Japanese investment bank Mizuho called Visa (V) the “stablecoin of stablecoins,” arguing that the payments giant has become a core part of the global stablecoin infrastructure. Visa’s expanding network of stablecoin-linked card programs, now over 130 in more than 40 countries, with spending up fourfold year-on-year, gives it a central role in blockchain-based payments, according to the Wednesday report. Stablecoins are cryptocurrencies whose value is tied to another asset, such as the U.S. dollar or gold. ...