# Drand (/docs/guides/evm/precompiles/drand)

| Property           | Value                                        |
| ------------------ | -------------------------------------------- |
| Implementation     | `DrandPrecompile`                            |
| Solidity interface | `IDrand`                                     |
| Address            | `0x0000000000000000000000000000000000000810` |
| Status             | Deployed                                     |

This precompile exposes typed beacon configuration and pulse data instead
of requiring callers to construct Drand storage keys and decode SCALE values.
Contracts can use the runtime's stored randomness state deterministically
without receiving permission to configure the beacon or submit pulses.

## Views [#views]

| Function                     | Replaces                                              |
| ---------------------------- | ----------------------------------------------------- |
| `getBeaconConfig()`          | `Drand.BeaconConfig`                                  |
| `getPulse(uint64 round)`     | `Drand.Pulses`                                        |
| `getStoredRoundRange()`      | `Drand.OldestStoredRound` and `Drand.LastStoredRound` |
| `getNextUnsignedAt()`        | `Drand.NextUnsignedAt`                                |
| `hasMigrationRun(bytes key)` | `Drand.HasMigrationRun`                               |

## State-changing operations [#state-changing-operations]

`Drand.set_beacon_config` and `Drand.set_oldest_stored_round` require Root, and
`Drand.write_pulse` requires `None` origin as an unsigned offchain-worker
submission. None is exposed as a typed EVM operation because doing so would
bypass the pallet's top-level origin checks.

`hasMigrationRun(bytes)` bounds the supplied key to 128 bytes before reading
storage.

Source: [`drand.sol`](https://github.com/RaoFoundation/subtensor/blob/main/precompiles/src/solidity/drand.sol)