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# Authorization.hash

:::info
`Authorization.hash` is a re-export of ox's [`Authorization.hash`](https://oxlib.sh/api/Authorization/hash). Refer to the ox documentation for the full reference.
:::

Computes the hash for an [`Authorization.Authorization`](/docs/utilities/authorization/types#authorization) in [EIP-7702 format](https://eips.ethereum.org/EIPS/eip-7702): `keccak256('0x05' || rlp([chain_id, address, nonce]))`.

## Imports

```ts
import { Authorization } from 'viem/utils'
```

## Examples

```ts twoslash
// @noErrors
import { Authorization } from 'viem/utils'

const authorization = Authorization.from({
  address: '0x1234567890abcdef1234567890abcdef12345678',
  chainId: 1,
  nonce: 69n
})

const hash = Authorization.hash(authorization) // [!code focus]
```

## Definition

```ts
function hash(
  authorization: Authorization,
  options?: hash.Options,
): Hex.Hex
```

## Parameters

### authorization

* **Type:** `Authorization`

The [`Authorization.Authorization`](/docs/utilities/authorization/types#authorization).

#### authorization.address

* **Type:** `abitype_Address`

Address of the contract to set as code for the Authority.

#### authorization.chainId

* **Type:** `numberType`

Chain ID to authorize.

#### authorization.nonce

* **Type:** `bigintType`

Nonce of the Authority to authorize.

### options

* **Type:** `hash.Options`
* **Optional**

#### options.presign

* **Type:** `boolean`
* **Optional**

Whether to hash this authorization for signing.

## Return Type

The hash.

`Hex.Hex`