London Bullion Market Association (LBMA) and the World Gold Council (WGC) announced Monday that they are collaborating to develop an “international system of gold bar integrity, chain of custody and provenance” that’s based on blockchain technology developed by companies aXedras and Peer Ledger. The ledger will be used to register and track gold bars at each stage of the production and distribution cycle, including mining, vaulting and purchase by jewelry manufacturers.