " << showbase << hex << i.second << endl;
-						s << endl << disassemble(c.codeAt(h, 0)) << endl;
+						s << endl << disassemble( c->codeAt(h, 0)) << endl;
 
 						string outFile = getDataDir() + "/" + rechex + ".evm";
 						ofstream ofs;
@@ -735,19 +746,21 @@ int main(int argc, char** argv)
 			jsonrpcServer->StopListening();
 #endif
 	}
-	else
+	else if (c)
 	{
-		unsigned n = c.blockChain().details().number;
+		unsigned n =c->blockChain().details().number;
 		if (mining)
-			c.startMining();
+			c->startMining();
 		while (true)
 		{
-			if (c.blockChain().details().number - n == mining)
-				c.stopMining();
+			if ( c->isMining() &&c->blockChain().details().number - n == mining)
+				c->stopMining();
 			this_thread::sleep_for(chrono::milliseconds(100));
 		}
 	}
-
+	else
+		while (true)
+			this_thread::sleep_for(chrono::milliseconds(1000));
 
 	return 0;
 }
diff --git a/exp/main.cpp b/exp/main.cpp
index c49b13e44..1f29ab207 100644
--- a/exp/main.cpp
+++ b/exp/main.cpp
@@ -19,290 +19,59 @@
  * @date 2014
  * Ethereum client.
  */
-#if 0
-#define BOOST_RESULT_OF_USE_DECLTYPE
-#define BOOST_SPIRIT_USE_PHOENIX_V3
-#include <boost/spirit/include/qi.hpp>
-#include <boost/spirit/include/phoenix.hpp>
-#include <boost/spirit/include/support_utree.hpp>
-#endif
+#include <functional>
 #include <libdevcore/Log.h>
 #include <libdevcore/Common.h>
 #include <libdevcore/CommonData.h>
 #include <libdevcore/RLP.h>
 #include <libp2p/All.h>
+#include <libdevcore/RangeMask.h>
+#include <libethereum/DownloadMan.h>
 #include <libwhisper/WhisperPeer.h>
-#if 0
-#include <libevm/VM.h>
-#include "BuildInfo.h"
-#endif
 using namespace std;
 using namespace dev;
 using namespace dev::eth;
 using namespace dev::p2p;
 using namespace dev::shh;
-#if 0
-#if 0
-namespace qi = boost::spirit::qi;
-namespace px = boost::phoenix;
-namespace sp = boost::spirit;
 
-
-class ASTSymbol: public string
-{
-public:
-	ASTSymbol() {}
-};
-
-enum class ASTType
-{
-	Symbol,
-	IntegerLiteral,
-	StringLiteral,
-	Call,
-	Return,
-	Operator,
-	Compound
-};
-
-class ASTNode: public vector<ASTNode>
-{
-public:
-	ASTNode() {}
-	ASTNode(ASTSymbol const& _s): m_type(ASTType::Symbol), m_s(_s) {}
-	ASTNode(string const& _s): m_type(ASTType::StringLiteral), m_s(_s) {}
-	ASTNode(bigint const& _i): m_type(ASTType::IntegerLiteral), m_i(_i) {}
-	ASTNode(ASTType _t): m_type(_t) {}
-
-	ASTNode& operator=(ASTSymbol const& _s) { m_type = ASTType::Symbol; m_s = _s; return *this; }
-	ASTNode& operator=(string const& _s) { m_type = ASTType::StringLiteral; m_s = _s; return *this; }
-	ASTNode& operator=(bigint const& _i) { m_type = ASTType::IntegerLiteral; m_i = _i; return *this; }
-	ASTNode& operator=(ASTType const& _s) { m_type = _s; return *this; }
-
-	void debugOut(ostream& _out) const;
-
-private:
-	ASTType m_type;
-	string m_s;
-	bigint m_i;
-};
-
-void parseTree(string const& _s, ASTNode& o_out)
-{
-	using qi::standard::space;
-	using qi::standard::space_type;
-	typedef string::const_iterator it;
-
-/*	static const u256 ether = u256(1000000000) * 1000000000;
-	static const u256 finney = u256(1000000000) * 1000000;
-	static const u256 szabo = u256(1000000000) * 1000;*/
-
-	qi::rule<it, space_type, ASTNode()> element;
-	qi::rule<it, space_type, ASTNode()> call;
-	qi::rule<it, string()> str = '"' > qi::lexeme[+(~qi::char_(std::string("\"") + '\0'))] > '"';
-	qi::rule<it, ASTSymbol()> symbol = qi::lexeme[+(~qi::char_(std::string(" $@[]{}:();\"\x01-\x1f\x7f") + '\0'))];
-/*	qi::rule<it, string()> strsh = '\'' > qi::lexeme[+(~qi::char_(std::string(" ;$@()[]{}:\n\t") + '\0'))];
-	qi::rule<it, string()> intstr = qi::lexeme[ qi::no_case["0x"][qi::_val = "0x"] >> *qi::char_("0-9a-fA-F")[qi::_val += qi::_1]] | qi::lexeme[+qi::char_("0-9")[qi::_val += qi::_1]];
-	qi::rule<it, bigint()> integer = intstr;
-	qi::rule<it, bigint()> multiplier = qi::lit("wei")[qi::_val = 1] | qi::lit("szabo")[qi::_val = szabo] | qi::lit("finney")[qi::_val = finney] | qi::lit("ether")[qi::_val = ether];
-	qi::rule<it, space_type, bigint()> quantity = integer[qi::_val = qi::_1] >> -multiplier[qi::_val *= qi::_1];
-	qi::rule<it, space_type, sp::utree()> atom = quantity[qi::_val = px::construct<sp::any_ptr>(px::new_<bigint>(qi::_1))] | (str | strsh)[qi::_val = qi::_1] | symbol[qi::_val = qi::_1];
-	qi::rule<it, space_type, sp::utree::list_type()> seq = '{' > *element > '}';
-	qi::rule<it, space_type, sp::utree::list_type()> mload = '@' > element;
-	qi::rule<it, space_type, sp::utree::list_type()> sload = qi::lit("@@") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> mstore = '[' > element > ']' > -qi::lit(":") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> sstore = qi::lit("[[") > element > qi::lit("]]") > -qi::lit(":") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> calldataload = qi::lit("$") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> list = '(' > *element > ')';
-
-	qi::rule<it, space_type, sp::utree()> extra = sload[tagNode<2>()] | mload[tagNode<1>()] | sstore[tagNode<4>()] | mstore[tagNode<3>()] | seq[tagNode<5>()] | calldataload[tagNode<6>()];*/
-	qi::rule<it, space_type, ASTNode()> value = call[qi::_val = ASTType::Call] | str[qi::_val = qi::_1] | symbol[qi::_val = qi::_1];
-	qi::rule<it, space_type, ASTNode()> compound = '{' > *element > '}';
-	call = '(' > *value > ')'; //symbol > '(' > !(value > *(',' > value)) > ')';
-	element = compound[qi::_val = ASTType::Compound] | value[qi::_val = qi::_1];
-
-	auto ret = _s.cbegin();
-	qi::phrase_parse(ret, _s.cend(), element, space, qi::skip_flag::dont_postskip, o_out);
-	for (auto i = ret; i != _s.cend(); ++i)
-		if (!isspace(*i))
-			throw std::exception();
-}
-
-void ASTNode::debugOut(ostream& _out) const
-{
-	switch (m_type)
-	{
-	case ASTType::StringLiteral:
-		_out << "\"" << m_s << "\"";
-		break;
-	case ASTType::Symbol:
-		_out << m_s;
-		break;
-	case ASTType::Compound:
-	{
-		unsigned n = 0;
-		_out << "{";
-		for (auto const& i: *this)
-		{
-			i.debugOut(_out);
-			_out << ";";
-			++n;
-		}
-		_out << "}";
-		break;
-	}
-	case ASTType::Call:
-	{
-		unsigned n = 0;
-		for (auto const& i: *this)
-		{
-			i.debugOut(_out);
-			if (n == 0)
-				_out << "(";
-			else if (n < size() - 1)
-				_out << ",";
-			if (n == size() - 1)
-				_out << ")";
-			++n;
-		}
-		break;
-	}
-	default:
-		_out << "nil";
-	}
-}
-
-int main(int, char**)
+int main()
 {
-	ASTNode out;
-	parseTree("{x}", out);
-	out.debugOut(cout);
-	cout << endl;
+	DownloadMan man;
+	DownloadSub s0(man);
+	DownloadSub s1(man);
+	DownloadSub s2(man);
+	man.resetToChain(h256s({u256(0), u256(1), u256(2), u256(3), u256(4), u256(5), u256(6), u256(7), u256(8)}));
+	cnote << s0.nextFetch(2);
+	cnote << s1.nextFetch(2);
+	cnote << s2.nextFetch(2);
+	s0.noteBlock(u256(0));
+	s0.doneFetch();
+	cnote << s0.nextFetch(2);
+	s1.noteBlock(u256(2));
+	s1.noteBlock(u256(3));
+	s1.doneFetch();
+	cnote << s1.nextFetch(2);
+	s0.doneFetch();
+	cnote << s0.nextFetch(2);
+
+/*	RangeMask<unsigned> m(0, 100);
+	cnote << m;
+	m += UnsignedRange(3, 10);
+	cnote << m;
+	m += UnsignedRange(11, 16);
+	cnote << m;
+	m += UnsignedRange(10, 11);
+	cnote << m;
+	cnote << ~m;
+	cnote << (~m).lowest(10);
+	for (auto i: (~m).lowest(10))
+		cnote << i;*/
 	return 0;
 }
-#endif
 
-void killBigints(sp::utree const& _this)
-{
-	switch (_this.which())
-	{
-	case sp::utree_type::list_type: for (auto const& i: _this) killBigints(i); break;
-	case sp::utree_type::any_type: delete _this.get<bigint*>(); break;
-	default:;
-	}
-}
-
-void debugOutAST(ostream& _out, sp::utree const& _this)
-{
-	switch (_this.which())
-	{
-	case sp::utree_type::list_type:
-		switch (_this.tag())
-		{
-		case 0: { int n = 0; for (auto const& i: _this) { debugOutAST(_out, i); if (n++) _out << ", "; } break; }
-		case 1: _out << "@ "; debugOutAST(_out, _this.front()); break;
-		case 2: _out << "@@ "; debugOutAST(_out, _this.front()); break;
-		case 3: _out << "[ "; debugOutAST(_out, _this.front()); _out << " ] "; debugOutAST(_out, _this.back()); break;
-		case 4: _out << "[[ "; debugOutAST(_out, _this.front()); _out << " ]] "; debugOutAST(_out, _this.back()); break;
-		case 5: _out << "{ "; for (auto const& i: _this) { debugOutAST(_out, i); _out << " "; } _out << "}"; break;
-		case 6: _out << "$ "; debugOutAST(_out, _this.front()); break;
-		default:
-			{ _out << _this.tag() << ": "; int n = 0; for (auto const& i: _this) { debugOutAST(_out, i); if (n++) _out << ", "; } break; }
-		}
-
-		break;
-	case sp::utree_type::int_type: _out << _this.get<int>(); break;
-	case sp::utree_type::string_type: _out << "\"" << _this.get<sp::basic_string<boost::iterator_range<char const*>, sp::utree_type::string_type>>() << "\""; break;
-	case sp::utree_type::symbol_type: _out << _this.get<sp::basic_string<boost::iterator_range<char const*>, sp::utree_type::symbol_type>>(); break;
-	case sp::utree_type::any_type: _out << *_this.get<bigint*>(); break;
-	default: _out << "nil";
-	}
-}
-
-namespace dev {
-namespace eth {
-namespace parseTreeLLL_ {
-
-template<unsigned N>
-struct tagNode
-{
-	void operator()(sp::utree& n, qi::rule<string::const_iterator, qi::ascii::space_type, sp::utree()>::context_type& c) const
-	{
-		(boost::fusion::at_c<0>(c.attributes) = n).tag(N);
-	}
-};
-
-}}}
-
-void parseTree(string const& _s, sp::utree& o_out)
-{
-	using qi::standard::space;
-	using qi::standard::space_type;
-	using dev::eth::parseTreeLLL_::tagNode;
-	typedef sp::basic_string<std::string, sp::utree_type::symbol_type> symbol_type;
-	typedef string::const_iterator it;
-
-	static const u256 ether = u256(1000000000) * 1000000000;
-	static const u256 finney = u256(1000000000) * 1000000;
-	static const u256 szabo = u256(1000000000) * 1000;
-#if 0
-	qi::rule<it, space_type, sp::utree()> element;
-	qi::rule<it, space_type, sp::utree()> statement;
-	qi::rule<it, string()> str = '"' > qi::lexeme[+(~qi::char_(std::string("\"") + '\0'))] > '"';
-	qi::rule<it, string()> strsh = '\'' > qi::lexeme[+(~qi::char_(std::string(" ;$@()[]{}:\n\t") + '\0'))];
-	qi::rule<it, symbol_type()> symbol = qi::lexeme[+(~qi::char_(std::string(" $@[]{}:();\"\x01-\x1f\x7f") + '\0'))];
-	qi::rule<it, string()> intstr = qi::lexeme[ qi::no_case["0x"][qi::_val = "0x"] >> *qi::char_("0-9a-fA-F")[qi::_val += qi::_1]] | qi::lexeme[+qi::char_("0-9")[qi::_val += qi::_1]];
-	qi::rule<it, bigint()> integer = intstr;
-	qi::rule<it, bigint()> multiplier = qi::lit("wei")[qi::_val = 1] | qi::lit("szabo")[qi::_val = szabo] | qi::lit("finney")[qi::_val = finney] | qi::lit("ether")[qi::_val = ether];
-	qi::rule<it, space_type, bigint()> quantity = integer[qi::_val = qi::_1] >> -multiplier[qi::_val *= qi::_1];
-	qi::rule<it, space_type, sp::utree()> atom = quantity[qi::_val = px::construct<sp::any_ptr>(px::new_<bigint>(qi::_1))] | (str | strsh)[qi::_val = qi::_1] | symbol[qi::_val = qi::_1];
-	qi::rule<it, space_type, sp::utree::list_type()> compound = '{' > *statement > '}';
-/*	qi::rule<it, space_type, sp::utree::list_type()> mload = '@' > element;
-	qi::rule<it, space_type, sp::utree::list_type()> sload = qi::lit("@@") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> mstore = '[' > element > ']' > -qi::lit(":") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> sstore = qi::lit("[[") > element > qi::lit("]]") > -qi::lit(":") > element;
-	qi::rule<it, space_type, sp::utree::list_type()> calldataload = qi::lit("$") > element;*/
-//	qi::rule<it, space_type, sp::utree::list_type()> args = '(' > (element % ',') > ')';
-
-	qi::rule<it, space_type, sp::utree::list_type()> expression;
-	qi::rule<it, space_type, sp::utree()> group = '(' >> expression[qi::_val = qi::_1] >> ')';
-	qi::rule<it, space_type, sp::utree()> factor = atom | group;
-	qi::rule<it, space_type, sp::utree()> mul = '*' >> factor;
-	qi::rule<it, space_type, sp::utree()> div = '/' >> factor;
-	qi::rule<it, space_type, sp::utree()> op = mul[tagNode<10>()] | div[tagNode<11>()];
-	qi::rule<it, space_type, sp::utree::list_type()> term = factor >> !op;
-	expression  = term >> !(('+' >> term) | ('-' >> term));
-
-	//	qi::rule<it, space_type, sp::utree()> extra = sload[tagNode<2>()] | mload[tagNode<1>()] | sstore[tagNode<4>()] | mstore[tagNode<3>()] | calldataload[tagNode<6>()];
-	statement = compound[tagNode<5>()] | (element > ';')[qi::_val = qi::_1];
-	element %= expression;// | extra;
-#endif
-	qi::rule<it, symbol_type()> symbol = qi::lexeme[+(~qi::char_(std::string(" $@[]{}:();\"\x01-\x1f\x7f") + '\0'))];
-	qi::rule<it, string()> intstr = qi::lexeme[ qi::no_case["0x"][qi::_val = "0x"] >> *qi::char_("0-9a-fA-F")[qi::_val += qi::_1]] | qi::lexeme[+qi::char_("0-9")[qi::_val += qi::_1]];
-	qi::rule<it, bigint()> integer = intstr;
-	qi::rule<it, sp::utree()> intnode = integer[qi::_val = px::construct<sp::any_ptr>(px::new_<bigint>(qi::_1))];
-	qi::rule<it, space_type, sp::utree()> funcname = symbol;
-	qi::rule<it, space_type, sp::utree()> statement;
-	qi::rule<it, space_type, sp::utree::list_type()> call = funcname > '(' > funcname > ')';
-	statement = call | intnode | symbol;
-
-	auto ret = _s.cbegin();
-	qi::phrase_parse(ret, _s.cend(), statement, space, qi::skip_flag::dont_postskip, o_out);
-	for (auto i = ret; i != _s.cend(); ++i)
-		if (!isspace(*i))
-			throw std::exception();
-}
-#endif
+/*
 int main(int argc, char** argv)
 {
-#if 0
-	sp::utree out;
-	parseTree("x(2)", out);
-	debugOutAST(cout, out);
-	killBigints(out);
-	cout << endl;
-#endif
-
 	g_logVerbosity = 20;
 
 	short listenPort = 30303;
@@ -322,24 +91,25 @@ int main(int argc, char** argv)
 			remoteHost = argv[i];
 	}
 
-	Host ph("Test", listenPort, "", false, true);
+	Host ph("Test", NetworkPreferences(listenPort, "", false, true));
 	ph.registerCapability(new WhisperHost());
 	auto wh = ph.cap<WhisperHost>();
 
+	ph.start();
+
 	if (!remoteHost.empty())
 		ph.connect(remoteHost, remotePort);
 
 	/// Only interested in the packet if the lowest bit is 1
 	auto w = wh->installWatch(MessageFilter(std::vector<std::pair<bytes, bytes> >({{fromHex("0000000000000000000000000000000000000000000000000000000000000001"), fromHex("0000000000000000000000000000000000000000000000000000000000000001")}})));
 
+
 	for (int i = 0; ; ++i)
 	{
-		this_thread::sleep_for(chrono::milliseconds(1000));
-		ph.process();
 		wh->sendRaw(h256(u256(i * i)).asBytes(), h256(u256(i)).asBytes(), 1000);
 		for (auto i: wh->checkWatch(w))
 			cnote << "New message:" << (u256)h256(wh->message(i).payload);
 	}
-
 	return 0;
 }
+*/
diff --git a/libdevcore/Common.cpp b/libdevcore/Common.cpp
index 325ba274e..8312960c1 100644
--- a/libdevcore/Common.cpp
+++ b/libdevcore/Common.cpp
@@ -27,7 +27,7 @@ using namespace dev;
 namespace dev
 {
 
-char const* Version = "0.6.8b";
+char const* Version = "0.6.9";
 
 }
 
diff --git a/libdevcore/CommonData.cpp b/libdevcore/CommonData.cpp
index 96269bbc1..6e889a6b0 100644
--- a/libdevcore/CommonData.cpp
+++ b/libdevcore/CommonData.cpp
@@ -102,3 +102,181 @@ bytes dev::asNibbles(std::string const& _s)
 	}
 	return ret;
 }
+
+#if 0
+
+/* Following code is copyright 2012-2014 Luke Dashjr
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the standard MIT license.  See COPYING for more details.
+ */
+
+#include <cstdbool>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+static const int8_t b58digits_map[] = {
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1, 0, 1, 2, 3, 4, 5, 6,  7, 8,-1,-1,-1,-1,-1,-1,
+	-1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1,
+	22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1,
+	-1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46,
+	47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1,
+};
+
+bool b58tobin(void *bin, size_t *binszp, const char *b58, size_t b58sz)
+{
+	size_t binsz = *binszp;
+	const unsigned char *b58u = (void*)b58;
+	unsigned char *binu = bin;
+	size_t outisz = (binsz + 3) / 4;
+	uint32_t outi[outisz];
+	uint64_t t;
+	uint32_t c;
+	size_t i, j;
+	uint8_t bytesleft = binsz % 4;
+	uint32_t zeromask = bytesleft ? (0xffffffff << (bytesleft * 8)) : 0;
+	unsigned zerocount = 0;
+
+	if (!b58sz)
+		b58sz = strlen(b58);
+
+	memset(outi, 0, outisz * sizeof(*outi));
+
+	// Leading zeros, just count
+	for (i = 0; i < b58sz && !b58digits_map[b58u[i]]; ++i)
+		++zerocount;
+
+	for ( ; i < b58sz; ++i)
+	{
+		if (b58u[i] & 0x80)
+			// High-bit set on invalid digit
+			return false;
+		if (b58digits_map[b58u[i]] == -1)
+			// Invalid base58 digit
+			return false;
+		c = (unsigned)b58digits_map[b58u[i]];
+		for (j = outisz; j--; )
+		{
+			t = ((uint64_t)outi[j]) * 58 + c;
+			c = (t & 0x3f00000000) >> 32;
+			outi[j] = t & 0xffffffff;
+		}
+		if (c)
+			// Output number too big (carry to the next int32)
+			return false;
+		if (outi[0] & zeromask)
+			// Output number too big (last int32 filled too far)
+			return false;
+	}
+
+	j = 0;
+	switch (bytesleft) {
+		case 3:
+			*(binu++) = (outi[0] &   0xff0000) >> 16;
+		case 2:
+			*(binu++) = (outi[0] &     0xff00) >>  8;
+		case 1:
+			*(binu++) = (outi[0] &       0xff);
+			++j;
+		default:
+			break;
+	}
+
+	for (; j < outisz; ++j)
+	{
+		*(binu++) = (outi[j] >> 0x18) & 0xff;
+		*(binu++) = (outi[j] >> 0x10) & 0xff;
+		*(binu++) = (outi[j] >>    8) & 0xff;
+		*(binu++) = (outi[j] >>    0) & 0xff;
+	}
+
+	// Count canonical base58 byte count
+	binu = bin;
+	for (i = 0; i < binsz; ++i)
+	{
+		if (binu[i])
+			break;
+		--*binszp;
+	}
+	*binszp += zerocount;
+
+	return true;
+}
+
+static
+bool my_dblsha256(void *hash, const void *data, size_t datasz)
+{
+	uint8_t buf[0x20];
+	return b58_sha256_impl(buf, data, datasz) && b58_sha256_impl(hash, buf, sizeof(buf));
+}
+
+int b58check(const void *bin, size_t binsz, const char *base58str, size_t b58sz)
+{
+	unsigned char buf[32];
+	const uint8_t *binc = bin;
+	unsigned i;
+	if (binsz < 4)
+		return -4;
+	if (!my_dblsha256(buf, bin, binsz - 4))
+		return -2;
+	if (memcmp(&binc[binsz - 4], buf, 4))
+		return -1;
+
+	// Check number of zeros is correct AFTER verifying checksum (to avoid possibility of accessing base58str beyond the end)
+	for (i = 0; binc[i] == '\0' && base58str[i] == '1'; ++i)
+	{}  // Just finding the end of zeros, nothing to do in loop
+	if (binc[i] == '\0' || base58str[i] == '1')
+		return -3;
+
+	return binc[0];
+}
+
+static const char b58digits_ordered[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
+{
+	const uint8_t *bin = data;
+	int carry;
+	size_t i, j, high, zcount = 0;
+	size_t size;
+
+	while (zcount < binsz && !bin[zcount])
+		++zcount;
+
+	size = (binsz - zcount) * 138 / 100 + 1;
+	uint8_t buf[size];
+	memset(buf, 0, size);
+
+	for (i = zcount, high = size - 1; i < binsz; ++i, high = j)
+	{
+		for (carry = bin[i], j = size - 1; (j > high) || carry; --j)
+		{
+			carry += 256 * buf[j];
+			buf[j] = carry % 58;
+			carry /= 58;
+		}
+	}
+
+	for (j = 0; j < size && !buf[j]; ++j);
+
+	if (*b58sz <= zcount + size - j)
+	{
+		*b58sz = zcount + size - j + 1;
+		return false;
+	}
+
+	if (zcount)
+		memset(b58, '1', zcount);
+	for (i = zcount; j < size; ++i, ++j)
+		b58[i] = b58digits_ordered[buf[j]];
+	b58[i] = '\0';
+	*b58sz = i + 1;
+
+	return true;
+}
+
+#endif
diff --git a/libdevcore/CommonData.h b/libdevcore/CommonData.h
index 1181e07e8..11850fa69 100644
--- a/libdevcore/CommonData.h
+++ b/libdevcore/CommonData.h
@@ -55,6 +55,11 @@ int fromHex(char _i);
 /// @example fromHex("41626261") == asBytes("Abba")
 bytes fromHex(std::string const& _s);
 
+#if 0
+std::string toBase58(bytesConstRef _data);
+bytes fromBase58(std::string const& _s);
+#endif
+
 /// Converts byte array to a string containing the same (binary) data. Unless
 /// the byte array happens to contain ASCII data, this won't be printable.
 inline std::string asString(bytes const& _b)
diff --git a/libdevcore/CommonIO.h b/libdevcore/CommonIO.h
index 068c5c777..98c5a96c7 100644
--- a/libdevcore/CommonIO.h
+++ b/libdevcore/CommonIO.h
@@ -49,15 +49,6 @@ void writeFile(std::string const& _file, bytes const& _data);
 /// Nicely renders the given bytes to a string, optionally as HTML.
 std::string memDump(bytes const& _b, unsigned _w = 8, bool _html = false);
 
-/// Converts arbitrary value to string representation using std::stringstream.
-template <class _T>
-std::string toString(_T const& _t)
-{
-	std::ostringstream o;
-	o << _t;
-	return o.str();
-}
-
 // Stream I/O functions.
 // Provides templated stream I/O for all STL collections so they can be shifted on to any iostream-like interface.
 
