# 7.2 合约在系统中的职责边界

在该架构中，智能合约承担的职责被严格限定，其目标不是“做得多”，而是“做得不可替代”。

合约的核心职责集中在以下三个方面：

* **规则固化**\
  红包在创建时，其金额、数量、玩法类型与时间约束即被写入合约状态，后续不可更改。
* **状态推进**\
  每一次领取或超时，都会触发明确的状态变化，且状态只允许单向推进。
* **资金结算**\
  所有资金的分配与退回，均由合约直接完成，不经过任何中间账户。

相对地，合约明确不承担交互解析、用户身份识别或策略判断等职责。这些逻辑被刻意留在链下，以避免合约复杂化并扩大攻击面。


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