# 标识码

就系统的大多数用途而言，标识码（例如：canister,用户和子网ID）都是二进制blob，长度在0到29个字节之间。但是，它们具有某种结构来编码特定的身份验证和授权行为。


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://mixdao.gitbook.io/dfinity/qi-internet-computer-jie-kou-gui-fan/biao-shi-ma.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.