> For the complete documentation index, see [llms.txt](https://docs.wenwin.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wenwin.com/games/usdc-7-35-lottery/technical-details/random-number-generation.md).

# Random Number Generation

As blockchains cannot generate random numbers, the Wenwin smart contracts will use a third-party Verifiable Random Function (VRF) to generate the lottery's draw numbers. We aim to use two VRF providers. The secondary randomizer will be used as a fallback if the primary fails to provide random numbers.

To ensure the resiliency of the system in times when the randomness source is unavailable, the following mechanisms have been implemented:

1. Anyone can trigger a retry if a `randomness request` via the current source fails to be fulfilled within a predefined timeframe.
2. After a predefined number of failed retries, the deployer can swap the randomness source with a different one.

It's important to understand that the deployer **cannot** change the randomness source other than in the unlikely scenario in which the current oracle fails repeatedly, as per the specifications above. Additionally, the predefined timeframe and the number of allowed retry attempts are immutable and cannot be changed after the contracts have been deployed.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://docs.wenwin.com/games/usdc-7-35-lottery/technical-details/random-number-generation.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.