diff --git a/alethzero/MainWin.cpp b/alethzero/MainWin.cpp
index e5506a660..fc27d6e30 100644
--- a/alethzero/MainWin.cpp
+++ b/alethzero/MainWin.cpp
@@ -1259,7 +1259,6 @@ void Main::on_blocks_currentItemChanged()
 			s << "<br/>D/TD: <b>2^" << log2((double)info.difficulty) << "</b>/<b>2^" << log2((double)details.totalDifficulty) << "</b>";
 			s << "&nbsp;&emsp;&nbsp;Children: <b>" << details.children.size() << "</b></h5>";
 			s << "<br/>Gas used/limit: <b>" << info.gasUsed << "</b>/<b>" << info.gasLimit << "</b>";
-			s << "&nbsp;&emsp;&nbsp;Minimum gas price: <b>" << formatBalance(info.minGasPrice) << "</b>";
 			s << "<br/>Coinbase: <b>" << pretty(info.coinbaseAddress).toHtmlEscaped().toStdString() << "</b> " << info.coinbaseAddress;
 			s << "<br/>Nonce: <b>" << info.nonce << "</b>";
 			s << "<br/>Parent: <b>" << info.parentHash << "</b>";
@@ -1665,7 +1664,7 @@ void Main::on_data_textChanged()
 				errs.append("<div style=\"border-left: 6px solid #c00; margin-top: 2px\">" + QString::fromStdString(i).toHtmlEscaped() + "</div>");
 		}
 		ui->code->setHtml(errs + lll + solidity + "<h4>Code</h4>" + QString::fromStdString(disassemble(m_data)).toHtmlEscaped());
-		ui->gas->setMinimum((qint64)Client::txGas(m_data.size(), 0));
+		ui->gas->setMinimum((qint64)Client::txGas(m_data, 0));
 		if (!ui->gas->isEnabled())
 			ui->gas->setValue(m_backupGas);
 		ui->gas->setEnabled(true);
@@ -1676,7 +1675,7 @@ void Main::on_data_textChanged()
 		ui->code->setHtml(QString::fromStdString(dev::memDump(m_data, 8, true)));
 		if (ethereum()->codeAt(fromString(ui->destination->currentText()), 0).size())
 		{
-			ui->gas->setMinimum((qint64)Client::txGas(m_data.size(), 1));
+			ui->gas->setMinimum((qint64)Client::txGas(m_data, 1));
 			if (!ui->gas->isEnabled())
 				ui->gas->setValue(m_backupGas);
 			ui->gas->setEnabled(true);
@@ -1685,7 +1684,7 @@ void Main::on_data_textChanged()
 		{
 			if (ui->gas->isEnabled())
 				m_backupGas = ui->gas->value();
-			ui->gas->setValue((qint64)Client::txGas(m_data.size()));
+			ui->gas->setValue((qint64)Client::txGas(m_data));
 			ui->gas->setEnabled(false);
 		}
 	}
diff --git a/eth/main.cpp b/eth/main.cpp
index 408654018..9b63e0643 100644
--- a/eth/main.cpp
+++ b/eth/main.cpp
@@ -492,14 +492,12 @@ int main(int argc, char** argv)
 					cnote << ssbd.str();
 					int ssize = sechex.length();
 					int size = hexAddr.length();
-					u256 minGas = (u256)Client::txGas(data.size(), 0);
+					u256 minGas = (u256)Client::txGas(data, 0);
 					if (size < 40)
 					{
 						if (size > 0)
 							cwarn << "Invalid address length:" << size;
 					}
-					else if (gasPrice < info.minGasPrice)
-						cwarn << "Minimum gas price is" << info.minGasPrice;
 					else if (gas < minGas)
 						cwarn << "Minimum gas amount is" << minGas;
 					else if (ssize < 40)
@@ -559,9 +557,9 @@ int main(int argc, char** argv)
 						auto h = bc.currentHash();
 						auto blockData = bc.block(h);
 						BlockInfo info(blockData);
-						u256 minGas = (u256)Client::txGas(0, 0);
+						u256 minGas = (u256)Client::txGas(bytes(), 0);
 						Address dest = h160(fromHex(hexAddr));
-						c->transact(us.secret(), amount, dest, bytes(), minGas, info.minGasPrice);
+						c->transact(us.secret(), amount, dest, bytes(), minGas);
 					}
 				} 
 				else
@@ -598,11 +596,9 @@ int main(int argc, char** argv)
 						cnote << "Init:";
 						cnote << ssc.str();
 					}
-					u256 minGas = (u256)Client::txGas(init.size(), 0);
+					u256 minGas = (u256)Client::txGas(init, 0);
 					if (endowment < 0)
 						cwarn << "Invalid endowment";
-					else if (gasPrice < info.minGasPrice)
-						cwarn << "Minimum gas price is" << info.minGasPrice;
 					else if (gas < minGas)
 						cwarn << "Minimum gas amount is" << minGas;
 					else
diff --git a/libdevcore/Common.cpp b/libdevcore/Common.cpp
index ae073b9b1..280268d8b 100644
--- a/libdevcore/Common.cpp
+++ b/libdevcore/Common.cpp
@@ -27,7 +27,7 @@ using namespace dev;
 namespace dev
 {
 
-char const* Version = "0.7.10";
+char const* Version = "0.7.11";
 
 }
 
diff --git a/libethcore/BlockInfo.cpp b/libethcore/BlockInfo.cpp
index 44da9603c..015f8dad6 100644
--- a/libethcore/BlockInfo.cpp
+++ b/libethcore/BlockInfo.cpp
@@ -58,9 +58,9 @@ h256 BlockInfo::headerHashWithoutNonce() const
 
 void BlockInfo::streamRLP(RLPStream& _s, bool _nonce) const
 {
-	_s.appendList(_nonce ? 15 : 14)
+	_s.appendList(_nonce ? 14 : 13)
 		<< parentHash << sha3Uncles << coinbaseAddress << stateRoot << transactionsRoot << receiptsRoot << logBloom
-		<< difficulty << number << minGasPrice << gasLimit << gasUsed << timestamp << extraData;
+		<< difficulty << number << gasLimit << gasUsed << timestamp << extraData;
 	if (_nonce)
 		_s << nonce;
 }
@@ -86,12 +86,11 @@ void BlockInfo::populateFromHeader(RLP const& _header, bool _checkNonce)
 		logBloom = _header[field = 6].toHash<h512>();
 		difficulty = _header[field = 7].toInt<u256>();
 		number = _header[field = 8].toInt<u256>();
-		minGasPrice = _header[field = 9].toInt<u256>();
-		gasLimit = _header[field = 10].toInt<u256>();
-		gasUsed = _header[field = 11].toInt<u256>();
-		timestamp = _header[field = 12].toInt<u256>();
-		extraData = _header[field = 13].toBytes();
-		nonce = _header[field = 14].toHash<h256>();
+		gasLimit = _header[field = 9].toInt<u256>();
+		gasUsed = _header[field = 10].toInt<u256>();
+		timestamp = _header[field = 11].toInt<u256>();
+		extraData = _header[field = 12].toBytes();
+		nonce = _header[field = 13].toHash<h256>();
 	}
 
 	catch (Exception const& _e)
@@ -147,9 +146,6 @@ void BlockInfo::verifyInternals(bytesConstRef _block) const
 	if (transactionsRoot != t.root())
 		BOOST_THROW_EXCEPTION(InvalidTransactionsHash(t.root(), transactionsRoot));
 
