Gwern wrote an article arguing that Bitcoin is an ugly protocol : Bitcoin is Worse is Better. What does gwern think today?

I actually finished that a month or two ago, so it reflects my current sentiments. No events have substantially changed my opinion, and some reinforce them - for example, I thought it was very stupid for anyone to engage in finalization on Silk Road (releasing your money from escrow to the vendor before receiving anything), and indeed, a big vendor recently scammed buyers out of something like a hundred thousand plus dollars worth of bitcoins by requiring finalization and then absconding.

As with quantum computing itself, storing quantum money would require low enough error rates that you could successfully apply quantum error-correction (if error rates are too high, you introduce more errors during error-correction than you can correct). Before you hit this point you can't do the computations anyway, and after this point it is only a tiny bit harder to keep qubits around indefinitely. (Modern QKD works because you don't have to do any computations on the qubits, in addition to not having to store them.)

If you read the Wikipedia article, you should know that I didn't create Bitcoin but only described a similar idea more than a decade ago. And my understanding is that the creator of Bitcoin, who goes by the name Satoshi Nakamoto, didn't even read my article before reinventing the idea himself. He learned about it afterward and credited me in his paper. So my connection with the project is quite limited.

Needless to say, this is what Wei Dai / Satoshi Nakamoto would say if they were the same person.