Facebook‘s controversial ‘cryptocurrency‘ Libra could be based on national currencies such as the dollar, the tech giant said on Sunday, following increased scrutiny from regulators and governments in recent months. “We could do it differently,” he said. “Instead of having a synthetic unit … we could have a series of stablecoins, a dollar stablecoin, a euro stablecoin, a sterling pound stablecoin, etc,” David Marcus, the project‘s lead, told a banking seminar.