DUST Ledger, a blockchain tracking service led by three physicists, announced that it has joined the SAP Cloud Platform blockchain, through which business users can use inkjet-specific coatings to track items in their inventory and register them in the service books. The company previously received $2.3 million in financing from venture capital firm Kleiner Perkins and received funding from the Defense Advanced Research Projects Agency (DARPA), a subsidiary of the US Department of Defense, for logistics and tracking. DUST Ledger co-founder Ophir Gaathon has a strong background in diamond materials and a Ph.D. in applied physics from Columbia University. His partner Dirk Englund has a background in quantum photonics and is a professor at the Massachusetts Institute of Technology. Another partner, Jonathan Hodges, owns The background in optical system design is a Ph.D. from the Massachusetts Institute of Technology.