The CEOs of Mastercard and Wells Fargo echoed skeptical comments on the utility of blockchain technology made earlier this week by Bank of America’s head of technology. Speaking to CNBC on March 28, Wells Fargo CEO Tim Sloan said that while ignoring blockchain would be a “bad idea,” the technology has been “way oversold.” Mastercard CEO Ajaypal Banga added that blockchain technology has “interesting possibilities,” but said that “the business model is not proven.”