Wired published an article about using blockchains and cryptocurrecnies in purchasing in-game assets.  I pointed that BlueDragon has been working on that for over 5 years and the link to Blakezone and to this forum thread.

The article is probably paywalled but it currently here https://www.wired.com/story/blockchain-turning-in-app-virtual-goods-assets/  I hate paywalls but I get Wired for work.