在加密货币的世界里，比特币（BTC）无疑是“王者”——它不仅开创了区块链和数字货币的先河，更以其去中心化、总量恒定（2100万枚）的特性，成为全球数字资产的“锚定物”，自比特币诞生以来，围绕其技术路线、社区共识的争议从未停歇，其中最著名的分叉事件之一，便是比特币现金（Bitcoin Cash，简称BCD）的诞生，BCD与BTC究竟是什么关系？它们是“数字孪生”般的复制，还是代表着“价值分叉”的不同路径？
BTC的“原教旨”与“扩容之争”：BCD诞生的根源
要理解BCD与BTC的关系，必须先回到比特币的核心矛盾：扩容问题。
2009年比特币诞生时，其设计目标是为全球提供一种点对点的电子现金系统，随着用户数量增长，比特币的区块大小限制（最初仅1MB）逐渐成为瓶颈——每秒只能处理约7笔交易，交易费用飙升到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到到
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