-	if (minGasPrice > mgp)
-		BOOST_THROW_EXCEPTION(InvalidMinGasPrice(minGasPrice, mgp));
-
 	if (sha3Uncles != sha3(root[2].data()))
 		BOOST_THROW_EXCEPTION(InvalidUnclesHash());
 }
diff --git a/libethcore/BlockInfo.h b/libethcore/BlockInfo.h
index d91ff244d..aa7456f72 100644
--- a/libethcore/BlockInfo.h
+++ b/libethcore/BlockInfo.h
@@ -66,7 +66,6 @@ public:
 	h512 logBloom;	// TODO LogBloom - get include
 	u256 difficulty;
 	u256 number;
-	u256 minGasPrice;
 	u256 gasLimit;
 	u256 gasUsed;
 	u256 timestamp;
@@ -95,7 +94,6 @@ public:
 				logBloom == _cmp.logBloom &&
 				difficulty == _cmp.difficulty &&
 				number == _cmp.number &&
-				minGasPrice == _cmp.minGasPrice &&
 				gasLimit == _cmp.gasLimit &&
 				gasUsed == _cmp.gasUsed &&
 				timestamp == _cmp.timestamp &&
@@ -122,7 +120,7 @@ public:
 inline std::ostream& operator<<(std::ostream& _out, BlockInfo const& _bi)
 {
 	_out << _bi.hash << " " << _bi.parentHash << " " << _bi.sha3Uncles << " " << _bi.coinbaseAddress << " " << _bi.stateRoot << " " << _bi.transactionsRoot << " " <<
-			_bi.receiptsRoot << " " << _bi.logBloom << " " << _bi.difficulty << " " << _bi.number << " " << _bi.minGasPrice << " " << _bi.gasLimit << " " <<
+			_bi.receiptsRoot << " " << _bi.logBloom << " " << _bi.difficulty << " " << _bi.number << " " << _bi.gasLimit << " " <<
 			_bi.gasUsed << " " << _bi.timestamp << " " << _bi.nonce;
 	return _out;
 }
diff --git a/libethcore/CommonEth.cpp b/libethcore/CommonEth.cpp
index c12c71774..010b7e408 100644
--- a/libethcore/CommonEth.cpp
+++ b/libethcore/CommonEth.cpp
@@ -33,8 +33,8 @@ namespace dev
 namespace eth
 {
 
-const unsigned c_protocolVersion = 44;
-const unsigned c_databaseVersion = 4;
+const unsigned c_protocolVersion = 45;
+const unsigned c_databaseVersion = 5;
 
 static const vector<pair<u256, string>> g_units =
 {
diff --git a/libethereum/BlockChain.cpp b/libethereum/BlockChain.cpp
index 765b54627..531005fb2 100644
--- a/libethereum/BlockChain.cpp
+++ b/libethereum/BlockChain.cpp
@@ -101,9 +101,8 @@ bytes BlockChain::createGenesisBlock()
 		stateRoot = state.root();
 	}
 
-	block.appendList(15)
-			// TODO: maybe make logbloom correct?
-		<< h256() << EmptyListSHA3 << h160() << stateRoot << EmptyTrie << EmptyTrie << LogBloom() << c_genesisDifficulty << 0 << 0 << 1000000 << 0 << (unsigned)0 << string() << sha3(bytes(1, 42));
+	block.appendList(14)
+		<< h256() << EmptyListSHA3 << h160() << stateRoot << EmptyTrie << EmptyTrie << LogBloom() << c_genesisDifficulty << 0 << 1000000 << 0 << (unsigned)0 << string() << sha3(bytes(1, 42));
 	block.appendRaw(RLPEmptyList);
 	block.appendRaw(RLPEmptyList);
 	return block.out();
@@ -169,8 +168,6 @@ void BlockChain::close()
 	delete m_db;
 	m_lastBlockHash = m_genesisHash;
 	m_details.clear();
-	m_blooms.clear();
-	m_traces.clear();
 	m_cache.clear();
 }
 
@@ -307,14 +304,10 @@ h256s BlockChain::import(bytes const& _block, OverlayDB const& _db)
 		State s(bi.coinbaseAddress, _db);
 		auto tdIncrease = s.enactOn(&_block, bi, *this);
 		auto b = s.oldBloom();
-		BlockBlooms bb;
-		BlockTraces bt;
 		BlockLogBlooms blb;
 		BlockReceipts br;
 		for (unsigned i = 0; i < s.pending().size(); ++i)
 		{
-			bb.blooms.push_back(s.changesFromPending(i).bloom());
-			bt.traces.push_back(s.changesFromPending(i));
 			blb.blooms.push_back(s.receipt(i).bloom());
 			br.receipts.push_back(s.receipt(i));
 		}
@@ -330,14 +323,6 @@ h256s BlockChain::import(bytes const& _block, OverlayDB const& _db)
 			m_details[newHash] = BlockDetails((unsigned)pd.number + 1, td, bi.parentHash, {}, b);
 			m_details[bi.parentHash].children.push_back(newHash);
 		}
-		{
-			WriteGuard l(x_blooms);
-			m_blooms[newHash] = bb;
-		}
-		{
-			WriteGuard l(x_traces);
-			m_traces[newHash] = bt;
-		}
 		{
 			WriteGuard l(x_logBlooms);
 			m_logBlooms[newHash] = blb;
@@ -349,8 +334,6 @@ h256s BlockChain::import(bytes const& _block, OverlayDB const& _db)
 
 		m_extrasDB->Put(m_writeOptions, toSlice(newHash), (ldb::Slice)dev::ref(m_details[newHash].rlp()));
 		m_extrasDB->Put(m_writeOptions, toSlice(bi.parentHash), (ldb::Slice)dev::ref(m_details[bi.parentHash].rlp()));
-		m_extrasDB->Put(m_writeOptions, toSlice(newHash, 1), (ldb::Slice)dev::ref(m_blooms[newHash].rlp()));
-		m_extrasDB->Put(m_writeOptions, toSlice(newHash, 2), (ldb::Slice)dev::ref(m_traces[newHash].rlp()));
 		m_extrasDB->Put(m_writeOptions, toSlice(newHash, 3), (ldb::Slice)dev::ref(m_logBlooms[newHash].rlp()));
 		m_extrasDB->Put(m_writeOptions, toSlice(newHash, 4), (ldb::Slice)dev::ref(m_receipts[newHash].rlp()));
 		m_db->Put(m_writeOptions, toSlice(newHash), (ldb::Slice)ref(_block));
diff --git a/libethereum/BlockChain.h b/libethereum/BlockChain.h
index 74d94e164..d03818bd3 100644
--- a/libethereum/BlockChain.h
+++ b/libethereum/BlockChain.h
@@ -101,14 +101,6 @@ public:
 	BlockDetails details(h256 _hash) const { return queryExtras<BlockDetails, 0>(_hash, m_details, x_details, NullBlockDetails); }
 	BlockDetails details() const { return details(currentHash()); }
 
-	/// Get the transactions' bloom filters of a block (or the most recent mined if none given). Thread-safe.
-	BlockBlooms blooms(h256 _hash) const { return queryExtras<BlockBlooms, 1>(_hash, m_blooms, x_blooms, NullBlockBlooms); }
-	BlockBlooms blooms() const { return blooms(currentHash()); }
-
-	/// Get the transactions' trace manifests of a block (or the most recent mined if none given). Thread-safe.
-	BlockTraces traces(h256 _hash) const { return queryExtras<BlockTraces, 2>(_hash, m_traces, x_traces, NullBlockTraces); }
-	BlockTraces traces() const { return traces(currentHash()); }
-
 	/// Get the transactions' log blooms of a block (or the most recent mined if none given). Thread-safe.
 	BlockLogBlooms logBlooms(h256 _hash) const { return queryExtras<BlockLogBlooms, 3>(_hash, m_logBlooms, x_logBlooms, NullBlockLogBlooms); }
 	BlockLogBlooms logBlooms() const { return logBlooms(currentHash()); }
@@ -193,10 +185,6 @@ private:
 	/// The caches of the disk DB and their locks.
 	mutable boost::shared_mutex x_details;
 	mutable BlockDetailsHash m_details;
-	mutable boost::shared_mutex x_blooms;
-	mutable BlockBloomsHash m_blooms;
-	mutable boost::shared_mutex x_traces;
-	mutable BlockTracesHash m_traces;
 	mutable boost::shared_mutex x_logBlooms;
 	mutable BlockLogBloomsHash m_logBlooms;
 	mutable boost::shared_mutex x_receipts;
diff --git a/libethereum/BlockDetails.h b/libethereum/BlockDetails.h
index 973e93070..0c3af5b33 100644
--- a/libethereum/BlockDetails.h
+++ b/libethereum/BlockDetails.h
@@ -54,24 +54,6 @@ struct BlockDetails
 	h256 bloom;
 };
 
