Once a week, after midnight, a hidden district opens. Sealed bids, one-of-one items, favors enforceable by the city. Anything unsold burns at sunrise. You were either invited or you weren't.
citizens-city/night-market) from an existing resident, non-transferable, expires after one visit.amount|wallet|nonce during the commit phase. At dawn, reveal the amount and nonce. Unrevealed or invalid reveals vanish.