# VirtualMaster.getRegistrationHash

Computes the TIP-1022 registration hash for a master address and salt.

[TIP-1022](https://docs.tempo.xyz/protocol/tips/tip-1022)

The registration hash is `keccak256(masterAddress || salt)` where `salt` is encoded as a 32-byte value.

Master addresses must satisfy TIP-1022 registration constraints: they cannot be the zero address, another virtual address, or a TIP-20 token address.

## Imports

:::code-group
```ts [Named]
import { VirtualMaster } from 'ox/tempo'
```

```ts [Entrypoint]
import * as VirtualMaster from 'ox/tempo/VirtualMaster'
```
:::

## Examples

```ts twoslash
import { Address, Hex } from 'ox'
import { VirtualMaster } from 'ox/tempo'

const hash = VirtualMaster.getRegistrationHash({
  address: Address.from(
    '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266'
  ),
  salt: Hex.from(
    '0x00000000000000000000000000000000000000000000000000000000abf52baf'
  )
})

hash
// @log: '0x0000000058e21090d8f4bee424b90cddc2378aefa1bbbfa1443631a929ae966d'
```

## Definition

```ts
function getRegistrationHash(
  value: getRegistrationHash.Value,
): Hex.Hex
```

**Source:** [src/tempo/VirtualMaster.ts](https://github.com/wevm/ox/blob/main/src/tempo/VirtualMaster.ts#L733)

## Parameters

### value

* **Type:** `getRegistrationHash.Value`

Master address and salt.

#### value.address

* **Type:** `abitype_Address`

Master address.

#### value.salt

* **Type:** `Salt`

32-byte salt used for registration.

## Return Type

The registration hash.

`Hex.Hex`