Abstract: A system for converting physical coins into digital currency at a point of sale during a cash transaction at a retailer and related methods. A mobile app residing on a customer's mobile device communicates with a control module to manage the customer's account and obtain an identifier associated with the customer's account. During a cash transaction where physical change is due, the mobile device transmits the identifier to the point of sale. The point of sale transmits the identifier and the amount of change due to the control module. The control module confirms the identity of the customer using the identifier and directs a financial institution to move the amount of change due from the retailer's bank account to one or more designated bank accounts, one of which may be the customer's bank account.

Abstract: A hack-proof computer interface between a public-side operating system and a private-side operating system utilizing a “King's food taster” approach. A public-side operating system is exposed to the outside world, while a private-side operating system is isolated from the outside world except through the hack-proof interface. This effectively prevents infection of the private-side operating system with viruses or other computer malware from the outside world. The hack-proof interface includes a bitmap-coupled interface, such as a camera capturing a video image of the visible computer screen public-side operating system. A security device, such as a video scrambler or security lens, distorts or decimates the video image sufficiently to prevent active virus code from passing through the bitmap-coupled interface.

Abstract: A hack-proof computer interface between a public-side operating system and a private-side operating system utilizing a “King's food taster” approach. A public-side operating system is exposed to the outside world, while a private-side operating system is isolated from the outside world except through the hack-proof interface. This effectively prevents infection of the private-side operating system with viruses or other computer malware from the outside world. The hack-proof interface includes a bitmap-coupled interface, such as a camera capturing a video image of the visible computer screen public-side operating system. A security device, such as a video scrambler or security lens, distorts or decimates the video image sufficiently to prevent active virus code from passing through the bitmap-coupled interface.

Abstract: A system for converting physical coins into digital currency at a point of sale during a cash transaction at a retailer and related methods. A mobile app residing on a customer's mobile device communicates with a control module to manage the customer's account and obtain an identifier associated with the customer's account. During a cash transaction where physical change is due, the mobile device transmits the identifier to the point of sale. The point of sale transmits the identifier and the amount of change due to the control module. The control module confirms the identity of the customer using the identifier and directs a financial institution to move the amount of change due from the retailer's bank account to one or more designated bank accounts, one of which may be the customer's bank account.