Do coins expire?

Just wondering

Usually they don't. We have a clause about that for our own safety, but it has never been put to use as far as I know.
The only case where an expiration was enforced was when our database was lost and people received a refund of their coin history to start over - people had 60 days or something like that to use those coins after restoring their accounts - so it was a special case dealing with refunded coins.

Thank you for the reply!