> ## Documentation Index
> Fetch the complete documentation index at: https://docs.base.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Granite L2 Chain Derivation Changes

> Derivation changes in the Granite upgrade, updating the CHANNEL_TIMEOUT protocol parameter.

## Protocol Parameter Changes

The following table gives an overview of the changes in parameters.

| Parameter         | Pre-Granite (default) value | Granite value | Notes                         |
| ----------------- | --------------------------- | ------------- | ----------------------------- |
| `CHANNEL_TIMEOUT` | 300                         | 50            | Protocol Constant is reduced. |

## Reduce Channel Timeout

With Granite, the `CHANNEL_TIMEOUT` is reduced from 300 to 50 L1 Blocks.
The new rule activation timestamp is based on the blocktime of the L1 block that the channel frame is included.