Digital currency. According to Caijing. Bank icons are issued by banks according to the blockchain. It can be used in banks, securities companies, insurance companies, hospitals, universities, e-commerce and other social transactions, and can also be used for cross-border payment. So the bank icon is a kind of digital currency. ICON is a decentralized network composed of various independent associations connected by blockchain. In the world of ICON, any participant can plan a new blockchain project, which will be connected with other projects to create another new world.