That is a nice idea. So bit similar to mCaptcha [0] that uses PoW algorithm, mentioned in other comment [1] in the thread. [0] https://mcaptcha.org/ https://mc

That is a nice idea. So bit similar to mCaptcha [0] that uses PoW algorithm, mentioned in other comment [1] in the thread. [0] https://mcaptcha.org/ https://mcaptcha.org/ [1] https://news.ycombinator.com/item?id=32339902 https://news.ycombinator.com/item?id=32339902