Using blockchain in the area is still at an early stage and may not be rolled out fully if regulators have concerns or if the banks don’t fully embrace the concept. Repo traders ultimately may be slow to embrace changes that they fear could be cumbersome or hurt their competitive position. But some bankers have been eager to explore blockchain as a way to save money and to make it easier to meet capital rules that apply to the trades. Autonomous Research estimates that $120 billion worth of capital annually is tied up in transactions between Wall Street firms, and that blockchain could reduce that by $6 billion. Those billions could be returned to shareholders or used to fund more profitable activities.

http://www.wsj.com/articles/bitcoin-technologys-next-big-test-trillion-dollar-repo-market-1459256400