March 26 (UPI) -- Fannie Mae on Thursday agreed to begin accepting mortgages that are backed using cryptocurrency. The mortgages will be offered by Coinbase and Better Home & Finance, which said the creation of what it calls a first-of-its-kind cryptocurrency-backed mortgage product could allow more Americans to afford homeownership. Although there are companies already offering mortgages backed with crypto-assets, this is the first that Fannie Mae, and its federal conservator, the Federal