> Ugh. Yes, we need central banks, if for no other reason than that distributed systems are hard. I can't count how many people there are who assume that becau

> Ugh. Yes, we need central banks, if for no other reason than that distributed systems are hard. I can't count how many people there are who assume that because the problem is too hard for them, they need the government to intervene. > but at 1000x the energy expenditure and with no guarantee of avoiding a 51% attack by a coordinated network of rogue actors. Was double-spending a major problem prior to 1917? No, because there were assets that couldn't be double spent to move around (cash) as well as a somewhat decentralized trust-based system between banks that didn't fail just because the government wasn't there to hold your hand. We don't need cryptocurrencies for decentralized banking transactions, but they could definitely optimize the system and bridge the gap for the modern world, where money moves to the other side of the world frequently (not v0 Bitcoin-based protocols like you are familiar with, but assets which use a combination of proof-of-stake and master nodes which prioritize reputation in the system over computational power -- Dash is one example, although not yet good enough for this purpose). I suspect the environmental/economic cost of maintaining such a network would be much less than physically moving cash or gold around for backbone transactions. One somewhat useful (although still not without controversy) function central banks perform (and really, it's mostly the US Fed for most of the world's financial system) is indeed clearing bulk transactions between banks worldwide. However, the true value is the ability to reverse "mistakes" or theft -- for a VERY short time, we should note -- although this is also a negative if you are on your government's naughty list. Cryptocurrencies enable both more autonomy (the Saudi government wouldn't necessarily be able to freeze the assets of a dissenting citizen who is trying to escape, for example), and less ability to reverse mistakes, so I am torn on whether or not any existing cryptos would be ideal for this role, although I'm sure emerging cryptos/upgrades will continue to be better suited. In any case, it's kind of a tangent to the whole central bank discussion.