@@ -223,4 +214,15 @@ template <class T, class U> inline std::ostream& operator<<(std::ostream& _out,
 
 template <class _S, class _T> _S& operator<<(_S& _out, std::shared_ptr<_T> const& _p) { if (_p) _out << "@" << (*_p); else _out << "nullptr"; return _out; }
 
+// Functions that use streaming stuff.
+
+/// Converts arbitrary value to string representation using std::stringstream.
+template <class _T>
+std::string toString(_T const& _t)
+{
+	std::ostringstream o;
+	o << _t;
+	return o.str();
+}
+
 }
diff --git a/libdevcore/RLP.h b/libdevcore/RLP.h
index ed311a082..35e1d1dcf 100644
--- a/libdevcore/RLP.h
+++ b/libdevcore/RLP.h
@@ -160,7 +160,6 @@ public:
 	explicit operator std::string() const { return toString(); }
 	explicit operator RLPs() const { return toList(); }
 	explicit operator byte() const { return toInt<byte>(); }
-	explicit operator unsigned() const { return toInt<unsigned>(); }
 	explicit operator u256() const { return toInt<u256>(); }
 	explicit operator bigint() const { return toInt<bigint>(); }
 	template <unsigned _N> explicit operator FixedHash<_N>() const { return toHash<FixedHash<_N>>(); }
@@ -213,8 +212,8 @@ public:
 		std::pair<T, U> ret;
 		if (isList())
 		{
-			ret.first = (*this)[0].operator T();
-			ret.second = (*this)[1].operator U();
+			ret.first = (T)(*this)[0];
+			ret.second = (U)(*this)[1];
 		}
 		return ret;
 	}
diff --git a/libdevcore/RangeMask.cpp b/libdevcore/RangeMask.cpp
new file mode 100644
index 000000000..5317e00e8
--- /dev/null
+++ b/libdevcore/RangeMask.cpp
@@ -0,0 +1,22 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file RangeMask.cpp
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#include "RangeMask.h"
diff --git a/libdevcore/RangeMask.h b/libdevcore/RangeMask.h
new file mode 100644
index 000000000..f1b0043ff
--- /dev/null
+++ b/libdevcore/RangeMask.h
@@ -0,0 +1,212 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file EthereumHost.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#pragma once
+
+#include <map>
+#include <utility>
+#include <vector>
+#include <iostream>
+
+namespace dev
+{
+
+class RLPStream;
+
+using UnsignedRange = std::pair<unsigned, unsigned>;
+using UnsignedRanges = std::vector<UnsignedRange>;
+
+template <class T>
+class RangeMask
+{
+	template <class U> friend std::ostream& operator<<(std::ostream& _out, RangeMask<U> const& _r);
+
+public:
+	using Range = std::pair<T, T>;
+	using Ranges = std::vector<Range>;
+
+	RangeMask() {}
+	RangeMask(T _begin, T _end): m_all(_begin, _end) {}
+	RangeMask(Range const& _c): m_all(_c) {}
+
+	RangeMask operator+(RangeMask const& _m) const { return RangeMask(*this) += _m; }
+
+	RangeMask lowest(T _items) const
+	{
+		RangeMask ret(m_all);
+		for (auto i = m_ranges.begin(); i != m_ranges.end() && _items; ++i)
+			_items -= (ret.m_ranges[i->first] = std::min(i->first + _items, i->second)) - i->first;
+		return ret;
+	}
+
+	RangeMask operator~() const
+	{
+		RangeMask ret(m_all);
+		T last = m_all.first;
+		for (auto i: m_ranges)
+		{
+			if (i.first != last)
+				ret.m_ranges[last] = i.first;
+			last = i.second;
+		}
+		if (last != m_all.second)
+			ret.m_ranges[last] = m_all.second;
+		return ret;
+	}
+
+	RangeMask& operator+=(RangeMask const& _m)
+	{
+		for (auto const& i: _m.m_ranges)
+			operator+=(i);
+		return *this;
+	}
+	RangeMask& operator+=(UnsignedRange const& _m)
+	{
+		for (auto i = _m.first; i < _m.second;)
+		{
+			// for each number, we find the element equal or next lower. this, if any, must contain the value.
+			auto uit = m_ranges.upper_bound(i);
+			auto it = uit == m_ranges.begin() ? m_ranges.end() : std::prev(uit);
+			if (it == m_ranges.end() || it->second < i)
+				// lower range is too low to merge.
+				// if the next higher range is too high.
+				if (uit == m_ranges.end() || uit->first > _m.second)
+				{
+					// just create a new range
+					m_ranges[i] = _m.second;
+					break;
+				}
+				else
+				{
+					if (uit->first == i)
+						// move i to end of range
+						i = uit->second;
+					else
+					{
+						// merge with the next higher range
+						// move i to end of range
+						i = m_ranges[i] = uit->second;
+						i = uit->second;
+						m_ranges.erase(uit);
+					}
+				}
+			else if (it->second == i)
+			{
+				// if the next higher range is too high.
+				if (uit == m_ranges.end() || uit->first > _m.second)
+				{
+					// merge with the next lower range
+					m_ranges[it->first] = _m.second;
+					break;
+				}
+				else
+				{
+					// merge with both next lower & next higher.
+					i = m_ranges[it->first] = uit->second;
+					m_ranges.erase(uit);
+				}
+			}
+			else
+				i = it->second;
+		}
+		return *this;
+	}
+
+	RangeMask& operator+=(T _i)
+	{
+		return operator+=(Range(_i, _i + 1));
+	}
+
+	bool contains(T _i) const
+	{
+		auto it = m_ranges.upper_bound(_i);
+		if (it == m_ranges.begin())
+			return false;
+		return (--it)->second > _i;
+	}
+
+	bool empty() const
+	{
+		return m_ranges.empty();
+	}
+
+	bool full() const
+	{
+		return m_ranges.size() == 1 && m_ranges.begin()->first == m_all.first && m_ranges.begin()->second == m_all.second;
+	}
+
+	void clear()
+	{
+		m_ranges.clear();
+	}
+
+	std::pair<T, T> const& all() const { return m_all; }
+
+	class const_iterator
+	{
+		friend class RangeMask;
+
+	public:
+		const_iterator() {}
+
+		T operator*() const { return m_value; }
+		const_iterator& operator++() { if (m_owner) m_value = m_owner->next(m_value); return *this; }
+		const_iterator operator++(int) { auto ret = *this; if (m_owner) m_value = m_owner->next(m_value); return ret; }
+
+		bool operator==(const_iterator const& _i) const { return m_owner == _i.m_owner && m_value == _i.m_value; }
+		bool operator!=(const_iterator const& _i) const { return !operator==(_i); }
+		bool operator<(const_iterator const& _i) const { return m_value < _i.m_value; }
+
+	private:
+		const_iterator(RangeMask const& _m, bool _end): m_owner(&_m), m_value(_m.m_ranges.empty() || _end ? _m.m_all.second : _m.m_ranges.begin()->first) {}
+
+		RangeMask const* m_owner = nullptr;
+		T m_value = 0;
+	};
+
+	const_iterator begin() const { return const_iterator(*this, false); }
+	const_iterator end() const { return const_iterator(*this, true); }
+	T next(T _t) const
+	{
+		_t++;
+		// find next item in range at least _t
+		auto uit = m_ranges.upper_bound(_t);	 // > _t
+		auto it = uit == m_ranges.begin() ? m_ranges.end() : std::prev(uit);
+		if (it != m_ranges.end() && it->first <= _t && it->second > _t)
+			return _t;
+		return uit == m_ranges.end() ? m_all.second : uit->first;
+	}
+
+private:
+	UnsignedRange m_all;
+	std::map<T, T> m_ranges;
+};
+
+template <class T> inline std::ostream& operator<<(std::ostream& _out, RangeMask<T> const& _r)
+{
+	_out << _r.m_all.first << "{ ";
+	for (auto const& i: _r.m_ranges)
+		_out << "[" << i.first << ", " << i.second << ") ";
+	_out << "}" << _r.m_all.second;
+	return _out;
+}
+
+}
diff --git a/libdevcore/Worker.cpp b/libdevcore/Worker.cpp
new file mode 100644
index 000000000..29ff766d7
--- /dev/null
+++ b/libdevcore/Worker.cpp
@@ -0,0 +1,63 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file Worker.cpp
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#include "Worker.h"
+
+#include <chrono>
+#include <thread>
+#include "Log.h"
+using namespace std;
+using namespace dev;
+
+void Worker::startWorking()
+{
+	cdebug << "startWorking for thread" << m_name;
+	Guard l(x_work);
+	if (m_work)
+		return;
+	cdebug << "Spawning" << m_name;
+	m_stop = false;
+	m_work.reset(new thread([&]()
+	{
+		setThreadName(m_name.c_str());
+		while (!m_stop)
+		{
+			this_thread::sleep_for(chrono::milliseconds(30));
+			doWork();
+		}
+		cdebug << "Finishing up worker thread";
+		doneWorking();
+	}));
+}
+
+void Worker::stopWorking()
+{
+	cdebug << "stopWorking for thread" << m_name;
+	Guard l(x_work);
+	if (!m_work)
+		return;
+	cdebug << "Stopping" << m_name;
+	m_stop = true;
+	m_work->join();
+	m_work.reset();
+	cdebug << "Stopped" << m_name;
+}
+
diff --git a/libdevcore/Worker.h b/libdevcore/Worker.h
new file mode 100644
index 000000000..8f0baaf60
--- /dev/null
+++ b/libdevcore/Worker.h
@@ -0,0 +1,59 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file Worker.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#pragma once
+
+#include <string>
+#include <thread>
+#include "Guards.h"
+
+namespace dev
+{
+
+class Worker
+{
+protected:
+	Worker(std::string const& _name = "anon"): m_name(_name) {}
+
+	/// Move-constructor.
+	Worker(Worker&& _m) { std::swap(m_name, _m.m_name); }
+
+	/// Move-assignment.
+	Worker& operator=(Worker&& _m) { std::swap(m_name, _m.m_name); return *this; }
+
+	virtual ~Worker() { stopWorking(); }
+
+	void setName(std::string _n) { if (!isWorking()) m_name = _n; }
+
+	void startWorking();
+	void stopWorking();
+	bool isWorking() const { Guard l(x_work); return !!m_work; }
+	virtual void doWork() = 0;
+	virtual void doneWorking() {}
+
+private:
+	mutable Mutex x_work;						///< Lock for the network existance.
+	std::unique_ptr<std::thread> m_work;		///< The network thread.
+	bool m_stop = false;
+	std::string m_name;
+};
+
+}
diff --git a/libdevcrypto/FileSystem.cpp b/libdevcrypto/FileSystem.cpp
index 1fb38b57f..e161c3234 100644
--- a/libdevcrypto/FileSystem.cpp
+++ b/libdevcrypto/FileSystem.cpp
@@ -31,9 +31,8 @@
 #include <boost/filesystem.hpp>
 using namespace std;
 using namespace dev;
-using namespace dev::eth;
 
-std::string dev::eth::getDataDir()
+std::string dev::getDataDir()
 {
 #ifdef _WIN32
 	char path[1024] = "";
diff --git a/libdevcrypto/FileSystem.h b/libdevcrypto/FileSystem.h
index 9c597c421..605545b0d 100644
--- a/libdevcrypto/FileSystem.h
+++ b/libdevcrypto/FileSystem.h
@@ -27,11 +27,8 @@
 
 namespace dev
 {
-namespace eth
-{
 
 /// @returns the path for user data.
 std::string getDataDir();
 
 }
-}
diff --git a/libethcore/BlockInfo.h b/libethcore/BlockInfo.h
index 8186acaee..283f11b88 100644
--- a/libethcore/BlockInfo.h
+++ b/libethcore/BlockInfo.h
@@ -56,7 +56,7 @@ extern u256 c_genesisDifficulty;
 struct BlockInfo
 {
 public:
-	h256 hash;						///< SHA3 hash of the entire block! Not serialised (the only member not contained in a block header).
+	h256 hash;						///< SHA3 hash of the block header! Not serialised (the only member not contained in a block header).
 	h256 parentHash;
 	h256 sha3Uncles;
 	Address coinbaseAddress;
diff --git a/libethcore/CommonEth.cpp b/libethcore/CommonEth.cpp
index f96fb5480..eed8b4bb9 100644
--- a/libethcore/CommonEth.cpp
+++ b/libethcore/CommonEth.cpp
@@ -34,7 +34,7 @@ namespace dev
 namespace eth
 {
 
-const unsigned c_protocolVersion = 32;
+const unsigned c_protocolVersion = 33;
 const unsigned c_databaseVersion = 1;
 
 static const vector<pair<u256, string>> g_units =
diff --git a/libethereum/BlockChain.cpp b/libethereum/BlockChain.cpp
index 716add2ae..79cccd4ef 100644
--- a/libethereum/BlockChain.cpp
+++ b/libethereum/BlockChain.cpp
@@ -108,6 +108,20 @@ bytes BlockChain::createGenesisBlock()
 }
 
 BlockChain::BlockChain(std::string _path, bool _killExisting)
+{
+	// Initialise with the genesis as the last block on the longest chain.
+	m_genesisHash = BlockChain::genesis().hash;
+	m_genesisBlock = BlockChain::createGenesisBlock();
+
+	open(_path, _killExisting);
+}
+
+BlockChain::~BlockChain()
+{
+	close();
+}
+
+void BlockChain::open(std::string _path, bool _killExisting)
 {
 	if (_path.empty())
 		_path = Defaults::get()->m_dbPath;
@@ -127,10 +141,6 @@ BlockChain::BlockChain(std::string _path, bool _killExisting)
 	if (!m_extrasDB)
 		throw DatabaseAlreadyOpen();
 
-	// Initialise with the genesis as the last block on the longest chain.
-	m_genesisHash = BlockChain::genesis().hash;
-	m_genesisBlock = BlockChain::createGenesisBlock();
-
 	if (!details(m_genesisHash))
 	{
 		// Insert details of genesis block.
@@ -150,11 +160,16 @@ BlockChain::BlockChain(std::string _path, bool _killExisting)
 	cnote << "Opened blockchain DB. Latest: " << currentHash();
 }
 
-BlockChain::~BlockChain()
+void BlockChain::close()
 {
 	cnote << "Closing blockchain DB";
 	delete m_extrasDB;
 	delete m_db;
+	m_lastBlockHash = m_genesisHash;
+	m_details.clear();
+	m_blooms.clear();
+	m_traces.clear();
+	m_cache.clear();
 }
 
 template <class T, class V>
@@ -245,21 +260,24 @@ h256s BlockChain::import(bytes const& _block, OverlayDB const& _db)
 	auto newHash = BlockInfo::headerHash(_block);
 
 	// Check block doesn't already exist first!
-	if (details(newHash))
+	if (isKnown(newHash))
 	{
 		clog(BlockChainNote) << newHash << ": Not new.";
 		throw AlreadyHaveBlock();
 	}
 
 	// Work out its number as the parent's number + 1
-	auto pd = details(bi.parentHash);
-	if (!pd)
+	if (!isKnown(bi.parentHash))
 	{
 		clog(BlockChainNote) << newHash << ": Unknown parent " << bi.parentHash;
 		// We don't know the parent (yet) - discard for now. It'll get resent to us if we find out about its ancestry later on.
 		throw UnknownParent();
 	}
 
+	auto pd = details(bi.parentHash);
+	if (!pd)
+		cwarn << "Odd: details is returning false despite block known:" << RLP(pd.rlp());
+
 	// Check it's not crazy
 	if (bi.timestamp > (u256)time(0))
 	{
@@ -432,6 +450,20 @@ h256Set BlockChain::allUnclesFrom(h256 _parent) const
 	return ret;
 }
 
+bool BlockChain::isKnown(h256 _hash) const
+{
+	if (_hash == m_genesisHash)
+		return true;
+	{
+		ReadGuard l(x_cache);
+		if (m_cache.count(_hash))
+			return true;
+	}
+	string d;
+	m_db->Get(m_readOptions, ldb::Slice((char const*)&_hash, 32), &d);
+	return !!d.size();
+}
+
 bytes BlockChain::block(h256 _hash) const
 {
 	if (_hash == m_genesisHash)
diff --git a/libethereum/BlockChain.h b/libethereum/BlockChain.h
index c0b3988a9..cf33a5104 100644
--- a/libethereum/BlockChain.h
+++ b/libethereum/BlockChain.h
@@ -70,6 +70,8 @@ public:
 	BlockChain(std::string _path, bool _killExisting = false);
 	~BlockChain();
 
+	void reopen(std::string _path, bool _killExisting = false) { close(); open(_path, _killExisting); }
+
 	/// (Potentially) renders invalid existing bytesConstRef returned by lastBlock.
 	/// To be called from main loop every 100ms or so.
 	void process();
@@ -85,6 +87,9 @@ public:
 	/// @returns the block hashes of any blocks that came into/went out of the canonical block chain.
 	h256s import(bytes const& _block, OverlayDB const& _stateDB);
 
+	/// Returns true if the given block is known (though not necessarily a part of the canon chain).
+	bool isKnown(h256 _hash) const;
+
 	/// Get the familial details concerning a block (or the most recent mined if none given). Thread-safe.
 	BlockDetails details(h256 _hash) const { return queryExtras<BlockDetails, 0>(_hash, m_details, x_details, NullBlockDetails); }
 	BlockDetails details() const { return details(currentHash()); }
@@ -143,6 +148,9 @@ public:
 	h256s treeRoute(h256 _from, h256 _to, h256* o_common = nullptr, bool _pre = true, bool _post = true) const;
 
 private:
+	void open(std::string _path, bool _killExisting = false);
+	void close();
+
 	template<class T, unsigned N> T queryExtras(h256 _h, std::map<h256, T>& _m, boost::shared_mutex& _x, T const& _n) const
 	{
 		{
diff --git a/libethereum/BlockQueue.cpp b/libethereum/BlockQueue.cpp
index 21aeb5a72..a845965d5 100644
--- a/libethereum/BlockQueue.cpp
+++ b/libethereum/BlockQueue.cpp
@@ -74,21 +74,24 @@ bool BlockQueue::import(bytesConstRef _block, BlockChain const& _bc)
 
 	// Check it's not in the future
 	if (bi.timestamp > (u256)time(0))
+	{
 		m_future.insert(make_pair((unsigned)bi.timestamp, _block.toBytes()));
+		cblockq << "OK - queued for future.";
+	}
 	else
 	{
 		// We now know it.
-		if (!m_readySet.count(bi.parentHash) && !m_drainingSet.count(bi.parentHash) && !_bc.details(bi.parentHash))
+		if (!m_readySet.count(bi.parentHash) && !m_drainingSet.count(bi.parentHash) && !_bc.isKnown(bi.parentHash))
 		{
 			// We don't know the parent (yet) - queue it up for later. It'll get resent to us if we find out about its ancestry later on.
-//			cnote << "OK - queued for future.";
+			cblockq << "OK - queued as unknown parent:" << bi.parentHash.abridged();
 			m_unknown.insert(make_pair(bi.parentHash, make_pair(h, _block.toBytes())));
 			m_unknownSet.insert(h);
 		}
 		else
 		{
 			// If valid, append to blocks.
-//			cnote << "OK - ready for chain insertion.";
+			cblockq << "OK - ready for chain insertion.";
 			m_ready.push_back(_block.toBytes());
 			m_readySet.insert(h);
 
diff --git a/libethereum/BlockQueue.h b/libethereum/BlockQueue.h
index 5a4a86ad6..20bc4ce59 100644
--- a/libethereum/BlockQueue.h
+++ b/libethereum/BlockQueue.h
@@ -34,7 +34,7 @@ namespace eth
 
 class BlockChain;
 
-struct BlockQueueChannel: public LogChannel { static const char* name() { return "[]Q"; } static const int verbosity = 7; };
+struct BlockQueueChannel: public LogChannel { static const char* name() { return "[]Q"; } static const int verbosity = 4; };
 #define cblockq dev::LogOutputStream<dev::eth::BlockQueueChannel, true>()
 
 /**
@@ -64,6 +64,9 @@ public:
 	/// Get information on the items queued.
 	std::pair<unsigned, unsigned> items() const { ReadGuard l(m_lock); return std::make_pair(m_ready.size(), m_unknown.size()); }
 
+	/// Clear everything.
+	void clear() { WriteGuard l(m_lock); m_readySet.clear(); m_drainingSet.clear(); m_ready.clear(); m_unknownSet.clear(); m_unknown.clear(); m_future.clear(); }
+
 private:
 	void noteReadyWithoutWriteGuard(h256 _b);
 	void notePresentWithoutWriteGuard(bytesConstRef _block);
diff --git a/libethereum/Client.cpp b/libethereum/Client.cpp
index 3bc159f17..de0077f89 100644
--- a/libethereum/Client.cpp
+++ b/libethereum/Client.cpp
@@ -53,94 +53,107 @@ void VersionChecker::setOk()
 	}
 }
 
-Client::Client(std::string const& _clientVersion, Address _us, std::string const& _dbPath, bool _forceClean):
-	m_clientVersion(_clientVersion),
-	m_vc(_dbPath),
-	m_bc(_dbPath, !m_vc.ok() || _forceClean),
-	m_stateDB(State::openDB(_dbPath, !m_vc.ok() || _forceClean)),
-	m_preMine(_us, m_stateDB),
-	m_postMine(_us, m_stateDB)
-{
-	setMiningThreads();
-	if (_dbPath.size())
-		Defaults::setDBPath(_dbPath);
-	m_vc.setOk();
-	work();
-}
-
 Client::Client(p2p::Host* _extNet, std::string const& _dbPath, bool _forceClean, u256 _networkId):
+	Worker("eth"),
 	m_vc(_dbPath),
 	m_bc(_dbPath, !m_vc.ok() || _forceClean),
 	m_stateDB(State::openDB(_dbPath, !m_vc.ok() || _forceClean)),
 	m_preMine(Address(), m_stateDB),
 	m_postMine(Address(), m_stateDB)
 {
-	m_extHost = _extNet->registerCapability(new EthereumHost(m_bc, _networkId));
+	m_host = _extNet->registerCapability(new EthereumHost(m_bc, m_tq, m_bq, _networkId));
 
-//	setMiningThreads();
+	setMiningThreads();
 	if (_dbPath.size())
 		Defaults::setDBPath(_dbPath);
 	m_vc.setOk();
-	work();
+	doWork();
+
+	startWorking();
 }
 
 Client::~Client()
 {
-	if (m_work)
-	{
-		if (m_workState.load(std::memory_order_acquire) == Active)
-			m_workState.store(Deleting, std::memory_order_release);
-		while (m_workState.load(std::memory_order_acquire) != Deleted)
-			this_thread::sleep_for(chrono::milliseconds(10));
-		m_work->join();
-		m_work.reset(nullptr);
-	}
-	stopNetwork();
+	stopWorking();
 }
 
-void Client::ensureWorking()
+void Client::setNetworkId(u256 _n)
 {
-	static const char* c_threadName = "eth";
+	if (auto h = m_host.lock())
+		h->setNetworkId(_n);
+}
 
