In the
Galactic Milieu, we introduce players to the general concept of bitcoin, the technology, by having a number of nations that use blockchains for their national currencies, and we mention actual bitcoins in particular by attributing them to the legendary/mythical "Hacker" nation.
Thus we take a soft-sell approach. The fact that a Hacker known as Satoshi actually visited the mythical planet "Earth" and introduced the "Hacker" currency, Bitcoins, there early in the 21st century is just a bit of historical trivia, players can have fun with various other blockchain-based currencies, hopefully ones they can actually realistically mine some of for themselves, before worrying about the actual real live bitcoins that, it turns out, someone known as Satoshi actually *did* introduce here on Earth in the early 21st century.
The thing is, the "Hacker" nation is so insanely advanced that their currency is ridiculously valuable, even more valaube than those of the very powerful and advanced Brits, Canucks and Martians. Plus, the Hacker nation is approximately as mythical as
the planet known as Earth, so it is far more likely that players will find themselves dealing with one of the "big three" national currencies - United Kingdom Britcoin (UKB), Canadian Digital Notes (CDN) and Martian BotCoins (MBC) - or the currencies of the largest intergalactic megacorporations General Mining Corp (GMC) and General Retirement Funds (GRF), or even the relatively new United Nations Scrip (UNS) than actual Bitcoins; and probably often simply using bitNicKeLs, which all of the preceding use as the small-change denomination for day to day stuff smaller than, say, battlestars or space-stations or leases of entire planets or suchlike. Even bitNicKeLs are actually pretty hefty really for small game stuff like buying a beer, so individual-adventurer scale players will thus tend mostly to use DeVCoins or, if relatively well-healed, GRouPcoins.
It is probably not necessary to build into the games software for directly dealing with blockchains at all. It should suffice that tokens be used, or even that the various coins are simply assigned a relatively stable value in copperpieces, silverpieces, goldpieces, platinum pieces etc and use these normal familiar tokens in game, only bothering to actually directly use blockchains when sending funds to other players for use in possibly some other game (aka, some other sub-game of the meta-game, since actually hacking the code of all the subgames to make them smoothly transfer stuff between them is probably lower priority than simply getting them all working and working out what exactly they do each have to offer to the others in terms of export and import opportunities.)
The big thing that blockchain based coins have to offer for gaming is precisely this ability of the players to move them from game to game. They are rather like "real money" in that way, except that in most games you usually find in practice that you cannot in fact move "real money" out of a game. Most games explicitly forbid you from moving "real money" out of the game, you can only put it in, not take it out.
Basically it is simpler and more generic/homogenous to move cryptocoins from game to game than it is to move, for example, specific types of starship, or specific species of played character having specific skills and experiences and vital-statistics. Games tend to represent the latter types of things in such different ways that each thing to be shipped between games can involve a huge amount of theoretical work just to formulate the conversion algorithms before even getting to actually implementing them. But fungible "money" is an item many games represent quite similarly, that is, as a numeric value having various uses/effects in the game. So money seems the simplest place to start in weaving together many games into a larger metagame/economy... Your rich uncle who runs a village on a "Devana" based planet might not be able to come kill rats in the sewers with you in the Crossfire RPG or CoffeeMUD MUD based city you live in, but he can send you pocket-money or buy shares in the XNova-Redesigned or 2Moons based intergalactic mining venture you intend to finance with the loot you find in those sewers...
-MarkM-