Earlier quoted context omitted.
When signing up for a trial, the page says: > To activate a trial account, you will need a reasonably modern browser and a phone number that can receive SMS texts. It makes no mention of the use of a "hashwall" ... It gives no indication of what the user's browser is going to do ... Just a progress meter with a note saying it will take about 3 minutes. This feels fishy. Especially if a user doesn't know how to get in…
For the trial hashwall, the browser just does some heavy computations. I guess I should add a warning there, it's probably does have battery impact if you're using a phone for whatever reason. I'll make a note on the UI elements. Honestly hadn't thought about the punycode usecase, good catch.
Yeah, I figured that out, but someone else might think you are trying mine some *coin or something. I am not sure if I would mind it if you did, but it would be good to tell up front what you are doing. It does seem to be a much better than recaptcha.
The fact that it works is good enough for me. I am going fiddle a little more before I sign up, but it looks like this is fills my needs.