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

# Network Security

OpenGDP employs a multi-layered security approach, validating data at the header, block, and transaction levels.

## Validation Rules

* **Header**: Timestamps must be monotonic and within 3 seconds of the future. Gas limits must strictly follow the protocol formulas.
* **Block**: Every block must contain exactly one valid end-of-block system transaction.
* **Sub-blocks**: Validators can only submit one sub-block per block. Signatures are verified against the epoch's participant set, and gas usage is strictly bounded.

## Runtime Guards

* **Throttling**: Non-payment transactions are hard-capped by the `general_gas_limit`. Even if the block has space, if the general lane is full, these transactions are delayed.
* **Safety**: The protocol enforces token pauses and policy blacklists at the pool and execution level, preventing illicit activity.