— “Those are among the more visible recent fruits of a well-funded campaign by Mr. Orban in the United States that stretches back a decade and now stands as a case study in how governments around the world seek to shape policies and debates in Washington, sometimes raising concerns about improper foreign influence in U.S. politics.”
Wallets used by cryptocurrency exchanges are somewhat vulnerable to hacking. For instance, Japan-based Bitcoin exchange Mt. Gox shut down and declared bankruptcy a few years back after hackers systematically relieved it of more than $450 million in Bitcoin exchanged over its servers.

Unlike the money you save in a bank insured by the Federal Deposit Insurance Corporation (FDIC), “If a virtual currency company fails – and many have – the government will not cover the loss,” the Consumer Financial Protection Bureau warned in a 2014 notice about cryptocurrency (its most recent guidance).
Blockchain technology. Enables the electronic payment system for virtual currencies, but not tied to any specific currency. Companies are using blockchains to create a permanent record of transactions of such things as sales of investments, corporate records, and legal documents.