Method for operating a service application (100, 200.1, 200.2) installed on a mobile terminal (102, 202.1, 202.2) for the utilization of a service, in particular a transport service, comprising: - obtaining, by a receiving module of the service application (100, 200.1, 200.2), at least one usage record, - determining, in a base usage state of the service application (100, 200.1, 200.2), by a verification module of the service application (100, 200.1, 200.2), a verified usage state based on the at least one received usage data set and at least one predetermined verification reference criterion, wherein the base usage state is a system be-in state, and - when a verified usage state has been determined, causing, by a first transmitting module of the service application (100, 200.1, 200.2), transmission by the mobile terminal (102, 202.1, 202.2) of an advertising signal with an advertising message, the advertising message indicating that the service application has determined a verified usage state, - generating, by a generation module of the service application (100, 200.1, 200.2), at least one usage log record during at least the base usage state about the usage of a service, - causing, by a second transmitting module of the service application (100, 200.1, 200.2), a mobile terminal (102, 202.1, 202.2) to transmit a usage log message containing the at least one generated usage log data set to a backend system, - receiving, by at least one receiving module of the backend system, a plurality of usage log messages from a plurality of mobile terminals (102, 202.1, 202.2), - determining, by at least one evaluation module of the backend system, a first trip chain for a first mobile terminal (102, 202.1, 202.2) having a verified usage state based on at least a first usage log message from the first mobile terminal (102, 202.1, 202.2), - determining, by the at least one evaluation module of the backend system, a second trip chain for a second mobile terminal (102, 202.1, 202.2) having a non-verified usage state based on at least a second usage log message of the second mobile terminal (102, 202.1, 202.2) including at least a second usage log record, wherein the generation module of the service application (100, 200.1, 200.2) of the second mobile terminal (102, 202.1, 202.2) generates the at least one second usage log record only after the second mobile terminal (102, 202.1, 202.2) has received at least one advertising message from the first mobile terminal (102, 202.1, 202.2). - obtaining, by a receiving module of the service application (100, 200.1, 200.2), at least one usage record, - determining, in a base usage state of the service application (100, 200.1, 200.2), by a verification module of the service application (100, 200.1, 200.2), a verified usage state based on the at least one received usage data set and at least one predetermined verification reference criterion, wherein the base usage state is a system be-in state, and - when a verified usage state has been determined, causing, by a first transmitting module of the service application (100, 200.1, 200.2), transmission by the mobile terminal (102, 202.1, 202.2) of an advertising signal with an advertising message, the advertising message indicating that the service application has determined a verified usage state, - generating, by a generation module of the service application (100, 200.1, 200.2), at least one usage log record during at least the base usage state about the usage of a service, - causing, by a second transmitting module of the service application (100, 200.1, 200.2), a mobile terminal (102, 202.1, 202.2) to transmit a usage log message containing the at least one generated usage log data set to a backend system, - receiving, by at least one receiving module of the backend system, a plurality of usage log messages from a plurality of mobile terminals (102, 202.1, 202.2), - determining, by at least one evaluation module of the backend system, a first trip chain for a first mobile terminal (102, 202.1, 202.2) having a verified usage state based on at least a first usage log message from the first mobile terminal (102, 202.1, 202.2), - determining, by the at least one evaluation module of the backend system, a second trip chain for a second mobile terminal (102, 202.1, 202.2) having a non-verified usage state based on at least a second usage log message of the second mobile terminal (102, 202.1, 202.2) including at least a second usage log record, wherein the generation module of the service application (100, 200.1, 200.2) of the second mobile terminal (102, 202.1, 202.2) generates the at least one second usage log record only after the second mobile terminal (102, 202.1, 202.2) has received at least one advertising message from the first mobile terminal (102, 202.1, 202.2).