<https://secure.gravatar.com/avatar/0d495c65f6a90e8f00886387504c6e67?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://cryptogourou.fr/types-de-crypto-monnaies-explication/>