After a successful USD listing the panel tried to show the BCH-style offer
hex, which dollar listings do not have, so the seller saw an error and a
bare Cancel button. The panel now shows the contract address instead.
The gateway pruned listings from its store whenever one electrum lookup did
not show the covenant output. A listing a few seconds old can be invisible
to one server while another already relayed it; deleting it then loses a
real on-chain listing. Absence is now trusted only after 20 minutes; before
that the listing is hidden from buyers but kept.
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