According to Coindesk, a recent recruitment announcement by Seattle-based e-commerce giant Amazon revealed that the company is recruiting a senior software engineer to join its "advertising finance technology team focused on blockchain ledgers." The job description stated that the new team in Boulder, Colorado, will focus on billing and reconciliation systems to provide transparency across international financial data. The team added: "This is an opportunity to use blockchain technology to define a new area of technical architecture for Amazon's advertising business." When asked more details, a spokesman for Amazon said that The team "doesn't have anything to share at the moment." It's unclear what kind of blockchain Amazon is going to use to advertise. Previously, the Amazon Cloud Business Amazon Web Services (AWS) blockchain team built a proprietary blockchain called the Quantum Ledger Database (QLDB), and AWS's hosted blockchain service was connected to Ethereum and Hyperledger Fabric. .