Private online digital currency systems offer people accessible, convenient, and inexpensive everyday financial tools outside of traditional bank-owned and operated platforms. Digital currency systems facilitate local and international fund transfers, online and offline payments, and simple cash-to-digital everyday financial products without the need for a conventional bank account of any retail bank product. Over the past several years, Bitcoin has grown into an efficient person-to-person and person-to-business payment system without the backing of any bank or financial institution. This...