And, if they do, users have no recourse, Nikiforakis said, especially because they’ve lost cryptocurrency, rather than regular money. Cryptocurrency, a form of digital money that has lately soared in price, relies on cryptography to make sure that only the owner of a “wallet” can spend the money it contains. But, once that wallet is stolen, that security works to protect the thief, meaning it’s nearly impossible to get it back — even with a court order.