Method and apparatus for updating an information state

摘要

A computer system comprising a first and second computer entity having program-accessible information; wherein the second computer entity is arranged to modify the second computer entity's program-accessible information in accordance with a received change to the first computer entity's program-accessible information if the second computer entity determines that the received change to the first computer entities program-accessible information complies with a first predetermined criteria and irrefutably establishes that the received change is associated with the first computer entity.