What are the hurdles to creating a "proof of human work" coin?

[mokimarket]

In other words, are there any schema to create a Hard to solve but easy to verify problems that can be completed more efficiently by a human over a computer

[elite3000]

don't know

maybe a coin mined by captcha solving?

but I think human work should be directed to more productive things

[mokimarket]

don't know

maybe a coin mined by captcha solving?

but I think human work should be directed to more productive things

Yea I heard the captcha solving idea, I was wondering if there were any other schemes devised.

[Almeida]

Anything non-deterministic would do. But how exactly is this advantageous?

[mokimarket]

Anything non-deterministic would do. But how exactly is this advantageous?

I don't know if it would be advantageous or not, I'm just curious if it could be done

I was thinking maybe a visual cryptography schema, but not really sure.

[imhoneer]

Of course have. You have to show the photo and ask what emotion it causes. Each time there should be a different photo.

For example, this is fear:




And this is joy




The pictures themselves must be surreal, so that the neural network can not tune.

[Vivisector999]

I would say the best place to look would be at Coins like Curecoin and Gridcoin. 

Both check occasionally for how much non mining "work" was completed then pay out accordingly.  At least in Curecoin's case, since I "mine" for them.  They have 2 sides.  1 side is the regular mining of the coin to keep the Blockchain alive, which splits the profits between the 2 groups.  You would then need to come up with some measurement and counter for the proof of Human Work, and divide the rewards according to how you see fit.  There could be other ways, but that is just 1 that I know is being used today that is similar to your answer.

[Almeida]

Anything non-deterministic would do. But how exactly is this advantageous?

I don't know if it would be advantageous or not, I'm just curious if it could be done

I was thinking maybe a visual cryptography schema, but not really sure.

It can be done, the same way that hashing, or validating a bitcoin block, using paper and pencil is possible. It just doesn't bring any apparent advantage.

[lockept93]

DNA Coin

https://bitcointalk.org/index.php?topic=1949893.0