-struct BlockBlooms
-{
-	BlockBlooms() {}
-	BlockBlooms(RLP const& _r) { blooms = _r.toVector<h256>(); }
-	bytes rlp() const { RLPStream s; s << blooms; return s.out(); }
-
-	h256s blooms;
-};
-
-struct BlockTraces
-{
-	BlockTraces() {}
-	BlockTraces(RLP const& _r) { for (auto const& i: _r) traces.emplace_back(i.data()); }
-	bytes rlp() const { RLPStream s(traces.size()); for (auto const& i: traces) i.streamRLP(s); return s.out(); }
-
-	Manifests traces;
-};
-
 struct BlockLogBlooms
 {
 	BlockLogBlooms() {}
@@ -91,14 +73,10 @@ struct BlockReceipts
 };
 
 typedef std::map<h256, BlockDetails> BlockDetailsHash;
-typedef std::map<h256, BlockBlooms> BlockBloomsHash;
-typedef std::map<h256, BlockTraces> BlockTracesHash;
 typedef std::map<h256, BlockLogBlooms> BlockLogBloomsHash;
 typedef std::map<h256, BlockReceipts> BlockReceiptsHash;
 
 static const BlockDetails NullBlockDetails;
-static const BlockBlooms NullBlockBlooms;
-static const BlockTraces NullBlockTraces;
 static const BlockLogBlooms NullBlockLogBlooms;
 static const BlockReceipts NullBlockReceipts;
 
diff --git a/libethereum/Executive.cpp b/libethereum/Executive.cpp
index 87e675e15..42c063d3f 100644
--- a/libethereum/Executive.cpp
+++ b/libethereum/Executive.cpp
@@ -22,6 +22,7 @@
 #include <boost/timer.hpp>
 #include <libdevcore/CommonIO.h>
 #include <libevm/VM.h>
+#include "Interface.h"
 #include "Executive.h"
 #include "State.h"
 #include "ExtVM.h"
@@ -58,15 +59,8 @@ bool Executive::setup(bytesConstRef _rlp)
 		BOOST_THROW_EXCEPTION(InvalidNonce(nonceReq, m_t.nonce()));
 	}
 
-	// Don't like transactions whose gas price is too low. NOTE: this won't stay here forever - it's just until we get a proper gas price discovery protocol going.
-	if (m_t.gasPrice() < m_s.m_currentBlock.minGasPrice)
-	{
-		clog(StateDetail) << "Offered gas-price is too low: Require >" << m_s.m_currentBlock.minGasPrice << " Got" << m_t.gasPrice();
-		BOOST_THROW_EXCEPTION(GasPriceTooLow());
-	}
-
 	// Check gas cost is enough.
-	u256 gasCost = m_t.data().size() * c_txDataGas + c_txGas;
+	auto gasCost = Interface::txGas(m_t.data());
 
 	if (m_t.gas() < gasCost)
 	{
@@ -106,9 +100,9 @@ bool Executive::setup(bytesConstRef _rlp)
 	}
 
 	if (m_t.isCreation())
-		return create(m_sender, m_t.value(), m_t.gasPrice(), m_t.gas() - gasCost, &m_t.data(), m_sender);
+		return create(m_sender, m_t.value(), m_t.gasPrice(), m_t.gas() - (u256)gasCost, &m_t.data(), m_sender);
 	else
-		return call(m_t.receiveAddress(), m_sender, m_t.value(), m_t.gasPrice(), bytesConstRef(&m_t.data()), m_t.gas() - gasCost, m_sender);
+		return call(m_t.receiveAddress(), m_sender, m_t.value(), m_t.gasPrice(), bytesConstRef(&m_t.data()), m_t.gas() - (u256)gasCost, m_sender);
 }
 
 bool Executive::call(Address _receiveAddress, Address _senderAddress, u256 _value, u256 _gasPrice, bytesConstRef _data, u256 _gas, Address _originAddress)
diff --git a/libethereum/Interface.h b/libethereum/Interface.h
index add9a1bda..d598e1f9b 100644
--- a/libethereum/Interface.h
+++ b/libethereum/Interface.h
@@ -128,7 +128,7 @@ public:
 	virtual Addresses addresses(int _block) const = 0;
 
 	/// Get the fee associated for a transaction with the given data.
-	static u256 txGas(unsigned _dataCount, u256 _gas = 0) { return c_txDataGas * _dataCount + c_txGas + _gas; }
+	template <class T> static bigint txGas(T const& _data, u256 _gas = 0) { bigint ret = c_txGas + _gas; for (auto i: _data) ret += i ? c_txDataNonZeroGas : c_txDataZeroGas; return ret; }
 
 	/// Get the remaining gas limit in this block.
 	virtual u256 gasLimitRemaining() const = 0;
diff --git a/libethereum/State.cpp b/libethereum/State.cpp
index 4f0a4ae3c..66d24a27b 100644
--- a/libethereum/State.cpp
+++ b/libethereum/State.cpp
@@ -54,7 +54,7 @@ void ecrecoverCode(bytesConstRef _in, bytesRef _out)
 	memcpy(&in, _in.data(), min(_in.size(), sizeof(in)));
 
 	memset(_out.data(), 0, _out.size());
-	if (in.v > 28)
+	if ((u256)in.v > 28)
 		return;
 	SignatureStruct sig{in.r, in.s, (byte)((int)(u256)in.v - 27)};
 	if (!sig.isValid())
@@ -503,7 +503,6 @@ void State::resetCurrent()
 	m_currentBlock.timestamp = time(0);
 	m_currentBlock.transactionsRoot = h256();
 	m_currentBlock.sha3Uncles = h256();
-	m_currentBlock.minGasPrice = 10 * szabo;
 	m_currentBlock.populateFromParent(m_previousBlock);
 
