China Construction Bank digital currency ATM
E-cash is a technology of simulating cash in electronic form. But it is more convenient and economical than real money. Its simplest form includes three main bodies: business, user and bank
the full name of e-cash is electronic cash. Also known as e-money or digital cash, it is a very important electronic payment system. It can be regarded as the electronic or digital simulation of real money. E-cash exists in the form of digital information and circulates through the Internet
E-cash plays the same role as ordinary cash in the economic field, which is very important to the normal economic operation. E-cash should have the following properties:(1) system independence: the use of e-cash has nothing to do with the computer system
(2) non repeated spending: e-cash can only be used once, and repeated spending can be easily detected(3) anonymity: banks and businesses collude and cannot track the use of e-cash
(4) unforgeability: users can't make counterfeit money, including two situations: first, users can't make effective e-cash out of thin air; Second, after the user withdraws n effective e-cash from the bank, he can't create effective e-cash according to the information of extracting and paying the N e-cash
(5) transitivity: users can lend e-cash to others like ordinary cash, and can't be tracked
(6) separability: e-cash can make any amount of payment