In order to prevent stamps or indicia from being forged and in order to bill a logistics service between different postal service providers correctly to the user, a computer-implemented method for franking postal articles is implemented. The article's progress is recorded by readers and, together with the accompanying franking identification, is stored in blocks of a blockchain as a transaction. In doing so, the assignment of the readers to a postal service provider is recorded. The logistics service provided is billed correctly to the user by analyzing the transactions stored in the blockchain that are to be allocated to at least one postal service provider.