1 files changed, 29 insertions, 0 deletions
diff --git a/pkg/blockchain/coindatabase/coin.go b/pkg/blockchain/coindatabase/coin.go
new file mode 100644
index 0000000..4281ac1
--- /dev/null
+++ b/pkg/blockchain/coindatabase/coin.go
@@ -0,0 +1,29 @@
+package coindatabase
+
+import "Chain/pkg/block"
+
+// Coin is used by the CoinDatabase to keep track of unspent
+// TransactionOutputs.
+// TransactionOutput is the underlying TransactionOutput.
+// IsSpent is whether that TransactionOutput has been spent.
+// Active is whether that TransactionOutput is one created by
+// Blocks on the active Chain.
+type Coin struct {
+	TransactionOutput *block.TransactionOutput
+	IsSpent           bool
+}
+
+// CoinLocator is a dumbed down TransactionInput, used
+// as a key to Coins in the CoinDatabase's mainCache.
+type CoinLocator struct {
+	ReferenceTransactionHash string
+	OutputIndex              uint32
+}
+
+// makeCoinLocator returns a CoinLocator given a TransactionInput.
+func makeCoinLocator(txi *block.TransactionInput) CoinLocator {
+	return CoinLocator{
+		ReferenceTransactionHash: txi.ReferenceTransactionHash,
+		OutputIndex:              txi.OutputIndex,
+	}
+}