The Cloud Signature Consortium is a nonprofit association of industry and academic organizations committed to building standards for cloud-based trust services that support web and mobile applications and comply with the most demanding electronic signature regulations in the world. We provide an open technical specification that makes solutions interoperable and suitable for uniform adoption in the global market. This effort was inspired by the need to meet the highest level requirements of the European Union’s Regulation on Identification and Trust Services (eIDAS), but its impact is global as demand for highly secure digital solutions continues to rise.