Wow... blindly speculating yesterday about what Clinkle might be doing -- https://news.ycombinator.com/item?id=5956736 https://news.ycombinator.com/item?id=595

Wow... blindly speculating yesterday about what Clinkle might be doing -- https://news.ycombinator.com/item?id=5956736 https://news.ycombinator.com/item?id=5956736 -- I'd thrown in "ultrasonic acoustics" as a random wild guess. Great to hear that's part of it. Though it'd also be kind of cool to do the transaction in the hearable range... so your phone playing a merchant could make the same sort of 'honking' as old dial-up modems. Not just a novelty, that'd promote the service to everyone within earshot.