I don't think any of them have even raised to the level of "interesting" compared to the scale of what is being proposed ("rework the entire global economy"). I am aware of them. UBI experiments need to be about UBI, not about things that vaguely resemble it. In particular they need to be large enough that the hypothesized bad effects could even be witnessed, as most of them revolve what will happen once people are habituated to it. For them to be useful, you need to not be referring to them in the past tense because they should still be ongoing, and indeed, really just at the beginning of their run. Most of them are the equivalent of claiming free college works because they went into a single small community and promised anyone who wanted to that they could attend the first three weeks of college for free if they liked; the results hardly matter.
"If you had you would say: based on my understanding of the forces at play, I thought BitCoin would be dead. BitCoin has thrived instead so my understanding of the forces at play is less than I had estimated."
I did say that. I just used fewer words.
There have been lots of previous experiments with stuff sort of similar with UBI. While there are many problems with those studies preventing their use as any sort of conclusive proof, they have been predominantly neutral or positive. Yet I don't see that accounted for in the predictions of doom and gloom any of the UBI skeptics. If this experiment goes well, you need to do more than just admit you were wrong about the experiment, you and other skeptics need to lower your confidence in your overall skepticism of UBI.
> while I remain a cryptocurrency skeptic, and a BitCoin skeptic in particular, I expected BitCoin to be totally dead by now, and it is not. I say this to demonstrate that I can indeed eat crow.)
It sounds to me like you have not eaten any crow. If you had you would say: based on my understanding of the forces at play, I thought BitCoin would be dead. BitCoin has thrived instead so my understanding of the forces at play is less than I had estimated. Based on that, I am now less skeptical (or less confident of my skepticism) of the future crypto currencies. (I share your skepticism of the future of BitCoin, but I am far less certain of that skepticism than I used to be for these exact reasons)