Please post your opinions about these CAPTchas to use during distribution.
If you have solid reasons to not even consider one option, expose it here.
Feel free to propose any new candidates.
After some feedback is gathered, I'll start a poll.
Is the plan to choose the best one OR pick the best 3 of the above and have 'miners' do one of each per payout ORr are you planning on presenting 3 random captures from the 8 possible? I think the latter might be more secure. Having looked at them they all seem ok and by mixing them up, rather than using the same 3, it would give bots a significantly tougher time. And it always leaves the possibility of adding more (secure) capchas to the pool of 8.
The original plan is to choose the 3 best (more difficult to hack) systems and use always those 3, but I'm open to suggestions.
The problem I see on mixing them up is that some are more time-consuming and difficult to hack than others.
In the case of real people, anyone can just refresh the form until the fastest to complete are shown.
They would save time and therefore claim more coins than other users that don't do that.
Regarding bots, they can hack any 3 of those captchas (3 of 8, i.e. 37.5%) and then automatically reload
until exactly those 3 captchas are shown.
If the form always presents the 3 hardest forms, bots have to be able to hack exactly those 3 (3 of 3, 100%)
to automatically complete the form.