The 21 Bitcoin Computer The 21 Bitcoin Computer is the first computer with native hardware and software support for the Bitcoin protocol It is designed for developers to easily build Bitcoin-payable apps, services and devices Operate it as a standalone computer, or connect it to any Mac, Windows, or Linux machine Has a suite of pre-configured Bitcoin-dependent software, and includes a 128 GB SD card loaded with a full copy of the Blockchain Includes all the items you need to get started - including a WiFI adapter, laptop-to-device cable, Raspberry Pi 2, and power supply