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We present a verified JavaCard implementation for the Mondex Verification Challenge. This completes a series of verification… Expand Mondex is a payment system that utilizes smart cards as electronic purses for financial transactions. This paper first reports on… Expand A development of the Mondex system was undertaken using Event-B and its associated proof tools. An incremental approach was used… Expand The Mondex Case study is still the most substantial contribution to the Grand Challenge repository. It has been the target of a… Expand We present results from the second pilot project in the international Verification Grand Challenge: a formally verified… Expand This paper describes the Mondex case study with UML class diagrams and restricting OCL constraints. The constraints have been… Expand The Mondex Case study is still the most substantial contribution to the Grand Challenge repository. It has been the target of a… Expand The Mondex case study about the specification and refinement of an electronic purse as defined in [SCJ00] has recently been… Expand We describe our experiences in mechanising the specification, refinement, and proof of the Mondex Electronic Purse using the Z… Expand Electronic cash systems seek to reengineer cash payments. While the use of cash imposes numerous invisible costs on the economy… Expand