The findings suggest NO cryptocurrency token is legal, because only the Federal Reserve and US Treasury in collaboration with Congress has any legal possibility to create ANY currency. By default this makes ALL cryptocurrencies illegal because companies at the state level cannot issue currencies. However, if the company is "overseas" then I don't think the same rules apply. Except of course if the crypto-currency sells to US citizens on the open market. Bottom line, based on my research there is NO legal cryptocurrency yet. Not Bitcoin, Not Ethereum, not Quintric...NONE!