Different authentication methods then captchas while using Tor?

If there weren’t captchas which are unpossible to solve for a human Tor would insane.

But if you for example want to make a post on Dread, then you have to do 4 Captchas before that.

Maybe you could just do a few captchas and then generate a key to prove that you solved them. Then you can go to other services and sey: “Hey, I already proved several times that I am human.” But then you are not anymore anonymous, because you are linkable to the key.

But there has to be a solution