概念
在《位元幣：一種點對點的電子現金系統》中，電子貨幣 被定義為：每一位所有者通過對前一次交易和下一位擁有者的公鑰(Public key) 簽署一個隨機散列的數字簽名，并將這個簽名附加在這枚電子貨幣的末尾，電子貨幣就發送給了下一位所有者，電子貨幣 被設計成以交易 為載體表現，而實際上，在原始碼中，電子貨幣 確實無物體類，交易 擁有交易輸入 、交易輸出 兩個重要的屬性，交易輸入 包含著上一筆交易 的資訊，及所有者的所有權證明，交易輸出 則包含著接收者的資訊，以及轉賬數量，電子貨幣 的所有者發起一筆交易 時，可在交易輸入 使用此前收到交易 資訊、附上所有權證明，并在交易輸出 中填寫轉賬數量及接收者的資訊，輸入數量與輸出數量相比，多的部分則被當作手續費 （Fee），
疑問
為何電子貨幣 不以物體類進行表示，而要間接通過交易 表示？ 資料結構
在bitcoin-0.1.5中，與交易 相關的資料結構主要集中在main.h檔案中，類圖如下：
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CTransaction
int nVersion
vector<CTxIn> vin;
vector<CTxOut> vout;
int nLockTime
CTxIn
COutPoint prevout
CScript scriptSig
unsigned int
CTxOut
int64 nValue
CScript scriptPubKey
COutPoint
uint256 hash
unsigned int
CScript是腳本類，可暫時抽象理解為存放所有權證明，交易輸出 ，
鏈上資料
在Block 181中，有一份交易手續費 為0BTC，而順著輸入地址往上溯源，最終可發現12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S用于交易的BTC源自Block9的挖礦收入，
