Adam Back

Adam Back is a computer scientist and cryptographer who first proposed the technology behind Bitcoin, known as "Hashcash." Hashcash is a system that makes it difficult to spend the same digital currency more than once. This system is implemented in Bitcoin and other digital currencies, and it prevents people from "double spending" the same money. Adam Back also worked on a project called Blockstream that focuses on developing services and products that use blockchain technology to make transactions more secure and trustless.