Method for backing up transactions

摘要

The method involves providing a transaction number list with the multi-digit transaction numbers. The transaction numbers are selected from the transaction number list for a transaction. The tested transaction number is formed as transaction-specific transaction numbers corresponding to the parameter and with the help of a transaction data (30) of the transaction. Independent claims are included for the following: (1) a portable data carrier is aligned as transaction number generator of a transaction number list for a method; and (2) a system with a transaction device and the transaction number list.