In her letter to Treasury Secretary Janet Yellen, Warren cited DeFi, crypto-enabled cyber attacks and unique threats posed by stablecoins as risks to the financial system.
The move is a sign of increasing concern that new forms of private money could disrupt Japan's financial system.
"Prior to this meeting, Vice Chair Quarles, Chair McWilliams and I had talked about potentially putting together an interagency policy sprint team just on crypto because of exactly the concerns you've described," Hsu said.
Armstrong said he visited Capitol Hill to network and help answer questions about crypto.
The Central Bank of Nigeria said its warning to banks on Friday was not a new position, but a reiteration of its 2017 stance on cryptocurrencies.
The surge comes as America's largest library rolls out a crypto regulatory guide.
Cryptocurrencies should be regulated more stringently, a VMWare security executive told U.S. lawmakers, citing a rise in cybercrime during the pandemic.
Commissioner Brian Quintenz called on the industry to form a self-regulatory body and startup execs said oversight is a fact of life at a Yahoo event.
Hawaiian lawmakers are aiming to address cryptocurrency, this time by update money transmission law in the state.