Coinbase has become one of the leading cryptocurrency exchanges in the world. The systems we’ve built to satisfy the increasing volume of sends and receives on a variety of blockchains is called our “hot wallet”. Operating these systems require special technical expertise and a strong understanding of the nuances of these new technologies. This talk describes how the systems operate, challenges we’ve faced, and how we’ve overcome these constraints to provide our customers with a world-class cryptocurrency product. The talk will include topics such as fee estimation, coin selection, change splitting, UTXO consolidation, and child pays for parent.