BBOD is a hybrid, semi-decentralized exchange and margin trading platform that provides a trustless, real-time, high-speed trading experience in conjunction with blockchain based settlement. By centrally managing trade matching and Ethereum transaction dispatch, BBOD enables users to trade on margin and exchange coins in real-time without waiting for transactions to mine, fill multiple orders at once, and cancel orders immediately without gas costs. The hybrid architecture offers the speed of a centralised platform while providing the security and privacy of a decentralised exchange.