-	if (!m_work)
-		m_work.reset(new thread([&]()
-		{
-			setThreadName(c_threadName);
-			m_workState.store(Active, std::memory_order_release);
-			while (m_workState.load(std::memory_order_acquire) != Deleting)
-				work();
-			m_workState.store(Deleted, std::memory_order_release);
-
-			// Synchronise the state according to the head of the block chain.
-			// TODO: currently it contains keys for *all* blocks. Make it remove old ones.
-			WriteGuard l(x_stateDB);
-			m_preMine.sync(m_bc);
-			m_postMine = m_preMine;
-		}));
+DownloadMan const* Client::downloadMan() const { if (auto h = m_host.lock()) return &(h->downloadMan()); return nullptr; }
+bool Client::isSyncing() const { if (auto h = m_host.lock()) return h->isSyncing(); return false; }
+
+void Client::doneWorking()
+{
+	// Synchronise the state according to the head of the block chain.
+	// TODO: currently it contains keys for *all* blocks. Make it remove old ones.
+	WriteGuard l(x_stateDB);
+	m_preMine.sync(m_bc);
+	m_postMine = m_preMine;
 }
 
 void Client::flushTransactions()
 {
-	work();
+	doWork();
+}
+
+void Client::killChain()
+{
+	bool wasMining = isMining();
+	if (wasMining)
+		stopMining();
+	stopWorking();
+
+	m_tq.clear();
+	m_bq.clear();
+	m_miners.clear();
+	m_preMine = State();
+	m_postMine = State();
+
+	{
+		WriteGuard l(x_stateDB);
+		m_stateDB = OverlayDB();
+		m_stateDB = State::openDB(Defaults::dbPath(), true);
+	}
+	m_bc.reopen(Defaults::dbPath(), true);
+
+	m_preMine = State(Address(), m_stateDB);
+	m_postMine = State(Address(), m_stateDB);
+
+	if (auto h = m_host.lock())
+		h->reset();
+
+	doWork();
+
+	setMiningThreads(0);
+
+	startWorking();
+	if (wasMining)
+		startMining();
 }
 
 void Client::clearPending()
 {
-	WriteGuard l(x_stateDB);
-	if (!m_postMine.pending().size())
-		return;
 	h256Set changeds;
-	for (unsigned i = 0; i < m_postMine.pending().size(); ++i)
-		appendFromNewPending(m_postMine.bloom(i), changeds);
-	changeds.insert(PendingChangedFilter);
-	m_postMine = m_preMine;
+	{
+		WriteGuard l(x_stateDB);
+		if (!m_postMine.pending().size())
+			return;
+		for (unsigned i = 0; i < m_postMine.pending().size(); ++i)
+			appendFromNewPending(m_postMine.bloom(i), changeds);
+		changeds.insert(PendingChangedFilter);
+		m_postMine = m_preMine;
+	}
 
-	if (!m_extHost.lock())
 	{
 		ReadGuard l(x_miners);
 		for (auto& m: m_miners)
 			m.noteStateChange();
 	}
+
 	noteChanged(changeds);
 }
 
@@ -211,111 +224,10 @@ void Client::appendFromNewBlock(h256 _block, h256Set& o_changed) const
 			o_changed.insert(i.first);
 }
 
-void Client::startNetwork(unsigned short _listenPort, std::string const& _seedHost, unsigned short _port, NodeMode _mode, unsigned _peers, string const& _publicIP, bool _upnp, u256 _networkId)
-{
-	static const char* c_threadName = "net";
-
-	{
-		UpgradableGuard l(x_net);
-		if (m_net.get())
-			return;
-		{
-			UpgradeGuard ul(l);
-
-			if (!m_workNet)
-				m_workNet.reset(new thread([&]()
-				{
-					setThreadName(c_threadName);
-					m_workNetState.store(Active, std::memory_order_release);
-					while (m_workNetState.load(std::memory_order_acquire) != Deleting)
-						workNet();
-					m_workNetState.store(Deleted, std::memory_order_release);
-				}));
-
-			if (!m_extHost.lock())
-			{
-				try
-				{
-					m_net.reset(new Host(m_clientVersion, _listenPort, _publicIP, _upnp));
-				}
-				catch (std::exception const&)
-				{
-					// Probably already have the port open.
-					cwarn << "Could not initialize with specified/default port. Trying system-assigned port";
-					m_net.reset(new Host(m_clientVersion, 0, _publicIP, _upnp));
-				}
-				if (_mode == NodeMode::Full)
-					m_net->registerCapability(new EthereumHost(m_bc, _networkId));
-			}
-		}
-		m_net->setIdealPeerCount(_peers);
-	}
-
-	if (!m_extHost.lock())
-		if (_seedHost.size())
-			connect(_seedHost, _port);
-
-	ensureWorking();
-}
-
-void Client::stopNetwork()
-{
-	UpgradableGuard l(x_net);
-
-	if (m_workNet)
-	{
-		if (m_workNetState.load(std::memory_order_acquire) == Active)
-			m_workNetState.store(Deleting, std::memory_order_release);
-		while (m_workNetState.load(std::memory_order_acquire) != Deleted)
-			this_thread::sleep_for(chrono::milliseconds(10));
-		m_workNet->join();
-	}
-	if (m_net)
-	{
-		UpgradeGuard ul(l);
-		m_net.reset(nullptr);
-		m_workNet.reset(nullptr);
-	}
-}
-
-std::vector<PeerInfo> Client::peers()
-{
-	ReadGuard l(x_net);
-	return m_net ? m_net->peers() : std::vector<PeerInfo>();
-}
-
-size_t Client::peerCount() const
-{
-	ReadGuard l(x_net);
-	return m_net ? m_net->peerCount() : 0;
-}
-
-void Client::setIdealPeerCount(size_t _n) const
-{
-	ReadGuard l(x_net);
-	if (m_net)
-		return m_net->setIdealPeerCount(_n);
-}
-
-bytes Client::savePeers()
-{
-	ReadGuard l(x_net);
-	if (m_net)
-		return m_net->savePeers();
-	return bytes();
-}
-
-void Client::restorePeers(bytesConstRef _saved)
-{
-	ReadGuard l(x_net);
-	if (m_net)
-		return m_net->restorePeers(_saved);
-}
-
 void Client::setForceMining(bool _enable)
 {
 	 m_forceMining = _enable;
-	 if (!m_extHost.lock())
+	 if (!m_host.lock())
 	 {
 		 ReadGuard l(x_miners);
 		 for (auto& m: m_miners)
@@ -323,19 +235,8 @@ void Client::setForceMining(bool _enable)
 	 }
 }
 
-void Client::connect(std::string const& _seedHost, unsigned short _port)
-{
-	ReadGuard l(x_net);
-	if (!m_net.get())
-		return;
-	m_net->connect(_seedHost, _port);
-}
-
 void Client::setMiningThreads(unsigned _threads)
 {
-	if (m_extHost.lock())
-		return;
-
 	stopMining();
 
 	auto t = _threads ? _threads : thread::hardware_concurrency();
@@ -350,8 +251,6 @@ void Client::setMiningThreads(unsigned _threads)
 MineProgress Client::miningProgress() const
 {
 	MineProgress ret;
-	if (m_extHost.lock())
-		return ret;
 	ReadGuard l(x_miners);
 	for (auto& m: m_miners)
 		ret.combine(m.miningProgress());
@@ -361,8 +260,6 @@ MineProgress Client::miningProgress() const
 std::list<MineInfo> Client::miningHistory()
 {
 	std::list<MineInfo> ret;
-	if (m_extHost.lock())
-		return ret;
 
 	ReadGuard l(x_miners);
 	if (m_miners.empty())
@@ -404,7 +301,7 @@ void Client::setupState(State& _s)
 
 void Client::transact(Secret _secret, u256 _value, Address _dest, bytes const& _data, u256 _gas, u256 _gasPrice)
 {
-	ensureWorking();
+	startWorking();
 
 	Transaction t;
 //	cdebug << "Nonce at " << toAddress(_secret) << " pre:" << m_preMine.transactionsFrom(toAddress(_secret)) << " post:" << m_postMine.transactionsFrom(toAddress(_secret));
@@ -446,7 +343,7 @@ bytes Client::call(Secret _secret, u256 _value, Address _dest, bytes const& _dat
 
 Address Client::transact(Secret _secret, u256 _endowment, bytes const& _init, u256 _gas, u256 _gasPrice)
 {
-	ensureWorking();
+	startWorking();
 
 	Transaction t;
 	{
@@ -466,47 +363,18 @@ Address Client::transact(Secret _secret, u256 _endowment, bytes const& _init, u2
 
 void Client::inject(bytesConstRef _rlp)
 {
-	ensureWorking();
+	startWorking();
 
 	m_tq.attemptImport(_rlp);
 }
 
-void Client::workNet()
-{
-	// Process network events.
-	// Synchronise block chain with network.
-	// Will broadcast any of our (new) transactions and blocks, and collect & add any of their (new) transactions and blocks.
-	{
-		ReadGuard l(x_net);
-		if (m_net)
-		{
-			cwork << "NETWORK";
-			m_net->process();	// must be in guard for now since it uses the blockchain.
-
-			// returns h256Set as block hashes, once for each block that has come in/gone out.
-			if (m_net->cap<EthereumHost>())
-			{
-				cwork << "NET <==> TQ ; CHAIN ==> NET ==> BQ";
-				m_net->cap<EthereumHost>()->sync(m_tq, m_bq);
-				cwork << "TQ:" << m_tq.items() << "; BQ:" << m_bq.items();
-			}
-		}
-	}
-
-	if (auto h = m_extHost.lock())
-		h->sync(m_tq, m_bq);
-
-	this_thread::sleep_for(chrono::milliseconds(1));
-}
-
-void Client::work()
+void Client::doWork()
 {
 	// TODO: Use condition variable rather than polling.
 
 	cworkin << "WORK";
 	h256Set changeds;
 
-	if (!m_extHost.lock())
 	{
 		ReadGuard l(x_miners);
 		for (auto& m: m_miners)
@@ -557,7 +425,8 @@ void Client::work()
 		cwork << "preSTATE <== CHAIN";
 		if (m_preMine.sync(m_bc) || m_postMine.address() != m_preMine.address())
 		{
-			cnote << "New block on chain: Restarting mining operation.";
+			if (isMining())
+				cnote << "New block on chain: Restarting mining operation.";
 			m_postMine = m_preMine;
 			rsm = true;
 			changeds.insert(PendingChangedFilter);
@@ -573,11 +442,12 @@ void Client::work()
 				appendFromNewPending(i, changeds);
 			changeds.insert(PendingChangedFilter);
 
-			cnote << "Additional transaction ready: Restarting mining operation.";
+			if (isMining())
+				cnote << "Additional transaction ready: Restarting mining operation.";
 			rsm = true;
 		}
 	}
-	if (!m_extHost.lock() && rsm)
+	if (rsm)
 	{
 		ReadGuard l(x_miners);
 		for (auto& m: m_miners)
diff --git a/libethereum/Client.h b/libethereum/Client.h
index 8bdb48051..d00bf53ba 100644
--- a/libethereum/Client.h
+++ b/libethereum/Client.h
@@ -29,6 +29,7 @@
 #include <libdevcore/Common.h>
 #include <libdevcore/CommonIO.h>
 #include <libdevcore/Guards.h>
+#include <libdevcore/Worker.h>
 #include <libevm/FeeStructure.h>
 #include <libethcore/Dagger.h>
 #include <libp2p/Common.h>
@@ -47,6 +48,7 @@ namespace eth
 {
 
 class Client;
+class DownloadMan;
 
 enum ClientWorkState
 {
@@ -108,14 +110,11 @@ struct WorkChannel: public LogChannel { static const char* name() { return "-W-"
 /**
  * @brief Main API hub for interfacing with Ethereum.
  */
-class Client: public MinerHost, public Interface
+class Client: public MinerHost, public Interface, Worker
 {
 	friend class Miner;
 
 public:
-	/// Original Constructor.
-	explicit Client(std::string const& _clientVersion, Address _us = Address(), std::string const& _dbPath = std::string(), bool _forceClean = false);
-
 	/// New-style Constructor.
 	explicit Client(p2p::Host* _host, std::string const& _dbPath = std::string(), bool _forceClean = false, u256 _networkId = 0);
 
@@ -165,6 +164,9 @@ public:
 
 	// [EXTRA API]:
 
+	/// @returns the length of the chain.
+	virtual unsigned number() const { return m_bc.number(); }
+
 	/// Get a map containing each of the pending transactions.
 	/// @TODO: Remove in favour of transactions().
 	Transactions pending() const { return m_postMine.pending(); }
@@ -192,32 +194,6 @@ public:
 	/// Get the object representing the current canonical blockchain.
 	BlockChain const& blockChain() const { return m_bc; }
 
-	// Misc stuff:
-
-	void setClientVersion(std::string const& _name) { m_clientVersion = _name; }
-
-	// Network stuff:
-
-	/// Get information on the current peer set.
-	std::vector<p2p::PeerInfo> peers();
-	/// Same as peers().size(), but more efficient.
-	size_t peerCount() const;
-	/// Same as peers().size(), but more efficient.
-	void setIdealPeerCount(size_t _n) const;
-
-	/// Start the network subsystem.
-	void startNetwork(unsigned short _listenPort = 30303, std::string const& _remoteHost = std::string(), unsigned short _remotePort = 30303, NodeMode _mode = NodeMode::Full, unsigned _peers = 5, std::string const& _publicIP = std::string(), bool _upnp = true, u256 _networkId = 0);
-	/// Connect to a particular peer.
-	void connect(std::string const& _seedHost, unsigned short _port = 30303);
-	/// Stop the network subsystem.
-	void stopNetwork();
-	/// Is the network subsystem up?
-	bool haveNetwork() { ReadGuard l(x_net); return !!m_net; }
-	/// Save peers
-	bytes savePeers();
-	/// Restore peers
-	void restorePeers(bytesConstRef _saved);
-
 	// Mining stuff:
 
 	/// Check block validity prior to mining.
@@ -243,7 +219,7 @@ public:
 	unsigned miningThreads() const { ReadGuard l(x_miners); return m_miners.size(); }
 	/// Start mining.
 	/// NOT thread-safe - call it & stopMining only from a single thread
-	void startMining() { ensureWorking(); ReadGuard l(x_miners); for (auto& m: m_miners) m.start(); }
+	void startMining() { startWorking(); ReadGuard l(x_miners); for (auto& m: m_miners) m.start(); }
 	/// Stop mining.
 	/// NOT thread-safe
 	void stopMining() { ReadGuard l(x_miners); for (auto& m: m_miners) m.stop(); }
@@ -254,19 +230,22 @@ public:
 	/// Get and clear the mining history.
 	std::list<MineInfo> miningHistory();
 
+	// Debug stuff:
+
+	DownloadMan const* downloadMan() const;
+	bool isSyncing() const;
+	/// Sets the network id.
+	void setNetworkId(u256 _n);
 	/// Clears pending transactions. Just for debug use.
 	void clearPending();
+	/// Kills the blockchain. Just for debug use.
+	void killChain();
 
 private:
-	/// Ensure the worker thread is running. Needed for blockchain maintenance & mining.
-	void ensureWorking();
-
 	/// Do some work. Handles blockchain maintenance and mining.
-	/// @param _justQueue If true will only processing the transaction queues.
-	void work();
+	virtual void doWork();
 
-	/// Do some work on the network.
-	void workNet();
+	virtual void doneWorking();
 
 	/// Overrides for being a mining host.
 	virtual void setupState(State& _s);
@@ -291,26 +270,17 @@ private:
 	State asOf(int _h) const;
 	State asOf(unsigned _h) const;
 
-	std::string m_clientVersion;			///< Our end-application client's name/version.
 	VersionChecker m_vc;					///< Dummy object to check & update the protocol version.
 	BlockChain m_bc;						///< Maintains block database.
 	TransactionQueue m_tq;					///< Maintains a list of incoming transactions not yet in a block on the blockchain.
 	BlockQueue m_bq;						///< Maintains a list of incoming blocks not yet on the blockchain (to be imported).
-	// TODO: remove in favour of copying m_stateDB as required and thread-safing/copying State. Have a good think about what state objects there should be. Probably want 4 (pre, post, mining, user-visible).
+
 	mutable boost::shared_mutex x_stateDB;	///< Lock on the state DB, effectively a lock on m_postMine.
 	OverlayDB m_stateDB;					///< Acts as the central point for the state database, so multiple States can share it.
 	State m_preMine;						///< The present state of the client.
 	State m_postMine;						///< The state of the client which we're mining (i.e. it'll have all the rewards added).
 
-	std::unique_ptr<std::thread> m_workNet;	///< The network thread.
-	std::atomic<ClientWorkState> m_workNetState;
-	mutable boost::shared_mutex x_net;		///< Lock for the network existance.
-	std::unique_ptr<p2p::Host> m_net;		///< Should run in background and send us events when blocks found and allow us to send blocks as required.
-
-	std::weak_ptr<EthereumHost> m_extHost;	///< Our Ethereum Host. Don't do anything if we can't lock.
-
-	std::unique_ptr<std::thread> m_work;	///< The work thread.
-	std::atomic<ClientWorkState> m_workState;
+	std::weak_ptr<EthereumHost> m_host;		///< Our Ethereum Host. Don't do anything if we can't lock.
 
 	std::vector<Miner> m_miners;
 	mutable boost::shared_mutex x_miners;
diff --git a/libethereum/CommonNet.h b/libethereum/CommonNet.h
index 3bb45b55d..c53b644e4 100644
--- a/libethereum/CommonNet.h
+++ b/libethereum/CommonNet.h
@@ -33,11 +33,17 @@ namespace dev
 namespace eth
 {
 
+#if ETH_DEBUG
+static const unsigned c_maxHashes = 64;		///< Maximum number of hashes BlockHashes will ever send.
+static const unsigned c_maxHashesAsk = 64;		///< Maximum number of hashes GetBlockHashes will ever ask for.
+static const unsigned c_maxBlocks = 32;		///< Maximum number of blocks Blocks will ever send.
+static const unsigned c_maxBlocksAsk = 32;		///< Maximum number of blocks we ask to receive in Blocks (when using GetChain).
+#else
 static const unsigned c_maxHashes = 256;		///< Maximum number of hashes BlockHashes will ever send.
 static const unsigned c_maxHashesAsk = 256;		///< Maximum number of hashes GetBlockHashes will ever ask for.
 static const unsigned c_maxBlocks = 128;		///< Maximum number of blocks Blocks will ever send.
 static const unsigned c_maxBlocksAsk = 128;		///< Maximum number of blocks we ask to receive in Blocks (when using GetChain).
-
+#endif
 class OverlayDB;
 class BlockChain;
 class TransactionQueue;
@@ -55,5 +61,14 @@ enum EthereumPacket
 	BlocksPacket,
 };
 
+enum class Grabbing
+{
+	State,
+	Hashes,
+	Chain,
+	ChainHelper,
+	Nothing
+};
+
 }
 }
diff --git a/libethereum/DownloadMan.cpp b/libethereum/DownloadMan.cpp
new file mode 100644
index 000000000..09a3bcc00
--- /dev/null
+++ b/libethereum/DownloadMan.cpp
@@ -0,0 +1,75 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file DownloadMan.cpp
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#include "DownloadMan.h"
+using namespace std;
+using namespace dev;
+using namespace dev::eth;
+
+DownloadSub::DownloadSub(DownloadMan& _man): m_man(&_man)
+{
+	WriteGuard l(m_man->x_subs);
+	m_man->m_subs.insert(this);
+}
+
+DownloadSub::~DownloadSub()
+{
+	if (m_man)
+	{
+		WriteGuard l(m_man->x_subs);
+		m_man->m_subs.erase(this);
+	}
+}
+
+h256Set DownloadSub::nextFetch(unsigned _n)
+{
+	Guard l(m_fetch);
+
+	if (m_remaining.size())
+		return m_remaining;
+
+	m_asked.clear();
+	m_indices.clear();
+	m_remaining.clear();
+
+	if (!m_man)
+		return h256Set();
+
+	m_asked = (~(m_man->taken() + m_attempted)).lowest(_n);
+	if (m_asked.empty())
+		m_asked = (~(m_man->taken(true) + m_attempted)).lowest(_n);
+	m_attempted += m_asked;
+	for (auto i: m_asked)
+	{
+		auto x = m_man->m_chain[i];
+		m_remaining.insert(x);
+		m_indices[x] = i;
+	}
+	return m_remaining;
+}
+
+void DownloadSub::noteBlock(h256 _hash)
+{
+	Guard l(m_fetch);
+	if (m_man && m_indices.count(_hash))
+		m_man->m_blocksGot += m_indices[_hash];
+	m_remaining.erase(_hash);
+}
diff --git a/libethereum/DownloadMan.h b/libethereum/DownloadMan.h
new file mode 100644
index 000000000..e67076d5a
--- /dev/null
+++ b/libethereum/DownloadMan.h
@@ -0,0 +1,136 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file DownloadMan.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#pragma once
+
+#include <map>
+#include <vector>
+#include <set>
+#include <libdevcore/Guards.h>
+#include <libdevcore/Worker.h>
+#include <libdevcore/RangeMask.h>
+#include <libdevcore/FixedHash.h>
+
+namespace dev
+{
+
+namespace eth
+{
+
+class DownloadMan;
+
+class DownloadSub
+{
+	friend class DownloadMan;
+
+public:
+	DownloadSub(DownloadMan& _man);
+	~DownloadSub();
+
+	/// Finished last fetch - grab the next bunch of block hashes to download.
+	h256Set nextFetch(unsigned _n);
+
+	/// Note that we've received a particular block.
+	void noteBlock(h256 _hash);
+
+	/// Nothing doing here.
+	void doneFetch() { resetFetch(); }
+
+	RangeMask<unsigned> const& asked() const { return m_asked; }
+	RangeMask<unsigned> const& attemped() const { return m_attempted; }
+
+private:
+	void resetFetch()		// Called by DownloadMan when we need to reset the download.
+	{
+		Guard l(m_fetch);
+		m_remaining.clear();
+		m_indices.clear();
+		m_asked.clear();
+		m_attempted.clear();
+	}
+
+	DownloadMan* m_man = nullptr;
+
+	Mutex m_fetch;
+	h256Set m_remaining;
+	std::map<h256, unsigned> m_indices;
+	RangeMask<unsigned> m_asked;
+	RangeMask<unsigned> m_attempted;
+};
+
+class DownloadMan
+{
+	friend class DownloadSub;
+
+public:
+	~DownloadMan()
+	{
+		for (auto i: m_subs)
+			i->m_man = nullptr;
+	}
+
+	void resetToChain(h256s const& _chain)
+	{
+		{
+			ReadGuard l(x_subs);
+			for (auto i: m_subs)
+				i->resetFetch();
+		}
+		m_chain.clear();
+		m_chain.reserve(_chain.size());
+		for (auto i = _chain.rbegin(); i != _chain.rend(); ++i)
+			m_chain.push_back(*i);
+		m_blocksGot = RangeMask<unsigned>(0, m_chain.size());
+	}
+
+	RangeMask<unsigned> taken(bool _desperate = false) const
+	{
+		auto ret = m_blocksGot;
+		if (!_desperate)
+		{
+			ReadGuard l(x_subs);
+			for (auto i: m_subs)
+				ret += i->m_asked;
+		}
+		return ret;
+	}
+
+	bool isComplete() const
+	{
+		return m_blocksGot.full();
+	}
+
+	h256s chain() const { return m_chain; }
+	void foreachSub(std::function<void(DownloadSub const&)> const& _f) const { ReadGuard l(x_subs); for(auto i: m_subs) _f(*i); }
+	unsigned subCount() const { ReadGuard l(x_subs); return m_subs.size(); }
+	RangeMask<unsigned> blocksGot() const { return m_blocksGot; }
+
+private:
+	h256s m_chain;
+	RangeMask<unsigned> m_blocksGot;
+
+	mutable SharedMutex x_subs;
+	std::set<DownloadSub*> m_subs;
+};
+
+}
+
+}
diff --git a/libethereum/EthereumHost.cpp b/libethereum/EthereumHost.cpp
index 7d3bd9a92..f9fe45eb0 100644
--- a/libethereum/EthereumHost.cpp
+++ b/libethereum/EthereumHost.cpp
@@ -15,9 +15,7 @@
 	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 */
 /** @file EthereumHost.cpp
- * @authors:
- *   Gav Wood <i@gavwood.com>
- *   Eric Lombrozo <elombrozo@gmail.com>
+ * @author Gav Wood <i@gavwood.com>
  * @date 2014
  */
 
