Adam Back is a British cryptographer and cypherpunk, widely recognized as the inventor of Hashcash, a proof-of-work system foundational to Bitcoin mining. He is the co-founder and CEO of Blockstream, a leading blockchain technology company focused on developing Bitcoin infrastructure and sidechain solutions like the Liquid Network. As an angel investor, he focuses on pre-seed and seed stage investments in Privacy/Security, Cloud Infrastructure, Crypto/Web3, Consumer Internet, and Web3/Blockchain sectors.