diff --git a/libethereum/BlockChain.cpp b/libethereum/BlockChain.cpp
index 3ad65a7d9..39b997cc5 100644
--- a/libethereum/BlockChain.cpp
+++ b/libethereum/BlockChain.cpp
@@ -38,6 +38,35 @@ BlockChain::~BlockChain()
 
 void BlockChain::import(bytes const& _block)
 {
+	BlockInfo bi;
+	try
+	{
+		bi.populate(_block, 0);
+		auto newHash = sha256(_block);
+
+		// Check block doesn't already exist first!
+		if (m_numberAndParent.count(newHash))
+			return;
+
+		// Work out its number as the parent's number + 1
+		auto it = m_numberAndParent.find(bi.parentHash);
+		if (it == m_numberAndParent.end())
+			// 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.
+			return;
+		bi.number = it->second.first + 1;
+
+		// Insert into DB
+		m_numberAndParent[newHash] = make_pair(bi.number, bi.parentHash);
+		m_children.insert(make_pair(bi.parentHash, newHash));
+		// TODO: put _block onto disk and load into cache.
+
+		// This might be the new last block; count back through ancestors to common shared ancestor and compare to current.
+	}
+	catch (...)
+	{
+		// Exit silently on exception(?)
+		return;
+	}
 }
 
 bytesConstRef BlockChain::block(u256 _hash) const
diff --git a/libethereum/BlockChain.h b/libethereum/BlockChain.h
index 30d7a7ab2..3fbaac9ae 100644
--- a/libethereum/BlockChain.h
+++ b/libethereum/BlockChain.h
@@ -48,7 +48,7 @@ public:
 	BlockChain();
 	~BlockChain();
 
-	/// (Potentiall) renders invalid existing bytesConstRef returned by lastBlock.
+	/// (Potentially) renders invalid existing bytesConstRef returned by lastBlock.
 	/// To be called from main loop every 100ms or so.
 	void process();
 	
@@ -78,5 +78,3 @@ private:
 };
 
 }
-
-
diff --git a/libethereum/BlockInfo.cpp b/libethereum/BlockInfo.cpp
index 06eb638ed..28a351984 100644
--- a/libethereum/BlockInfo.cpp
+++ b/libethereum/BlockInfo.cpp
@@ -73,18 +73,23 @@ void BlockInfo::populate(bytesConstRef _block, u256 _number)
 	}
 }
 
-void BlockInfo::verify(bytesConstRef _block, u256 _number)
+void BlockInfo::verify(bytesConstRef _block, u256 _number, u256 _parentHash)
 {
 	populate(_block, _number);
 
 	RLP root(_block);
+	if (root[0][0].toInt<u256>() != _parentHash)
+		throw InvalidParentHash();
+
 	if (sha256Transactions != sha256(root[1].data()))
 		throw InvalidTransactionsHash();
 
 	if (sha256Uncles != sha256(root[2].data()))
 		throw InvalidUnclesHash();
 
-	// TODO: check timestamp.
+	// TODO: check timestamp after previous timestamp.
+	// TODO: check parent's hash
+
 	// TODO: check difficulty against timestamp.
 	// TODO: check proof of work.
 
diff --git a/libethereum/BlockInfo.h b/libethereum/BlockInfo.h
index 9d54465fc..1533d5d9a 100644
--- a/libethereum/BlockInfo.h
+++ b/libethereum/BlockInfo.h
@@ -47,7 +47,7 @@ public:
 
 	static BlockInfo const& genesis() { if (!s_genesis) (s_genesis = new BlockInfo)->populateGenesis(); return *s_genesis; }
 	void populate(bytesConstRef _block, u256 _number);
-	void verify(bytesConstRef _block, u256 _number);
+	void verify(bytesConstRef _block, u256 _number, u256 _parentHash);
 
 	static bytes createGenesisBlock();