Can AI and blockchain be used in fight against deepfake?

Most of us have heard of phishing, we may get an email supposedly from the CEO of the company we work for demanding we transfer some money. As it's the boss, and we are human, and don't always react calmly when our boss aggressively demands we do something, we may well comply. But these days, more people are aware of the danger -- and are likely to check the authenticity of the email. Suppose, however, we get a phone call apparently from the boss, complete with the cadences of the boss's voice that we are familiar with -- we are far less likely to be suspicious. But now, in a variation of deepfake, it has been reported that AI has been used to scam an organisation out of money by impersonating the voice of a company's chief executive.