 	// Update timestamp according to clock.
diff --git a/libevm/FeeStructure.cpp b/libevm/FeeStructure.cpp
index 6d868cac5..3e957118e 100644
--- a/libevm/FeeStructure.cpp
+++ b/libevm/FeeStructure.cpp
@@ -34,9 +34,13 @@ u256 const dev::eth::c_sstoreResetGas = 100;
 u256 const dev::eth::c_sstoreRefundGas = 100;
 u256 const dev::eth::c_createGas = 100;
 u256 const dev::eth::c_callGas = 20;
+u256 const dev::eth::c_expGas = 1;
+u256 const dev::eth::c_expByteGas = 1;
 u256 const dev::eth::c_memoryGas = 1;
-u256 const dev::eth::c_txDataGas = 5;
+u256 const dev::eth::c_txDataZeroGas = 1;
+u256 const dev::eth::c_txDataNonZeroGas = 5;
 u256 const dev::eth::c_txGas = 500;
 u256 const dev::eth::c_logGas = 32;
 u256 const dev::eth::c_logDataGas = 1;
 u256 const dev::eth::c_logTopicGas = 32;
+u256 const dev::eth::c_copyGas = 1;
diff --git a/libevm/FeeStructure.h b/libevm/FeeStructure.h
index e57f7ccf8..3fb8175e6 100644
--- a/libevm/FeeStructure.h
+++ b/libevm/FeeStructure.h
@@ -37,12 +37,16 @@ extern u256 const c_sstoreResetGas;		///< Once per SSTORE operation if the zeron
 extern u256 const c_sstoreRefundGas;	///< Refunded gas, once per SSTORE operation if the zeroness changes to zero.
 extern u256 const c_createGas;			///< Once per CREATE operation & contract-creation transaction.
 extern u256 const c_callGas;			///< Once per CALL operation & message call transaction.
+extern u256 const c_expGas;				///< Once per EXP instuction.
+extern u256 const c_expByteGas;			///< Times ceil(log256(exponent)) for the EXP instruction.
 extern u256 const c_memoryGas;			///< Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
-extern u256 const c_txDataGas;			///< Per byte of data attached to a transaction. NOTE: Not payable on data of calls between transactions.
+extern u256 const c_txDataZeroGas;		///< Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions.
+extern u256 const c_txDataNonZeroGas;	///< Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions.
 extern u256 const c_txGas;				///< Per transaction. NOTE: Not payable on data of calls between transactions.
 extern u256 const c_logGas;				///< Per LOG* operation.
 extern u256 const c_logDataGas;			///< Per byte in a LOG* operation's data.
 extern u256 const c_logTopicGas;		///< Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
+extern u256 const c_copyGas;			///< Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
 
 }
 }
diff --git a/libevm/VM.h b/libevm/VM.h
index f39bc9d4f..951603ab2 100644
--- a/libevm/VM.h
+++ b/libevm/VM.h
@@ -110,6 +110,7 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
 		// FEES...
 		bigint runGas = c_stepGas;
 		bigint newTempSize = m_temp.size();
+		bigint copySize = 0;
 
 		auto onOperation = [&]()
 		{
@@ -172,14 +173,17 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
 			break;
 		case Instruction::CALLDATACOPY:
 			require(3);
+			copySize = m_stack[m_stack.size() - 3];
 			newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 3]);
 			break;
 		case Instruction::CODECOPY:
 			require(3);
+			copySize = m_stack[m_stack.size() - 3];
 			newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 3]);
 			break;
 		case Instruction::EXTCODECOPY:
 			require(4);
+			copySize = m_stack[m_stack.size() - 4];
 			newTempSize = memNeed(m_stack[m_stack.size() - 2], m_stack[m_stack.size() - 4]);
 			break;
 			
@@ -217,6 +221,13 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
             runGas = c_createGas;
 			break;
 		}
+		case Instruction::EXP:
+		{
+			require(2);
+			auto expon = m_stack[m_stack.size() - 2];
+			runGas = c_expGas + c_expByteGas * (32 - (h256(expon).firstBitSet() / 8));
+			break;
+		}
 
 		case Instruction::PC:
 		case Instruction::MSIZE:
@@ -283,7 +294,6 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
 		case Instruction::SDIV:
 		case Instruction::MOD:
 		case Instruction::SMOD:
-		case Instruction::EXP:
 		case Instruction::LT:
 		case Instruction::GT:
 		case Instruction::SLT:
@@ -344,6 +354,7 @@ template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc con
 		newTempSize = (newTempSize + 31) / 32 * 32;
 		if (newTempSize > m_temp.size())
 			runGas += c_memoryGas * (newTempSize - m_temp.size()) / 32;
+		runGas += c_copyGas * (copySize + 31) / 32;
 
 		onOperation();
 //		if (_onOp)
diff --git a/libevmjit/interface.c b/libevmjit/interface.c
new file mode 100644
index 000000000..47589578b
--- /dev/null
+++ b/libevmjit/interface.c
@@ -0,0 +1,30 @@
+#include <stdint.h>
+
+// JIT object opaque type
+typedef struct evm_jit evm_jit;
+
+// Contract execution return code
+typedef int evm_jit_return_code;
+
+// Host-endian 256-bit integer type
+typedef struct i256 i256;
+
+// Big-endian right aligned 256-bit hash
+typedef struct h256 h256;
+
+// Runtime data struct - must be provided by external language (Go, C++, Python)
+typedef struct evm_jit_rt evm_jit_rt;
+
+// Runtime callback functions  - implementations must be provided by external language (Go, C++, Python)
+void evm_jit_rt_sload(evm_jit_rt* _rt, i256* _index, i256* _ret);
+void evm_jit_rt_sstore(evm_jit_rt* _rt, i256* _index, i256* _value);
+void evm_jit_rt_balance(evm_jit_rt* _rt, h256* _address, i256* _ret);
+// And so on...
+
+evm_jit* evm_jit_create(evm_jit_rt* _runtime_data);
+
+evm_jit_return_code evm_jit_execute(evm_jit* _jit);
+
+void evm_jit_get_return_data(evm_jit* _jit, char* _return_data_offset, size_t* _return_data_size);
+
+void evm_jit_destroy(evm_jit* _jit);
diff --git a/libp2p/Host.cpp b/libp2p/Host.cpp
index 6e151d34d..b233fe552 100644
--- a/libp2p/Host.cpp
+++ b/libp2p/Host.cpp
@@ -78,7 +78,7 @@ std::vector<bi::address> Host::getInterfaceAddresses()
 		char *addrStr = inet_ntoa(addr);
 		bi::address address(bi::address::from_string(addrStr));
 		if (!isLocalHostAddress(address))
-			addresses.push_back(ad.to_v4());
+			addresses.push_back(address.to_v4());
 	}
 	
 	WSACleanup();
@@ -153,7 +153,7 @@ int Host::listen4(bi::tcp::acceptor* _acceptor, unsigned short _listenPort)
 
 bi::tcp::endpoint Host::traverseNAT(std::vector<bi::address> const& _ifAddresses, unsigned short _listenPort, bi::address& o_upnpifaddr)
 {
-	asserts(_listenPort);
+	asserts(_listenPort != 0);
 	
 	UPnP* upnp;
 	try
diff --git a/libsolidity/AST.h b/libsolidity/AST.h
index 3fb251d95..81a12ad1a 100644
--- a/libsolidity/AST.h
+++ b/libsolidity/AST.h
@@ -173,14 +173,21 @@ private:
 class FunctionDefinition: public Declaration
 {
 public:
-	FunctionDefinition(Location const& _location, ASTPointer<ASTString> const& _name, bool _isPublic,
-					   ASTPointer<ParameterList> const& _parameters,
-					   bool _isDeclaredConst,
-					   ASTPointer<ParameterList> const& _returnParameters,
-					   ASTPointer<Block> const& _body):
-		Declaration(_location, _name), m_isPublic(_isPublic), m_parameters(_parameters),
-		m_isDeclaredConst(_isDeclaredConst), m_returnParameters(_returnParameters),
-		m_body(_body) {}
+	FunctionDefinition(Location const& _location, ASTPointer<ASTString> const& _name,
+					bool _isPublic,
+					ASTPointer<ASTString> const& _documentation,
+					ASTPointer<ParameterList> const& _parameters,
+					bool _isDeclaredConst,
+					ASTPointer<ParameterList> const& _returnParameters,
+					ASTPointer<Block> const& _body):
+	Declaration(_location, _name), m_isPublic(_isPublic),
+	m_parameters(_parameters),
+	m_isDeclaredConst(_isDeclaredConst),
+	m_returnParameters(_returnParameters),
+	m_body(_body),
+	m_documentation(_documentation)
+	{}
+
 	virtual void accept(ASTVisitor& _visitor) override;
 
 	bool isPublic() const { return m_isPublic; }
@@ -190,6 +197,9 @@ public:
 	std::vector<ASTPointer<VariableDeclaration>> const& getReturnParameters() const { return m_returnParameters->getParameters(); }
 	ASTPointer<ParameterList> const& getReturnParameterList() const { return m_returnParameters; }
 	Block& getBody() { return *m_body; }
+	/// @return A shared pointer of an ASTString.
+	/// Can contain a nullptr in which case indicates absence of documentation
+	ASTPointer<ASTString> const& getDocumentation() { return m_documentation; }
 
