&gt; what is the benefit of using the &quot;21 Bitcoin Computer&quot; here<p>Well, so they can advertise it.<p>I don&#x27;t see why using it is any better than using any other Bitcoin API, e.g. Coinbase. A simple proxy library that would allow users after they paid a cent or so would be interesting, although I guess it&#x27;s pretty much the same as all the wifi hotspots.