Idea: Blockchain CAPTCHA

[Marc Draco]

Apologies if this is the wrong list, but you seem the most likely candidates to know how possible/practical this is.

I hate captchas as much as the next guy and probably more than a lot of people because my sight isn't what it used to be. However, privacy is more of a concern and I have a hate-hate relationship with Google that gets deeper with every piece of web it steals/buys.

Since it bought ReCaptcha I've found myself increasingly in a position where I can't avoid Google as it's preventing access to sites I need to access (including some government ones).

Hence it seems we need a more open and privacy respecting solution for "essential" services. I don't understand enough of blockchain to  know how practicat this is but it does appear to offer a potential solution to the problem of anonymous (anonymising)  Turing tests.

I hope we can get some positive ideas here - if it's not possible or practical, then that's great but I've been upfront about how I feel about Google (and others) and I feel strongly that we need to take back the web a little bit at a time: the way that Tim B-L intended.

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