Core Viewpoint - Donggang Co., Ltd. (002117) announced on September 26 that its electronic invoice customers include major domestic e-commerce platforms, public utilities, insurance, finance, catering, pharmaceutical chains, supermarkets, logistics, and education sectors, highlighting the company's diverse client base and the establishment of a blockchain electronic platform for data services [1] Group 1 - The company utilizes blockchain technology to provide data services for electronic invoices [1] - The electronic invoice business primarily generates revenue through system service fees [1]