prochain-sign-service-sample Project setup yarn Compiles and hot-reloads for development yarn start Compiles and hot-reloads for production yarn serve default ads distribute sign url http://localhost:8088/sign test parameter { "adid":"6", "did":"did:pra:MyyHz8so4PU8SPEDCCxD6YD36hFTyKcpoJ" } developer need to config .evn.* file