I hear that. I'm just thinking out loud coming from a light place of brainstorming. I think audio captcha would great in a stand alone app (not requiring folk to use a network like a cryptocurrency). I'm not a mobile developer so I have no idea how to make this, yet.
One of the early proposed uses of digital cash-like systems was for spam reduction in email by charging a fee for every outbound message (could be refunded for legit callers). An advantage over a captcha is it doesn't use introduce friction for the caller by taking her attention.
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"Nasty little Buddhist"
Seeking via neuroscience and psychology informed dharma.