Luckily most coins are alike so given a working module to plug a cryptocurrency into minecraft and/or minecraft clones pretty much any cryptocurrency should be able to work with it with trivially simple changes (port number, maybe, maybe not even that; and cosmetics such as what name/symbol to display).
So really the coin itself isn't the important/interesting thing here anyway, the module is; people could go ahead and use it with real bitcoins instead of mucking around with some obscure newfangled coin, or maybe litecoin or devcoin or whatever if bitcoins are considered "too valuable" for use in games...
-MarkM-
Well, Blindfolded did have a Minecraft server set up with an integrated payment system denominated in LTC. Problem with that was it was right before LTC became valuable. I deposited >1,000 LTC onto the minecraft server, just to find out they would hit a few dollars each in a week or two. After that the server became inactive, because no one wanted to use a coin that was worth that much for game transactions.
Take a look at UKB, CDN, MBC, GMC, GRF, UNS, NKL game-currencies at
http://galaxies.mygamesonline.org/digitalisassets.htmlThe problem I expected with game currencies was players dumping them for hookers and blow (fiat, groceries, rent, whatever) in preference to spending them on in game items.
When you can make $5000+ just by shipping five million units of Deuterium to a General Mining Corp depot, how long will it take for so many people to be offering to ship that much deuterium for less than that price that the price drops to maybe a buck per five million units?
If your game items are not being bought by means of auctions or "exchanges" (markets) similar to the various coin-and-fiat "exchanges" then I guess you can expect problems. If people were bidding litecoins (or millionths of litecoins, or whatever) to buy stuff in the game then prices should simply get worked out by the market. If litecoins go up, pickaxes or whatever might well by comparison go down.
I actually used microbitcoins in a MUD for a while and it did not attract anyone to play despite the fact it meant in effect I was giving out free microbitcoins to players.
I went back to just using the normal default goldpieces the MUD normally used, it seems to work out simpler for people to go trade that currency on an "exchange" for whatever other currencies cryptocurrencies etc they might like than to mess with all those external currencies on a waterskin by waterskin, dagger by dagger, pound of meat by pound of meat basis in the game.
The Brits, Canucks, Martians, General Mining Corp, General Retirement Corp, (galactic) United Nations etc though seem to maybe have been on to something with their claims as to how best do things; it is a pity that they were unable to obtain enough hashing power to continue to use blockchains for their currencies as I never expected any of them to outperform bitcoin, I always expected bitcoin would remain more valuable than Martian BotCoin. It has been interesting watching it play out.
-MarkM-