Bitcoin

Borrowers' pledged currency remains held in custody and is ring-fenced. The collateral cannot be re-used to generate yield or secure any other type of financing.

Federal officials directed Fannie Mae and Freddie Mac to study whether digital assets held on US regulated exchanges might someday be factored into mortgage risk assessments.

The regulation of cryptocurrencies gains momentum abroad while a number of hurdles must be cleared before lenders and banks can handle them at scale in the U.S.