In a vane-type camshaft phaser, one vane extends over a much larger internal angle than the other two vanes. A client and a server obtain initial authentication information at the same time, the client generates first one-time temporary authentication information, a conference key and a standby identity identifier according to the initial authentication information, and transmits them to the server, and the server performs a dynamic authentication program. The merchant platform is in electronic data communications with the System platform and the subscriber mobile device is in electronic data communication with the System platform. , the components separate, when the tensile force transferred to the connector exceeds a predetermined level, and may be selectively adjusted to reduce the amount of force required to separate a male and female component of the safety connector. This enables variation in the pupil intensity distribution of the pixel for focusing due to positional production tolerance of components to be suppressed. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.