 	void addLocalVariable(VariableDeclaration const& _localVariable) { m_localVariables.push_back(&_localVariable); }
 	std::vector<VariableDeclaration const*> const& getLocalVariables() const { return m_localVariables; }
@@ -203,6 +213,7 @@ private:
 	bool m_isDeclaredConst;
 	ASTPointer<ParameterList> m_returnParameters;
 	ASTPointer<Block> m_body;
+	ASTPointer<ASTString> m_documentation;
 
 	std::vector<VariableDeclaration const*> m_localVariables;
 };
diff --git a/libsolidity/ExpressionCompiler.cpp b/libsolidity/ExpressionCompiler.cpp
index 4dc377791..c3c7116e4 100644
--- a/libsolidity/ExpressionCompiler.cpp
+++ b/libsolidity/ExpressionCompiler.cpp
@@ -363,7 +363,7 @@ void ExpressionCompiler::endVisit(Identifier& _identifier)
 		m_context << m_context.getFunctionEntryLabel(*functionDef).pushTag();
 		return;
 	}
-	if (VariableDeclaration* varDef = dynamic_cast<VariableDeclaration*>(declaration))
+	if (/*VariableDeclaration* varDef = */dynamic_cast<VariableDeclaration*>(declaration))
 	{
 		m_currentLValue.fromIdentifier(_identifier, *_identifier.getReferencedDeclaration());
 		m_currentLValue.retrieveValueIfLValueNotRequested(_identifier);
diff --git a/libsolidity/GlobalContext.cpp b/libsolidity/GlobalContext.cpp
index e958352fd..d8b637076 100644
--- a/libsolidity/GlobalContext.cpp
+++ b/libsolidity/GlobalContext.cpp
@@ -58,7 +58,7 @@ GlobalContext::GlobalContext():
 													  FunctionType::Location::ECRECOVER)),
 					 make_shared<MagicVariableDeclaration>("ripemd160",
 							make_shared<FunctionType>(TypePointers({std::make_shared<IntegerType>(256, IntegerType::Modifier::HASH)}),
-													  TypePointers({std::make_shared<IntegerType>(256, IntegerType::Modifier::HASH)}),
+													  TypePointers({std::make_shared<IntegerType>(160, IntegerType::Modifier::HASH)}),
 													  FunctionType::Location::RIPEMD160))}
 {
 }
diff --git a/libsolidity/Parser.cpp b/libsolidity/Parser.cpp
index 276da0728..0506bc3e3 100644
--- a/libsolidity/Parser.cpp
+++ b/libsolidity/Parser.cpp
@@ -117,6 +117,10 @@ ASTPointer<ContractDefinition> Parser::parseContractDefinition()
 ASTPointer<FunctionDefinition> Parser::parseFunctionDefinition(bool _isPublic)
 {
 	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<ASTString> docstring;
+	if (m_scanner->getCurrentCommentLiteral() != "")
+		docstring = std::make_shared<ASTString>(m_scanner->getCurrentCommentLiteral());
+
 	expectToken(Token::FUNCTION);
 	ASTPointer<ASTString> name(expectIdentifierToken());
 	ASTPointer<ParameterList> parameters(parseParameterList());
@@ -142,8 +146,9 @@ ASTPointer<FunctionDefinition> Parser::parseFunctionDefinition(bool _isPublic)
 	}
 	ASTPointer<Block> block = parseBlock();
 	nodeFactory.setEndPositionFromNode(block);
-	return nodeFactory.createNode<FunctionDefinition>(name, _isPublic, parameters,
-			isDeclaredConst, returnParameters, block);
+	return nodeFactory.createNode<FunctionDefinition>(name, _isPublic, docstring,
+													  parameters,
+													  isDeclaredConst, returnParameters, block);
 }
 
 ASTPointer<StructDefinition> Parser::parseStructDefinition()
diff --git a/libsolidity/Scanner.cpp b/libsolidity/Scanner.cpp
index dd18a320f..4ffc2223f 100644
--- a/libsolidity/Scanner.cpp
+++ b/libsolidity/Scanner.cpp
@@ -102,18 +102,55 @@ int hexValue(char c)
 }
 } // end anonymous namespace
 
+
+
+/// Scoped helper for literal recording. Automatically drops the literal
+/// if aborting the scanning before it's complete.
+enum LiteralType {
+	LITERAL_TYPE_STRING,
+	LITERAL_TYPE_NUMBER, // not really different from string type in behaviour
+	LITERAL_TYPE_COMMENT
+};
+
+class LiteralScope
+{
+public:
+	explicit LiteralScope(Scanner* _self, enum LiteralType _type): m_type(_type)
+	, m_scanner(_self)
+	, m_complete(false)
+	{
+		if (_type == LITERAL_TYPE_COMMENT)
+			m_scanner->m_nextSkippedComment.literal.clear();
+		else
+			m_scanner->m_nextToken.literal.clear();
+	}
+	~LiteralScope()
+	{
+		if (!m_complete)
+		{
+			if (m_type == LITERAL_TYPE_COMMENT)
+				m_scanner->m_nextSkippedComment.literal.clear();
+			else
+				m_scanner->m_nextToken.literal.clear();
+		}
+	}
+	void complete() { m_complete = true; }
+
+private:
+	enum LiteralType m_type;
+	Scanner* m_scanner;
+	bool m_complete;
+}; // end of LiteralScope class
+
+
 void Scanner::reset(CharStream const& _source)
 {
-	bool foundDocComment;
 	m_source = _source;
 	m_char = m_source.get();
 	skipWhitespace();
-	foundDocComment = scanToken();
+	scanToken();
 
-	// special version of Scanner:next() taking the previous scanToken() result into account
-	m_currentToken = m_nextToken;
-	if (scanToken() || foundDocComment)
-		m_skippedComment = m_nextSkippedComment;
+	next();
 }
 
 
@@ -142,8 +179,9 @@ BOOST_STATIC_ASSERT(Token::NUM_TOKENS <= 0x100);
 Token::Value Scanner::next()
 {
 	m_currentToken = m_nextToken;
-	if (scanToken())
-		m_skippedComment = m_nextSkippedComment;
+	m_skippedComment = m_nextSkippedComment;
+	scanToken();
+
 	return m_currentToken.token;
 }
 
@@ -180,10 +218,26 @@ Token::Value Scanner::skipSingleLineComment()
 /// For the moment this function simply consumes a single line triple slash doc comment
 Token::Value Scanner::scanDocumentationComment()
 {
-	LiteralScope literal(this);
+	LiteralScope literal(this, LITERAL_TYPE_COMMENT);
 	advance(); //consume the last '/'
-	while (!isSourcePastEndOfInput() && !isLineTerminator(m_char))
+	while (!isSourcePastEndOfInput())
 	{
+		if (isLineTerminator(m_char))
+		{
+			// check if next line is also a documentation comment
+			skipWhitespace();
+			if (!m_source.isPastEndOfInput(3) &&
+				m_source.get(0) == '/' &&
+				m_source.get(1) == '/' &&
+				m_source.get(2) == '/')
+			{
+				addCommentLiteralChar('\n');
+				m_char = m_source.advanceAndGet(3);
+			}
+			else
+				break; // next line is not a documentation comment, we are done
+
+		}
 		addCommentLiteralChar(m_char);
 		advance();
 	}
@@ -214,10 +268,10 @@ Token::Value Scanner::skipMultiLineComment()
 	return Token::ILLEGAL;
 }
 
