Adam Back is a British cryptographer and crypto-hacker with a Computer Science and distributed systems Ph.D. from the University of Exeter. He invented Hashcash, which is the proof-of-work algorithm used for decentralized mining in Bitcoin. Today he is CEO of Blockstream, a company that seeks to further the development of bitcoin and blockchain technology. He has also consulted for leading security companies, including oneID, Vmware and QWcap. Most recently, Adam co-founded Picorp, which was acquired by EMC and where he was CSO of the company’s consumer division, Decho.