# randU256

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

Defined in: [packages/synapse-core/src/utils/rand.ts:15](https://github.com/FilOzone/synapse-sdk/blob/d9d7ff65cc57a0664db3a209a0d25c3a4d4e34f0/packages/synapse-core/src/utils/rand.ts#L15)

## Returns

`bigint`

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