About: http://webisa.webdatacommons.org/227411279

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Every article on the subject, including your blogpost, says it was a voluntary fee.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com