-bool Scanner::scanToken()
+void Scanner::scanToken()
 {
-	bool foundDocComment = false;
 	m_nextToken.literal.clear();
+	m_nextSkippedComment.literal.clear();
 	Token::Value token;
 	do
 	{
@@ -329,7 +383,6 @@ bool Scanner::scanToken()
 					m_nextSkippedComment.location.end = getSourcePos();
 					m_nextSkippedComment.token = comment;
 					token = Token::WHITESPACE;
-					foundDocComment = true;
 				}
 				else
 					token = skipSingleLineComment();
@@ -425,8 +478,6 @@ bool Scanner::scanToken()
 	while (token == Token::WHITESPACE);
 	m_nextToken.location.end = getSourcePos();
 	m_nextToken.token = token;
-
-	return foundDocComment;
 }
 
 bool Scanner::scanEscape()
@@ -474,7 +525,7 @@ Token::Value Scanner::scanString()
 {
 	char const quote = m_char;
 	advance();  // consume quote
-	LiteralScope literal(this);
+	LiteralScope literal(this, LITERAL_TYPE_STRING);
 	while (m_char != quote && !isSourcePastEndOfInput() && !isLineTerminator(m_char))
 	{
 		char c = m_char;
@@ -505,7 +556,7 @@ void Scanner::scanDecimalDigits()
 Token::Value Scanner::scanNumber(char _charSeen)
 {
 	enum { DECIMAL, HEX, BINARY } kind = DECIMAL;
-	LiteralScope literal(this);
+	LiteralScope literal(this, LITERAL_TYPE_NUMBER);
 	if (_charSeen == '.')
 	{
 		// we have already seen a decimal point of the float
@@ -758,7 +809,7 @@ Token::Value Scanner::scanIdentifierOrKeyword()
 {
 	if (asserts(isIdentifierStart(m_char)))
 		BOOST_THROW_EXCEPTION(InternalCompilerError());
-	LiteralScope literal(this);
+	LiteralScope literal(this, LITERAL_TYPE_STRING);
 	addLiteralCharAndAdvance();
 	// Scan the rest of the identifier characters.
 	while (isIdentifierPart(m_char))
@@ -767,14 +818,14 @@ Token::Value Scanner::scanIdentifierOrKeyword()
 	return KeywordOrIdentifierToken(m_nextToken.literal);
 }
 
-char CharStream::advanceAndGet()
+char CharStream::advanceAndGet(size_t _chars)
 {
 	if (isPastEndOfInput())
 		return 0;
-	++m_pos;
+	m_pos += _chars;
 	if (isPastEndOfInput())
 		return 0;
-	return get();
+	return m_source[m_pos];
 }
 
 char CharStream::rollback(size_t _amount)
diff --git a/libsolidity/Scanner.h b/libsolidity/Scanner.h
index 957f02b1f..49ac3651c 100644
--- a/libsolidity/Scanner.h
+++ b/libsolidity/Scanner.h
@@ -74,9 +74,9 @@ public:
 	CharStream(): m_pos(0) {}
 	explicit CharStream(std::string const& _source): m_source(_source), m_pos(0) {}
 	int getPos() const { return m_pos; }
-	bool isPastEndOfInput() const { return m_pos >= m_source.size(); }
-	char get() const { return m_source[m_pos]; }
-	char advanceAndGet();
+	bool isPastEndOfInput(size_t _charsForward = 0) const { return (m_pos + _charsForward) >= m_source.size(); }
+	char get(size_t _charsForward = 0) const { return m_source[m_pos + _charsForward]; }
+	char advanceAndGet(size_t _chars=1);
 	char rollback(size_t _amount);
 
 	///@{
@@ -93,22 +93,11 @@ private:
 };
 
 
+
 class Scanner
 {
+	friend class LiteralScope;
 public:
-	/// Scoped helper for literal recording. Automatically drops the literal
-	/// if aborting the scanning before it's complete.
-	class LiteralScope
-	{
-	public:
-		explicit LiteralScope(Scanner* self): m_scanner(self), m_complete(false) { m_scanner->startNewLiteral(); }
-		~LiteralScope() { if (!m_complete) m_scanner->dropLiteral(); }
-		void complete() { m_complete = true; }
-
-	private:
-		Scanner* m_scanner;
-		bool m_complete;
-	};
 
 	Scanner() { reset(CharStream()); }
 	explicit Scanner(CharStream const& _source) { reset(_source); }
@@ -133,8 +122,12 @@ public:
 
 	///@{
 	///@name Information about the current comment token
+
 	Location getCurrentCommentLocation() const { return m_skippedComment.location; }
 	std::string const& getCurrentCommentLiteral() const { return m_skippedComment.literal; }
+	/// Called by the parser during FunctionDefinition parsing to clear the current comment
+	void clearCurrentCommentLiteral() { m_skippedComment.literal.clear(); }
+
 	///@}
 
 	///@{
@@ -165,10 +158,8 @@ private:
 
 	///@{
 	///@name Literal buffer support
-	inline void startNewLiteral() { m_nextToken.literal.clear(); }
 	inline void addLiteralChar(char c) { m_nextToken.literal.push_back(c); }
 	inline void addCommentLiteralChar(char c) { m_nextSkippedComment.literal.push_back(c); }
-	inline void dropLiteral() { m_nextToken.literal.clear(); }
 	inline void addLiteralCharAndAdvance() { addLiteralChar(m_char); advance(); }
 	///@}
 
@@ -181,9 +172,8 @@ private:
 
 	bool scanHexByte(char& o_scannedByte);
 
-	/// Scans a single Solidity token. Returns true if the scanned token was
-	/// a skipped documentation comment. False in all other cases.
-	bool scanToken();
+	/// Scans a single Solidity token.
+	void scanToken();
 
 	/// Skips all whitespace and @returns true if something was skipped.
 	bool skipWhitespace();
diff --git a/libsolidity/Types.cpp b/libsolidity/Types.cpp
index 4ab53bf86..b81fbbe31 100644
--- a/libsolidity/Types.cpp
+++ b/libsolidity/Types.cpp
@@ -397,11 +397,11 @@ MagicType::MagicType(MagicType::Kind _kind):
 		break;
 	case Kind::MSG:
 		m_members = MemberList({{"sender", make_shared<IntegerType const>(0, IntegerType::Modifier::ADDRESS)},
+								{"gas", make_shared<IntegerType const>(256)},
 								{"value", make_shared<IntegerType const>(256)}});
 		break;
 	case Kind::TX:
 		m_members = MemberList({{"origin", make_shared<IntegerType const>(0, IntegerType::Modifier::ADDRESS)},
-								{"gas", make_shared<IntegerType const>(256)},
 								{"gasprice", make_shared<IntegerType const>(256)}});
 		break;
 	default:
diff --git a/libweb3jsonrpc/WebThreeStubServer.cpp b/libweb3jsonrpc/WebThreeStubServer.cpp
index 8ee9ee722..7607b7a95 100644
--- a/libweb3jsonrpc/WebThreeStubServer.cpp
+++ b/libweb3jsonrpc/WebThreeStubServer.cpp
@@ -51,7 +51,6 @@ static Json::Value toJson(dev::eth::BlockInfo const& _bi)
 	res["transactionsRoot"] = toJS(_bi.transactionsRoot);
 	res["difficulty"] = toJS(_bi.difficulty);
 	res["number"] = (int)_bi.number;
-	res["minGasPrice"] = toJS(_bi.minGasPrice);
 	res["gasLimit"] = (int)_bi.gasLimit;
 	res["timestamp"] = (int)_bi.timestamp;
 	res["extraData"] = jsFromBinary(_bi.extraData);
diff --git a/libwhisper/WhisperHost.cpp b/libwhisper/WhisperHost.cpp
index 0fb7a206c..9b26e3260 100644
--- a/libwhisper/WhisperHost.cpp
+++ b/libwhisper/WhisperHost.cpp
@@ -156,6 +156,12 @@ void WhisperHost::uninstallWatch(unsigned _i)
 			m_filters.erase(fit);
 }
 
