Actually I suspect including banks and stock-exchanges into the geography of the game would be seen by most here as far from seamless, as I suspect most here prefer to just buy and sell and swap and trade crypto assets without having to have some avatar/character on some world make its way potentially though dangerous parts of a city to the financial district to visit their broker or the actual stock-exchange, risking pickpockets and muggers and buskers and mendicants and gosh knows what else just to do a crypto transaction!

So far I am first getting the whole kit and kaboodle playtested and up and running and working.
Someday if all goes well and enough money is coming in doubtless more and more parts of the mechanics could be coded into smart contracts but more important first is to actually determine in real life whether the mechanics actually work well and to fine-tune them and so on.
Until we have a whole complex economy successfully up and running and sustainable it seems far far too early to start trying to carve it in stone as it were as smart contracts, and if the smart contracts are not graven in stome as it were then the whole point of using them at all is undermined so why bother until absolutely ready with perfectly tested and proven mechanics worthy of indelible coding...
-MarkM-