I could imagine extending my Catallax system to support crowdfunded bounties. It would work a little differently though: in my system, the money is sent to the escrow agent up front and held. If the goal isnt met, the money is refunded to funders. If the goal is met, the money is sent to the developer.

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Whoever you trust to play the role. Probably based on reputation. Either programmatic reputation or "analog". Would you trust Jack or fiatjaf to hold some sats and assess the work product? I would. Or some npub who established himself as a reputable escrow agent over time.