Middlemen have had an important role throughout economic history. They have created markets and assumed risk. But today, it seems like middlemen, or more correctly, intermediaries, siphon off high transaction fees, are slow and inefficient, and fail to protect privacy and information. The elegant technology behind bitcoin and blockchain can reduce the power of intermediaries by decentralizing control. This module explores how blockchain, or distributed ledger technology, can allow us to exchange value electronically. Students will explore how this has the potential to reshape society.