In April, the city of South Burlington, Vt., issued what is considered the first property deed using blockchain technology. The effort was little more than a pilot project that mostly involved the company which provides mobile and Web-based property transactions. But the transaction has been heralded as a first and a glimpse of government’s future in which information can be stored and exchanged by a network of computers, without a centralized host. Often referred to as decentralized ledger, blockchain makes it nearly impossible to alter or hack the data.