Method and device for accessing a service

A method for accessing a service, with a device comprising data storing means, wherein the method comprises the following steps:

• receiving, by the device, data;
• getting, by the device, based upon the received data, transaction data;
• signing, by the device, the transaction data by using a private key relating to a transaction processing, a signature operation result being a transaction signature;
• generating, by the device, a transaction analysis result;
• storing, by the device, the transaction data and the transaction signature;
• analyzing, by the device, whether the transaction analysis result is or is not a transaction authorization;
• only if the transaction analysis result is a transaction authorization, getting, by the device, service data based upon the received data;
• sending, by the device, to a first external entity the service data;
• and
• sending, by the device, the transaction data and the transaction signature to either the first external entity or a second external entity.