with a digital signature and its incorporation into a blockchain for example it is possible to check the authenticity and uniqueness of radio frequency identification tags used to track parts through a supply chain the international organization for standardization iso created a technical committee on blockchain and dlts isotc the standardization sector of the international telecommunication union itu established a focus group on applying dlt the european telecommunications standards institute etsi produces a variety of standards in the telecommunications industry including those that enabled key global technologies such as gsm g g dect and smart cards