That's smart. The seller still needs to make sure the buyer can't get a transaction transferring the coins back into a wallet under their control confirmed bef

That's smart. The seller still needs to make sure the buyer can't get a transaction transferring the coins back into a wallet under their control confirmed before the seller can move them out. (I'm now vaguely curious about how the financial transactions on shipping container sized sales of guns/drugs work. But I'm not about to Google _that_...)