Every Ether Card produced comes with this guarantee:
If you can present an Ether Card with untouched scratch panel, but whose account has an outgoing transaction, or a card whose private key is incorrect or unreadable through no fault of your own, we will refund the lost funds, up to a total value of 5 ether, from our guarantee account. This guarantee is valid for one year from the date of manufacture of each card.
That means that if someone else somehow spends your funds before you scratch off the private key, or you scratch it off and find the key is unusable (for example, due to a printing error), we will refund any losses up to a maximum of 5 ether.
If you’ve already scratched the panel, we can’t refund you for any unexpected withdrawals, because there’s no way to verify how the transaction happened. Likewise, if you use sandpaper on your private key, feed it through a shredder, drag it behind a car, or give it to your dog, we can’t be held responsible for any losses due to the key becoming illegible.
Currently, we hold the position of both owner and auditor; as ether.cards grows and matures, we expect to find trustworthy individuals to appoint as independent auditors.
We think that the contract provides a good way to reduce the level of trust you have to place in us, both by providing compensation, and providing concrete proof of our good behaviour, and we hope you agree.