Witness Chain is blockchain company based out of Bengaluru, India and Princeton, USA, building a Proofs of Bandwidth system for Trustfree Networking.

Witness Chain is a proof system for decentralized networks such as Helium. It provides proofs (or witnesses) of network performance, which are like decentralized speed tests or ping tests that work without requiring trusted servers and devices. It facilitates trustfree networking where any device with any radio can offer network to any user or enterprise.