@@ -34,16 +32,21 @@
 #include "TransactionQueue.h"
 #include "BlockQueue.h"
 #include "EthereumPeer.h"
+#include "DownloadMan.h"
 using namespace std;
 using namespace dev;
 using namespace dev::eth;
 using namespace p2p;
 
-EthereumHost::EthereumHost(BlockChain const& _ch, u256 _networkId):
+EthereumHost::EthereumHost(BlockChain const& _ch, TransactionQueue& _tq, BlockQueue& _bq, u256 _networkId):
 	HostCapability<EthereumPeer>(),
-	m_chain		(&_ch),
+	Worker		("ethsync"),
+	m_chain		(_ch),
+	m_tq		(_tq),
+	m_bq		(_bq),
 	m_networkId	(_networkId)
 {
+	m_latestBlockSent = _ch.currentHash();
 }
 
 EthereumHost::~EthereumHost()
@@ -52,36 +55,12 @@ EthereumHost::~EthereumHost()
 		i->cap<EthereumPeer>()->giveUpOnFetch();
 }
 
-h256Set EthereumHost::neededBlocks(h256Set const& _exclude)
-{
-	Guard l(x_blocksNeeded);
-	h256Set ret;
-	if (m_blocksNeeded.size())
-	{
-		int s = m_blocksNeeded.size() - 1;
-		for (; ret.size() < c_maxBlocksAsk && s < (int)m_blocksNeeded.size() && s >= 0; --s)
-			if (!_exclude.count(m_blocksNeeded[s]))
-			{
-				auto it = m_blocksNeeded.begin() + s;
-				ret.insert(*it);
-				m_blocksOnWay.insert(*it);
-				m_blocksNeeded.erase(it);
-			}
-	}
-	if (!ret.size())
-		for (auto i = m_blocksOnWay.begin(); ret.size() < c_maxBlocksAsk && i != m_blocksOnWay.end() && !_exclude.count(*i); ++i)
-			ret.insert(*i);
-
-	clog(NetMessageSummary) << "Asking for" << ret.size() << "blocks that we don't yet have." << m_blocksNeeded.size() << "blocks still needed," << m_blocksOnWay.size() << "blocks on way.";
-	return ret;
-}
-
 bool EthereumHost::ensureInitialised(TransactionQueue& _tq)
 {
-	if (m_latestBlockSent == h256())
+	if (!m_latestBlockSent)
 	{
 		// First time - just initialise.
-		m_latestBlockSent = m_chain->currentHash();
+		m_latestBlockSent = m_chain.currentHash();
 		clog(NetNote) << "Initialising: latest=" << m_latestBlockSent.abridged();
 
 		for (auto const& i: _tq.transactions())
@@ -91,25 +70,98 @@ bool EthereumHost::ensureInitialised(TransactionQueue& _tq)
 	return false;
 }
 
-void EthereumHost::noteDoneBlocks()
+void EthereumHost::noteHavePeerState(EthereumPeer* _who)
+{
+	clog(NetAllDetail) << "Have peer state.";
+
+	// if already downloading hash-chain, ignore.
+	if (m_grabbing != Grabbing::Nothing)
+	{
+		clog(NetAllDetail) << "Already downloading chain. Just set to help out.";
+		_who->ensureGettingChain();
+		return;
+	}
+
+	// otherwise check to see if we should be downloading...
+	_who->tryGrabbingHashChain();
+}
+
+void EthereumHost::updateGrabbing(Grabbing _g)
+{
+	m_grabbing = _g;
+	if (_g == Grabbing::Nothing)
+		readyForSync();
+	else if (_g == Grabbing::Chain)
+		for (auto j: peers())
+			j->cap<EthereumPeer>()->ensureGettingChain();
+}
+
+void EthereumHost::noteHaveChain(EthereumPeer* _from)
+{
+	auto td = _from->m_totalDifficulty;
+
+	if (_from->m_neededBlocks.empty())
+	{
+		_from->m_grabbing = Grabbing::Nothing;
+		updateGrabbing(Grabbing::Nothing);
+		return;
+	}
+
+	clog(NetNote) << "Hash-chain COMPLETE:" << _from->m_totalDifficulty << "vs" << m_chain.details().totalDifficulty << ";" << _from->m_neededBlocks.size() << " blocks, ends" << _from->m_neededBlocks.back().abridged();
+
+	if (td < m_chain.details().totalDifficulty || (td == m_chain.details().totalDifficulty && m_chain.currentHash() == _from->m_latestHash))
+	{
+		clog(NetNote) << "Difficulty of hashchain not HIGHER. Ignoring.";
+		_from->m_grabbing = Grabbing::Nothing;
+		updateGrabbing(Grabbing::Nothing);
+		return;
+	}
+
+	clog(NetNote) << "Difficulty of hashchain HIGHER. Replacing fetch queue [latest now" << _from->m_latestHash.abridged() << ", was" << m_latestBlockSent.abridged() << "]";
+
+	// Looks like it's the best yet for total difficulty. Set to download.
+	m_man.resetToChain(_from->m_neededBlocks);
+	m_latestBlockSent = _from->m_latestHash;
+
+	_from->m_grabbing = Grabbing::Chain;
+	updateGrabbing(Grabbing::Chain);
+}
+
+void EthereumHost::readyForSync()
+{
+	// start grabbing next hash chain if there is one.
+	for (auto j: peers())
+	{
+		j->cap<EthereumPeer>()->tryGrabbingHashChain();
+		if (j->cap<EthereumPeer>()->m_grabbing == Grabbing::Hashes)
+		{
+			m_grabbing = Grabbing::Hashes;
+			return;
+		}
+	}
+	clog(NetNote) << "No more peers to sync with.";
+}
+
+void EthereumHost::noteDoneBlocks(EthereumPeer* _who)
 {
-	clog(NetNote) << "Peer given up on blocks fetch.";
-	if (m_blocksOnWay.empty())
+	if (m_man.isComplete())
+	{
+		// Done our chain-get.
+		clog(NetNote) << "Chain download complete.";
+		updateGrabbing(Grabbing::Nothing);
+	}
+	if (_who->m_grabbing == Grabbing::Chain)
 	{
 		// Done our chain-get.
-		if (m_blocksNeeded.size())
-			clog(NetNote) << "No more blocks coming. Missing" << m_blocksNeeded.size() << "blocks.";
-		else
-			clog(NetNote) << "No more blocks to get.";
-		m_latestBlockSent = m_chain->currentHash();
+		clog(NetNote) << "Chain download failed. Peer with blocks didn't have them all. This peer is bad and should be punished.";
+		// TODO: note that peer is BADBADBAD!
+		updateGrabbing(Grabbing::Nothing);
 	}
 }
 
 bool EthereumHost::noteBlock(h256 _hash, bytesConstRef _data)
 {
-	Guard l(x_blocksNeeded);
-	m_blocksOnWay.erase(_hash);
-	if (!m_chain->details(_hash))
+	if (!m_chain.details(_hash))
 	{
 		lock_guard<recursive_mutex> l(m_incomingLock);
 		m_incomingBlocks.push_back(_data.toBytes());
@@ -118,81 +170,96 @@ bool EthereumHost::noteBlock(h256 _hash, bytesConstRef _data)
 	return false;
 }
 
-bool EthereumHost::sync(TransactionQueue& _tq, BlockQueue& _bq)
+void EthereumHost::doWork()
 {
-	bool netChange = ensureInitialised(_tq);
-	auto h = m_chain->currentHash();
-	maintainTransactions(_tq, h);
-	maintainBlocks(_bq, h);
-	return netChange;
+	bool netChange = ensureInitialised(m_tq);
+	auto h = m_chain.currentHash();
+	maintainTransactions(m_tq, h);
+	maintainBlocks(m_bq, h);
+//	return netChange;
+	// TODO: Figure out what to do with netChange.
+	(void)netChange;
 }
 
 void EthereumHost::maintainTransactions(TransactionQueue& _tq, h256 _currentHash)
 {
-	bool resendAll = (_currentHash != m_latestBlockSent);
-
-	for (auto it = m_incomingTransactions.begin(); it != m_incomingTransactions.end(); ++it)
-		if (_tq.import(&*it))
-		{}//ret = true;		// just putting a transaction in the queue isn't enough to change the state - it might have an invalid nonce...
-		else
-			m_transactionsSent.insert(sha3(*it));	// if we already had the transaction, then don't bother sending it on.
-	m_incomingTransactions.clear();
+	bool resendAll = (m_grabbing == Grabbing::Nothing && m_chain.isKnown(m_latestBlockSent) && _currentHash != m_latestBlockSent);
+	{
+		lock_guard<recursive_mutex> l(m_incomingLock);
+		for (auto it = m_incomingTransactions.begin(); it != m_incomingTransactions.end(); ++it)
+			if (_tq.import(&*it))
+			{}//ret = true;		// just putting a transaction in the queue isn't enough to change the state - it might have an invalid nonce...
+			else
+				m_transactionsSent.insert(sha3(*it));	// if we already had the transaction, then don't bother sending it on.
+		m_incomingTransactions.clear();
+	}
 
 	// Send any new transactions.
 	for (auto const& p: peers())
 	{
 		auto ep = p->cap<EthereumPeer>();
-		bytes b;
-		unsigned n = 0;
-		for (auto const& i: _tq.transactions())
-			if ((!m_transactionsSent.count(i.first) && !ep->m_knownTransactions.count(i.first)) || ep->m_requireTransactions || resendAll)
+		if (ep)
+		{
+			bytes b;
+			unsigned n = 0;
+			for (auto const& i: _tq.transactions())
+				if ((!m_transactionsSent.count(i.first) && !ep->m_knownTransactions.count(i.first)) || ep->m_requireTransactions || resendAll)
+				{
+					b += i.second;
+					++n;
+					m_transactionsSent.insert(i.first);
+				}
+			ep->clearKnownTransactions();
+			
+			if (n)
 			{
-				b += i.second;
-				++n;
-				m_transactionsSent.insert(i.first);
+				RLPStream ts;
+				EthereumPeer::prep(ts);
+				ts.appendList(n + 1) << TransactionsPacket;
+				ts.appendRaw(b, n).swapOut(b);
+				seal(b);
+				ep->send(&b);
 			}
-		if (n)
-		{
-			RLPStream ts;
-			EthereumPeer::prep(ts);
-			ts.appendList(n + 1) << TransactionsPacket;
-			ts.appendRaw(b, n).swapOut(b);
-			seal(b);
-			ep->send(&b);
+			ep->m_requireTransactions = false;
 		}
-		ep->m_knownTransactions.clear();
-		ep->m_requireTransactions = false;
 	}
 }
 
+void EthereumHost::reset()
+{
+	m_grabbing = Grabbing::Nothing;
+
+	m_man.resetToChain(h256s());
+
+	m_incomingTransactions.clear();
+	m_incomingBlocks.clear();
+
+	m_latestBlockSent = h256();
+	m_transactionsSent.clear();
+}
+
 void EthereumHost::maintainBlocks(BlockQueue& _bq, h256 _currentHash)
 {
 	// Import new blocks
 	{
 		lock_guard<recursive_mutex> l(m_incomingLock);
 		for (auto it = m_incomingBlocks.rbegin(); it != m_incomingBlocks.rend(); ++it)
-			if (_bq.import(&*it, *m_chain))
+			if (_bq.import(&*it, m_chain))
 			{}
 			else{} // TODO: don't forward it.
 		m_incomingBlocks.clear();
 	}
 
-	// If we've finished our initial sync...
-	{
-		Guard l(x_blocksNeeded);
-		if (m_blocksOnWay.size())
-			return;
-	}
-	// ...send any new blocks.
-	if (m_latestBlockSent != _currentHash)
+	// If we've finished our initial sync send any new blocks.
+	if (m_grabbing == Grabbing::Nothing && m_chain.isKnown(m_latestBlockSent) && m_chain.details(m_latestBlockSent).totalDifficulty < m_chain.details(_currentHash).totalDifficulty)
 	{
 		RLPStream ts;
 		EthereumPeer::prep(ts);
 		bytes bs;
 		unsigned c = 0;
-		for (auto h: m_chain->treeRoute(m_latestBlockSent, _currentHash, nullptr, false, true))
+		for (auto h: m_chain.treeRoute(m_latestBlockSent, _currentHash, nullptr, false, true))
 		{
-			bs += m_chain->block(h);
+			bs += m_chain.block(h);
 			++c;
 		}
 		clog(NetMessageSummary) << "Sending" << c << "new blocks (current is" << _currentHash << ", was" << m_latestBlockSent << ")";
@@ -204,6 +271,7 @@ void EthereumHost::maintainBlocks(BlockQueue& _bq, h256 _currentHash)
 		for (auto j: peers())
 		{
 			auto p = j->cap<EthereumPeer>();
+			Guard l(p->x_knownBlocks);
 			if (!p->m_knownBlocks.count(_currentHash))
 				p->send(&b);
 			p->m_knownBlocks.clear();
@@ -211,32 +279,3 @@ void EthereumHost::maintainBlocks(BlockQueue& _bq, h256 _currentHash)
 		m_latestBlockSent = _currentHash;
 	}
 }
-
-void EthereumHost::noteHaveChain(EthereumPeer* _from)
-{
-	auto td = _from->m_totalDifficulty;
-
-	if (_from->m_neededBlocks.empty())
-		return;
-
-	clog(NetNote) << "Hash-chain COMPLETE:" << _from->m_totalDifficulty << "vs" << m_chain->details().totalDifficulty << "," << m_totalDifficultyOfNeeded << ";" << _from->m_neededBlocks.size() << " blocks, ends" << _from->m_neededBlocks.back().abridged();
-
-	if ((m_totalDifficultyOfNeeded && td < m_totalDifficultyOfNeeded) || td < m_chain->details().totalDifficulty)
-	{
-		clog(NetNote) << "Difficulty of hashchain LOWER. Ignoring.";
-		return;
-	}
-
-	clog(NetNote) << "Difficulty of hashchain HIGHER. Replacing fetch queue.";
-
-	// Looks like it's the best yet for total difficulty. Set to download.
-	{
-		Guard l(x_blocksNeeded);
-		m_blocksNeeded = _from->m_neededBlocks;
-		m_blocksOnWay.clear();
-		m_totalDifficultyOfNeeded = td;
-	}
-
-	for (auto j: peers())
-		j->cap<EthereumPeer>()->restartGettingChain();
-}
diff --git a/libethereum/EthereumHost.h b/libethereum/EthereumHost.h
index bd0a5d0bc..07ef92513 100644
--- a/libethereum/EthereumHost.h
+++ b/libethereum/EthereumHost.h
@@ -29,10 +29,13 @@
 #include <utility>
 #include <thread>
 #include <libdevcore/Guards.h>
+#include <libdevcore/Worker.h>
+#include <libdevcore/RangeMask.h>
 #include <libethcore/CommonEth.h>
 #include <libp2p/Common.h>
 #include "CommonNet.h"
 #include "EthereumPeer.h"
+#include "DownloadMan.h"
 
 namespace dev
 {
@@ -49,31 +52,41 @@ class BlockQueue;
  * @brief The EthereumHost class
  * @warning None of this is thread-safe. You have been warned.
  */
-class EthereumHost: public p2p::HostCapability<EthereumPeer>
+class EthereumHost: public p2p::HostCapability<EthereumPeer>, Worker
 {
 	friend class EthereumPeer;
 
 public:
 	/// Start server, but don't listen.
-	EthereumHost(BlockChain const& _ch, u256 _networkId);
+	EthereumHost(BlockChain const& _ch, TransactionQueue& _tq, BlockQueue& _bq, u256 _networkId);
 
 	/// Will block on network process events.
 	virtual ~EthereumHost();
 
 	unsigned protocolVersion() const { return c_protocolVersion; }
 	u256 networkId() const { return m_networkId; }
+	void setNetworkId(u256 _n) { m_networkId = _n; }
 
-	/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
-	bool sync(TransactionQueue&, BlockQueue& _bc);
+	void reset();
+
+	DownloadMan const& downloadMan() const { return m_man; }
+	bool isSyncing() const { return m_grabbing == Grabbing::Chain; }
 
 private:
+	void noteHavePeerState(EthereumPeer* _who);
 	/// Session wants to pass us a block that we might not have.
 	/// @returns true if we didn't have it.
 	bool noteBlock(h256 _hash, bytesConstRef _data);
 	/// Session has finished getting the chain of hashes.
 	void noteHaveChain(EthereumPeer* _who);
 	/// Called when the peer can no longer provide us with any needed blocks.
-	void noteDoneBlocks();
+	void noteDoneBlocks(EthereumPeer* _who);
+
+	/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
+	void doWork();
+
+	/// Called by peer to add incoming transactions.
+	void addIncomingTransaction(bytes const& _bytes) { std::lock_guard<std::recursive_mutex> l(m_incomingLock); m_incomingTransactions.push_back(_bytes); }
 
 	void maintainTransactions(TransactionQueue& _tq, h256 _currentBlock);
 	void maintainBlocks(BlockQueue& _bq, h256 _currentBlock);
@@ -84,26 +97,33 @@ private:
 	h256Set neededBlocks(h256Set const& _exclude);
 
 	///	Check to see if the network peer-state initialisation has happened.
-	virtual bool isInitialised() const { return m_latestBlockSent; }
+	bool isInitialised() const { return m_latestBlockSent; }
 
 	/// Initialises the network peer-state, doing the stuff that needs to be once-only. @returns true if it really was first.
 	bool ensureInitialised(TransactionQueue& _tq);
 
-	BlockChain const* m_chain = nullptr;
+	virtual void onStarting() { startWorking(); }
+	virtual void onStopping() { stopWorking(); }
+
+	void readyForSync();
+	void updateGrabbing(Grabbing _g);
+
+	BlockChain const& m_chain;
+	TransactionQueue& m_tq;					///< Maintains a list of incoming transactions not yet in a block on the blockchain.
+	BlockQueue& m_bq;						///< Maintains a list of incoming blocks not yet on the blockchain (to be imported).
 
 	u256 m_networkId;
 
+	Grabbing m_grabbing = Grabbing::Nothing;	// TODO: needs to be thread-safe & switch to just having a peer id.
+
 	mutable std::recursive_mutex m_incomingLock;
 	std::vector<bytes> m_incomingTransactions;
 	std::vector<bytes> m_incomingBlocks;
 
-	mutable std::mutex x_blocksNeeded;
-	u256 m_totalDifficultyOfNeeded;
-	h256s m_blocksNeeded;
-	h256Set m_blocksOnWay;
+	DownloadMan m_man;
 
 	h256 m_latestBlockSent;
-	std::set<h256> m_transactionsSent;
+	h256Set m_transactionsSent;
 };
 
 }
diff --git a/libethereum/EthereumPeer.cpp b/libethereum/EthereumPeer.cpp
index 9e72f8429..7608afc2a 100644
--- a/libethereum/EthereumPeer.cpp
+++ b/libethereum/EthereumPeer.cpp
@@ -35,7 +35,8 @@ using namespace p2p;
 #define clogS(X) dev::LogOutputStream<X, true>(false) << "| " << std::setw(2) << session()->socketId() << "] "
 
 EthereumPeer::EthereumPeer(Session* _s, HostCapabilityFace* _h):
-	Capability(_s, _h)
+	Capability(_s, _h),
+	m_sub(host()->m_man)
 {
 	sendStatus();
 }
@@ -57,15 +58,15 @@ void EthereumPeer::sendStatus()
 	s.appendList(6) << StatusPacket
 					<< host()->protocolVersion()
 					<< host()->networkId()
-					<< host()->m_chain->details().totalDifficulty
-					<< host()->m_chain->currentHash()
-					<< host()->m_chain->genesisHash();
+					<< host()->m_chain.details().totalDifficulty
+					<< host()->m_chain.currentHash()
+					<< host()->m_chain.genesisHash();
 	sealAndSend(s);
 }
 
 void EthereumPeer::startInitialSync()
 {
-	// Grab trsansactions off them.
+	// Grab transactions off them.
 	{
 		RLPStream s;
 		prep(s).appendList(1);
@@ -73,16 +74,36 @@ void EthereumPeer::startInitialSync()
 		sealAndSend(s);
 	}
 
-	h256 c = host()->m_chain->currentHash();
-	unsigned n = host()->m_chain->number();
-	u256 td = max(host()->m_chain->details().totalDifficulty, host()->m_totalDifficultyOfNeeded);
+	host()->noteHavePeerState(this);
+}
 
-	clogS(NetAllDetail) << "Initial sync. Latest:" << c.abridged() << ", number:" << n << ", TD: max(" << host()->m_chain->details().totalDifficulty << "," << host()->m_totalDifficultyOfNeeded << ") versus " << m_totalDifficulty;
-	if (td > m_totalDifficulty)
+void EthereumPeer::tryGrabbingHashChain()
+{
+	// if already done this, then ignore.
+	if (m_grabbing != Grabbing::State)
+	{
+		clogS(NetAllDetail) << "Already synced with this peer.";
+		return;
+	}
+
+	h256 c = host()->m_chain.currentHash();
+	unsigned n = host()->m_chain.number();
+	u256 td = host()->m_chain.details().totalDifficulty;
+
+	clogS(NetAllDetail) << "Attempt chain-grab? Latest:" << c.abridged() << ", number:" << n << ", TD:" << td << " versus " << m_totalDifficulty;
+	if (td >= m_totalDifficulty)
+	{
+		clogS(NetAllDetail) << "No. Our chain is better.";
+		m_grabbing = Grabbing::Nothing;
 		return;	// All good - we have the better chain.
+	}
 
 	// Our chain isn't better - grab theirs.
 	{
+		clogS(NetAllDetail) << "Yes. Their chain is better.";
+
+		host()->updateGrabbing(Grabbing::Hashes);
+		m_grabbing = Grabbing::Hashes;
 		RLPStream s;
 		prep(s).appendList(3);
 		s << GetBlockHashesPacket << m_latestHash << c_maxHashesAsk;
@@ -93,19 +114,17 @@ void EthereumPeer::startInitialSync()
 
 void EthereumPeer::giveUpOnFetch()
 {
-	clogS(NetNote) << "GIVE UP FETCH; can't get" << toString(m_askedBlocks);
-	if (m_askedBlocks.size())
+	clogS(NetNote) << "GIVE UP FETCH";
+
+	// a bit overkill given that the other nodes may yet have the needed blocks, but better to be safe than sorry.
+	if (m_grabbing == Grabbing::Chain || m_grabbing == Grabbing::ChainHelper)
 	{
-		Guard l (host()->x_blocksNeeded);
-		host()->m_blocksNeeded.reserve(host()->m_blocksNeeded.size() + m_askedBlocks.size());
-		for (auto i: m_askedBlocks)
-		{
-			m_failedBlocks.insert(i);
-			host()->m_blocksOnWay.erase(i);
-			host()->m_blocksNeeded.push_back(i);
-		}
-		m_askedBlocks.clear();
+		host()->noteDoneBlocks(this);
+		m_grabbing = Grabbing::Nothing;
 	}
+
+	m_sub.doneFetch();
+	// NOTE: need to notify of giving up on chain-hashes, too, altering state as necessary.
 }
 
 bool EthereumPeer::interpret(RLP const& _r)
@@ -122,7 +141,7 @@ bool EthereumPeer::interpret(RLP const& _r)
 
 		clogS(NetMessageSummary) << "Status:" << m_protocolVersion << "/" << m_networkId << "/" << genesisHash.abridged() << ", TD:" << m_totalDifficulty << "=" << m_latestHash.abridged();
 
-		if (genesisHash != host()->m_chain->genesisHash())
+		if (genesisHash != host()->m_chain.genesisHash())
 			disable("Invalid genesis hash");
 		if (m_protocolVersion != host()->protocolVersion())
 			disable("Invalid protocol version.");
@@ -138,33 +157,44 @@ bool EthereumPeer::interpret(RLP const& _r)
 		break;
 	}
 	case TransactionsPacket:
+	{
 		clogS(NetMessageSummary) << "Transactions (" << dec << (_r.itemCount() - 1) << "entries)";
 		addRating(_r.itemCount() - 1);
+		lock_guard<recursive_mutex> l(host()->m_incomingLock);
 		for (unsigned i = 1; i < _r.itemCount(); ++i)
 		{
-			host()->m_incomingTransactions.push_back(_r[i].data().toBytes());
+			host()->addIncomingTransaction(_r[i].data().toBytes());
+			
+			lock_guard<mutex> l(x_knownTransactions);
 			m_knownTransactions.insert(sha3(_r[i].data()));
 		}
 		break;
+	}
 	case GetBlockHashesPacket:
 	{
 		h256 later = _r[1].toHash<h256>();
 		unsigned limit = _r[2].toInt<unsigned>();
 		clogS(NetMessageSummary) << "GetBlockHashes (" << limit << "entries," << later.abridged() << ")";
 
