pezkuwi-subxt/substrate/frame/randomness-collective-flip/README.md

# Randomness Module

The Randomness Collective Flip module provides a [`random`](https://docs.rs/pallet-randomness-collective-flip/latest/pallet_randomness_collective_flip/struct.Module.html#method.random)
function that generates low-influence random values based on the block hashes from the previous
`81` blocks. Low-influence randomness can be useful when defending against relatively weak
adversaries. Using this pallet as a randomness source is advisable primarily in low-security
situations like testing.

## Public Functions

See the [`Module`](https://docs.rs/pallet-randomness-collective-flip/latest/pallet_randomness_collective_flip/struct.Module.html) struct for details of publicly available functions.

## Usage

### Prerequisites

Import the Randomness Collective Flip module and derive your module's configuration trait from
the system trait.

### Example - Get random seed for the current block

```rust
use frame_support::traits::Randomness;

#[frame_support::pallet]
pub mod pallet {
    use super::*;
    use frame_support::pallet_prelude::*;
    use frame_system::pallet_prelude::*;

    #[pallet::pallet]
    pub struct Pallet<T>(_);

    #[pallet::config]
    pub trait Config: frame_system::Config + pallet_randomness_collective_flip::Config {}

    #[pallet::call]
    impl<T: Config> Pallet<T> {
        #[pallet::weight(0)]
        pub fn random_module_example(origin: OriginFor<T>) -> DispatchResult {
            let _random_value = <pallet_randomness_collective_flip::Pallet<T>>::random(&b"my context"[..]);
            Ok(())
        }
    }
}
```

License: Apache-2.0