Bitcoin companies 21Inc and Coinbase are among the hottest in Silicon Valley / 

A recently released Business Insider list of the 7 hottest fintech companies in Silicon Valley ranks Bitcoin companies 21 Inc and Coinbase at 5 and 6 respectively. Topping this list was the credit card processing company Square and mobile-payment system CardSpring came last.

About 21 Inc.

The secretive San Francisco-based 21 Inc. has recently developed a chip called BitShare for Bitcoin mining which can be embedded into any internet-connected device as a standalone chip or integrated into an existing chipset as a block of IP to generate a continuous stream of digital currency.

Interested parties can request a dev kit by signing up on the website.