-		unsigned c = min<unsigned>(host()->m_chain->number(later), limit);
+		unsigned c = min<unsigned>(max<unsigned>(1, host()->m_chain.number(later)) - 1, limit);
 
 		RLPStream s;
 		prep(s).appendList(1 + c).append(BlockHashesPacket);
-		h256 p = host()->m_chain->details(later).parent;
-		for (unsigned i = 0; i < c; ++i, p = host()->m_chain->details(p).parent)
+		h256 p = host()->m_chain.details(later).parent;
+		for (unsigned i = 0; i < c; ++i, p = host()->m_chain.details(p).parent)
 			s << p;
 		sealAndSend(s);
 		break;
 	}
 	case BlockHashesPacket:
 	{
-		clogS(NetMessageSummary) << "BlockHashes (" << dec << (_r.itemCount() - 1) << "entries)";
+		clogS(NetMessageSummary) << "BlockHashes (" << dec << (_r.itemCount() - 1) << "entries)" << (_r.itemCount() - 1 ? "" : ": NoMoreHashes");
+
+		if (m_grabbing != Grabbing::Hashes)
+		{
+			cwarn << "Peer giving us hashes when we didn't ask for them.";
+			break;
+		}
 		if (_r.itemCount() == 1)
 		{
 			host()->noteHaveChain(this);
@@ -173,7 +203,7 @@ bool EthereumPeer::interpret(RLP const& _r)
 		for (unsigned i = 1; i < _r.itemCount(); ++i)
 		{
 			auto h = _r[i].toHash<h256>();
-			if (host()->m_chain->details(h))
+			if (host()->m_chain.details(h))
 			{
 				host()->noteHaveChain(this);
 				return true;
@@ -191,12 +221,12 @@ bool EthereumPeer::interpret(RLP const& _r)
 	case GetBlocksPacket:
 	{
 		clogS(NetMessageSummary) << "GetBlocks (" << dec << (_r.itemCount() - 1) << "entries)";
-		// TODO: return the requested blocks.
+		// return the requested blocks.
 		bytes rlp;
 		unsigned n = 0;
 		for (unsigned i = 1; i < _r.itemCount() && i <= c_maxBlocks; ++i)
 		{
-			auto b = host()->m_chain->block(_r[i].toHash<h256>());
+			auto b = host()->m_chain.block(_r[i].toHash<h256>());
 			if (b.size())
 			{
 				rlp += b;
@@ -209,22 +239,23 @@ bool EthereumPeer::interpret(RLP const& _r)
 	}
 	case BlocksPacket:
 	{
-		clogS(NetMessageSummary) << "Blocks (" << dec << (_r.itemCount() - 1) << "entries)";
+		clogS(NetMessageSummary) << "Blocks (" << dec << (_r.itemCount() - 1) << "entries)" << (_r.itemCount() - 1 ? "" : ": NoMoreBlocks");
 
-		if (_r.itemCount() == 1 && !m_askedBlocksChanged)
+		if (_r.itemCount() == 1)
 		{
 			// Couldn't get any from last batch - probably got to this peer's latest block - just give up.
+			m_sub.doneFetch();
 			giveUpOnFetch();
 		}
-		m_askedBlocksChanged = false;
 
 		unsigned used = 0;
 		for (unsigned i = 1; i < _r.itemCount(); ++i)
 		{
 			auto h = BlockInfo::headerHash(_r[i].data());
+			m_sub.noteBlock(h);
 			if (host()->noteBlock(h, _r[i].data()))
 				used++;
-			m_askedBlocks.erase(h);
+			Guard l(x_knownBlocks);
 			m_knownBlocks.insert(h);
 		}
 		addRating(used);
@@ -236,15 +267,16 @@ bool EthereumPeer::interpret(RLP const& _r)
 			{
 				auto h = BlockInfo::headerHash(_r[i].data());
 				BlockInfo bi(_r[i].data());
-				if (!host()->m_chain->details(bi.parentHash) && !m_knownBlocks.count(bi.parentHash))
+				Guard l(x_knownBlocks);
+				if (!host()->m_chain.details(bi.parentHash) && !m_knownBlocks.count(bi.parentHash))
 				{
 					unknownParents++;
-					clogS(NetAllDetail) << "Unknown parent" << bi.parentHash << "of block" << h;
+					clogS(NetAllDetail) << "Unknown parent" << bi.parentHash.abridged() << "of block" << h.abridged();
 				}
 				else
 				{
 					knownParents++;
-					clogS(NetAllDetail) << "Known parent" << bi.parentHash << "of block" << h;
+					clogS(NetAllDetail) << "Known parent" << bi.parentHash.abridged() << "of block" << h.abridged();
 				}
 			}
 		}
@@ -258,21 +290,9 @@ bool EthereumPeer::interpret(RLP const& _r)
 	return true;
 }
 
-void EthereumPeer::restartGettingChain()
-{
-	if (m_askedBlocks.size())
-	{
-		m_askedBlocksChanged = true;	// So that we continue even if the Ask's reply is empty.
-		m_askedBlocks.clear();			// So that we restart once we get the Ask's reply.
-		m_failedBlocks.clear();
-	}
-	else
-		ensureGettingChain();
-}
-
 void EthereumPeer::ensureGettingChain()
 {
-	if (m_askedBlocks.size())
+	if (m_grabbing == Grabbing::ChainHelper)
 		return;	// Already asked & waiting for some.
 
 	continueGettingChain();
@@ -280,21 +300,20 @@ void EthereumPeer::ensureGettingChain()
 
 void EthereumPeer::continueGettingChain()
 {
-	if (!m_askedBlocks.size())
-		m_askedBlocks = host()->neededBlocks(m_failedBlocks);
+	if (m_grabbing != Grabbing::Chain)
+		m_grabbing = Grabbing::ChainHelper;
 
-	if (m_askedBlocks.size())
+	auto blocks = m_sub.nextFetch(c_maxBlocksAsk);
+
+	if (blocks.size())
 	{
 		RLPStream s;
 		prep(s);
-		s.appendList(m_askedBlocks.size() + 1) << GetBlocksPacket;
-		for (auto i: m_askedBlocks)
+		s.appendList(blocks.size() + 1) << GetBlocksPacket;
+		for (auto const& i: blocks)
 			s << i;
 		sealAndSend(s);
 	}
 	else
-	{
-		clogS(NetMessageSummary) << "No blocks left to get. Peer doesn't seem to have" << m_failedBlocks.size() << "of our needed blocks.";
-		host()->noteDoneBlocks();
-	}
+		giveUpOnFetch();
 }
diff --git a/libethereum/EthereumPeer.h b/libethereum/EthereumPeer.h
index 2e166b1d0..f88a757d8 100644
--- a/libethereum/EthereumPeer.h
+++ b/libethereum/EthereumPeer.h
@@ -27,9 +27,12 @@
 #include <memory>
 #include <utility>
 #include <libdevcore/RLP.h>
+#include <libdevcore/Guards.h>
+#include <libdevcore/RangeMask.h>
 #include <libethcore/CommonEth.h>
 #include <libp2p/Capability.h>
 #include "CommonNet.h"
+#include "DownloadMan.h"
 
 namespace dev
 {
@@ -58,30 +61,34 @@ private:
 	void sendStatus();
 	void startInitialSync();
 
+	void tryGrabbingHashChain();
+
 	/// Ensure that we are waiting for a bunch of blocks from our peer.
 	void ensureGettingChain();
 	/// Ensure that we are waiting for a bunch of blocks from our peer.
 	void continueGettingChain();
-	/// Now getting a different chain so we need to make sure we restart.
-	void restartGettingChain();
 
 	void giveUpOnFetch();
 
+	void clearKnownTransactions() { std::lock_guard<std::mutex> l(x_knownTransactions); m_knownTransactions.clear(); }
+	
 	unsigned m_protocolVersion;
 	u256 m_networkId;
 
+	Grabbing m_grabbing = Grabbing::State;
+
 	h256 m_latestHash;						///< Peer's latest block's hash.
 	u256 m_totalDifficulty;					///< Peer's latest block's total difficulty.
 	h256s m_neededBlocks;					///< The blocks that we should download from this peer.
-	h256Set m_failedBlocks;					///< Blocks that the peer doesn't seem to have.
-
-	h256Set m_askedBlocks;					///< The blocks for which we sent the last GetBlocks for but haven't received a corresponding Blocks.
-	bool m_askedBlocksChanged = true;
 
 	bool m_requireTransactions;
 
+	Mutex x_knownBlocks;
 	std::set<h256> m_knownBlocks;
 	std::set<h256> m_knownTransactions;
+	std::mutex x_knownTransactions;
+
+	DownloadSub m_sub;
 };
 
 }
diff --git a/libethereum/Executive.cpp b/libethereum/Executive.cpp
index e8c1fd1cb..a6b57a05c 100644
--- a/libethereum/Executive.cpp
+++ b/libethereum/Executive.cpp
@@ -187,6 +187,7 @@ bool Executive::go(OnOpFunc const& _onOp)
 		catch (VMException const& _e)
 		{
 			clog(StateChat) << "VM Exception: " << _e.description();
+			m_endGas = m_vm->gas();
 		}
 		catch (Exception const& _e)
 		{
diff --git a/libethereum/Interface.h b/libethereum/Interface.h
index 3fa93a286..a5df3e5b1 100644
--- a/libethereum/Interface.h
+++ b/libethereum/Interface.h
@@ -95,8 +95,13 @@ public:
 	virtual bool peekWatch(unsigned _watchId) const = 0;
 	virtual bool checkWatch(unsigned _watchId) = 0;
 
+	// TODO: Block query API.
+
 	// [EXTRA API]:
 
+	/// @returns The height of the chain.
+	virtual unsigned number() const = 0;
+
 	/// Get a map containing each of the pending transactions.
 	/// @TODO: Remove in favour of transactions().
 	virtual Transactions pending() const = 0;
diff --git a/libethereum/Miner.cpp b/libethereum/Miner.cpp
index c602cedc1..9b651e2c5 100644
--- a/libethereum/Miner.cpp
+++ b/libethereum/Miner.cpp
@@ -27,42 +27,12 @@ using namespace dev;
 using namespace dev::eth;
 
 Miner::Miner(MinerHost* _host, unsigned _id):
-	m_host(_host),
-	m_id(_id)
+	Worker("miner-" + toString(_id)),
+	m_host(_host)
 {
 }
 
-void Miner::start()
-{
-	if (!m_host)
-		return;
-
-	Guard l(x_work);
-	if (!m_work)
-	{
-		m_stop = false;
-		m_work.reset(new thread([&]()
-		{
-			setThreadName(("miner-" + toString(m_id)).c_str());
-			m_miningStatus = Preparing;
-			while (!m_stop)
-				work();
-		}));
-	}
-}
-
-void Miner::stop()
-{
-	Guard l(x_work);
-	if (m_work)
-	{
-		m_stop = true;
-		m_work->join();
-		m_work.reset(nullptr);
-	}
-}
-
-void Miner::work()
+void Miner::doWork()
 {
 	// Do some mining.
 	if (m_miningStatus != Waiting && m_miningStatus != Mined)
diff --git a/libethereum/Miner.h b/libethereum/Miner.h
index 8912b0e2a..763249b7d 100644
--- a/libethereum/Miner.h
+++ b/libethereum/Miner.h
@@ -26,6 +26,7 @@
 #include <list>
 #include <atomic>
 #include <libdevcore/Common.h>
+#include <libdevcore/Worker.h>
 #include <libethcore/CommonEth.h>
 #include "State.h"
 
@@ -74,38 +75,38 @@ public:
  * @threadsafe
  * @todo Signal Miner to restart once with condition variables.
  */
-class Miner
+class Miner: Worker
 {
 public:
 	/// Null constructor.
-	Miner(): m_host(nullptr), m_id(0) {}
+	Miner(): m_host(nullptr) {}
 
 	/// Constructor.
 	Miner(MinerHost* _host, unsigned _id = 0);
 
 	/// Move-constructor.
-	Miner(Miner&& _m) { std::swap(m_host, _m.m_host); std::swap(m_id, _m.m_id); }
+	Miner(Miner&& _m): Worker((Worker&&)_m) { std::swap(m_host, _m.m_host); }
 
 	/// Move-assignment.
-	Miner& operator=(Miner&& _m) { std::swap(m_host, _m.m_host); std::swap(m_id, _m.m_id); return *this; }
+	Miner& operator=(Miner&& _m) { Worker::operator=((Worker&&)_m); std::swap(m_host, _m.m_host); return *this; }
 
 	/// Destructor. Stops miner.
 	~Miner() { stop(); }
 
 	/// Setup its basics.
-	void setup(MinerHost* _host, unsigned _id = 0) { m_host = _host; m_id = _id; }
+	void setup(MinerHost* _host, unsigned _id = 0) { m_host = _host; setName("miner-" + toString(_id)); }
 
 	/// Start mining.
-	void start();
+	void start() { startWorking(); }
 
 	/// Stop mining.
-	void stop();
+	void stop() { stopWorking(); }
 
 	/// Call to notify Miner of a state change.
 	void noteStateChange() { m_miningStatus = Preparing; }
 
 	/// @returns true iff the mining has been start()ed. It may still not be actually mining, depending on the host's turbo() & force().
-	bool isRunning() { return !!m_work; }
+	bool isRunning() { return isWorking(); }
 
 	/// @returns true if mining is complete.
 	bool isComplete() const { return m_miningStatus == Mined; }
@@ -121,14 +122,9 @@ public:
 
 private:
 	/// Do some work on the mining.
-	void work();
+	virtual void doWork();
 
 	MinerHost* m_host = nullptr;			///< Our host.
-	unsigned m_id = 0;						///< Our identity.
-
-	std::mutex x_work;						///< Mutex protecting the creation of the work thread.
-	std::unique_ptr<std::thread> m_work;	///< The work thread.
-	bool m_stop = false;					///< Stop working?
 
 	enum MiningStatus { Waiting, Preparing, Mining, Mined, Stopping, Stopped };
 	MiningStatus m_miningStatus = Waiting;	///< TODO: consider mutex/atomic variable.
diff --git a/libethereum/State.cpp b/libethereum/State.cpp
index 093db299f..a74b6ba18 100644
--- a/libethereum/State.cpp
+++ b/libethereum/State.cpp
@@ -152,10 +152,15 @@ State& State::operator=(State const& _s)
 	m_currentBlock = _s.m_currentBlock;
 	m_ourAddress = _s.m_ourAddress;
 	m_blockReward = _s.m_blockReward;
+	m_lastTx = _s.m_lastTx;
 	paranoia("after state cloning (assignment op)", true);
 	return *this;
 }
 
+State::~State()
+{
+}
+
 struct CachedAddressState
 {
 	CachedAddressState(std::string const& _rlp, AddressState const* _s, OverlayDB const* _o): rS(_rlp), r(rS), s(_s), o(_o) {}
diff --git a/libethereum/State.h b/libethereum/State.h
index 335f27168..fea8e06c7 100644
--- a/libethereum/State.h
+++ b/libethereum/State.h
@@ -90,6 +90,8 @@ public:
 	/// Copy state object.
 	State& operator=(State const& _s);
 
+	~State();
+
 	/// Set the coinbase address for any transactions we do.
 	/// This causes a complete reset of current block.
 	void setAddress(Address _coinbaseAddress) { m_ourAddress = _coinbaseAddress; resetCurrent(); }
diff --git a/libethereum/TransactionQueue.h b/libethereum/TransactionQueue.h
index 154eed9d2..22a420602 100644
--- a/libethereum/TransactionQueue.h
+++ b/libethereum/TransactionQueue.h
@@ -52,6 +52,8 @@ public:
 	void setFuture(std::pair<h256, bytes> const& _t);
 	void noteGood(std::pair<h256, bytes> const& _t);
 
+	void clear() { WriteGuard l(m_lock); m_known.clear(); m_current.clear(); m_unknown.clear(); }
+
 private:
 	mutable boost::shared_mutex m_lock;							///< General lock.
 	std::set<h256> m_known;										///< Hashes of transactions in both sets.
diff --git a/libevm/VM.h b/libevm/VM.h
index e7d218ec6..cbecc3ee7 100644
--- a/libevm/VM.h
+++ b/libevm/VM.h
@@ -41,7 +41,6 @@ class BreakPointHit: public VMException {};
 class BadInstruction: public VMException {};
 class OutOfGas: public VMException {};
 class StackTooSmall: public VMException { public: StackTooSmall(u256 _req, u256 _got): req(_req), got(_got) {} u256 req; u256 got; };
-class OperandOutOfRange: public VMException { public: OperandOutOfRange(u256 _min, u256 _max, u256 _got): mn(_min), mx(_max), got(_got) {} u256 mn; u256 mx; u256 got; };
 
 // Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
 // Currently we just pull out the right (low-order in BE) 160-bits.
@@ -157,7 +156,11 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
 			require(3);
 			newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 3]);
 			break;
-
+		case Instruction::EXTCODECOPY:
+			require(4);
+			newTempSize = memNeed(m_stack[m_stack.size() - 2], m_stack[m_stack.size() - 4]);
+			break;
+			
 		case Instruction::BALANCE:
 			runGas = c_balanceGas;
 			break;
diff --git a/libevmface/Instruction.h b/libevmface/Instruction.h
index 8d4ca989a..6c87b7a76 100644
--- a/libevmface/Instruction.h
+++ b/libevmface/Instruction.h
@@ -32,143 +32,140 @@ namespace dev
 namespace eth
 {
 
-// TODO: Update comments.
-
 /// Virtual machine bytecode instruction.
 enum class Instruction: uint8_t
 {
 	STOP = 0x00,		///< halts execution
-	ADD,
-	MUL,
-	SUB,
-	DIV,
-	SDIV,
-	MOD,
-	SMOD,
-	EXP,
-	NEG,
-	LT,
-	GT,
-	SLT,
-	SGT,
-	EQ,
-	NOT,
-
-	AND = 0x10,
-	OR,
-	XOR,
-	BYTE,
-	ADDMOD,
-	MULMOD,
-
-	SHA3 = 0x20,
-
-	ADDRESS = 0x30,
-	BALANCE,
-	ORIGIN,
-	CALLER,
-	CALLVALUE,
-	CALLDATALOAD,
-	CALLDATASIZE,
-	CALLDATACOPY,
-	CODESIZE,
-	CODECOPY,
-	GASPRICE,
-	EXTCODESIZE,
-	EXTCODECOPY,
-
-	PREVHASH = 0x40,
-	COINBASE,
-	TIMESTAMP,
-	NUMBER,
-	DIFFICULTY,
-	GASLIMIT,
-
-	POP = 0x50,
-	MLOAD = 0x53,
-	MSTORE,
-	MSTORE8,
-	SLOAD,
-	SSTORE,
-	JUMP,
-	JUMPI,
-	PC,
-	MSIZE,
-	GAS,
-
-	PUSH1 = 0x60,
-	PUSH2,
-	PUSH3,
-	PUSH4,
-	PUSH5,
-	PUSH6,
-	PUSH7,
-	PUSH8,
-	PUSH9,
-	PUSH10,
-	PUSH11,
-	PUSH12,
-	PUSH13,
-	PUSH14,
-	PUSH15,
-	PUSH16,
-	PUSH17,
-	PUSH18,
-	PUSH19,
-	PUSH20,
-	PUSH21,
-	PUSH22,
-	PUSH23,
-	PUSH24,
-	PUSH25,
-	PUSH26,
-	PUSH27,
-	PUSH28,
-	PUSH29,
-	PUSH30,
-	PUSH31,
-	PUSH32,
-
-	DUP1 = 0x80,
-	DUP2,
-	DUP3,
-	DUP4,
-	DUP5,
-	DUP6,
-	DUP7,
-	DUP8,
-	DUP9,
-	DUP10,
-	DUP11,
-	DUP12,
-	DUP13,
-	DUP14,
-	DUP15,
-	DUP16,
-
-	SWAP1 = 0x90,
-	SWAP2,
-	SWAP3,
-	SWAP4,
-	SWAP5,
-	SWAP6,
-	SWAP7,
-	SWAP8,
-	SWAP9,
-	SWAP10,
-	SWAP11,
-	SWAP12,
-	SWAP13,
-	SWAP14,
-	SWAP15,
-	SWAP16,
-
-	CREATE = 0xf0,
-	CALL,
-	RETURN,
-	POST,
+	ADD,				///< addition operation
+	MUL,				///< mulitplication operation
+	SUB,				///< subtraction operation
+	DIV,				///< integer division operation
+	SDIV,				///< signed integer division operation
+	MOD,				///< modulo remainder operation
+	SMOD,				///< signed modulo remainder operation
+	EXP,				///< exponential operation
+	NEG,				///< negation operation
+	LT,					///< less-than comparision
+	GT,					///< greater-than comparision
+	SLT,				///< signed less-than comparision
+	SGT,				///< signed greater-than comparision
+	EQ,					///< equality comparision
+	NOT,				///< simple not operator
+
+	AND = 0x10,			///< bitwise AND operation
+	OR,					///< bitwise OR operation
+	XOR,				///< bitwise XOR operation
+	BYTE,				///< retrieve single byte from word
+	ADDMOD,				///< unsigned modular addition
+	MULMOD,				///< unsigned modular multiplication
+	SHA3 = 0x20,		///< compute SHA3-256 hash
+
+	ADDRESS = 0x30,		///< get address of currently executing account
+	BALANCE,			///< get balance of the given account
+	ORIGIN,				///< get execution origination address
+	CALLER,				///< get caller address
+	CALLVALUE,			///< get deposited value by the instruction/transaction responsible for this execution
+	CALLDATALOAD,		///< get input data of current environment
+	CALLDATASIZE,		///< get size of input data in current environment
+	CALLDATACOPY,		///< copy input data in current environment to memory
+	CODESIZE,			///< get size of code running in current environment
+	CODECOPY,			///< copy code running in current environment to memory
+	GASPRICE,			///< get price of gas in current environment
+	EXTCODESIZE,		///< get external code size (from another contract)
+	EXTCODECOPY,		///< copy external code (from another contract)
+
+	PREVHASH = 0x40,	///< get hash of most recent complete block
+	COINBASE,			///< get the block's coinbase address
+	TIMESTAMP,			///< get the block's timestamp
+	NUMBER,				///< get the block's number
+	DIFFICULTY,			///< get the block's difficulty
+	GASLIMIT,			///< get the block's gas limit
+
+	POP = 0x50,			///< remove item from stack
+	MLOAD = 0x53,		///< load word from memory
+	MSTORE,				///< save word to memory
+	MSTORE8,			///< save byte to memory
+	SLOAD,				///< load word from storage
+	SSTORE,				///< save word to storage
+	JUMP,				///< alter the program counter
+	JUMPI,				///< conditionally alter the program counter
+	PC,					///< get the program counter
+	MSIZE,				///< get the size of active memory
+	GAS,				///< get the amount of available gas
+
+	PUSH1 = 0x60,		///< place 1 byte item on stack
+	PUSH2,				///< place 2 byte item on stack
+	PUSH3,				///< place 3 byte item on stack
+	PUSH4,				///< place 4 byte item on stack
+	PUSH5,				///< place 5 byte item on stack
+	PUSH6,				///< place 6 byte item on stack
+	PUSH7,				///< place 7 byte item on stack
+	PUSH8,				///< place 8 byte item on stack
+	PUSH9,				///< place 9 byte item on stack
+	PUSH10,				///< place 10 byte item on stack
+	PUSH11,				///< place 11 byte item on stack
+	PUSH12,				///< place 12 byte item on stack
+	PUSH13,				///< place 13 byte item on stack
+	PUSH14,				///< place 14 byte item on stack
+	PUSH15,				///< place 15 byte item on stack
+	PUSH16,				///< place 16 byte item on stack
+	PUSH17,				///< place 17 byte item on stack
+	PUSH18,				///< place 18 byte item on stack
+	PUSH19,				///< place 19 byte item on stack
+	PUSH20,				///< place 20 byte item on stack
+	PUSH21,				///< place 21 byte item on stack
+	PUSH22,				///< place 22 byte item on stack
+	PUSH23,				///< place 23 byte item on stack
+	PUSH24,				///< place 24 byte item on stack
+	PUSH25,				///< place 25 byte item on stack
+	PUSH26,				///< place 26 byte item on stack
+	PUSH27,				///< place 27 byte item on stack
+	PUSH28,				///< place 28 byte item on stack
+	PUSH29,				///< place 29 byte item on stack
+	PUSH30,				///< place 30 byte item on stack
+	PUSH31,				///< place 31 byte item on stack
+	PUSH32,				///< place 32 byte item on stack
+
+	DUP1 = 0x80,		///< copies the highest item in the stack to the top of the stack
+	DUP2,				///< copies the second highest item in the stack to the top of the stack
+	DUP3,				///< copies the third highest item in the stack to the top of the stack
+	DUP4,				///< copies the 4th highest item in the stack to the top of the stack
+	DUP5,				///< copies the 5th highest item in the stack to the top of the stack
+	DUP6,				///< copies the 6th highest item in the stack to the top of the stack
+	DUP7,				///< copies the 7th highest item in the stack to the top of the stack
+	DUP8,				///< copies the 8th highest item in the stack to the top of the stack
+	DUP9,				///< copies the 9th highest item in the stack to the top of the stack
+	DUP10,				///< copies the 10th highest item in the stack to the top of the stack
+	DUP11,				///< copies the 11th highest item in the stack to the top of the stack
+	DUP12,				///< copies the 12th highest item in the stack to the top of the stack
+	DUP13,				///< copies the 13th highest item in the stack to the top of the stack
+	DUP14,				///< copies the 14th highest item in the stack to the top of the stack
+	DUP15,				///< copies the 15th highest item in the stack to the top of the stack
+	DUP16,				///< copies the 16th highest item in the stack to the top of the stack
+
+	SWAP1 = 0x90,		///< swaps the highest and second highest value on the stack
+	SWAP2,				///< swaps the highest and third highest value on the stack
+	SWAP3,				///< swaps the highest and 4th highest value on the stack
+	SWAP4,				///< swaps the highest and 5th highest value on the stack
+	SWAP5,				///< swaps the highest and 6th highest value on the stack
+	SWAP6,				///< swaps the highest and 7th highest value on the stack
+	SWAP7,				///< swaps the highest and 8th highest value on the stack
+	SWAP8,				///< swaps the highest and 9th highest value on the stack
+	SWAP9,				///< swaps the highest and 10th highest value on the stack
+	SWAP10,				///< swaps the highest and 11th highest value on the stack
+	SWAP11,				///< swaps the highest and 12th highest value on the stack
+	SWAP12,				///< swaps the highest and 13th highest value on the stack
+	SWAP13,				///< swaps the highest and 14th highest value on the stack
+	SWAP14,				///< swaps the highest and 15th highest value on the stack
+	SWAP15,				///< swaps the highest and 16th highest value on the stack
+	SWAP16,				///< swaps the highest and 17th highest value on the stack
+
+	CREATE = 0xf0,		///< create a new account with associated code
+	CALL,				///< message-call into an account
+	RETURN,				///< halt execution returning output data
+	POST,				///< asynchronous call without output (adds a message to the post queue)
 	CALLSTATELESS,
-	SUICIDE = 0xff
+	SUICIDE = 0xff		///< halt execution and register account for later deletion
 };
 
