<http://schema.org/url>
<http://www.businessweek.com/articles/2014-06-16/could-bitcoin-miner-ghash-dot-io-control-the-entire-bitcoin-system>
<http://www.bloomberg.com/bw/articles/2014-06-16/could-bitcoin-miner-ghash-dot-io-control-the-entire-bitcoin-system>