+void WhisperHost::doWork()
+{
+	for (auto& i: peers())
+		i->cap<WhisperPeer>()->sendMessages();
+}
+
 void WhisperHost::cleanup()
 {
 	// remove old messages.
diff --git a/libwhisper/WhisperHost.h b/libwhisper/WhisperHost.h
index 91934dd98..b38964f8e 100644
--- a/libwhisper/WhisperHost.h
+++ b/libwhisper/WhisperHost.h
@@ -27,6 +27,7 @@
 #include <memory>
 #include <utility>
 #include <libdevcore/RLP.h>
+#include <libdevcore/Worker.h>
 #include <libdevcore/Guards.h>
 #include <libdevcrypto/SHA3.h>
 #include "Common.h"
@@ -38,7 +39,7 @@ namespace dev
 namespace shh
 {
 
-class WhisperHost: public HostCapability<WhisperPeer>, public Interface
+class WhisperHost: public HostCapability<WhisperPeer>, public Interface, public Worker
 {
 	friend class WhisperPeer;
 
@@ -64,7 +65,13 @@ public:
 
 	void cleanup();
 
+protected:
+	void doWork();
+
 private:
+	virtual void onStarting() { startWorking(); }
+	virtual void onStopping() { stopWorking(); }
+
 	void streamMessage(h256 _m, RLPStream& _s) const;
 
 	void noteChanged(h256 _messageHash, h256 _filter);
diff --git a/libwhisper/WhisperPeer.cpp b/libwhisper/WhisperPeer.cpp
index 56f4e456e..c3a28e3c3 100644
--- a/libwhisper/WhisperPeer.cpp
+++ b/libwhisper/WhisperPeer.cpp
@@ -72,7 +72,6 @@ bool WhisperPeer::interpret(unsigned _id, RLP const& _r)
 		for (auto i: _r)
 			if (n++)
 				host()->inject(Envelope(i), this);
-		sendMessages();
 		break;
 	}
 	default:
@@ -97,10 +96,15 @@ void WhisperPeer::sendMessages()
 		}
 	}
 
-	if (!n)
-		// pause for a bit if no messages to send - this is horrible and broken.
-		// the message subsystem should really just keep pumping out messages while m_unseen.size() and there's bandwidth for them.
-		this_thread::sleep_for(chrono::milliseconds(20));
+	// the message subsystem should really just keep pumping out messages while m_unseen.size() and there's bandwidth for them.
+	auto diff = chrono::duration_cast<chrono::milliseconds>(chrono::system_clock::now() - m_timer);
+	if (n || diff.count() > 0)
+	{
+		RLPStream s;
+		prep(s, MessagesPacket, n).appendRaw(amalg.out(), n);
+		sealAndSend(s);
+		m_timer = chrono::system_clock::now();
+	}
 
 	{
 		RLPStream s;
diff --git a/libwhisper/WhisperPeer.h b/libwhisper/WhisperPeer.h
index f60de8f01..faac2d870 100644
--- a/libwhisper/WhisperPeer.h
+++ b/libwhisper/WhisperPeer.h
@@ -68,6 +68,8 @@ private:
 
 	mutable dev::Mutex x_unseen;
 	std::map<unsigned, h256> m_unseen;	///< Rated according to what they want.
+
+	std::chrono::system_clock::time_point m_timer = std::chrono::system_clock::now();
 };
 
 }
diff --git a/neth/main.cpp b/neth/main.cpp
index 6be555fbb..cb6d35593 100644
--- a/neth/main.cpp
+++ b/neth/main.cpp
@@ -603,7 +603,7 @@ int main(int argc, char** argv)
 			vector<string> l;
 			l.push_back("Amount");
 			stringstream label;
-			label << "Gas price (" << info.minGasPrice << ")";
+			label << "Gas price";
 			l.push_back(label.str());
 			l.push_back("Gas");
 			vector<string> b;
@@ -646,14 +646,12 @@ int main(int argc, char** argv)
 				ssbd << bbd;
 				cnote << ssbd.str();
 				int ssize = fields[4].length();
-				u256 minGas = (u256)Client::txGas(data.size(), 0);
+				u256 minGas = (u256)Client::txGas(data, 0);
 				if (size < 40)
 				{
 					if (size > 0)
 						cwarn << "Invalid address length:" << size;
 				}
-				else if (gasPrice < info.minGasPrice)
-					cwarn << "Minimum gas price is" << info.minGasPrice;
 				else if (gas < minGas)
 					cwarn << "Minimum gas amount is" << minGas;
 				else if (ssize < 40)
@@ -702,9 +700,9 @@ int main(int argc, char** argv)
 					auto h = bc.currentHash();
 					auto blockData = bc.block(h);
 					BlockInfo info(blockData);
-					u256 minGas = (u256)Client::txGas(0, 0);
+					u256 minGas = (u256)Client::txGas(bytes(), 0);
 					Address dest = h160(fromHex(fields[0]));
-					c.transact(us.secret(), amount, dest, bytes(), minGas, info.minGasPrice);
+					c.transact(us.secret(), amount, dest, bytes(), minGas);
 				}
 			}
 		}
@@ -718,7 +716,7 @@ int main(int argc, char** argv)
 			vector<string> l;
 			l.push_back("Endowment");
 			stringstream label;
-			label << "Gas price (" << info.minGasPrice << ")";
+			label << "Gas price";
 			l.push_back(label.str());
 			l.push_back("Gas");
 			vector<string> b;
@@ -763,16 +761,14 @@ int main(int argc, char** argv)
 					cnote << "Init:";
 					cnote << ssc.str();
 				}
-				u256 minGas = (u256)Client::txGas(init.size(), 0);
+				u256 minGas = (u256)Client::txGas(init, 0);
 				if (endowment < 0)
 					cwarn << "Invalid endowment";
-				else if (gasPrice < info.minGasPrice)
-					cwarn << "Minimum gas price is" << info.minGasPrice;
 				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);
 				}
 			}
 		}
diff --git a/test/solidityParser.cpp b/test/solidityParser.cpp
index 9319a02c5..6a97a5d99 100644
--- a/test/solidityParser.cpp
+++ b/test/solidityParser.cpp
@@ -37,13 +37,14 @@ namespace test
 
 namespace
 {
-ASTPointer<ASTNode> parseText(std::string const& _source)
+ASTPointer<ContractDefinition> parseText(std::string const& _source)
 {
 	Parser parser;
 	return parser.parse(std::make_shared<Scanner>(CharStream(_source)));
 }
 }
 
+
 BOOST_AUTO_TEST_SUITE(SolidityParser)
 
 BOOST_AUTO_TEST_CASE(smoke_test)
@@ -91,6 +92,164 @@ BOOST_AUTO_TEST_CASE(single_function_param)
 	BOOST_CHECK_NO_THROW(parseText(text));
 }
 
