> For the complete documentation index, see [llms.txt](https://yeasy.gitbook.io/blockchain_guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yeasy.gitbook.io/blockchain_guide/11_app_dev/chaincode_example04.md).

# 学历认证

[chaincode\_example04.go](https://github.com/yeasy/blockchain_guide/blob/master/11_app_dev/chaincode_example04.go) 演示学校、学生和学历变更记录的链上管理。示例为了便于阅读，使用派生字符串模拟地址、公钥、私钥和签名。

## 数据结构

* `School`：学校名称、位置、地址、公私钥和学生地址列表；
* `Student`：学生姓名、地址和学历记录 ID 列表；
* `Background`：学历记录 ID、离校时间和状态；
* `Record`：学校对学生学历状态的变更记录。

## 主要交易函数

* `CreateSchool`：创建学校；
* `CreateStudent`：创建学生；
* `EnrollStudent`：学校登记学生入学；
* `UpdateDiploma`：学校更新学生学历状态；
* `GetStudentByAddress`、`GetSchoolByAddress`、`GetRecordByID`、`GetBackgroundByID`、`GetRecords`：读取状态。

真实系统中，签名与验签应由客户端身份、证书和密码学库完成，本例只保留业务流程骨架。


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