Kn-X
Kn-X enables the exchange of useful, bluntly honest information between anonymous participants. Historically, it has been difficult for an information seller to convince a buyer of the (1) usefulness and (2) accuracy of the information without actually providing the information ... at which point the seller is no longer able to charge for it. Kn-X solves (1) by forcing information exchange into individual questions with a well defined set of possible answers. Kn-X solves (2) by enforcing a protocol that results in the answerer making money if correct and losing money if incorrect.
