It was really good for first 19 months on GPU mining & currencies like Ethereum & zcash.

There is no value in it being a currency, and it's just a repeat of Tulipmania type groupthink and everyone spreading their crypto-propaganda will end up holding the bag.Feel free to reach out if you have any other questions or concerns.

Are being prepared for a shift to a new currency?

I can send you the Office of Comptroller of the Currency that I used for the above info that I gave to my clients lender.

Now, throughout the last fifty years, and especially in the end of the 20th century, the US Dollar was the global currency. 

For ex.

@Israel SternbuchAny US investor who invests in Poland has a currency risk, irrespective of how the property is financed.

Aside from the normal currency and economic risks, there are significant political risks in the region.  

They have value solely through consent - the same as any other currency (including Dollars, Rubles, Yen and Bitcoin).     

When I am incentivized to keep my money moving (after all, it is called currency for a reason) it benefits many people; who in turn benefit other people by spending the money that paid them.