diff --git a/src/LedgerConsensus.h b/src/LedgerConsensus.h
new file mode 100644
index 0000000000..980efb8a5b
--- /dev/null
+++ b/src/LedgerConsensus.h
@@ -0,0 +1,88 @@
+#ifndef __LEDGER_CONSENSUS__
+#define __LEDGER_CONSENSUS__
+
+#include <boost/unordered/unordered_map.hpp>
+
+#include "key.h"
+#include "Transaction.h"
+#include "LedgerAcquire.h"
+
+class LCPosition
+{ // A position taken by one of our trusted peers
+protected:
+	uint256 mPubKeyHash;
+	CKey::pointer mPubKey;
+	uint256 mCurrentPosition;
+	uint32 mSequence;
+
+public:
+	typedef boost::shared_ptr<LCPosition> pointer;
+
+	LCPosition(CKey::pointer pubKey, const uint256& currentPosition, uint32 seq) :
+		mPubKey(pubKey), mCurrentPosition(currentPosition), mSequence(seq) { ; }
+
+	const uint256& getPubKeyHash() const		{ return mPubKeyHash; }
+	const uint256& getCurrentPosition() const	{ return mCurrentPosition; }
+	uint32 getSeq() const						{ return mSequence; }
+
+	bool verifySignature(const uint256& hash, const std::vector<unsigned char>& signature) const;
+	void setPosition(const uint256& position, uint32 sequence);
+};
+
+
+class LCTransaction
+{ // A transaction that may be disputed
+protected:
+	uint256 mTransactionID;
+	int mYays, mNays;
+	bool mOurPosition;
+	boost::unordered_map<uint256, bool> mVotes;
+	Transaction::pointer mTransaction;
+
+public:
+	typedef boost::shared_ptr<LCTransaction> pointer;
+
+	LCTransaction(const uint256 &txID, bool ourPosition) : mTransactionID(txID), mYays(0), mNays(0),
+		mOurPosition(ourPosition) { ; }
+
+	const uint256& getTransactionID() const	{ return mTransactionID; }
+	bool getOurPosition() const				{ return mOurPosition; }
+
+	bool haveTransaction() const			{ return !!mTransaction; }
+	Transaction::pointer getTransaction()	{ return mTransaction; }
+
+	void setVote(const uint256& peer, bool votesYes);
+
+	bool updatePosition(int timePassed);
+};
+
+
+class LedgerConsensus
+{
+protected:
+	Ledger::pointer mPreviousLedger, mCurrentLedger;
+
+	// Convergence tracking, trusted peers indexed by hash of public key
+	boost::unordered_map<uint256, LCPosition::pointer> mPeerPositions;
+
+	// Transaction Sets, indexed by hash of transaction tree
+	boost::unordered_map<uint256, SHAMap::pointer> mComplete;
+	boost::unordered_map<uint256, TransactionAcquire::pointer> mAcquiring;
+
+
+public:
+	LedgerConsensus(Ledger::pointer previousLedger, Ledger::pointer currentLedger) :
+		mPreviousLedger(previousLedger), mCurrentLedger(currentLedger) { ; }
+
+	Ledger::pointer peekPreviousLedger()	{ return mPreviousLedger; }
+	Ledger::pointer peekCurrentLedger()		{ return mCurrentLedger; }
+
+	LCPosition::pointer getCreatePeerPosition(const uint256& pubKeyHash);
+
+	SHAMap::pointer getTransactionTree(const uint256& hash);
+	TransactionAcquire::pointer getAcquiring(const uint256& hash);
+	void acquireComplete(const uint256& hash);
+};
+
+
+#endif