# randU256

> **randU256**(): `bigint`

Defined in: [packages/synapse-core/src/utils/rand.ts:15](https://github.com/FilOzone/synapse-sdk/blob/98d51d3144300a5bf7f6471621b5243e98f97aae/packages/synapse-core/src/utils/rand.ts#L15)

## Returns

`bigint`

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