ChorSSI: A BPMN-Based Execution Framework for Self-Sovereign Identity Systems on Blockchain

The digital age has made identity a crucial aspect of online activities due to our increasing reliance on digital platforms. This has led to the development of different identity management systems, relying on centralised infrastructures but exposed to security vulnerabilities. Self-Sovereign Identity (SSI) is a promising alternative, as it allows individuals to control their personal data and securely share it with others without relying on a central authority. However, developing such systems and executing the related operations is complex and challenging, especially for non-expert users. To simplify the development process, we propose ChorSSI, a BPMN-based framework that supports the modelling of an SSI system and the execution of the related interactions. The design relies on BPMN choreography diagrams, permitting the representation of SSI interactions between parties in a distributed manner. The proposed framework was implemented and tested over the real Chromaway property transaction case study.