# Block Detail Page

Each Aptos block contains both user transactions and special system transactions to *mark* the beginning and end of the transaction batch. The number of transactions within a block varies depending on network activity and a configurable maximum block size limit. As the blockchain becomes busier, blocks will likely contain more transactions.

Specifically, there are two system transactions:

1. `BlockMetadataTransaction` - is inserted at the beginning of the block. A `BlockMetadata` transaction can also mark the end of an [epoch](https://aptos.dev/concepts/blocks#epoch) and trigger reward distribution to validators.
2. `StateCheckpointTransaction` - is appended at the end of the block and is used as a checkpoint milestone.

Here is how the details are displayed on aptscan.ai

<figure><img src="/files/J2EaqX4r4VFF2huocaMq" alt=""><figcaption></figcaption></figure>

***Overview section:***

* **Block heigh**t: the block position on the chain
* **Version**: the transactions that are included in the block
* **total**: the number of transactions inside the block
* **Committed timestamps**: the timestamp that the block got appended to the chain
* **Proposer**: block leader&#x20;
* **Epoch**: represents a longer period of time in order to safely synchronize major changes such as validator set additions/removals
* **Round**: achieving consensus on a block of transactions and their execution results.

***Transactions section***:

* **version**: the transaction&#x20;
* **type:** type of transaction
* **age**: time recording of the transaction
* **Sender**: the account initiates the txn
* **Function**: the function of the txn
* **gas fee**: cost to run the txn


---

# 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://docs.aptscan.ai/browsing-the-site/blockchain/blocks/block-detail-page.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.