
Juan Zarate, the former deputy assistant to US President George W. Bush who helped invent the financial embargoes that cut off terrorist funding after 9/11, is worried that cryptocurrencies could be used to undermine those same embargoes. Cryptocurrencies permit obfuscating financial paper trails -- some cryptocurrencies are designed for outright anonymity -- which can protect people looking to circumvent embargoes. Zarate is a blockchain and cryptocurrency advocate, but sensibly advises security precautions are needed.