Dr. Adam Back is co-founder and CEO of Blockstream. Having worked on e-cash protocols since 1995, Adam is also an applied cryptographer and inventor of the hashcash proof-of-work and decentralized mining used in Bitcoin. In addition to implementing credlib, he was an e-cash consultant to Nokia and later to Credentica (acquired by Microsoft). Adam was an architect and cryptographer at Zero-Knowledge Systems working on its Freedom network, a precursor to Tor. He has also consulted for leading security companies, including oneID and VMware. Adam holds a Ph.D. in distributed systems and computer science from the University of Exeter.