As digital technologies for tracking and tracing mineral commodities continue to expand, this chapter evaluates the role of blockchain-inspired systems and the organizations promoting digital certification technologies in mineral supply chain management. Drawing on research conducted in the cobalt mines of Kolwezi in the Democratic Republic of Congo and in mining sites affiliated with De Beers’ GemFair program in Sierra Leone, the chapter explores two key themes. First, it examines how transparency shapes both cobalt –an essential component for enhancing lithium battery performance – and diamonds – an emblem of hyper-consumption – within the broader digital transformation of the extractive industries. Second, it considers this digital turn as an effort to establish disintermediated trust in certification mechanisms formerly reliant on third-party verification. The chapter argues that, while digital transparency is presented as the pinnacle of technological accountability, it simultaneously operates through practices of concealment.