 /// Information structure for a particular instruction.
diff --git a/libp2p/Common.h b/libp2p/Common.h
index 8035f462f..a83ac03de 100644
--- a/libp2p/Common.h
+++ b/libp2p/Common.h
@@ -94,6 +94,7 @@ struct PeerInfo
 	std::string host;
 	unsigned short port;
 	std::chrono::steady_clock::duration lastPing;
+	std::set<std::string> caps;
 };
 
 }
diff --git a/libp2p/Host.cpp b/libp2p/Host.cpp
index fdf1338b3..2517002ea 100644
--- a/libp2p/Host.cpp
+++ b/libp2p/Host.cpp
@@ -17,7 +17,7 @@
 /** @file Host.cpp
  * @authors:
  *   Gav Wood <i@gavwood.com>
- *   Eric Lombrozo <elombrozo@gmail.com>
+ *   Eric Lombrozo <elombrozo@gmail.com> (Windows version of populateAddresses())
  * @date 2014
  */
 
@@ -34,6 +34,7 @@
 #include <set>
 #include <chrono>
 #include <thread>
+#include <boost/algorithm/string.hpp>
 #include <libdevcore/Common.h>
 #include <libethcore/Exceptions.h>
 #include "Session.h"
@@ -54,55 +55,89 @@ static const set<bi::address> c_rejectAddresses = {
 	{bi::address_v6::from_string("::")}
 };
 
-Host::Host(std::string const& _clientVersion, unsigned short _port, string const& _publicAddress, bool _upnp, bool _localNetworking):
+Host::Host(std::string const& _clientVersion, NetworkPreferences const& _n, bool _start):
+	Worker("p2p"),
 	m_clientVersion(_clientVersion),
-	m_listenPort(_port),
-	m_localNetworking(_localNetworking),
-	m_acceptor(m_ioService, bi::tcp::endpoint(bi::tcp::v4(), _port)),
+	m_netPrefs(_n),
+	m_acceptor(m_ioService),
 	m_socket(m_ioService),
 	m_id(h512::random())
 {
 	populateAddresses();
-	determinePublic(_publicAddress, _upnp);
-	ensureAccepting();
 	m_lastPeersRequest = chrono::steady_clock::time_point::min();
 	clog(NetNote) << "Id:" << m_id.abridged();
+	if (_start)
+		start();
 }
 
-Host::Host(std::string const& _clientVersion, string const& _publicAddress, bool _upnp, bool _localNetworking):
-	m_clientVersion(_clientVersion),
-	m_listenPort(0),
-	m_localNetworking(_localNetworking),
-	m_acceptor(m_ioService, bi::tcp::endpoint(bi::tcp::v4(), 0)),
-	m_socket(m_ioService),
-	m_id(h512::random())
+Host::~Host()
 {
-	m_listenPort = m_acceptor.local_endpoint().port();
-
-	// populate addresses.
-	populateAddresses();
-	determinePublic(_publicAddress, _upnp);
-	ensureAccepting();
-	m_lastPeersRequest = chrono::steady_clock::time_point::min();
-	clog(NetNote) << "Id:" << m_id.abridged();
+	stop();
 }
 
-Host::Host(std::string const& _clientVersion):
-	m_clientVersion(_clientVersion),
-	m_listenPort(0),
-	m_acceptor(m_ioService, bi::tcp::endpoint(bi::tcp::v4(), 0)),
-	m_socket(m_ioService),
-	m_id(h512::random())
+void Host::start()
 {
-	// populate addresses.
-	populateAddresses();
+	if (isWorking())
+		stop();
+
+	for (unsigned i = 0; i < 2; ++i)
+	{
+		bi::tcp::endpoint endpoint(bi::tcp::v4(), i ? 0 : m_netPrefs.listenPort);
+		try
+		{
+			m_acceptor.open(endpoint.protocol());
+			m_acceptor.set_option(ba::socket_base::reuse_address(true));
+			m_acceptor.bind(endpoint);
+			m_acceptor.listen();
+			m_listenPort = i ? m_acceptor.local_endpoint().port() : m_netPrefs.listenPort;
+			break;
+		}
+		catch (...)
+		{
+			if (i)
+			{
+				cwarn << "Couldn't start accepting connections on host. Something very wrong with network?";
+				return;
+			}
+			m_acceptor.close();
+			continue;
+		}
+	}
+
+	determinePublic(m_netPrefs.publicIP, m_netPrefs.upnp);
+	ensureAccepting();
+
+	m_incomingPeers.clear();
+	m_freePeers.clear();
+
 	m_lastPeersRequest = chrono::steady_clock::time_point::min();
 	clog(NetNote) << "Id:" << m_id.abridged();
+
+	for (auto const& h: m_capabilities)
+		h.second->onStarting();
+
+	startWorking();
 }
 
-Host::~Host()
+void Host::stop()
 {
+	for (auto const& h: m_capabilities)
+		h.second->onStopping();
+
+	stopWorking();
+
+	if (m_acceptor.is_open())
+	{
+		if (m_accepting)
+			m_acceptor.cancel();
+		m_acceptor.close();
+		m_accepting = false;
+	}
+	if (m_socket.is_open())
+		m_socket.close();
 	disconnectPeers();
+
+	m_ioService.reset();
 }
 
 unsigned Host::protocolVersion() const
@@ -283,8 +318,14 @@ std::map<h512, bi::tcp::endpoint> Host::potentialPeers()
 		if (auto j = i.second.lock())
 		{
 			auto ep = j->endpoint();
+//			cnote << "Checking potential peer" << j->m_listenPort << j->endpoint() << isPrivateAddress(ep.address()) << ep.port() << j->m_id.abridged();
 			// Skip peers with a listen port of zero or are on a private network
-			bool peerOnNet = (j->m_listenPort != 0 && (!isPrivateAddress(ep.address()) || m_localNetworking));
+			bool peerOnNet = (j->m_listenPort != 0 && (!isPrivateAddress(ep.address()) || m_netPrefs.localNetworking));
+			if (!peerOnNet && m_incomingPeers.count(j->m_id))
+			{
+				ep = m_incomingPeers.at(j->m_id).first;
+				peerOnNet = (j->m_listenPort != 0 && (!isPrivateAddress(ep.address()) || m_netPrefs.localNetworking));
+			}
 			if (peerOnNet && ep.port() && j->m_id)
 				ret.insert(make_pair(i.first, ep));
 		}
@@ -293,7 +334,7 @@ std::map<h512, bi::tcp::endpoint> Host::potentialPeers()
 
 void Host::ensureAccepting()
 {
-	if (m_accepting == false)
+	if (!m_accepting)
 	{
 		clog(NetConnect) << "Listening on local port " << m_listenPort << " (public: " << m_public << ")";
 		m_accepting = true;
@@ -315,23 +356,38 @@ void Host::ensureAccepting()
 					clog(NetWarn) << "ERROR: " << _e.what();
 				}
 			m_accepting = false;
-			if (ec.value() != 1)
+			if (ec.value() < 1)
 				ensureAccepting();
 		});
 	}
 }
 
+string Host::pocHost()
+{
+	vector<string> strs;
+	boost::split(strs, dev::Version, boost::is_any_of("."));
+	return "poc-" + strs[1] + ".ethdev.com";
+}
+
 void Host::connect(std::string const& _addr, unsigned short _port) noexcept
 {
-	try
-	{
-		connect(bi::tcp::endpoint(bi::address::from_string(_addr), _port));
-	}
-	catch (exception const& e)
-	{
-		// Couldn't connect
-		clog(NetConnect) << "Bad host " << _addr << " (" << e.what() << ")";
-	}
+	for (int i = 0; i < 2; ++i)
+		try
+		{
+			if (i == 0)
+			{
+				bi::tcp::resolver r(m_ioService);
+				connect(r.resolve({_addr, toString(_port)})->endpoint());
+			}
+			else
+				connect(bi::tcp::endpoint(bi::address::from_string(_addr), _port));
+			break;
+		}
+		catch (exception const& e)
+		{
+			// Couldn't connect
+			clog(NetConnect) << "Bad host " << _addr << " (" << e.what() << ")";
+		}
 }
 
 void Host::connect(bi::tcp::endpoint const& _ep)
@@ -397,7 +453,6 @@ void Host::growPeers()
 				m_lastPeersRequest = chrono::steady_clock::now();
 			}
 
-
 			if (!m_accepting)
 				ensureAccepting();
 
@@ -406,7 +461,8 @@ void Host::growPeers()
 
 		auto x = time(0) % m_freePeers.size();
 		m_incomingPeers[m_freePeers[x]].second++;
-		connect(m_incomingPeers[m_freePeers[x]].first);
+		if (!m_peers.count(m_freePeers[x]))
+			connect(m_incomingPeers[m_freePeers[x]].first);
 		m_freePeers.erase(m_freePeers.begin() + x);
 	}
 }
@@ -457,11 +513,8 @@ std::vector<PeerInfo> Host::peers(bool _updatePing) const
 	return ret;
 }
 
-void Host::process()
+void Host::doWork()
 {
-	for (auto const& i: m_capabilities)
-		if (!i.second->isInitialised())
-			return;
 	growPeers();
 	prunePeers();
 	m_ioService.poll();
diff --git a/libp2p/Host.h b/libp2p/Host.h
index 54e8f967e..f5f2f9e97 100644
--- a/libp2p/Host.h
+++ b/libp2p/Host.h
@@ -29,6 +29,7 @@
 #include <utility>
 #include <thread>
 #include <libdevcore/Guards.h>
+#include <libdevcore/Worker.h>
 #include "HostCapability.h"
 namespace ba = boost::asio;
 namespace bi = boost::asio::ip;
@@ -41,22 +42,28 @@ class RLPStream;
 namespace p2p
 {
 
+struct NetworkPreferences
+{
+	NetworkPreferences(unsigned short p = 30303, std::string i = std::string(), bool u = true, bool l = false): listenPort(p), publicIP(i), upnp(u), localNetworking(l) {}
+
+	unsigned short listenPort = 30303;
+	std::string publicIP;
+	bool upnp = true;
+	bool localNetworking = false;
+};
+
 /**
  * @brief The Host class
  * Capabilities should be registered prior to startNetwork, since m_capabilities is not thread-safe.
  */
-class Host
+class Host: public Worker
 {
 	friend class Session;
 	friend class HostCapabilityFace;
 
 public:
 	/// Start server, listening for connections on the given port.
-	Host(std::string const& _clientVersion, unsigned short _port, std::string const& _publicAddress = std::string(), bool _upnp = true, bool _localNetworking = false);
-	/// Start server, listening for connections on a system-assigned port.
-	Host(std::string const& _clientVersion, std::string const& _publicAddress = std::string(), bool _upnp = true, bool _localNetworking = false);
-	/// Start server, but don't listen.
-	Host(std::string const& _clientVersion);
+	Host(std::string const& _clientVersion, NetworkPreferences const& _n = NetworkPreferences(), bool _start = false);
 
 	/// Will block on network process events.
 	virtual ~Host();
@@ -75,14 +82,10 @@ public:
 	template <class T> std::shared_ptr<T> cap() const { try { return std::static_pointer_cast<T>(m_capabilities.at(T::staticName())); } catch (...) { return nullptr; } }
 
 	/// Connect to a peer explicitly.
+	static std::string pocHost();
 	void connect(std::string const& _addr, unsigned short _port = 30303) noexcept;
 	void connect(bi::tcp::endpoint const& _ep);
 
-	/// Conduct I/O, polling, syncing, whatever.
-	/// Ideally all time-consuming I/O is done in a background thread or otherwise asynchronously, but you get this call every 100ms or so anyway.
-	/// This won't touch alter the blockchain.
-	void process();
-
 	/// @returns true iff we have the a peer of the given id.
 	bool havePeer(h512 _id) const;
 
@@ -107,11 +110,17 @@ public:
 	/// Deserialise the data and populate the set of known peers.
 	void restorePeers(bytesConstRef _b);
 
+	void setNetworkPreferences(NetworkPreferences const& _p) { stop(); m_netPrefs = _p; start(); }
+
+	void start();
+	void stop();
+	bool isStarted() const { return isWorking(); }
+
 	h512 id() const { return m_id; }
 
 	void registerPeer(std::shared_ptr<Session> _s, std::vector<std::string> const& _caps);
 
-protected:
+private:
 	/// Called when the session has provided us with a new peer we can connect to.
 	void noteNewPeers() {}
 
@@ -123,12 +132,19 @@ protected:
 	void growPeers();
 	void prunePeers();
 
+	/// Conduct I/O, polling, syncing, whatever.
+	/// Ideally all time-consuming I/O is done in a background thread or otherwise asynchronously, but you get this call every 100ms or so anyway.
+	/// This won't touch alter the blockchain.
+	virtual void doWork();
+
 	std::map<h512, bi::tcp::endpoint> potentialPeers();
 
 	std::string m_clientVersion;
 
-	unsigned short m_listenPort;
-	bool m_localNetworking = false;
+	NetworkPreferences m_netPrefs;
+
+	static const int NetworkStopped = -1;
+	int m_listenPort = NetworkStopped;
 
 	ba::io_service m_ioService;
 	bi::tcp::acceptor m_acceptor;
diff --git a/libp2p/HostCapability.h b/libp2p/HostCapability.h
index 4b6d38f64..1c532788b 100644
--- a/libp2p/HostCapability.h
+++ b/libp2p/HostCapability.h
@@ -48,7 +48,9 @@ public:
 protected:
 	virtual std::string name() const = 0;
 	virtual Capability* newPeerCapability(Session* _s) = 0;
-	virtual bool isInitialised() const { return true; }
+
+	virtual void onStarting() {}
+	virtual void onStopping() {}
 
 	void seal(bytes& _b);
 
diff --git a/libp2p/Session.cpp b/libp2p/Session.cpp
index 5ed987cff..2dc60e0de 100644
--- a/libp2p/Session.cpp
+++ b/libp2p/Session.cpp
@@ -102,7 +102,7 @@ bool Session::interpret(RLP const& _r)
 			return false;
 		}
 		try
-			{ m_info = PeerInfo({clientVersion, m_socket.remote_endpoint().address().to_string(), m_listenPort, std::chrono::steady_clock::duration()}); }
+			{ m_info = PeerInfo({clientVersion, m_socket.remote_endpoint().address().to_string(), m_listenPort, std::chrono::steady_clock::duration(), _r[3].toSet<string>()}); }
 		catch (...)
 		{
 			disconnect(BadProtocol);
@@ -159,13 +159,13 @@ bool Session::interpret(RLP const& _r)
 			bi::address_v4 peerAddress(_r[i][0].toHash<FixedHash<4>>().asArray());
 			auto ep = bi::tcp::endpoint(peerAddress, _r[i][1].toInt<short>());
 			h512 id = _r[i][2].toHash<h512>();
-			if (isPrivateAddress(peerAddress) && !m_server->m_localNetworking)
-				goto CONTINUE;
+			clogS(NetAllDetail) << "Checking: " << ep << "(" << id.abridged() << ")" << isPrivateAddress(peerAddress) << m_id.abridged() << isPrivateAddress(endpoint().address()) << m_server->m_incomingPeers.count(id) << (m_server->m_incomingPeers.count(id) ? isPrivateAddress(m_server->m_incomingPeers.at(id).first.address()) : -1);
 
-			clogS(NetAllDetail) << "Checking: " << ep << "(" << id.abridged() << ")";
+			if (isPrivateAddress(peerAddress) && !m_server->m_netPrefs.localNetworking)
+				goto CONTINUE;
 
 			// check that it's not us or one we already know:
-			if (id && (m_server->m_id == id || m_server->havePeer(id) || m_server->m_incomingPeers.count(id)))
+			if (!(m_id == id && isPrivateAddress(endpoint().address()) && (!m_server->m_incomingPeers.count(id) || isPrivateAddress(m_server->m_incomingPeers.at(id).first.address()))) && (!id || m_server->m_id == id || m_server->m_incomingPeers.count(id)))
 				goto CONTINUE;
 
 			// check that we're not already connected to addr:
@@ -180,7 +180,7 @@ bool Session::interpret(RLP const& _r)
 			m_server->m_incomingPeers[id] = make_pair(ep, 0);
 			m_server->m_freePeers.push_back(id);
 			m_server->noteNewPeers();
-            clogS(NetTriviaDetail) << "New peer: " << ep << "(" << id << ")";
+			clogS(NetTriviaDetail) << "New peer: " << ep << "(" << id .abridged()<< ")";
 			CONTINUE:;
 		}
 		break;
@@ -266,19 +266,19 @@ void Session::writeImpl(bytes& _buffer)
 	if (!m_socket.is_open())
 		return;
 
-	lock_guard<recursive_mutex> l(m_writeLock);
-	m_writeQueue.push_back(_buffer);
-	if (m_writeQueue.size() == 1)
+	bool doWrite = false;
+	{
+		lock_guard<mutex> l(m_writeLock);
+		m_writeQueue.push_back(_buffer);
+		doWrite = (m_writeQueue.size() == 1);
+	}
+
+	if (doWrite)
 		write();
 }
 
 void Session::write()
 {
-//	cerr << (void*)this << " write" << endl;
-	lock_guard<recursive_mutex> l(m_writeLock);
-	if (m_writeQueue.empty())
-		return;
-	
 	const bytes& bytes = m_writeQueue[0];
 	auto self(shared_from_this());
 	ba::async_write(m_socket, ba::buffer(bytes), [this, self](boost::system::error_code ec, std::size_t /*length*/)
@@ -290,12 +290,16 @@ void Session::write()
 		{
 			cwarn << "Error sending: " << ec.message();
 			dropped();
+			return;
 		}
 		else
 		{
+			lock_guard<mutex> l(m_writeLock);
 			m_writeQueue.pop_front();
-			write();
+			if (m_writeQueue.empty())
+				return;
 		}
+		write();
 	});
 }
 
diff --git a/libp2p/Session.h b/libp2p/Session.h
index bc43934b3..7c3fc3732 100644
--- a/libp2p/Session.h
+++ b/libp2p/Session.h
@@ -86,7 +86,7 @@ private:
 
 	Host* m_server;
 
-	std::recursive_mutex m_writeLock;
+	std::mutex m_writeLock;
 	std::deque<bytes> m_writeQueue;
 
 	mutable bi::tcp::socket m_socket;	///< Mutable to ask for native_handle().
diff --git a/libqethereum/CMakeLists.txt b/libqethereum/CMakeLists.txt
index f9be5751f..68ee1bb9d 100644
--- a/libqethereum/CMakeLists.txt
+++ b/libqethereum/CMakeLists.txt
@@ -105,6 +105,6 @@ else ()
 	target_link_libraries(${EXECUTABLE} boost_filesystem)
 	find_package(Threads REQUIRED)
 	target_link_libraries(${EXECUTABLE} ${CMAKE_THREAD_LIBS_INIT})
-	install( TARGETS ${EXECUTABLE} RUNTIME DESTINATION bin )
+	install( TARGETS ${EXECUTABLE} ARCHIVE DESTINATION lib LIBRARY DESTINATION lib )
 endif ()
 
diff --git a/libqethereum/QEthereum.cpp b/libqethereum/QEthereum.cpp
index 689daf8d7..714081dfe 100644
--- a/libqethereum/QEthereum.cpp
+++ b/libqethereum/QEthereum.cpp
@@ -8,41 +8,8 @@
 #include <libethereum/EthereumHost.h>
 #include "QEthereum.h"
 using namespace std;
-
-// types
-using dev::bytes;
-using dev::bytesConstRef;
-using dev::h160;
-using dev::h256;
-using dev::u160;
-using dev::u256;
-using dev::u256s;
-using dev::RLP;
-using dev::Address;
-using dev::eth::BlockInfo;
-using dev::eth::Client;
-using dev::eth::Instruction;
-using dev::KeyPair;
-using dev::eth::NodeMode;
-using dev::p2p::PeerInfo;
-using dev::Secret;
-using dev::eth::Transaction;
-
-// functions
-using dev::toHex;
-using dev::fromHex;
-using dev::right160;
-using dev::simpleDebugOut;
-using dev::toLog2;
-using dev::toString;
-using dev::operator+;
-using dev::eth::disassemble;
-using dev::eth::units;
-using dev::eth::formatBalance;
-
-// vars
-using dev::g_logPost;
-using dev::g_logVerbosity;
+using namespace dev;
+using namespace dev::eth;
 
 dev::bytes toBytes(QString const& _s)
 {
@@ -89,7 +56,7 @@ QString unpadded(QString _s)
 	return _s;
 }
 
-QEthereum::QEthereum(QObject* _p, Client* _c, QList<dev::KeyPair> _accounts):
+QEthereum::QEthereum(QObject* _p, eth::Interface* _c, QList<dev::KeyPair> _accounts):
 	QObject(_p), m_client(_c), m_accounts(_accounts)
 {
 	// required to prevent crash on osx when performing addto/evaluatejavascript calls
@@ -120,7 +87,7 @@ QString QEthereum::secretToAddress(QString _s) const
 	return toQJS(KeyPair(toSecret(_s)).address());
 }
 
-Client* QEthereum::client() const
+eth::Interface* QEthereum::client() const
 {
 	return m_client;
 }
@@ -162,7 +129,7 @@ QString QEthereum::coinbase() const
 
 QString QEthereum::number() const
 {
-	return m_client ? QString::number(client()->blockChain().number() + 1) : "";
+	return m_client ? QString::number(client()->number() + 1) : "";
 }
 
