<https://secure.gravatar.com/avatar/36ddd62fd8d7cca9ea6a78acc28cb548?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://autoshopping.es/general/bitcoin-basics-what-you-should-know-before-investing>