A server or storage device that stores the entire blockchain and runs Bitcoin client software that checks all transaction data and the blockchain for compliance with the Bitcoin protocol. Online payment options have changed the way companies conduct business with their customers and customers, and today, almost every online order is quick and easy. online-stock-exchange.com - online-stock-exchange.com not only gives regular users the opportunity to buy and sell Bitcoin through their credit cards and bank accounts, but also a dealer service.