: Here's a few: 
 :* http://www.psmag.com/navigation/business-economics/what-comes-after-bitcoin-future-of-cryptocurrency-61660/ 
 :* http://www.technologyreview.com/news/513606/big-name-investors-back-effort-to-build-a-better-bitcoin/ (just a content tag, but still) 
 :Additionally googling "ripple cryptocurrency" yields loads of borderline sources like tech blogs and opinion pieces like the seattlepi.com one you linked, originally from here I think. Since we are not trying to establish notability here, just solve a nomenclature issue, one reliable source ought to cut it.