A user answers a question on a question-answering site and attaches a ransom. The site holds the answer hidden until other users have together contributed enough money to cover the ransom, at which point the answer is posted publicly.
A user can establish a trustable reputation by whatever means, e.g., through previously answered questions (perhaps for free).
The site employs trusted moderators to verify that a hidden answer is actually a good answer. Moderators can be publicly graded as answers become revealed.
Some market tricks like being able to search for high priced unmet ransoms and contributing an answer for a ransom less than that, driving prices down.
Variations on the same theme for public goods and for porn.
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