# Purpose of the Address Resolver Document

To use the DARP protocol in a supported application a user must register a DID Document that includes a service endpoint that DARP compliant applications (wallets, dApps, browsers, etc) can use to access an Address Resolver Document (ARD) which stores resolution information for a given Address Name. An example of how the Address Resolver Document may be structured is as follows:

```javascript
{
  "addressName": "myname.address",
  "addresses": [{
    "ada": "addr123456789abcdefghijklmnopqrstuvwxyz123456789abcdefghijklmnopqrstuvwxyz123456789abcdefghijklmnopqrst",
    "btc": "1PC9aZC4hNX2rmmrt7uHTfYAS3hRbph4UN",
    "http": "www.myname.com"
  }],
  "subNames": [{
    "addressName": "iohk.myname.address",
    "addresses": [{
      "ada": "addrabcdefghijklmnopqrstuvwxyz123456789abcdefghijklmnopqrstuvwxyz123456789abcdefghijklmnopqrstuvwxyz123",
      "http": "54.206.19.82",
      "gps": "22.277478493216226, 114.16839175078059"
    }]
  }],
  "timestamp": "2020-12-17T06:35:22Z",
  "signature": "DtEhU3ljbEg8L38VWAfUAqOyKAM6-Xx-F4GawxaepmXFCgfTjDxw5djxLa8ISlSApmWQxfKTUJqPP3-Kg6NU01Q"
}
```

{% hint style="info" %}
NOTE:  An Address Resolver Document can include more than just cryptocurrency addresses, which means over time entities can begin to manage all their address resolution requirements using a common protocol. 
{% endhint %}

While Decentralised Address Name Registrars will likely host users Address Resolver Documents as part of their service, the user is free to store it anywhere they want (e.g. IPFS, a Cardano SPO, a private server, Google Drive) as long as the endpoint registered in the DID Document is accessible.

Consideration is also being given from providing a mechanism to include multiple ARD endpoints in the DID Document.  This will allow a user to store their ARD in distributed locations for redundancy purposes (i.e. if a hosting location becomes unavailable).


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