 QString QEthereum::account() const
@@ -381,7 +348,7 @@ bool QEthereum::isMining() const
 
 bool QEthereum::isListening() const
 {
-	return m_client ? client()->haveNetwork() : false;
+	return /*m_client ? client()->haveNetwork() :*/ false;
 }
 
 void QEthereum::setMining(bool _l)
@@ -395,19 +362,19 @@ void QEthereum::setMining(bool _l)
 	}
 }
 
-void QEthereum::setListening(bool _l)
+void QEthereum::setListening(bool)
 {
 	if (!m_client)
 		return;
-	if (_l)
+/*	if (_l)
 		client()->startNetwork();
 	else
-		client()->stopNetwork();
+		client()->stopNetwork();*/
 }
 
 unsigned QEthereum::peerCount() const
 {
-	return m_client ? (unsigned)client()->peerCount() : 0;
+	return /*m_client ? (unsigned)client()->peerCount() :*/ 0;
 }
 
 QString QEthereum::doCreate(QString _secret, QString _amount, QString _init, QString _gas, QString _gasPrice)
diff --git a/libqethereum/QEthereum.h b/libqethereum/QEthereum.h
index cacf1cfc4..50f2d96a5 100644
--- a/libqethereum/QEthereum.h
+++ b/libqethereum/QEthereum.h
@@ -7,8 +7,7 @@
 #include <libethcore/CommonEth.h>
 
 namespace dev { namespace eth {
-class Client;
-class State;
+class Interface;
 }}
 
 class QJSEngine;
@@ -99,11 +98,11 @@ class QEthereum: public QObject
 	Q_OBJECT
 
 public:
-	QEthereum(QObject* _p, dev::eth::Client* _c, QList<dev::KeyPair> _accounts);
+	QEthereum(QObject* _p, dev::eth::Interface* _c, QList<dev::KeyPair> _accounts);
 	virtual ~QEthereum();
 
-	dev::eth::Client* client() const;
-	void setClient(dev::eth::Client* _c) { m_client = _c; }
+	dev::eth::Interface* client() const;
+	void setClient(dev::eth::Interface* _c) { m_client = _c; }
 
 	/// Call when the client() is going to be deleted to make this object useless but safe.
 	void clientDieing();
@@ -199,7 +198,7 @@ private:
 	Q_PROPERTY(unsigned peerCount READ peerCount NOTIFY miningChanged)
 	Q_PROPERTY(int defaultBlock READ getDefault WRITE setDefault)
 
-	dev::eth::Client* m_client;
+	dev::eth::Interface* m_client;
 	std::vector<unsigned> m_watches;
 	QList<dev::KeyPair> m_accounts;
 };
diff --git a/libqethereum/QmlEthereum.cpp b/libqethereum/QmlEthereum.cpp
index 350427f3e..89578a29a 100644
--- a/libqethereum/QmlEthereum.cpp
+++ b/libqethereum/QmlEthereum.cpp
@@ -50,7 +50,7 @@ using dev::g_logVerbosity;
 // Can get rid of this once we've sorted out ITC for signalling & multiplexed querying.
 dev::eth::Client* g_qmlClient;
 QObject* g_qmlMain;
-
+#if 0
 QmlAccount::QmlAccount(QObject*)
 {
 }
@@ -177,6 +177,8 @@ void QmlEthereum::transact(Secret _secret, Address _dest, u256 _amount, u256 _ga
 	client()->transact(_secret, _amount, _dest, bytes(_data.data(), _data.data() + _data.size()), _gas, _gasPrice);
 }
 
+#endif
+
 // extra bits needed to link on VS
 #ifdef _MSC_VER
 
diff --git a/libqethereum/QmlEthereum.h b/libqethereum/QmlEthereum.h
index dcb636301..d242540a1 100644
--- a/libqethereum/QmlEthereum.h
+++ b/libqethereum/QmlEthereum.h
@@ -23,8 +23,8 @@ Q_DECLARE_METATYPE(dev::u256)
 Q_DECLARE_METATYPE(dev::Address)
 Q_DECLARE_METATYPE(dev::Secret)
 Q_DECLARE_METATYPE(dev::KeyPair)
-Q_DECLARE_METATYPE(QmlAccount*)
-Q_DECLARE_METATYPE(QmlEthereum*)
+//Q_DECLARE_METATYPE(QmlAccount*)
+//Q_DECLARE_METATYPE(QmlEthereum*)
 
 class QmlU256Helper: public QObject
 {
@@ -75,7 +75,7 @@ public:
 	Q_INVOKABLE QString stringOf(dev::Address _a) const { return QString::fromStdString(dev::toHex(_a.asArray())); }
 	Q_INVOKABLE QString toAbridged(dev::Address _a) const { return QString::fromStdString(_a.abridged()); }
 };
-
+#if 0
 class QmlAccount: public QObject
 {
 	Q_OBJECT
@@ -155,7 +155,7 @@ private:
 	Q_PROPERTY(bool listening READ isListening WRITE setListening)
 	Q_PROPERTY(bool mining READ isMining WRITE setMining)
 };
-
+#endif
 #if 0
 template <class T> T to(QVariant const& _s) { if (_s.type() != QVariant::String) return T(); auto s = _s.toString().toLatin1(); assert(s.size() == sizeof(T)); return *(T*)s.data(); }
 template <class T> QVariant toQJS(T const& _s) { QLatin1String ret((char*)&_s, sizeof(T)); assert(QVariant(QString(ret)).toString().toLatin1().size() == sizeof(T)); assert(*(T*)(QVariant(QString(ret)).toString().toLatin1().data()) == _s); return QVariant(QString(ret)); }
diff --git a/libwebthree/WebThree.cpp b/libwebthree/WebThree.cpp
index 93f81dd0a..55e82a36f 100644
--- a/libwebthree/WebThree.cpp
+++ b/libwebthree/WebThree.cpp
@@ -35,102 +35,50 @@ using namespace dev::p2p;
 using namespace dev::eth;
 using namespace dev::shh;
 
-WebThreeDirect::WebThreeDirect(std::string const& _clientVersion, std::string const& _dbPath, bool _forceClean, std::set<std::string> const& _interfaces, unsigned short _listenPort, std::string const& _publicIP, bool _upnp, dev::u256 _networkId, bool _localNetworking):
+WebThreeDirect::WebThreeDirect(std::string const& _clientVersion, std::string const& _dbPath, bool _forceClean, std::set<std::string> const& _interfaces, NetworkPreferences const& _n):
 	m_clientVersion(_clientVersion),
-	m_net(m_clientVersion, _listenPort, _publicIP, _upnp, _localNetworking)
+	m_net(_clientVersion, _n)
 {
 	if (_dbPath.size())
 		Defaults::setDBPath(_dbPath);
 
 	if (_interfaces.count("eth"))
-		m_ethereum.reset(new eth::Client(&m_net, _dbPath, _forceClean, _networkId));
+		m_ethereum.reset(new eth::Client(&m_net, _dbPath, _forceClean));
 
 //	if (_interfaces.count("shh"))
 //		m_whisper = new eth::Whisper(m_net.get());
-
-	static const char* c_threadName = "net";
-
-	UpgradableGuard l(x_work);
-	{
-		UpgradeGuard ul(l);
-
-		if (!m_work)
-			m_work.reset(new thread([&]()
-			{
-				setThreadName(c_threadName);
-				m_workState.store(Active, std::memory_order_release);
-				while (m_workState.load(std::memory_order_acquire) != Deleting)
-					workNet();
-				m_workState.store(Deleted, std::memory_order_release);
-			}));
-
-	}
 }
 
 WebThreeDirect::~WebThreeDirect()
 {
-	UpgradableGuard l(x_work);
-
-	if (m_work)
-	{
-		if (m_workState.load(std::memory_order_acquire) == Active)
-			m_workState.store(Deleting, std::memory_order_release);
-		while (m_workState.load(std::memory_order_acquire) != Deleted)
-			this_thread::sleep_for(chrono::milliseconds(10));
-		m_work->join();
-	}
-	if (m_work)
-	{
-		UpgradeGuard ul(l);
-		m_work.reset(nullptr);
-	}
 }
 
 std::vector<PeerInfo> WebThreeDirect::peers()
 {
-	ReadGuard l(x_work);
 	return m_net.peers();
 }
 
 size_t WebThreeDirect::peerCount() const
 {
-	ReadGuard l(x_work);
 	return m_net.peerCount();
 }
 
 void WebThreeDirect::setIdealPeerCount(size_t _n)
 {
-	ReadGuard l(x_work);
 	return m_net.setIdealPeerCount(_n);
 }
 
 bytes WebThreeDirect::savePeers()
 {
-	ReadGuard l(x_work);
 	return m_net.savePeers();
 }
 
 void WebThreeDirect::restorePeers(bytesConstRef _saved)
 {
-	ReadGuard l(x_work);
 	return m_net.restorePeers(_saved);
 }
 
 void WebThreeDirect::connect(std::string const& _seedHost, unsigned short _port)
 {
-	ReadGuard l(x_work);
 	m_net.connect(_seedHost, _port);
 }
-
-void WebThreeDirect::workNet()
-{
-	// Process network events.
-	// Synchronise block chain with network.
-	// Will broadcast any of our (new) transactions and blocks, and collect & add any of their (new) transactions and blocks.
-	{
-		ReadGuard l(x_work);
-		m_net.process();	// must be in guard for now since it uses the blockchain.
-	}
-	this_thread::sleep_for(chrono::milliseconds(1));
-}
-
diff --git a/libwebthree/WebThree.h b/libwebthree/WebThree.h
index cf02c3122..06717ee26 100644
--- a/libwebthree/WebThree.h
+++ b/libwebthree/WebThree.h
@@ -66,7 +66,7 @@ class WebThreeDirect
 public:
 	/// Constructor for private instance. If there is already another process on the machine using @a _dbPath, then this will throw an exception.
 	/// ethereum() may be safely static_cast()ed to a eth::Client*.
-	WebThreeDirect(std::string const& _clientVersion, std::string const& _dbPath, bool _forceClean = false, std::set<std::string> const& _interfaces = {"eth", "shh"}, unsigned short _listenPort = 30303, std::string const& _publicIP = std::string(), bool _upnp = true, dev::u256 _networkId = 0, bool _localNetworking = false);
+	WebThreeDirect(std::string const& _clientVersion, std::string const& _dbPath, bool _forceClean = false, std::set<std::string> const& _interfaces = {"eth", "shh"}, p2p::NetworkPreferences const& _n = p2p::NetworkPreferences());
 
 	/// Destructor.
 	~WebThreeDirect();
@@ -104,25 +104,23 @@ public:
 	/// Sets the ideal number of peers.
 	void setIdealPeerCount(size_t _n);
 
+	bool haveNetwork() const { return m_net.isStarted(); }
+
+	void setNetworkPreferences(p2p::NetworkPreferences const& _n) { auto had = haveNetwork(); if (had) stopNetwork(); m_net.setNetworkPreferences(_n); if (had) startNetwork(); }
+
 	/// Start the network subsystem.
-	void startNetwork() { setIdealPeerCount(5); }
+	void startNetwork() { m_net.start(); }
 
 	/// Stop the network subsystem.
-	void stopNetwork() { setIdealPeerCount(0); }
+	void stopNetwork() { m_net.stop(); }
 
 private:
-	/// Do some work on the network.
-	void workNet();
-
 	std::string m_clientVersion;					///< Our end-application client's name/version.
 
 	std::unique_ptr<eth::Client> m_ethereum;		///< Main interface for Ethereum ("eth") protocol.
 	std::unique_ptr<shh::WhisperHost> m_whisper;	///< Main interface for Whisper ("shh") protocol.
 
 	p2p::Host m_net;								///< Should run in background and send us events when blocks found and allow us to send blocks as required.
-	std::unique_ptr<std::thread> m_work;			///< The network thread.
-	mutable boost::shared_mutex x_work;				///< Lock for the network existance.
-	std::atomic<WorkState> m_workState;
 };
 
 
@@ -137,7 +135,7 @@ class RPCMaster {};
 class EthereumSlave: public eth::Interface
 {
 public:
-	EthereumSlave(RPCSlave* _c) {}
+	EthereumSlave(RPCSlave*) {}
 
 	// TODO: implement all of the virtuals with the RLPClient link.
 };
@@ -145,7 +143,7 @@ public:
 class EthereumMaster
 {
 public:
-	EthereumMaster(RPCMaster* _m) {}
+	EthereumMaster(RPCMaster*) {}
 
 	// TODO: implement the master-end of whatever the RLPClient link will send over.
 };
@@ -155,7 +153,7 @@ public:
 class WhisperSlave: public shh::Interface
 {
 public:
-	WhisperSlave(RPCSlave* _c) {}
+	WhisperSlave(RPCSlave*) {}
 
 	// TODO: implement all of the virtuals with the RLPClient link.
 };
@@ -163,7 +161,7 @@ public:
 class WhisperMaster
 {
 public:
-	WhisperMaster(RPCMaster* _m) {}
+	WhisperMaster(RPCMaster*) {}
 
 	// TODO: implement the master-end of whatever the RLPClient link will send over.
 };
diff --git a/libwhisper/WhisperPeer.h b/libwhisper/WhisperPeer.h
index ea79572c8..94d3233c1 100644
--- a/libwhisper/WhisperPeer.h
+++ b/libwhisper/WhisperPeer.h
@@ -95,7 +95,7 @@ class MessageFilter
 public:
 	MessageFilter() {}
 	MessageFilter(std::vector<std::pair<bytes, bytes> > const& _m): m_topicMasks(_m) {}
-	MessageFilter(RLP const& _r): m_topicMasks(_r.operator std::vector<std::pair<bytes, bytes>>()) {}
+	MessageFilter(RLP const& _r): m_topicMasks((std::vector<std::pair<bytes, bytes>>)_r) {}
 
 	void fillStream(RLPStream& _s) const { _s << m_topicMasks; }
 	h256 sha3() const { RLPStream s; fillStream(s); return dev::eth::sha3(s.out()); }
diff --git a/neth/CMakeLists.txt b/neth/CMakeLists.txt
index 3e8dab70d..2b3f92947 100644
--- a/neth/CMakeLists.txt
+++ b/neth/CMakeLists.txt
@@ -11,6 +11,7 @@ set(EXECUTABLE neth)
 
 add_executable(${EXECUTABLE} ${SRC_LIST})
 
+target_link_libraries(${EXECUTABLE} webthree)
 target_link_libraries(${EXECUTABLE} ethereum)
 target_link_libraries(${EXECUTABLE} secp256k1)
 target_link_libraries(${EXECUTABLE} gmp)
diff --git a/neth/main.cpp b/neth/main.cpp
index e492d1a3c..0dc552e39 100644
--- a/neth/main.cpp
+++ b/neth/main.cpp
@@ -39,6 +39,7 @@
 #include <eth/CommonJS.h>
 #include <eth/CommonJS.cpp>
 #endif
+#include <libwebthree/WebThree.h>
 #include "BuildInfo.h"
 
 #undef KEY_EVENT // from windows.h
@@ -304,7 +305,6 @@ int main(int argc, char** argv)
 	unsigned short remotePort = 30303;
 	string dbPath;
 	bool mining = false;
-	NodeMode mode = NodeMode::Full;
 	unsigned peers = 5;
 #if ETH_JSONRPC
 	int jsonrpc = 8080;
@@ -389,19 +389,6 @@ int main(int argc, char** argv)
 			g_logVerbosity = atoi(argv[++i]);
 		else if ((arg == "-x" || arg == "--peers") && i + 1 < argc)
 			peers = atoi(argv[++i]);
-		else if ((arg == "-o" || arg == "--mode") && i + 1 < argc)
-		{
-			string m = argv[++i];
-			if (m == "full")
-				mode = NodeMode::Full;
-			else if (m == "peer")
-				mode = NodeMode::PeerServer;
-			else
-			{
-				cerr << "Unknown mode: " << m << endl;
-				return -1;
-			}
-		}
 		else if (arg == "-h" || arg == "--help")
 			help();
 		else if (arg == "-V" || arg == "--version")
@@ -413,7 +400,8 @@ int main(int argc, char** argv)
 	if (!clientName.empty())
 		clientName += "/";
 
-	Client c("NEthereum(++)/" + clientName + "v" + dev::Version + "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM), coinbase, dbPath);
+	WebThreeDirect web3("NEthereum(++)/" + clientName + "v" + dev::Version + "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM), dbPath);
+	Client& c = *web3.ethereum();
 
 	c.setForceMining(true);
 
@@ -479,7 +467,12 @@ int main(int argc, char** argv)
 	wmove(mainwin, 1, 4);
 
 	if (!remoteHost.empty())
-		c.startNetwork(listenPort, remoteHost, remotePort, mode, peers, publicIP, upnp);
+	{
+		web3.setIdealPeerCount(peers);
+		web3.setNetworkPreferences(NetworkPreferences(listenPort, publicIP, upnp));
+		web3.startNetwork();
+		web3.connect(remoteHost, remotePort);
+	}
 	if (mining)
 		c.startMining();
 
@@ -487,7 +480,7 @@ int main(int argc, char** argv)
 	auto_ptr<EthStubServer> jsonrpcServer;
 	if (jsonrpc > -1)
 	{
-		jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), c));
+		jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), web3));
 		jsonrpcServer->setKeys({us});
 		jsonrpcServer->StartListening();
 	}
@@ -528,18 +521,19 @@ int main(int argc, char** argv)
 		{
 			unsigned port;
 			iss >> port;
-			c.startNetwork((short)port);
+			web3.setNetworkPreferences(NetworkPreferences((short)port, publicIP, upnp));
+			web3.startNetwork();
 		}
 		else if (cmd == "connect")
 		{
 			string addr;
 			unsigned port;
 			iss >> addr >> port;
-			c.connect(addr, (short)port);
+			web3.connect(addr, (short)port);
 		}
 		else if (cmd == "netstop")
 		{
-			c.stopNetwork();
+			web3.stopNetwork();
 		}
 		else if (cmd == "minestart")
 		{
@@ -560,7 +554,7 @@ int main(int argc, char** argv)
 		{
 			if (jsonrpc < 0)
 				jsonrpc = 8080;
-			jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), c));
+			jsonrpcServer = auto_ptr<EthStubServer>(new EthStubServer(new jsonrpc::HttpServer(jsonrpc), web3));
 			jsonrpcServer->setKeys({us});
 			jsonrpcServer->StartListening();
 		}
@@ -589,7 +583,7 @@ int main(int argc, char** argv)
 		}
 		else if (cmd == "peers")
 		{
-			for (auto it: c.peers())
+			for (auto it: web3.peers())
 				cout << it.host << ":" << it.port << ", " << it.clientVersion << ", "
 					<< std::chrono::duration_cast<std::chrono::milliseconds>(it.lastPing).count() << "ms"
 					<< endl;
@@ -925,7 +919,7 @@ int main(int argc, char** argv)
 
 		// Peers
 		y = 1;
-		for (PeerInfo const& i: c.peers())
+		for (PeerInfo const& i: web3.peers())
 		{
 			auto s = boost::format("%1% ms - %2%:%3% - %4%") %
 				toString(chrono::duration_cast<chrono::milliseconds>(i.lastPing).count()) %
@@ -971,7 +965,7 @@ int main(int argc, char** argv)
 
 		// Peers
 		mvwprintw(peerswin, 0, x, "Peers: ");
-		mvwprintw(peerswin, 0, 9, toString(c.peers().size()).c_str());
+		mvwprintw(peerswin, 0, 9, toString(web3.peers().size()).c_str());
 
 		// Mining flag
 		if (c.isMining())
diff --git a/package.sh b/package.sh
index 681c20096..f6d45b07c 100755
--- a/package.sh
+++ b/package.sh
@@ -3,7 +3,7 @@
 opwd="$PWD"
 br=$(git branch | grep '\*' | sed 's/^..//')
 
-n=cpp-ethereum-src-$(date "+%Y%m%d%H%M%S" --date="1970-01-01 $(git log -1 --date=short --pretty=format:%ct) sec GMT")-$(grep "EthVersion = " libethential/Common.cpp | sed 's/^[^"]*"//' | sed 's/".*$//')-$(git rev-parse HEAD | cut -c1-6)
+n=cpp-ethereum-src-$(date "+%Y%m%d%H%M%S" --date="1970-01-01 $(git log -1 --date=short --pretty=format:%ct) sec GMT")-$(grep "Version = " libdevcore/Common.cpp | sed 's/^[^"]*"//' | sed 's/".*$//')-$(git rev-parse HEAD | cut -c1-6)
 
 cd /tmp
 git clone "$opwd" $n
diff --git a/sc/cmdline.cpp b/sc/cmdline.cpp
index 69e96b41e..b7a15634a 100644
--- a/sc/cmdline.cpp
+++ b/sc/cmdline.cpp
@@ -3,6 +3,7 @@
 #include <iostream>
 #include <vector>
 #include <map>
+#include <string>
 #include <libserpent/funcs.h>
 
 int main(int argv, char** argc) {
diff --git a/test/TestHelper.cpp b/test/TestHelper.cpp
index 02a883dbc..20c42a9b8 100644
--- a/test/TestHelper.cpp
+++ b/test/TestHelper.cpp
@@ -42,11 +42,14 @@ void mine(Client& c, int numBlocks)
 
 void connectClients(Client& c1, Client& c2)
 {
+	// TODO: Move to WebThree. eth::Client no longer handles networking.
+#if 0
 	short c1Port = 20000;
 	short c2Port = 21000;
 	c1.startNetwork(c1Port);
 	c2.startNetwork(c2Port);
 	c2.connect("127.0.0.1", c1Port);
+#endif
 }
 
 }
diff --git a/test/peer.cpp b/test/peer.cpp
index 821aab514..a99ce7201 100644
--- a/test/peer.cpp
+++ b/test/peer.cpp
@@ -46,7 +46,7 @@ int peerTest(int argc, char** argv)
 			remoteHost = argv[i];
 	}
 
-	Host ph("Test", listenPort);
+	Host ph("Test", NetworkPreferences(listenPort));
 
 	if (!remoteHost.empty())
 		ph.connect(remoteHost, remotePort);
diff --git a/test/vm.cpp b/test/vm.cpp
index e177855cb..8100ee822 100644
--- a/test/vm.cpp
+++ b/test/vm.cpp
@@ -219,13 +219,13 @@ public:
 						if (li)
 							store[curKey] = curVal;
 						li = s.first;
-						curKey = toString(li);
+						curKey = "0x"+toHex(toCompactBigEndian(li));
 						curVal = mArray();
 					}
 					else
 						for (; li != s.first; ++li)
 							curVal.push_back(0);
-					push(curVal, s.second);
+					curVal.push_back("0x"+toHex(toCompactBigEndian(s.second)));
 					++li;
 				}
 				if (li)
@@ -474,8 +474,9 @@ void doTests(json_spirit::mValue& v, bool _fillin)
 
