diff --git a/Avalanche.h b/Avalanche.h
new file mode 100644
index 0000000000..363aaf14ca
--- /dev/null
+++ b/Avalanche.h
@@ -0,0 +1,37 @@
+#ifndef __AVALANCHE__
+#define __AVALANCHE__
+
+#include <map>
+#include <set>
+
+#include "Transaction.h"
+#include "Hanko.h"
+
+class DisputedTransaction
+{
+protected:
+	Transaction::pointer mTransaction;
+	std::vector<Hanko::pointer> mNodesIncluding;
+	std::vector<Hanko::pointer> mNodesRejecting;
+	uint64 mTimeTaken; // when we took our position on this transaction
+	bool mOurPosition;
+};
+
+class DTComp
+{
+public:
+	bool operator()(const DisputedTransaction&, const DisputedTransaction&);
+};
+
+class Avalanche
+{
+protected:
+	SHAMap::pointer mOurLedger;
+	std::map<uint256, DisputedTransaction:pointer> mTxByID;
+	std::set<DisputedTransaction::pointer, DTComp> mTxInASOrder;
+
+public:
+	Avalanche(SHAMap::pointer ourLedger);
+};
+
+#endif