Huh? I know lots of people who have bank accounts in other currencies. Any taxes due on them obviously have to be paid in USD but there's no inherent law against it afaik.

Really, which bank? Is it a true foreign currency account, or based on that currency's index. Personally interested.

Offhand, HSBC and the Royal Bank of Canada in Canadian currency. Pretty sure you can open an investment account with Interactive Brokers in multiple currencies although that's not a true bank account.

You might have to go to one of their foreign branches to do it though. I don't know if you can just show up at a branch in Iowa (for example) and they would know how/be able to open an account denominated in another currency.

Do you think it's illegal in the US to trade your car for two motorcycles?

If not, why do you feel it's illegal to trade your house for some Bitcoins?

No part of what you said is accurate.

Financial transactions may be conducted in any currency. If they must be reported on your income tax return, they must be reported in both the currency used and USD (if different). You can own a bank account in a foreign currency; there is simply more paperwork involved for the customer and the bank.

Which bank?

"In the United States, financial transactions must be done in US currency"

It's not helpful to make things up from your own imagination.

I still have no idea where the Secret Service fits into this. I will admit there is a tax issue about what the realized gain or loss is by trying to attach a value to the bitcoins, but that's an IRS issue and no one is going to come and raid your house.