 BOOST_AUTO_TEST_CASE(vm_tests)
 {
+	/*
 	// Populate tests first:
-//	try
+	try
 	{
 		cnote << "Populating VM tests...";
 		json_spirit::mValue v;
@@ -485,7 +486,7 @@ BOOST_AUTO_TEST_CASE(vm_tests)
 		dev::test::doTests(v, true);
 		writeFile("../../../tests/vmtests.json", asBytes(json_spirit::write_string(v, true)));
 	}
-/*	catch (std::exception const& e)
+	catch (std::exception const& e)
 	{
 		BOOST_ERROR("Failed VM Test with Exception: " << e.what());
 	}*/
@@ -504,3 +505,30 @@ BOOST_AUTO_TEST_CASE(vm_tests)
 		BOOST_ERROR("Failed VM Test with Exception: " << e.what()); 
 	}
 }
+
+BOOST_AUTO_TEST_CASE(vmArithmeticTest)
+{
+	/*
+			cnote << "Populating VM tests...";
+			json_spirit::mValue v;
+			string s = asString(contents("../../../cpp-ethereum/test/vmArithmeticTestFiller.json"));
+			BOOST_REQUIRE_MESSAGE(s.length() > 0, "Contents of 'vmtests.json' is empty.");
+			json_spirit::read_string(s, v);
+			dev::test::doTests(v, true);
+			writeFile("../../../tests/vmArithmeticTest.json", asBytes(json_spirit::write_string(v, true)));
+	*/
+
+	try
+	{
+		cnote << "Testing VM arithmetic commands...";
+		json_spirit::mValue v;
+		string s = asString(contents("../../../tests/vmArithmeticTest.json"));
+		BOOST_REQUIRE_MESSAGE(s.length() > 0, "Contents of 'vmArithmeticTest.json' is empty. Have you cloned the 'tests' repo branch develop?");
+		json_spirit::read_string(s, v);
+		dev::test::doTests(v, false);
+	}
+	catch (std::exception const& e)
+	{
+		BOOST_ERROR("Failed VM arithmetic test with Exception: " << e.what());
+	}
+}
diff --git a/test/vmArithmeticTestFiller.json b/test/vmArithmeticTestFiller.json
new file mode 100644
index 000000000..d7826d198
--- /dev/null
+++ b/test/vmArithmeticTestFiller.json
@@ -0,0 +1,2055 @@
+{
+    "stop": {
+        "env" : {
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+            "currentNumber" : "0",
+            "currentGasLimit" : "1000000",
+            "currentDifficulty" : "256",
+            "currentTimestamp" : 1,
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "nonce" : 0,
+                "code" : "0x00",
+                "storage": {}
+            }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "add0": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (+ 115792089237316195423570985008687907853269984665640564039457584007913129639935 115792089237316195423570985008687907853269984665640564039457584007913129639935) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "add1": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (+ 115792089237316195423570985008687907853269984665640564039457584007913129639935 4) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "add2": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (+ 115792089237316195423570985008687907853269984665640564039457584007913129639936 1) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "add3": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (+ 0 0) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "add4": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (+ 1 115792089237316195423570985008687907853269984665640564039457584007913129639935) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+
+    "mul0": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (* 2 3) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+
+    "mul1": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (* 115792089237316195423570985008687907853269984665640564039457584007913129639935 115792089237316195423570985008687907853269984665640564039457584007913129639935) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "mul2": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (* 0 23) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "mul3": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (* 23 1) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "sub0": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (- 23 1) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "sub1": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (- 2 3) }",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "sub2": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
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+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "sgt4": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (SGT (- 0 5) (- 0 3) )}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "eq0": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (EQ (- 0 5) (- 0 3) )}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "eq1": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (EQ 0 0)}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "eq2": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (EQ 115792089237316195423570985008687907853269984665640564039457584007913129639935 115792089237316195423570985008687907853269984665640564039457584007913129639935 )}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "not0": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (NOT 115792089237316195423570985008687907853269984665640564039457584007913129639935 )}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+    "not1": {
+        "env" : {
+        "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6",
+        "currentNumber" : "0",
+        "currentGasLimit" : "1000000",
+        "currentDifficulty" : "256",
+        "currentTimestamp" : 1,
+        "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"
+        },
+        "pre" : {
+        "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+            "balance" : "1000000000000000000",
+            "nonce" : 0,
+            "code" : "{ [[ 0 ]] (NOT 0 )}",
+            "storage": {}
+        }
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000",
+            "data" : "",
+            "gasPrice" : "100000000000000",
+            "gas" : "10000"
+        }
+    },
+
+
+
+}
diff --git a/third/CMakeLists.txt b/third/CMakeLists.txt
index a68b90813..77b2bb496 100644
--- a/third/CMakeLists.txt
+++ b/third/CMakeLists.txt
@@ -52,7 +52,7 @@ else ()
 endif ()
 
 qt5_use_modules(${EXECUTEABLE} Core)# Gui Widgets Network WebKit WebKitWidgets)
-target_link_libraries(${EXECUTEABLE} qethereum ethereum evm ethcore secp256k1 gmp ${CRYPTOPP_LS} serpent lll evmface devcore)
+target_link_libraries(${EXECUTEABLE} webthree qethereum ethereum evm ethcore secp256k1 gmp ${CRYPTOPP_LS} serpent lll evmface devcore)
 
 if (APPLE)
 	# First have qt5 install plugins and frameworks
diff --git a/third/MainWin.cpp b/third/MainWin.cpp
index 7bbdd721b..be8420426 100644
--- a/third/MainWin.cpp
+++ b/third/MainWin.cpp
@@ -31,6 +31,7 @@
 #include <libserpent/funcs.h>
 #include <libserpent/util.h>
 #include <libethcore/Dagger.h>
+#include <libdevcrypto/FileSystem.h>
 #include <liblll/Compiler.h>
 #include <liblll/CodeFragment.h>
 #include <libevm/VM.h>
@@ -38,49 +39,14 @@
 #include <libethereum/ExtVM.h>
 #include <libethereum/Client.h>
 #include <libethereum/EthereumHost.h>
+#include <libwebthree/WebThree.h>
 #include "BuildInfo.h"
 #include "MainWin.h"
 #include "ui_Main.h"
 using namespace std;
-
-// types
-using dev::bytes;
-using dev::bytesConstRef;
-using dev::h160;
-using dev::h256;
-using dev::u160;
-using dev::u256;
-using dev::Address;
-using dev::eth::BlockInfo;
-using dev::eth::Client;
-using dev::eth::Instruction;
-using dev::KeyPair;
-using dev::eth::NodeMode;
-using dev::eth::BlockChain;
-using dev::p2p::PeerInfo;
-using dev::RLP;
-using dev::Secret;
-using dev::eth::Transaction;
-using dev::eth::Executive;
-
-// functions
-using dev::toHex;
-using dev::fromHex;
-using dev::left160;
-using dev::right160;
-using dev::simpleDebugOut;
-using dev::toLog2;
-using dev::toString;
-using dev::operator<<;
-using dev::eth::units;
-using dev::eth::compileLLL;
-using dev::eth::disassemble;
-using dev::eth::formatBalance;
-using dev::eth::sha3;
-
-// vars
-using dev::g_logPost;
-using dev::g_logVerbosity;
+using namespace dev;
+using namespace dev::eth;
+using namespace dev::p2p;
 
 static QString fromRaw(dev::h256 _n, unsigned* _inc = nullptr)
 {
@@ -133,12 +99,13 @@ Main::Main(QWidget *parent) :
 	
 	connect(ui->ourAccounts->model(), SIGNAL(rowsMoved(const QModelIndex &, int, int, const QModelIndex &, int)), SLOT(ourAccountsRowsMoved()));
 
-	m_client.reset(new Client("Third"));
+	m_web3.reset(new WebThreeDirect("Third", getDataDir() + "/Third", false, {"eth", "shh"}));
+	m_web3->connect(Host::pocHost());
 
 	connect(ui->webView, &QWebView::loadStarted, [this]()
 	{
 		// NOTE: no need to delete as QETH_INSTALL_JS_NAMESPACE adopts it.
-		m_ethereum = new QEthereum(this, m_client.get(), owned());
+		m_ethereum = new QEthereum(this, ethereum(), owned());
 
 		QWebFrame* f = ui->webView->page()->mainFrame();
 		f->disconnect(SIGNAL(javaScriptWindowObjectCleared()));
@@ -181,6 +148,11 @@ Main::~Main()
 	writeSettings();
 }
 
+eth::Client* Main::ethereum() const
+{
+	return m_web3->ethereum();
+}
+
 void Main::onKeysChanged()
 {
 	installBalancesWatch();
@@ -188,14 +160,14 @@ void Main::onKeysChanged()
 
 unsigned Main::installWatch(dev::eth::MessageFilter const& _tf, std::function<void()> const& _f)
 {
-	auto ret = m_client->installWatch(_tf);
+	auto ret = ethereum()->installWatch(_tf);
 	m_handlers[ret] = _f;
 	return ret;
 }
 
 unsigned Main::installWatch(dev::h256 _tf, std::function<void()> const& _f)
 {
-	auto ret = m_client->installWatch(_tf);
+	auto ret = ethereum()->installWatch(_tf);
 	m_handlers[ret] = _f;
 	return ret;
 }
@@ -209,14 +181,14 @@ void Main::installWatches()
 
 void Main::installNameRegWatch()
 {
-	m_client->uninstallWatch(m_nameRegFilter);
-	m_nameRegFilter = installWatch(dev::eth::MessageFilter().altered((u160)m_client->stateAt(c_config, 0)), [=](){ onNameRegChange(); });
+	ethereum()->uninstallWatch(m_nameRegFilter);
+	m_nameRegFilter = installWatch(dev::eth::MessageFilter().altered((u160)ethereum()->stateAt(c_config, 0)), [=](){ onNameRegChange(); });
 }
 
 void Main::installCurrenciesWatch()
 {
-	m_client->uninstallWatch(m_currenciesFilter);
-	m_currenciesFilter = installWatch(dev::eth::MessageFilter().altered((u160)m_client->stateAt(c_config, 1)), [=](){ onCurrenciesChange(); });
+	ethereum()->uninstallWatch(m_currenciesFilter);
+	m_currenciesFilter = installWatch(dev::eth::MessageFilter().altered((u160)ethereum()->stateAt(c_config, 1)), [=](){ onCurrenciesChange(); });
 }
 
 void Main::installBalancesWatch()
@@ -224,9 +196,9 @@ void Main::installBalancesWatch()
 	dev::eth::MessageFilter tf;
 
 	vector<Address> altCoins;
-	Address coinsAddr = right160(m_client->stateAt(c_config, 1));
-	for (unsigned i = 0; i < m_client->stateAt(coinsAddr, 0); ++i)
-		altCoins.push_back(right160(m_client->stateAt(coinsAddr, i + 1)));
+	Address coinsAddr = right160(ethereum()->stateAt(c_config, 1));
+	for (unsigned i = 0; i < ethereum()->stateAt(coinsAddr, 0); ++i)
+		altCoins.push_back(right160(ethereum()->stateAt(coinsAddr, i + 1)));
 	for (auto i: m_myKeys)
 	{
 		tf.altered(i.address());
@@ -234,7 +206,7 @@ void Main::installBalancesWatch()
 			tf.altered(c, (u160)i.address());
 	}
 
-	m_client->uninstallWatch(m_balancesFilter);
+	ethereum()->uninstallWatch(m_balancesFilter);
 	m_balancesFilter = installWatch(tf, [=](){ onBalancesChange(); });
 }
 
@@ -295,8 +267,8 @@ QString Main::pretty(dev::Address _a) const
 {
 	h256 n;
 
-	if (h160 nameReg = (u160)m_client->stateAt(c_config, 0))
-		n = m_client->stateAt(nameReg, (u160)(_a));
+	if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0))
+		n = ethereum()->stateAt(nameReg, (u160)(_a));
 
 	return fromRaw(n);
 }
@@ -322,8 +294,8 @@ Address Main::fromString(QString const& _a) const
 	memset(n.data() + sn.size(), 0, 32 - sn.size());
 	if (_a.size())
 	{
-		if (h160 nameReg = (u160)m_client->stateAt(c_config, 0))
-			if (h256 a = m_client->stateAt(nameReg, n))
+		if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0))
+			if (h256 a = ethereum()->stateAt(nameReg, n))
 				return right160(a);
 	}
 	if (_a.size() == 40)
@@ -351,11 +323,11 @@ QString Main::lookup(QString const& _a) const
 */
 
 	h256 ret;
-	if (h160 dnsReg = (u160)m_client->stateAt(c_config, 4, 0))
-		ret = m_client->stateAt(dnsReg, n);
+	if (h160 dnsReg = (u160)ethereum()->stateAt(c_config, 4, 0))
+		ret = ethereum()->stateAt(dnsReg, n);
 /*	if (!ret)
-		if (h160 nameReg = (u160)m_client->stateAt(c_config, 0, 0))
-			ret = m_client->stateAt(nameReg, n2);
+		if (h160 nameReg = (u160)ethereum()->stateAt(c_config, 0, 0))
+			ret = ethereum()->stateAt(nameReg, n2);
 */
 	if (ret && !((u256)ret >> 32))
 		return QString("%1.%2.%3.%4").arg((int)ret[28]).arg((int)ret[29]).arg((int)ret[30]).arg((int)ret[31]);
@@ -385,7 +357,7 @@ void Main::writeSettings()
 	s.setValue("address", b);
 	s.setValue("url", ui->urlEdit->text());
 
-	bytes d = m_client->savePeers();
+	bytes d = m_web3->savePeers();
 	if (d.size())
 		m_peers = QByteArray((char*)d.data(), (int)d.size());
 	s.setValue("peers", m_peers);
@@ -416,7 +388,7 @@ void Main::readSettings(bool _skipGeometry)
 				m_myKeys.append(KeyPair(k));
 		}
 	}
-	m_client->setAddress(m_myKeys.back().address());
+	ethereum()->setAddress(m_myKeys.back().address());
 	m_peers = s.value("peers").toByteArray();
 	ui->urlEdit->setText(s.value("url", "about:blank").toString());	//http://gavwood.com/gavcoin.html
 	on_urlEdit_returnPressed();
@@ -466,8 +438,8 @@ void Main::on_urlEdit_returnPressed()
 
 void Main::refreshMining()
 {
-	dev::eth::MineProgress p = m_client->miningProgress();
-	ui->mineStatus->setText(m_client->isMining() ? QString("%1s @ %2kH/s").arg(p.ms / 1000).arg(p.ms ? p.hashes / p.ms : 0) : "Not mining");
+	dev::eth::MineProgress p = ethereum()->miningProgress();
+	ui->mineStatus->setText(ethereum()->isMining() ? QString("%1s @ %2kH/s").arg(p.ms / 1000).arg(p.ms ? p.hashes / p.ms : 0) : "Not mining");
 }
 
 void Main::refreshBalances()
@@ -477,18 +449,18 @@ void Main::refreshBalances()
 	ui->ourAccounts->clear();
 	u256 totalBalance = 0;
 	map<Address, pair<QString, u256>> altCoins;
-	Address coinsAddr = right160(m_client->stateAt(c_config, 1));
-	for (unsigned i = 0; i < m_client->stateAt(coinsAddr, 0); ++i)
-		altCoins[right160(m_client->stateAt(coinsAddr, m_client->stateAt(coinsAddr, i + 1)))] = make_pair(fromRaw(m_client->stateAt(coinsAddr, i + 1)), 0);
+	Address coinsAddr = right160(ethereum()->stateAt(c_config, 1));
+	for (unsigned i = 0; i < ethereum()->stateAt(coinsAddr, 0); ++i)
+		altCoins[right160(ethereum()->stateAt(coinsAddr, ethereum()->stateAt(coinsAddr, i + 1)))] = make_pair(fromRaw(ethereum()->stateAt(coinsAddr, i + 1)), 0);
 	for (auto i: m_myKeys)
 	{
-		u256 b = m_client->balanceAt(i.address());
-		(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(b).c_str()).arg(render(i.address())).arg((unsigned)m_client->countAt(i.address())), ui->ourAccounts))
+		u256 b = ethereum()->balanceAt(i.address());
+		(new QListWidgetItem(QString("%2: %1 [%3]").arg(formatBalance(b).c_str()).arg(render(i.address())).arg((unsigned)ethereum()->countAt(i.address())), ui->ourAccounts))
 			->setData(Qt::UserRole, QByteArray((char const*)i.address().data(), Address::size));
 		totalBalance += b;
 
 		for (auto& c: altCoins)
-			c.second.second += (u256)m_client->stateAt(c.first, (u160)i.address());
+			c.second.second += (u256)ethereum()->stateAt(c.first, (u160)i.address());
 	}
 
 	QString b;
@@ -500,7 +472,7 @@ void Main::refreshBalances()
 
 void Main::refreshNetwork()
 {
-	auto ps = m_client->peers();
+	auto ps = m_web3->peers();
 
 	ui->peerCount->setText(QString::fromStdString(toString(ps.size())) + " peer(s)");
 }
@@ -514,8 +486,8 @@ void Main::refreshAll()
 void Main::refreshBlockCount()
 {
 	cwatch << "refreshBlockCount()";
-	auto d = m_client->blockChain().details();
-	auto diff = BlockInfo(m_client->blockChain().block()).difficulty;
+	auto d = ethereum()->blockChain().details();
+	auto diff = BlockInfo(ethereum()->blockChain().block()).difficulty;
 	ui->blockCount->setText(QString("#%1 @%3 T%2 N%4 D%5").arg(d.number).arg(toLog2(d.totalDifficulty)).arg(toLog2(diff)).arg(dev::eth::c_protocolVersion).arg(dev::eth::c_databaseVersion));
 }
 
@@ -543,7 +515,7 @@ void Main::timerEvent(QTimerEvent*)
 		m_ethereum->poll();
 
 	for (auto const& i: m_handlers)
-		if (m_client->checkWatch(i.first))
+		if (ethereum()->checkWatch(i.first))
 			i.second();
 }
 
@@ -574,7 +546,7 @@ void Main::ensureNetwork()
 {
 	string n = string("Third/v") + dev::Version;
 	n +=  "/" DEV_QUOTED(ETH_BUILD_TYPE) "/" DEV_QUOTED(ETH_BUILD_PLATFORM);
-	m_client->setClientVersion(n);
+	web3()->setClientVersion(n);
 
 	int pocnumber = QString(dev::Version).section('.', 1, 1).toInt();
 	string defPeer;
@@ -583,13 +555,16 @@ void Main::ensureNetwork()
 	else if (pocnumber == 6)
 		defPeer = "54.76.56.74";
 
-	if (!m_client->haveNetwork())
-		m_client->startNetwork(30303, defPeer);
+	if (!web3()->haveNetwork())
+	{
+		web3()->startNetwork();
+		web3()->connect(defPeer);
+	}
 	else
-		if (!m_client->peerCount())
-			m_client->connect(defPeer);
+		if (!m_web3->peerCount())
+			m_web3->connect(defPeer);
 	if (m_peers.size())
-		m_client->restorePeers(bytesConstRef((byte*)m_peers.data(), m_peers.size()));
+		m_web3->restorePeers(bytesConstRef((byte*)m_peers.data(), m_peers.size()));
 }
 
 void Main::on_connect_triggered()
@@ -600,7 +575,7 @@ void Main::on_connect_triggered()
 	{
 		string host = s.section(":", 0, 0).toStdString();
 		unsigned short port = s.section(":", 1).toInt();
-		m_client->connect(host, port);
+		web3()->connect(host, port);
 	}
 }
 
@@ -608,11 +583,11 @@ void Main::on_mine_triggered()
 {
 	if (ui->mine->isChecked())
 	{
-		m_client->setAddress(m_myKeys.last().address());
-		m_client->startMining();
+		ethereum()->setAddress(m_myKeys.last().address());
+		ethereum()->startMining();
 	}
 	else
-		m_client->stopMining();
+		ethereum()->stopMining();
 }
 
 // extra bits needed to link on VS
diff --git a/third/MainWin.h b/third/MainWin.h
index 76505d603..df05d6828 100644
--- a/third/MainWin.h
+++ b/third/MainWin.h
@@ -36,7 +36,8 @@ namespace Ui {
 class Main;
 }
 
-namespace dev { namespace eth {
+namespace dev { class WebThreeDirect;
+namespace eth {
 class Client;
 class State;
 class MessageFilter;
@@ -52,7 +53,8 @@ public:
 	explicit Main(QWidget *parent = 0);
 	~Main();
 
-	dev::eth::Client* client() { return m_client.get(); }
+	dev::WebThreeDirect* web3() const { return m_web3.get(); }
+	dev::eth::Client* ethereum() const;
 
 	QList<dev::KeyPair> const& owned() const { return m_myKeys; }
 	
@@ -111,7 +113,7 @@ private:
 
 	std::unique_ptr<Ui::Main> ui;
 
-	std::unique_ptr<dev::eth::Client> m_client;
+	std::unique_ptr<dev::WebThreeDirect> m_web3;
 
 	QList<dev::KeyPair> m_myKeys;
 
diff --git a/walleth/MainWin.cpp b/walleth/MainWin.cpp
index ade04c4fa..3fa5a9388 100644
--- a/walleth/MainWin.cpp
+++ b/walleth/MainWin.cpp
@@ -61,7 +61,7 @@ Main::Main(QWidget *parent) :
 
 	g_qmlMain = this;
 
-	m_client.reset(new Client("Walleth", Address(), dev::eth::getDataDir() + "/Walleth"));
+	m_client.reset(new Client("Walleth", Address(), dev::getDataDir() + "/Walleth"));
 	
 	g_qmlClient = m_client.get();
 
diff --git a/windows/Alethzero.vcxproj b/windows/Alethzero.vcxproj
index 721c0729e..d418e5d03 100644
--- a/windows/Alethzero.vcxproj
+++ b/windows/Alethzero.vcxproj
@@ -209,6 +209,24 @@
     </CustomBuild>
     <ClInclude Include="..\alethzero\Grapher.h" />
     <ClInclude Include="..\alethzero\GraphParameters.h" />
+    <CustomBuild Include="..\alethzero\DownloadView.h">
+      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(Lua) moc.lua "$(QtBin)/moc" "$(IntDir)moc_%(FileName).cpp" "@(ClCompile->'%(AdditionalIncludeDirectories)');$(IncludePath)" "@(ClCompile->'%(PreprocessorDefinitions)');_MSC_VER=1800" "%(FullPath)"</Command>
+      <Message Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+      </Message>
+      <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(Lua) moc.lua "$(QtBin)/moc" "$(IntDir)moc_%(FileName).cpp" "@(ClCompile->'%(AdditionalIncludeDirectories)');$(IncludePath)" "@(ClCompile->'%(PreprocessorDefinitions)');_MSC_VER=1800" "%(FullPath)"</Command>
+      <Message Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+      </Message>
+      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">$(Lua) moc.lua "$(QtBin)/moc" "$(IntDir)moc_%(FileName).cpp" "@(ClCompile->'%(AdditionalIncludeDirectories)');$(IncludePath)" "@(ClCompile->'%(PreprocessorDefinitions)');_MSC_VER=1800" "%(FullPath)"</Command>
+      <Message Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+      </Message>
+      <Command Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(Lua) moc.lua "$(QtBin)/moc" "$(IntDir)moc_%(FileName).cpp" "@(ClCompile->'%(AdditionalIncludeDirectories)');$(IncludePath)" "@(ClCompile->'%(PreprocessorDefinitions)');_MSC_VER=1800" "%(FullPath)"</Command>
+      <Message Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+      </Message>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(IntDir)moc_%(FileName).cpp</Outputs>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(IntDir)moc_%(FileName).cpp</Outputs>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">$(IntDir)moc_%(FileName).cpp</Outputs>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(IntDir)moc_%(FileName).cpp</Outputs>
+    </CustomBuild>
     <CustomBuild Include="..\alethzero\MiningView.h">
       <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(Lua) moc.lua "$(QtBin)/moc" "$(IntDir)moc_%(FileName).cpp" "@(ClCompile->'%(AdditionalIncludeDirectories)');$(IncludePath)" "@(ClCompile->'%(PreprocessorDefinitions)');_MSC_VER=1800" "%(FullPath)"</Command>
       <Message Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
@@ -289,4 +307,4 @@
     </ItemGroup>
     <Copy SourceFiles="@(CopyToBinDir)" DestinationFiles="@(CopyToBinDir->'..\..\_binaries\$(Platform)\%(RecursiveDir)%(Filename)%(Extension)')" />
   </Target>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/windows/Ethereum.sln b/windows/Ethereum.sln
index 6403d7fad..26fe794c2 100644
--- a/windows/Ethereum.sln
+++ b/windows/Ethereum.sln
@@ -23,8 +23,6 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LibMiniUPnPc", "LibMiniUPnP
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "AlethZero", "Alethzero.vcxproj", "{BFCFFC46-78A3-4350-9938-0EA3A2B1CCCD}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Walleth", "Walleth.vcxproj", "{326EF470-463F-4751-A22A-48BBAAD8B143}"
-EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LibQEthereum", "LibQEthereum.vcxproj", "{DF3C5B07-A1A2-4F16-B37F-A27333622CDD}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "eth", "Eth.vcxproj", "{C60C065C-2135-4B2B-AFD4-35FD7AC56B40}"
diff --git a/windows/LibEthereum.vcxproj b/windows/LibEthereum.vcxproj
index 196325353..134171843 100644
--- a/windows/LibEthereum.vcxproj
+++ b/windows/LibEthereum.vcxproj
@@ -527,4 +527,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/windows/LibEthereum.vcxproj.filters b/windows/LibEthereum.vcxproj.filters
index 5a650b0c5..b6e2dc070 100644
--- a/windows/LibEthereum.vcxproj.filters
+++ b/windows/LibEthereum.vcxproj.filters
@@ -175,6 +175,9 @@
     <ClCompile Include="..\libwhisper\WhisperPeer.cpp">
       <Filter>libwhisper</Filter>
     </ClCompile>
+    <ClCompile Include="..\libethereum\Manifest.cpp">
+      <Filter>libethereum</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="stdafx.h">
@@ -384,6 +387,9 @@
     <ClInclude Include="..\libwhisper\WhisperPeer.h">
       <Filter>libwhisper</Filter>
     </ClInclude>
+    <ClInclude Include="..\libethereum\Manifest.h">
+      <Filter>libethereum</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Windows">