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Two others are Hiya and BitMind, which offer free extensions for the Google Chrome browser that flag suspected deepfakes.

Patchen Noelke, vice president of marketing for Hiya in Seattle, said his company’s technology looks at audio data for patterns that suggest it was generated by a computer instead of a human.

It’s a cat-and-mouse game, Noelke said; fraudsters will come up with ways to evade detection, and companies like Hiya will adapt to meet them.

Smith's audience interactions usually start with an innocent "Hiya mate, what's your name?" followed by "What do you do?"

“Hiya, Mrs. Sweeting! How are you?”