Wabi-Sabi Coin Joins - How to Make a Double Spending Protection Transaction

I remember when I interviewed you three years ago, you mentioned something about pay to end point. At the time it was all the rage. Everyone was talking about it as this way, which defeats blockchain analysis. And there wasn't much talk about it. Some people refer to it as pay join. It's a very beautiful design where the center and the receiver talk to each other in multiple rounds. But yeah, we'll see. There is a lot of complexity and a lot of nuances on this.