Quote from: Jeff Garzik on December 08, 2010, 2:07:22 PM UTCIf a past transaction becomes invalid and disappears, the website cannot avoid potential loss, because the user has already received their PayPal-USD or LR-USD or Pecunix GAU and disappeared.
That’s not always the case. Sometimes the customer will have a balance at the website. The operator of the website will certainly want to know if a past transactions becomes invalid and disappears.
Sure, and that’s easy enough to track with transactions.