# randU256

```ts
function randU256(): bigint;
```

Defined in: [packages/synapse-core/src/utils/rand.ts:15](https://github.com/FilOzone/synapse-sdk/blob/1d6c4b9fe34534bf1087dfe41491b72be0b46858/packages/synapse-core/src/utils/rand.ts#L15)

## Returns

`bigint`

a random unsigned big integer between `0` and `2**256-1` inclusive