+BOOST_AUTO_TEST_CASE(function_natspec_documentation)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  /// This is a test function\n"
+					   "  function functionName(hash hashin) returns (hash hashout) {}\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(), " This is a test function");
+}
+
+BOOST_AUTO_TEST_CASE(function_normal_comments)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  // We won't see this comment\n"
+					   "  function functionName(hash hashin) returns (hash hashout) {}\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_MESSAGE(function->getDocumentation() == nullptr,
+						"Should not have gotten a Natspect comment for this function");
+}
+
+BOOST_AUTO_TEST_CASE(multiple_functions_natspec_documentation)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  /// This is test function 1\n"
+					   "  function functionName1(hash hashin) returns (hash hashout) {}\n"
+					   "  /// This is test function 2\n"
+					   "  function functionName2(hash hashin) returns (hash hashout) {}\n"
+					   "  // nothing to see here\n"
+					   "  function functionName3(hash hashin) returns (hash hashout) {}\n"
+					   "  /// This is test function 4\n"
+					   "  function functionName4(hash hashin) returns (hash hashout) {}\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(), " This is test function 1");
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(1));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(), " This is test function 2");
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(2));
+	BOOST_CHECK_MESSAGE(function->getDocumentation() == nullptr,
+						"Should not have gotten natspec comment for functionName3()");
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(3));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(), " This is test function 4");
+}
+
+BOOST_AUTO_TEST_CASE(multiline_function_documentation)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  /// This is a test function\n"
+					   "  /// and it has 2 lines\n"
+					   "  function functionName1(hash hashin) returns (hash hashout) {}\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(),
+					  " This is a test function\n"
+					  " and it has 2 lines");
+}
+
+BOOST_AUTO_TEST_CASE(natspec_comment_in_function_body)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  /// fun1 description\n"
+					   "  function fun1(uint256 a) {\n"
+					   "    var b;\n"
+					   "    /// I should not interfere with actual natspec comments\n"
+					   "    uint256 c;\n"
+					   "    mapping(address=>hash) d;\n"
+					   "    string name = \"Solidity\";"
+					   "  }\n"
+					   "  uint256 stateVar;\n"
+					   "  /// This is a test function\n"
+					   "  /// and it has 2 lines\n"
+					   "  function fun(hash hashin) returns (hash hashout) {}\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(), " fun1 description");
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(1));
+	BOOST_CHECK_EQUAL(*function->getDocumentation(),
+					  " This is a test function\n"
+					  " and it has 2 lines");
+}
+
+BOOST_AUTO_TEST_CASE(natspec_docstring_between_keyword_and_signature)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  function ///I am in the wrong place \n"
+					   "  fun1(uint256 a) {\n"
+					   "    var b;\n"
+					   "    /// I should not interfere with actual natspec comments\n"
+					   "    uint256 c;\n"
+					   "    mapping(address=>hash) d;\n"
+					   "    string name = \"Solidity\";"
+					   "  }\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_MESSAGE(!function->getDocumentation(),
+						"Shouldn't get natspec docstring for this function");
+}
+
+BOOST_AUTO_TEST_CASE(natspec_docstring_after_signature)
+{
+	ASTPointer<ContractDefinition> contract;
+	ASTPointer<FunctionDefinition> function;
+	char const* text = "contract test {\n"
+					   "  uint256 stateVar;\n"
+					   "  function fun1(uint256 a) {\n"
+					   "  /// I should have been above the function signature\n"
+					   "    var b;\n"
+					   "    /// I should not interfere with actual natspec comments\n"
+					   "    uint256 c;\n"
+					   "    mapping(address=>hash) d;\n"
+					   "    string name = \"Solidity\";"
+					   "  }\n"
+					   "}\n";
+	BOOST_REQUIRE_NO_THROW(contract = parseText(text));
+	auto functions = contract->getDefinedFunctions();
+
+	BOOST_REQUIRE_NO_THROW(function = functions.at(0));
+	BOOST_CHECK_MESSAGE(!function->getDocumentation(),
+						"Shouldn't get natspec docstring for this function");
+}
+
 BOOST_AUTO_TEST_CASE(struct_definition)
 {
 	char const* text = "contract test {\n"
diff --git a/windows/LibEthereum.vcxproj b/windows/LibEthereum.vcxproj
index 4ae5d5bf8..66efe7dc2 100644
--- a/windows/LibEthereum.vcxproj
+++ b/windows/LibEthereum.vcxproj
@@ -125,6 +125,7 @@
     <ClCompile Include="..\libethereum\Transaction.cpp" />
     <ClCompile Include="..\libethereum\TransactionQueue.cpp" />
     <ClCompile Include="..\libethereum\Utility.cpp" />
+    <ClCompile Include="..\libethereum\VMFactory.cpp" />
     <ClCompile Include="..\libevmcore\Assembly.cpp" />
     <ClCompile Include="..\libevmcore\Instruction.cpp" />
     <ClCompile Include="..\libevm\ExtVMFace.cpp">
@@ -342,6 +343,7 @@
     <ClInclude Include="..\libethereum\Transaction.h" />
     <ClInclude Include="..\libethereum\TransactionQueue.h" />
     <ClInclude Include="..\libethereum\Utility.h" />
+    <ClInclude Include="..\libethereum\VMFactory.h" />
     <ClInclude Include="..\libevmcore\Assembly.h" />
     <ClInclude Include="..\libevmcore\Exceptions.h" />
     <ClInclude Include="..\libevmcore\Instruction.h" />
@@ -574,4 +576,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/windows/LibEthereum.vcxproj.filters b/windows/LibEthereum.vcxproj.filters
index fd03dd451..85f1fdedc 100644
--- a/windows/LibEthereum.vcxproj.filters
+++ b/windows/LibEthereum.vcxproj.filters
@@ -190,12 +190,6 @@
     <ClCompile Include="..\libdevcrypto\CryptoPP.cpp">
       <Filter>libdevcrypto</Filter>
     </ClCompile>
-    <ClCompile Include="..\libdevcrypto\EC.cpp">
-      <Filter>libdevcrypto</Filter>
-    </ClCompile>
-    <ClCompile Include="..\libdevcrypto\SHA3MAC.cpp">
-      <Filter>libdevcrypto</Filter>
-    </ClCompile>
     <ClCompile Include="..\libethereum\Account.cpp">
       <Filter>libethereum</Filter>
     </ClCompile>
@@ -205,6 +199,11 @@
     <ClCompile Include="..\libevm\VMFace.cpp">
       <Filter>libevm</Filter>
     </ClCompile>
+    <ClCompile Include="..\libdevcrypto\AES.cpp" />
+    <ClCompile Include="..\libdevcrypto\ECDHE.cpp" />
+    <ClCompile Include="..\libethereum\VMFactory.cpp">
+      <Filter>libethereum</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="stdafx.h">
@@ -444,6 +443,9 @@
     <ClInclude Include="..\libevm\VMFace.h">
       <Filter>libevm</Filter>
     </ClInclude>
+    <ClInclude Include="..\libethereum\VMFactory.h">
+      <Filter>libethereum</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Windows">
@@ -480,4 +482,4 @@
       <UniqueIdentifier>{d838fece-fc20-42f6-bff5-97c236159b80}</UniqueIdentifier>
     </Filter>
   </ItemGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/windows/LibEvmJit.vcxproj b/windows/LibEvmJit.vcxproj
index a9288a212..50824fb2d 100644
--- a/windows/LibEvmJit.vcxproj
+++ b/windows/LibEvmJit.vcxproj
@@ -131,6 +131,7 @@
     <ClCompile Include="..\libevmjit\ExecutionEngine.cpp" />
     <ClCompile Include="..\libevmjit\Ext.cpp" />
     <ClCompile Include="..\libevmjit\GasMeter.cpp" />
+    <ClCompile Include="..\libevmjit\interface.c" />
     <ClCompile Include="..\libevmjit\Memory.cpp" />
     <ClCompile Include="..\libevmjit\Runtime.cpp" />
     <ClCompile Include="..\libevmjit\Stack.cpp" />
diff --git a/windows/LibEvmJit.vcxproj.filters b/windows/LibEvmJit.vcxproj.filters
index ae89fe550..1a0d86e56 100644
--- a/windows/LibEvmJit.vcxproj.filters
+++ b/windows/LibEvmJit.vcxproj.filters
@@ -48,6 +48,9 @@
     <ClCompile Include="..\libevmjit\Arith256.cpp">
       <Filter>libevmjit</Filter>
     </ClCompile>
+    <ClCompile Include="..\libevmjit\interface.c">
+      <Filter>libevmjit</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\libevmjit\BasicBlock.h">