# Address definition change

### **Arguments**

* **definition\_chash** `string` *required*\
  Indicates the checksummed hash of the new address definition.
* **address** `string` *optional*\
  When multi-authored, must indicate address.

### Returns

Returns the unit hash.

Example

```javascript
const params = {
  definition_chash: 'I4Z7KFNIYTPHPJ5CA5OFC273JQFSZPOX',
};

client.post.addressDefinitionChange(params, wif, function(err, result) {
  console.log(result);
});
```

### **Learn more**

* 21\. Addresses (page 23) <https://byteball.org/Byteball.pdf>


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