Block Inc logo is seen displayed in this illustration taken, April 10, 2023. Dado Ruvic | ReutersJack Dorsey says that his payments company, Block (formerly Square), is expanding its bitcoin mining ambitions from designing chips to developing a full bitcoin mining system.In a post on Tuesday, the global tech firm announced that it had finished the development of its own standalone three-nanometer bitcoin mining chip and was now in the process of working through the design with a "leading global ...