--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/christie/blockchain/Transaction.java	Mon Nov 19 12:31:36 2018 +0900
@@ -0,0 +1,62 @@
+package christie.blockchain;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.math.BigInteger;
+
+// インターフェイスにしたほうがいいかもしれない. 後からdataの内容変える可能性がある.
+public class Transaction {
+    private byte[] hash;
+
+    private long nonce;
+
+    private byte[] sendAddress;
+
+    private byte[] receiveAddress;
+
+    private byte[] data;
+
+    private long timestamp;
+
+    private byte[] signature;
+
+    //public ArrayList<TransactionInput> inputs = new ArrayList<TransactionInput>();
+    //public ArrayList<TransactionOutput> outputs = new ArrayList<TransactionOutput>();
+
+
+    public Transaction(byte[] sendAddress, byte[] receiveAddress, byte[] data){
+        this.sendAddress = sendAddress;
+        this.receiveAddress = receiveAddress;
+        this.data = data;
+
+    }
+/*
+    public Transaction(byte[] from, byte[] to, byte[] value,  ArrayList<TransactionInput> inputs) {
+        this.sendAddress = from;
+        this.receiveAddress = to;
+        this.value = value;
+        this.inputs = inputs;
+    }
+*/
+    public byte[] calcHash(){
+        HashUtil hashUtil = new HashUtil();
+
+        byte[] timestampByte = BigInteger.valueOf(this.timestamp).toByteArray();
+
+        byte[] nonceByte = BigInteger.valueOf(this.nonce).toByteArray();
+
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+
+        try {
+            output.write(hash);
+            output.write(timestampByte);
+            output.write(nonceByte);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return hashUtil.sha256(output.toByteArray());
+
+    }
+
+}