Abstract: A method for designing and constructing a thin programmable dynamic credential card is disclosed. The thin programmable dynamic credential card may comprise multiple layers, including a top surface layer containing an opening through which a graphical display system below the top surface layer can be viewed. The graphical display system is configured to present at least one coded image. The at least one coded image is determined based at least in part on context data associated with a context of the programmable credential card.

Abstract: Technology is described for providing and using a thermo-sensitive payment card. An example payment card comprises a card substrate and a personalization layer overlaying the card substrate. The personalization layer includes a first region and a second region surrounding the first region. The first region includes an account number associated with an account of a user, and the account of the user is maintained by a payment service system that issues the payment card. At least one of the first region or the second region comprises a thermochromic ink such that application of heat to the first region or the second region having the thermochromic ink causes a change in color of the personalization layer so as to reveal the account number.

Abstract: A method for designing and constructing a thin programmable dynamic credential card is disclosed. The thin programmable dynamic credential card may comprise multiple layers, including a top surface layer containing an opening through which a graphical display system below the top surface layer can be viewed. The graphical display system is configured to present at least one coded image. The at least one coded image is determined based at least in part on context data associated with a context of the programmable credential card.

Abstract: Technology is described for providing and using a thermo-sensitive payment card. An example payment card comprises a card substrate and a personalization layer overlaying the card substrate. The personalization layer includes a first region and a second region surrounding the first region. The first region includes an account number associated with an account of a user, and the account of the user is maintained by a payment service system that issues the payment card. At least one of the first region or the second region comprises a thermochromic ink such that application of heat to the first region or the second region having the thermochromic ink causes a change in color of the personalization layer so as to reveal the account number.

Abstract: A method for designing and constructing a thin programmable dynamic credential card is disclosed. The thin programmable dynamic credential card may comprise multiple layers, including a top surface layer containing an opening through which a graphical display system below the top surface layer can be viewed. The graphical display system is configured to present at least one coded image. The at least one coded image is determined based at least in part on context data associated with a context of the programmable credential card.

Abstract: Technology is described for providing and using a thermo-sensitive payment card. An example payment card comprises a card substrate and a personalization layer overlaying the card substrate. The personalization layer includes a first region and a second region surrounding the first region. The first region includes an account number associated with an account of a user, and the account of the user is maintained by a payment service system that issues the payment card. At least one of the first region or the second region comprises a thermochromic ink such that application of heat to the first region or the second region having the thermochromic ink causes a change in color of the personalization layer so as to reveal the account number.

Abstract: A method for designing and constructing a thin programmable dynamic credential card is disclosed. The thin programmable dynamic credential card may comprise nine different layers carefully constructed to house a battery, a processor, a wireless communication system, a solenoid coil, a graphical display, input buttons, and other electrical components all within the thin form factor of a credit card.

Abstract: Conventional magnetic stripe cards are encoded with static magnetic patterns. To act like many different magnetic stripe cards, a programmable dynamic magnetic stripe card disclosed. The programmable dynamic magnetic stripe card includes a solenoid coil for generating a magnetic field and solenoid coil driver circuitry for driving the solenoid coil to generate a magnetic field. To improve the quality of the magnetic field generated, a biasing magnet is placed adjacent to the solenoid coil.

Abstract: A method for designing and constructing a thin programmable dynamic credential card is disclosed. The thin programmable dynamic credential card may comprise nine different layers carefully constructed to house a battery, a processor, a wireless communication system, a solenoid coil, a graphical display, input buttons, and other electrical components all within the thin form factor of a credit card.

Abstract: A dynamic credential card system for interoperating with multiple different point-of-sale systems is disclosed. The system comprises three computer systems: a dynamic digital value transfer system operating on a server, a dynamic digital value transfer application operating on a mobile digital device, and a small programmable dynamic credential card system. The dynamic digital value transfer system interoperates with third party payment systems and communicates with the dynamic digital value transfer application. The dynamic digital value transfer application communicates with the small programmable dynamic credential card system. The small programmable dynamic credential card system has at least one Point-of-Sale communication system for communicating with retail Point-Of-Sale terminals.

Abstract: Conventional magnetic stripe cards are encoded with static magnetic patterns. To act like many different magnetic stripe cards, a programmable dynamic magnetic stripe card disclosed. The programmable dynamic magnetic stripe card includes a solenoid coil for generating a magnetic field and solenoid coil driver circuitry for driving the solenoid coil to generate a magnetic field. To improve the quality of the magnetic field generated, a biasing magnet is placed adjacent to the solenoid coil.

Abstract: The disclosure presents systems and methods to identify program workings sets, detect working set changes and estimate working set sizes. The system generates a highly compressed representation of the working set, called a working set signature, by hashing working set elements into a data structure and setting the entries touched. The working set signature identifies, or is a representation of, the working set. The system can detect a working set change by comparing the signatures of consecutive working sets using a metric called a relative signature distance. The working set size is estimated by counting the number of bits set in the signature. The system can be used to compactly represent various types of working sets such as instruction, data and branch working sets. The system can detect program working set changes (or phase changes) independent of any micro-architectural specification.

Abstract: The disclosure presents systems and methods to identify program workings sets, detect working set changes and estimate working set sizes. The system generates a highly compressed representation of the working set, called a working set signature, by hashing working set elements into a data structure and setting the entries touched. The working set signature identifies, or is a representation of, the working set. The system can detect a working set change by comparing the signatures of consecutive working sets using a metric called a relative signature distance. The working set size is estimated by counting the number of bits set in the signature. The system can be used to compactly represent various types of working sets such as instruction, data and branch working sets. The system can detect program working set changes (or phase changes) independent of any micro-architectural specification. Thus, the system can be applied to any microprocessor without any modifications.