Block Inc logo is seen displayed in this illustration taken, April 10, 2023. Jack 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 semiconductor foundry." Block a ...