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

# Best Practices

> Guidelines for integrating verifiable randomness

Use these tips to get the most reliable results when requesting randomness.
Ensure your rollup delegates to a trusted oracle queue with the `DelegateOracleQueue` instruction so that requests are fulfilled promptly.

### Seed Selection

* Combine user input with server timestamps or game state to create unpredictable seeds.
* Avoid letting players specify the entire `caller_seed` to prevent grinding.

### Callback Validation

* Always check the `vrf_program_identity` to confirm the callback is from MagicBlock's official signer.
* Reject callbacks that do not match the original request parameters.

### State Management

* Store any pending request identifiers so that retries or unexpected callbacks can be handled safely.
* Track the oracle queue your requests were delegated to so results can be matched back correctly.
* Keep random outputs ephemeral—consume them immediately within your [rollup logic](/pages/get-started/introduction/ephemeral-rollup) and avoid reusing them.

Following these guidelines reduces the risk of manipulation and ensures consistent randomness across sessions.