Idea for a NIP to improve Nostr. Enable a user to attach a smart contract to a note, so that if someone replies to satisfy the conditions on that contract, they receive the reward that is pledged. This would allow users to ask important questions for which an answer (by the public at large or requested from a specific individual) is valued enough to stake a monetary reward. This would greatly incentivize engagement, especially when lowly users are seeking the attention of a prominent figure. It makes it worthwhile for big names to reply to a nobody, if there is a payoff.