The essence of the concept behind cryptocurrency is that we can use blockchain technology in order to directly exchange value on the Internet, without the use of an intermediary like a bank or a clearinghouse. The reason we typically need banks and the like is in order to have a third party certify that a real transaction has occurred by maintaining a ledger that records the transactions. Since blockchain is essentially a distributed ledger, all of the transactions of a blockchain-based currency become the content of the blockchain itself. Because the blockchain is distributed among multiple nodes, the trust factor is supplied by the consensus of the nodes that the transaction occured. There are many other uses of blockchain technology as well. For example, it could be used to create a tamper-proof voting system. Or even allow citizens to vote in real-time on proposed legislation, thus undercutting the need for a representative congress. That's just one example- there are many and most of them have not even been discovered yet! TL;DR We no longer require a third party for two entities to exchange something of value. BTW there is technically nothing prohibiting a POT governor from issuing their own Ethereum-based tokens. There's just no immersive way to exchange them in game.